Assembly type micro pile foundation of power transmission line and construction method

Abstract

The embodiment of the invention relates to the technical field of micro pile foundation engineering, in particular to a power transmission line assembly type micro pile foundation and a construction method. According to one specific implementation mode, the power transmission line assembly type micro pile foundation comprises a middle bearing platform, a first edge bearing platform, a second edge bearing platform, prestressed tendons, an anchorage device assembly, an anchor pad assembly, a first micro pile, a second micro pile, a third micro pile, a fourth micro pile, a first connecting steel cylinder, a second connecting steel cylinder, a third connecting steel cylinder and a fourth connecting steel cylinder. The middle bearing platform is fixedly connected with the first edge bearing platform through prestressed tendons, and the second edge bearing platform is fixedly connected with the second edge bearing platform through prestressed tendons; and the middle bearing platform is fixedly connected with the second edge bearing platform through prestressed tendons. According to the implementation mode, the transportation and installation efficiency of the assembly type micro pile foundation is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of micro pile foundation engineering, and specifically to assembled micro pile foundations for power transmission lines and computer equipment. Background Art

[0002] Cast-in-place pile foundation is a commonly used pile foundation form. Its main technical features include on-site pouring, more wet operations, concrete and steel materials, cast-in-place connections, high ultimate bearing capacity and foundation stiffness. The new assembled micro pile foundation has significant differences in construction methods, materials, connection methods, load transfer, construction efficiency, adaptability, bearing performance and economy, especially its fully mechanized construction and prefabricated component size design, which makes it have obvious advantages in application in complex environments.

[0003] However, it is found in practice that when using cast-in-place pile foundations and the above-mentioned assembled micro-pile foundations, the following technical problems often occur:

[0004] First, although prefabricated foundations have been used, the prefabricated components are large in size and difficult to transport and install;

[0005] Second, the existing connection structure between the cap and the pile is mostly inclined to pre-embedded bolts in concrete and on-site post-casting. Among them, the pre-embedded bolts have problems such as difficult positioning and easy deviation of the pre-embedded bolts, and the on-site post-casting process is a wet operation on site, which is not conducive to short construction period and environmental protection;

[0006] Third, the construction period of cast-in-place micropile foundation is long and the on-site procedures are complicated (for example, during the entire construction process of cast-in-place pile foundation, additional reinforcement cage tying, concrete and steel transportation, concrete pouring and concrete curing are required);

[0007] Fourth, due to the small diameter of micropiles, it is difficult to control the quality of on-site construction. It is easily affected by the construction environment and the level of operators, resulting in unstable pile quality.

[0008] Fifth, the on-site construction of cast-in-place pile foundations will produce a large amount of mud and other waste, causing environmental pollution. Summary of the invention

[0009] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0010] Some embodiments of the present application propose an assembled micro-pile foundation for a power transmission line and a construction method to solve one or more of the technical problems mentioned in the above background technology section.

[0011] In the first aspect, some embodiments of the present application provide a transmission line assembled micropile foundation, including: an intermediate cap, a first edge cap, a second edge cap, prestressed tendons, an anchor assembly, an anchor pad assembly, a first micropile, a second micropile, a third micropile, a fourth micropile, a first connecting steel cylinder, a second connecting steel cylinder, a third connecting steel cylinder, a fourth connecting steel cylinder, a first connecting steel plate, a second connecting steel plate, a third connecting steel plate and a fourth connecting steel plate, wherein the intermediate cap is fixedly connected to the first edge cap by the prestressed tendons; the intermediate cap is fixedly connected to the second edge cap by the prestressed tendons; the prestressed tendons are fixedly connected to the first edge The cap is fixedly connected by the anchor assembly and the anchor pad assembly; the prestressed tendon is fixedly connected to the second edge cap by the anchor assembly and the anchor pad assembly; the first edge cap is fixedly connected to the first micropile by the first connecting steel cylinder and the first connecting steel plate; the first edge cap is fixedly connected to the second micropile by the second connecting steel cylinder and the second connecting steel plate; the second edge cap is fixedly connected to the third micropile by the third connecting steel cylinder and the third connecting steel plate; the second edge cap is fixedly connected to the fourth micropile by the fourth connecting steel cylinder and the fourth connecting steel plate.

[0012] Optionally, the intermediate support platform includes: a main column, an intermediate support platform prestressed pipe, a first keyway and a second keyway, wherein the main column is pre-embedded with connecting bolts; the main column is fixedly connected to the footboard by connecting bolts; the intermediate support platform prestressed pipe is used for the passage of prestressed tendons; the first keyway is used to fix the first edge support platform; the second keyway is used to fix the second edge support platform.

[0013] Optionally, the first edge cap comprises: a first pile installation reserved hole, a second pile installation reserved hole, a first edge cap prestressed pipe and a first shear key, wherein the first pile installation reserved hole is used to install a first micropile, wherein the diameter of the first pile installation reserved hole is larger than the diameter of the first micropile, and the gap between the first pile installation reserved hole and the first micropile is tightly connected by grouting; the second pile installation reserved hole is used to install a second micropile, wherein the diameter of the second pile installation reserved hole is larger than the diameter of the second micropile, and the gap between the second pile installation reserved hole and the second micropile is tightly connected by grouting; the first edge cap prestressed pipe is used for the penetration of prestressed tendons; the first edge cap is fixedly mounted on the first keyway included in the intermediate cap through the first shear key.

[0014] Optionally, the second edge cap comprises: a third pile installation reserved hole, a fourth pile installation reserved hole, a second edge cap prestressed pipe and a second shear key, wherein the third pile installation reserved hole is used to install a third micropile, wherein the diameter of the third pile installation reserved hole is larger than the diameter of the third micropile, and the gap between the third pile installation reserved hole and the third micropile is tightly connected by grouting; the fourth pile installation reserved hole is used to install a fourth micropile, wherein the diameter of the fourth pile installation reserved hole is larger than the diameter of the fourth micropile, and the gap between the fourth pile installation reserved hole and the fourth micropile is tightly connected by grouting; the second edge cap prestressed pipe is used for the threading of prestressed tendons; the second edge cap is fixedly mounted on the second keyway included in the middle cap through the second shear key.

[0015] Optionally, the first connecting steel cylinder includes: an upper flange plate of a first connecting steel cylinder, a lower flange plate of a first connecting steel cylinder, a web plate of a first connecting steel cylinder, a first bolt and a first anchoring steel bar, wherein the web plate of the first connecting steel cylinder is used to provide a reserved hole for installing a first pile; the first bolt is welded to the web plate of the first connecting steel cylinder on both sides; the first bolt is connected to the upper flange plate of the first connecting steel cylinder by plug welding; the first bolt is connected to the lower flange plate of the first connecting steel cylinder by plug welding; the first anchoring steel bar is used to embed the first connecting steel cylinder in the first edge cap; the upper flange plate of the first connecting steel cylinder is used to provide a flat construction platform when the first connecting steel plate is connected, and to provide lateral stiffness and strength of the first connecting steel cylinder; the lower flange plate of the first connecting steel cylinder is used to provide lateral stiffness and strength of the first connecting steel cylinder.

[0016] Optionally, the first micropile comprises: a first micropile embedded bolt and a first pile end, wherein the first micropile is fixedly connected to the first connecting steel plate by the first micropile embedded bolt included in the first micropile; the first pile end comprises: an anchor bar for the first pile head embedded bolt and a bottom end; the first micropile embedded bolt is fixed in the first micropile by the anchor bar for the first pile head embedded bolt included in the first pile end.

[0017] In a second aspect, some embodiments of the present application also provide a construction method for an assembled micro pile foundation for a power transmission line, the method comprising: locating the foundation construction position to obtain a positioning point; brushing glue on the joint surface of the intermediate cap and the first edge cap; brushing glue on the joint surface of the intermediate cap and the second edge cap; leveling the site at the construction site; applying a thin layer of grouting material on the surface of the leveled site; in response to determining that the grouting material is not dry, using a small pile hoist to hoist the intermediate cap, the first edge cap and the second edge cap to the positioning point, so that the first shear key included in the first edge cap is reliably connected to the first keyway of the intermediate cap. contact, and make the second shear key included in the second edge cap reliably contact with the second keyway of the middle cap; pass the prestressed tendon from the first edge cap prestressed pipe included in the first edge cap, pass through the middle cap, and pass out from the second edge cap prestressed pipe included in the second edge cap; apply prestress to the prestressed tendon by a prestressed pump; anchor the prestressed tendon by an anchor assembly and an anchor pad assembly; install a first micropile in the first edge cap; install a second micropile in the first edge cap; install a third micropile in the second edge cap; install a fourth micropile in the second edge cap.

[0018] The above-mentioned various embodiments of the present application have the following beneficial effects: through the transmission line assembled micro pile foundation of some embodiments of the present application, the efficiency of transportation and installation of the assembled micro pile foundation can be improved. Specifically, the reason for the reduced efficiency of transportation and installation of the assembled micro pile foundation is that although the assembled foundation has been applied, the prefabricated components are large in size and difficult to transport and install. Based on this, the transmission line assembled micro pile foundation of some embodiments of the present application includes: an intermediate cap, a first edge cap, a second edge cap, a prestressed tendon, an anchor assembly, an anchor pad assembly, a first micro pile, a second micro pile, a third micro pile, a fourth micro pile, a first connecting steel cylinder, a second connecting steel cylinder, a third connecting steel cylinder, a fourth connecting steel cylinder, a first connecting steel plate, a second connecting steel plate, a third connecting steel plate and a fourth connecting steel plate. As a result, some transmission line assembled micro pile foundations of the present application can adopt full mechanical connection, without on-site wet operation, significantly shortening the construction period and improving construction efficiency. The prefabricated components are produced in the factory, and the quality control is more strict and reliable, avoiding the uncertainty of on-site construction and ensuring the quality of piles. The bolts and pile holes of the prefabricated products are precisely positioned, and the finished products are of high quality. No wet work is required on site, which significantly reduces the pollution to the environment during construction and is beneficial to environmental protection requirements. The use of miniaturized design and lightweight construction equipment improves the safety of construction, especially in complex environmental conditions such as narrow spaces, slopes, and mountainous areas. The miniaturized block design of the foundation components is convenient for transportation and on-site installation, which adapts to the development trend of fully mechanized construction of power transmission line projects. The assembled micro pile foundation has good bearing performance under vertical and horizontal load conditions, clear load transfer path, reasonable force distribution, strong adaptability and structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0020] Figure 1 It is a structural schematic diagram of some embodiments of the assembled micro pile foundation of the power transmission line according to the present application;

[0021] Figure 2 are front views of some embodiments of assembled micropile foundations for power transmission lines according to the present application;

[0022] Figure 3 is a side view of some embodiments of the assembled micropile foundation for power transmission lines according to the present application;

[0023] Figure 4It is a structural schematic diagram of the intermediate cap of some embodiments of the assembled micro pile foundation of the power transmission line according to the present application;

[0024] Figure 5 is a front view of an intermediate cap according to some embodiments of the assembled micropile foundation for power transmission lines of the present application;

[0025] Figure 6 is a side view of an intermediate cap according to some embodiments of the assembled micropile foundation for power transmission lines of the present application;

[0026] Figure 7 is a structural schematic diagram of a first edge cap of some embodiments of a transmission line assembled micropile foundation according to the present application;

[0027] Figure 8 is a front view of a first edge cap according to some embodiments of the transmission line assembled micropile foundation of the present application;

[0028] Fig. 9 is a side view of a first edge cap of some embodiments of the assembled micropile foundation for power transmission lines according to the present application;

[0029] Fig.10 is a schematic structural diagram of a first connecting steel cylinder according to some embodiments of a transmission line assembled micropile foundation of the present application;

[0030] Fig.11 is a top view of a first connection steel cylinder according to some embodiments of the assembled micropile foundation for power transmission lines of the present application;

[0031] Fig.12 is a cross-sectional view of a first connecting steel cylinder according to some embodiments of the assembled micropile foundation for power transmission lines of the present application;

[0032] Fig.13 is a schematic structural diagram of a first micropile according to some embodiments of a transmission line assembled micropile foundation of the present application;

[0033] Fig.14 is a schematic structural diagram of anchor bars for pre-embedded bolts of a first micropile of some embodiments of a transmission line assembled micropile foundation of the present application;

[0034] Fig.15 is a schematic structural diagram of the bottom end of a first micropile according to some embodiments of the assembled micropile foundation for power transmission lines of the present application;

[0035] Fig.16 It is a flow chart of some embodiments of the construction method for assembled micro pile foundation of power transmission line according to the present application.

[0036] In the figure, the middle cap 1, the main column 1.1, the middle cap prestressed pipe 1.2, the first keyway 1.3, the second keyway 1.4; the first edge cap 2, the first pile installation reserved hole 2.1, the first edge cap prestressed pipe 2.2, the first shear key 2.3; the first connecting steel cylinder 3, the first connecting steel cylinder upper flange plate 3.1, the first connecting steel cylinder lower flange plate 3.2, the first connecting steel cylinder web 3.3, the first bolt 3.4, the first anchor steel bar 3.5; the first micro pile 4, the first micro pile embedded bolt 4.1, first pile end 4.2, anchor bar for first embedded bolt 4.1.1, pointed bottom end 4.2.1, flat bottom end 4.2.2, cross-shaped end 4.2.3; prestressed tendon 5; anchor assembly 6; anchor pad assembly 7; first connecting steel plate 8; second edge cap 9; second micro pile 10; third micro pile 11; fourth micro pile 12; second connecting steel cylinder 13; third connecting steel cylinder 14; fourth connecting steel cylinder 15; second connecting steel plate 16; third connecting steel plate 17; fourth connecting steel plate 18. DETAILED DESCRIPTION

[0037] Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0038] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0039] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0040] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0041] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0042] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] Figure 1 The schematic diagrams of the structures of some embodiments of the assembled micro pile foundation for power transmission lines according to the present application are shown. Figure 1 As shown, the assembled micro pile foundation for power transmission line comprises: an intermediate cap 1, a first edge cap 2, a second edge cap 9, a prestressed tendon 5, an anchor assembly 6, an anchor pad assembly 7, a first micro pile 4, a second micro pile 10, a third micro pile 11, a fourth micro pile 12, a first connecting steel cylinder 3, a second connecting steel cylinder 13, a third connecting steel cylinder 14, a fourth connecting steel cylinder 15, a first connecting steel plate 8, a second connecting steel plate 16, a third connecting steel plate 17 and a fourth connecting steel plate 18. The intermediate cap 1 and the first edge cap 2 can be fixedly connected by the prestressed tendon 5.

[0044] For details, please refer to Figure 2-Figure 3 The transmission line assembled micro pile foundation is further described. Figure 2 The front views of some embodiments of assembled micro pile foundations for power transmission lines according to the present application are shown. Figure 3 Figure 2 shows side views of some embodiments of assembled micro pile foundations for power transmission lines according to the present application. Figure 1-Figure 3 As shown, the middle support 1 and the second edge support 9 are fixedly connected via the prestressed tendons 5 .

[0045] The prestressed tendon 5 and the first edge cap 2 can be fixedly connected through the anchor assembly 6 and the anchor pad assembly 7 .

[0046] The prestressed tendon 5 and the second edge cap 2 can be fixedly connected through the anchor assembly 6 and the anchor pad assembly 7 .

[0047] The first edge cap 2 and the first micropile 4 may be fixedly connected via the first connecting steel cylinder 3 and the first connecting steel plate 8 .

[0048] The first edge cap 2 and the second micropile 10 may be fixedly connected via the second connecting steel cylinder 13 and the second connecting steel plate 16 .

[0049] The second edge cap 9 and the third micropile 11 may be fixedly connected via the third connecting steel cylinder 14 and the third connecting steel plate 17;

[0050] The second edge cap 9 and the fourth micropile 12 may be fixedly connected via the fourth connecting steel cylinder 15 and the fourth connecting steel plate 18 .

[0051] Therefore, the present invention proposes a new type of assembled micro pile foundation, in which the foundation connection method adopts full mechanical connection, and the construction of micro piles adopts static pressure pile construction technology, without on-site wet work. The cap is designed in small and equal weight blocks, which is convenient for transportation and on-site installation. The mechanical connection method of prestressed tendons and bolts is adopted for splicing, which improves the construction quality and efficiency.

[0052] Optionally, you can refer to Figure 4-Figure 6 The intermediate cap 1 included in the assembled micro pile foundation for transmission lines is further described. Figure 4 A schematic structural diagram of an intermediate cap 1 of some embodiments of a transmission line assembled micropile foundation according to the present application is shown. Figure 5 A front view of an intermediate cap 1 of some embodiments of a transmission line assembled micropile foundation according to the present application is shown. Figure 6 FIG. 1 shows a side view of an intermediate cap 1 of some embodiments of the assembled micropile foundation for power transmission lines according to the present application. Figure 4-Figure 6 As shown, the intermediate pedestal 1 may include: a main column 1.1, an intermediate pedestal prestressed pipe 1.2, a first keyway 1.3 and a second keyway 1.4, wherein the main column 1.1 is pre-buried with connecting bolts. The main column 1.1 may be fixedly connected to the footboard by connecting bolts. The intermediate pedestal prestressed pipe 1.2 may be used for passing the prestressed tendons 5. The first keyway 1.3 may be used for fixing the first edge pedestal 2. The second keyway 1.4 may be used for fixing the second edge pedestal 9. Here, the connecting bolt may be a bolt for connecting the footboard. The footboard may be a footboard of a scaffolding used for aerial work.

[0053] Optionally, you can refer to Figure 7-Figure 9 The first edge cap 2 included in the transmission line assembled micropile foundation is further described. Figure 7 A schematic structural diagram of a first edge cap 2 of some embodiments of a transmission line assembled micropile foundation according to the present application is shown. Figure 8 A front view of a first edge cap 2 of some embodiments of a transmission line assembled micropile foundation according to the present application is shown. Fig. 9 FIG. 2 shows a side view of a first edge cap 2 of some embodiments of the assembled micropile foundation for power transmission lines according to the present application. Figure 7-Figure 9As shown, the first edge cap 2 may include: a first pile installation reserved hole 2.1, a second pile installation reserved hole 2.4, a first edge cap prestressed pipe 2.2 and a first shear key 2.3, wherein the first pile installation reserved hole 2.1 may be used to install the first micropile 4. The diameter of the first pile installation reserved hole 2.1 may be greater than the diameter of the first micropile 4, and the gap between the first pile installation reserved hole 2.1 and the first micropile 4 may be connected tightly by grouting. The second pile installation reserved hole 2.4 may be used to install the second micropile 10. The diameter of the second pile installation reserved hole 2.4 may be greater than the diameter of the second micropile 10, and the gap between the second pile installation reserved hole 2.4 and the second micropile 10 may be connected tightly by grouting. The first edge cap prestressed pipe 2.2 may be used for the pipe threading of the prestressed tendon 5. The first edge cap 2 may be fixedly mounted on the first keyway 1.3 included in the intermediate cap 1 by the first shear key 2.3.

[0054] Optionally, the second edge cap 9 may include: a third pile installation reserved hole 9.1, a fourth pile installation reserved hole 9.4, a second edge cap prestressed pipe 9.2 and a second shear key 9.3. The third pile installation reserved hole 9.1 may be used to install a third micropile 11. The diameter of the third pile installation reserved hole 9.1 may be greater than the diameter of the third micropile 11, and the gap between the third pile installation reserved hole 9.1 and the third micropile 11 may be densely connected by grouting. The fourth pile installation reserved hole 9.4 may be used to install a fourth micropile 12. The diameter of the fourth pile installation reserved hole 9.4 may be greater than the diameter of the fourth micropile 12, and the gap between the fourth pile installation reserved hole 9.4 and the fourth micropile 12 may be densely connected by grouting. The second edge cap prestressed pipe 9.2 may be used for the pipe threading of the prestressed tendon 5. The second edge cap 9 may be fixedly mounted on the second keyway 1.4 included in the intermediate cap 1 by the second shear key 9.3. Here, the specific structure of the second edge support platform 9 and the technical effects it brings can refer to the first edge support platform 2 in the above embodiment, and will not be repeated here.

[0055] Optionally, you can refer to Figure 10-12 The first connecting steel cylinder 3 included in the transmission line assembled micro pile foundation is further described. Fig.10 A schematic structural diagram of the first connecting steel cylinder 3 of some embodiments of the assembled micro pile foundation for power transmission lines according to the present application is shown. Fig.11 A top view of the first connecting steel cylinder 3 of some embodiments of the assembled micro pile foundation for power transmission lines according to the present application is shown. Fig.12FIG. 2 shows a cross-sectional view of the first connecting steel cylinder 3 of some embodiments of the assembled micropile foundation for power transmission lines according to the present application. Figure 10-12 As shown, the first connecting steel cylinder 3 may include: a first connecting steel cylinder upper flange plate 3.1, a first connecting steel cylinder lower flange plate 3.2, a first connecting steel cylinder web plate 3.3, a first bolt 3.4 and a first anchoring steel bar 3.5. Among them, the first connecting steel cylinder web plate 3.3 may be used to provide a first pile installation reserved hole 2.1. The first bolt 3.4 and the first connecting steel cylinder web plate 3.3 may be double-sided welded. The first bolt 3.4 and the first connecting steel cylinder upper flange plate 3.1 may be plug-welded. The first bolt 3.4 and the first connecting steel cylinder lower flange plate 3.2 may be plug-welded. The first anchoring steel bar 3.5 may be used to embed the first connecting steel cylinder 3 in the first edge cap 2. The first connecting steel cylinder upper flange plate 3.1 may be used to provide a flat construction platform when the first connecting steel plate 8 is connected, and to provide the lateral stiffness and strength of the first connecting steel cylinder 3. The first connecting steel cylinder lower flange plate 3.2 may be used to provide the lateral stiffness and strength of the first connecting steel cylinder 3.

[0056] Specifically, the specific structure of the second connecting steel cylinder 13 and the technical effects brought about by it can refer to the first connecting steel cylinder 3 in the above embodiment, the specific structure of the third connecting steel cylinder 14 and the technical effects brought about by it can refer to the first connecting steel cylinder 3 in the above embodiment, and the specific structure of the fourth connecting steel cylinder 15 and the technical effects brought about by it can refer to the first connecting steel cylinder 3 in the above embodiment, and they will not be repeated here.

[0057] Therefore, the height of the connecting steel cylinder designed by the present invention is consistent with the thickness of the pedestal, and the structure is simple and easy to manufacture. At the same time, when the pedestal is prefabricated, it can serve as a template and a force-bearing connection piece between the pedestal and the pile, and the positioning is relatively convenient.

[0058] Optionally, you can refer to Figure 13-Figure 15 The first micropile 4 included in the transmission line assembled micropile foundation is further described. Fig.13 A schematic structural diagram of a first micropile 4 according to some embodiments of the assembled micropile foundation for power transmission lines of the present application is shown.

[0059] Fig.14 A schematic structural diagram of the first micropile pre-embedded bolt anchor bar 4.1.1 of some embodiments of the transmission line assembled micropile foundation according to the present application is shown. Fig.15 FIG. 4 is a schematic diagram showing the structure of the bottom end of the first micropile 4 of some embodiments of the assembled micropile foundation for power transmission lines according to the present application. Figure 13-Figure 15As shown, the first micropile 4 may include: a first micropile embedded bolt 4.1 and a first pile end 4.2. The first micropile 4 may be fixedly connected to the first connecting steel plate 8 by the first micropile embedded bolt 4.1 included in the first micropile 4. The first pile end 4.2 may include: an anchor bar 4.1.1 for the first pile head embedded bolt and a bottom end. The first micropile embedded bolt 4.1 is fixed in the first micropile 4 by the first pile head embedded bolt anchor bar 4.1.1 included in the first pile end 4.2. Here, the bottom end may be but is not limited to at least one of the following: a pointed bottom end 4.2.1, a flat bottom end 4.2.2 or a cross-shaped end 4.2.3.

[0060] Specifically, the pointed end 4.2.1 can reduce the resistance of the micropile when it is pressed into the soil, and is mainly used for pile pressing in hard soil or soil containing stones. The flat end 4.2.2 is suitable for pile pressing in soft soil and medium-hard soil. The cross-shaped end 4.2.3 can reduce the resistance of pile pressing and improve the bearing capacity of the pile end.

[0061] Here, the specific structure of the second micropile 10 and the technical effects it brings can refer to the first micropile 4 in the above embodiment, the specific structure of the third micropile 11 and the technical effects it brings can refer to the first micropile 4 in the above embodiment, and the specific structure of the fourth micropile 12 and the technical effects it brings can refer to the first micropile 4 in the above embodiment, and they will not be repeated here.

[0062] The above-mentioned various embodiments of the present application have the following beneficial effects: through the transmission line assembled micro pile foundation of some embodiments of the present application, the efficiency of transportation and installation of the assembled micro pile foundation can be improved. Specifically, the reason for the reduced efficiency of transportation and installation of the assembled micro pile foundation is that although the assembled foundation has been applied, the prefabricated components are large in size and difficult to transport and install. Based on this, the transmission line assembled micro pile foundation of some embodiments of the present application includes: an intermediate cap, a first edge cap, a second edge cap, a prestressed tendon, an anchor assembly, an anchor pad assembly, a first micro pile, a second micro pile, a third micro pile, a fourth micro pile, a first connecting steel cylinder, a second connecting steel cylinder, a third connecting steel cylinder, a fourth connecting steel cylinder, a first connecting steel plate, a second connecting steel plate, a third connecting steel plate and a fourth connecting steel plate. As a result, some transmission line assembled micro pile foundations of the present application can adopt full mechanical connection, without on-site wet operation, significantly shortening the construction period and improving construction efficiency. The prefabricated components are produced in the factory, and the quality control is more strict and reliable, avoiding the uncertainty of on-site construction and ensuring the quality of piles. The bolts and pile holes of the prefabricated products are precisely positioned, and the finished products are of high quality. No wet work is required on site, which significantly reduces the pollution to the environment during construction and is beneficial to environmental protection requirements. The use of miniaturized design and lightweight construction equipment improves the safety of construction, especially in complex environmental conditions such as narrow spaces, slopes, and mountainous areas. The miniaturized block design of the foundation components is convenient for transportation and on-site installation, which adapts to the development trend of fully mechanized construction of power transmission line projects. The assembled micro pile foundation has good bearing performance under vertical and horizontal load conditions, clear load transfer path, reasonable force distribution, strong adaptability and structural stability.

[0063] Fig.16 1600 is a flowchart showing some embodiments of the construction method for the assembled micro pile foundation of the power transmission line according to the present application. Fig.16 As shown, the construction method for the assembled micro pile foundation of the power transmission line is applied to some embodiments of the assembled micro pile foundation of the power transmission line, including:

[0064] Step 1601, locate the foundation construction position to obtain a positioning point.

[0065] In some embodiments, the execution subject of the construction method for the assembled micro pile foundation of the power transmission line can locate the foundation construction position to obtain the positioning point. The foundation construction position can be located by a preset positioning method to obtain the positioning point.

[0066] As an example, the above-mentioned preset positioning method may be an engineering measurement positioning method.

[0067] Step 1602, brushing glue on the joint surface of the middle support and the first edge support.

[0068] In some embodiments, the execution body may apply glue to the joint surface of the middle platform and the first edge platform. Glue may be applied to the joint surface of the middle platform and the first edge platform.

[0069] Step 1603, brush glue on the joint surface of the middle support and the second edge support.

[0070] In some embodiments, the execution body may apply glue to the joint surface between the middle platform and the second edge platform. Glue may be applied to the joint surface between the middle platform and the second edge platform.

[0071] Step 1604, leveling the construction site.

[0072] In some embodiments, the execution entity may perform leveling on the construction site, wherein leveling equipment may be used to level the construction site.

[0073] As an example, the land-leveling equipment may be, but is not limited to, at least one of the following: a bulldozer or a land-leveling machine.

[0074] Step 1605, apply a thin layer of grouting material on the surface of the leveled site.

[0075] In some embodiments, the execution body may apply a thin layer of grouting material on the surface of the flattened site. In particular, a thin layer of grouting material may be applied on the surface of the flattened site. Thus, the surface of the site may be flattened and the cap may be in good contact with the ground surface.

[0076] Step 1606, in response to determining that the grouting material is not dry, use a small pile driver to lift the middle cap, the first edge cap and the second edge cap to the positioning point, so that the first shear key included in the first edge cap is in reliable contact with the first keyway of the middle cap, and the second shear key included in the second edge cap is in reliable contact with the second keyway of the middle cap.

[0077] In some embodiments, in response to determining that the grouting material is not dry, the execution body can use a small pile hoist to hoist the intermediate cap, the first edge cap and the second edge cap to the positioning point, so that the first shear key included in the first edge cap is in reliable contact with the first keyway of the intermediate cap, and the second shear key included in the second edge cap is in reliable contact with the second keyway of the intermediate cap. Wherein, in response to determining that the grouting material is not dry, the execution body can use a small pile hoist to hoist the intermediate cap, the first edge cap and the second edge cap to the positioning point, so that the first shear key included in the first edge cap is in reliable contact with the first keyway of the intermediate cap, and the second shear key included in the second edge cap is in reliable contact with the second keyway of the intermediate cap.

[0078] Step 1607, passing the prestressed tendons from the first edge cap prestressed pipe included in the first edge cap, through the middle cap, and out from the second edge cap prestressed pipe included in the second edge cap.

[0079] In some embodiments, the execution body may pass the prestressed tendon from the first edge cap prestressed pipe included in the first edge cap, through the middle cap, and out of the second edge cap prestressed pipe included in the second edge cap. The prestressed tendon may pass from the first edge cap prestressed pipe included in the first edge cap, through the middle cap, and out of the second edge cap prestressed pipe included in the second edge cap.

[0080] Optionally, the execution body can also pass the prestressed tendons from the second edge cap prestressed pipe included in the second edge cap, through the middle cap, and out from the first edge cap prestressed pipe included in the first edge cap.

[0081] Step 1608, applying prestress to the prestressed tendons by means of a prestressed pump.

[0082] In some embodiments, the execution body may apply prestress to the prestressed tendons through a prestressed pump. Wherein, the prestress may be applied to the prestressed tendons through a prestressed pump.

[0083] Step 1609, anchoring the prestressed tendons by means of an anchor assembly and an anchor pad assembly.

[0084] In some embodiments, the execution body may anchor the prestressed tendons through an anchor assembly and an anchor pad assembly. The prestressed tendons may be anchored through an anchor assembly and an anchor pad assembly.

[0085] Step 1610, installing a first micropile in a first edge cap.

[0086] In some embodiments, the execution entity may install a first micropile in the first edge cap, wherein the first micropile may be a single pile, a two-section pile, or a three-section pile according to the pile length, and the micropile type of the first micropile may be a reinforced concrete pile or a steel pipe pile.

[0087] In some optional implementations of some embodiments, the execution subject installing the first micropile in the first edge cap may include the following steps:

[0088] The first step is to use a pile driving frame to drive the first micro pile in the first pile installation reserved hole included in the first edge cap. The pile driving frame can be fixed by a screw rod of the first edge cap so as to drive the pile in the first pile installation reserved hole. In practice, a small pile driving machine can also be directly used to statically drive the first micro pile. The above-mentioned pile driving method also includes hammering pile driving, not limited to static pile driving.

[0089] The second step is to remove the pile pressing frame in response to determining that the first micropile meets a preset condition, wherein the preset condition may be that the first micropile is pressed to a target position.

[0090] As an example, the target position may be that the first micropile is flush with the top of the first edge cap.

[0091] The third step is to fill the first pile installation reserved hole included in the first edge cap with slightly expanded fine stone concrete.

[0092] The fourth step is to fix the first connecting steel plate to the first bolt included in the first connecting steel cylinder and the first micropile embedded bolt included in the first micropile. The screw on the top surface of the first edge cap can be passed through the corresponding bolt hole on the first connecting steel plate and connected to the nut, and the first connecting steel plate and the first micropile embedded bolt in the first micropile are connected and fixed by the nut, so as to realize the connection and fixation of the micropile and the cap.

[0093] Step 1611, installing a second micropile in the first edge cap.

[0094] In some embodiments, the execution subject may install the second micropile in the first edge cap. The specific implementation method of installing the second micropile in the first edge cap and the technical effect thereof may refer to step 1610 in the above embodiment, which will not be described in detail here. The second micropile may be a single pile, a two-section pile or a three-section pile according to the pile length, and the micropile type of the second micropile may be a reinforced concrete pile or a steel pipe pile.

[0095] Step 1612, installing a third micropile in the second edge cap.

[0096] In some embodiments, the execution subject may install the third micropile in the second edge cap. The specific implementation method of installing the third micropile in the second edge cap and the technical effect thereof may refer to step 1610 in the above embodiment, which will not be described in detail here. The third micropile may be a single pile, a two-section pile or a three-section pile according to the pile length, and the micropile type of the third micropile may be a reinforced concrete pile or a steel pipe pile.

[0097] Step 1613, installing a fourth micropile in the second edge cap.

[0098] In some embodiments, the execution subject may install the fourth micropile in the second edge cap. The specific implementation method of installing the fourth micropile in the second edge cap and the technical effect thereof may refer to step 1610 in the above embodiment, which will not be described in detail here. The fourth micropile may be a single pile, a two-section pile or a three-section pile according to the pile length, and the micropile type of the fourth micropile may be a reinforced concrete pile or a steel pipe pile.

[0099] Therefore, the construction method and process of the prefabricated micropile foundation can adopt full mechanical connection, without on-site wet work, which reduces the construction period and improves construction efficiency.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission line assembled micro pile foundation, characterized in that: include: The intermediate cap, the first edge cap, the second edge cap, the prestressed tendons, the anchor assembly, the anchor pad assembly, the first micropile, the second micropile, the third micropile, the fourth micropile, the first connecting steel cylinder, the second connecting steel cylinder, the third connecting steel cylinder, the fourth connecting steel cylinder, the first connecting steel plate, the second connecting steel plate, the third connecting steel plate and the fourth connecting steel plate, wherein: The intermediate cap is fixedly connected to the first edge cap by the prestressed tendons; The intermediate cap is fixedly connected to the second edge cap by the prestressed tendons; The prestressed tendons are fixedly connected to the first edge cap via the anchor assembly and the anchor pad assembly; The prestressed tendons are fixedly connected to the second edge cap via the anchor assembly and the anchor pad assembly; The first edge cap is fixedly connected to the first micropile via the first connecting steel cylinder and the first connecting steel plate; The first edge cap is fixedly connected to the second micropile via the second connecting steel cylinder and the second connecting steel plate; The second edge cap is fixedly connected to the third micropile via the third connecting steel cylinder and the third connecting steel plate; The second edge cap is fixedly connected to the fourth micropile via the fourth connecting steel cylinder and the fourth connecting steel plate.

2. The assembled micro pile foundation for power transmission lines according to claim 1, characterized in that: The intermediate cap includes: a main column, an intermediate cap prestressed pipe, a first keyway and a second keyway, wherein: Connecting bolts are pre-embedded in the main column; The main column is fixedly connected to the footboard via connecting bolts; The intermediate cap prestressed pipe is used for passing the prestressed tendons; The first keyway is used to fix the first edge support; The second keyway is used to fix the second edge support.

3. The assembled micro pile foundation for power transmission lines according to claim 2, characterized in that: The first edge cap comprises: a first pile installation reserved hole, a second pile installation reserved hole, a first edge cap prestressed pipe and a first shear key, wherein: The first pile installation reserved hole is used to install the first micropile, wherein the diameter of the first pile installation reserved hole is larger than the diameter of the first micropile, and the gap between the first pile installation reserved hole and the first micropile is densely connected by grouting; The second pile installation reserved hole is used to install the second micropile, wherein the diameter of the second pile installation reserved hole is larger than the diameter of the second micropile, and the gap between the second pile installation reserved hole and the second micropile is densely connected by grouting; The first edge cap prestressed pipe is used for passing prestressed tendons; The first edge platform is fixedly mounted on the first keyway included in the middle platform through the first shear key.

4. The assembled micro pile foundation for power transmission lines according to claim 3, characterized in that: The first connecting steel cylinder comprises: a first connecting steel cylinder upper flange plate, a first connecting steel cylinder lower flange plate, a first connecting steel cylinder web plate, a first bolt and a first anchoring steel bar, wherein: The web of the first connecting steel cylinder is used to provide a reserved hole for first pile installation; The first bolt is welded to the web of the first connecting steel cylinder on both sides; The first bolt is plug-welded to the upper flange plate of the first connecting steel cylinder; The first bolt is plug-welded to the lower flange plate of the first connecting steel cylinder; The first anchoring steel bar is used to embed the first connecting steel cylinder in the first edge cap; The upper flange plate of the first connecting steel cylinder is used to provide a flat construction platform when the first connecting steel plate is connected, and to provide the lateral rigidity and strength of the first connecting steel cylinder; The lower flange plate of the first connecting steel cylinder is used to provide lateral rigidity and strength of the first connecting steel cylinder.

5. A construction method for a transmission line assembled micropile foundation, applied to the transmission line assembled micropile foundation as described in any one of claims 1 to 4, comprising: Locate the foundation construction position to obtain the positioning point; Apply glue to the joint surface of the middle cap and the first edge cap; Apply glue to the joint surface of the middle platform and the second edge platform; Level the site at the construction site; Apply a thin layer of grouting material on the surface of the leveled site; In response to determining that the grouting material is not dry, using a small pile hoist to hoist the middle cap, the first edge cap and the second edge cap to a positioning point, so that a first shear key included in the first edge cap is in reliable contact with a first keyway of the middle cap, and a second shear key included in the second edge cap is in reliable contact with a second keyway of the middle cap; Passing the prestressed tendons from the first edge cap prestressed pipe included in the first edge cap, through the middle cap, and out from the second edge cap prestressed pipe included in the second edge cap; Applying prestress to the prestressed tendons by means of a prestressed pump; Anchoring the prestressed tendons by means of an anchor assembly and an anchor pad assembly; installing a first micropile in the first edge cap; installing a second micropile in the first edge cap; installing a third micropile in the second edge cap; A fourth micropile is installed in the second edge cap.

6. The assembled micro pile foundation for power transmission lines according to claim 5, characterized in that: Installing a first micropile in the first edge cap includes: The first micro pile is pressed into the first pile installation reserved hole included in the first edge cap by using a pile pressing frame; In response to determining that the first micropile meets a preset condition, removing the pile driving frame; Filling the first pile installation reserved hole included in the first edge cap with slightly expanded fine stone concrete; The first connecting steel plate is fixedly connected to the first bolt included in the first connecting steel cylinder and the first micropile embedded bolt included in the first micropile respectively.

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