A prefabricated spiral anchor foundation for river network and swamp areas and its construction method

Abstract

This invention belongs to the field of power transmission line foundation technology, and provides a prefabricated spiral anchor foundation for river network and swamp areas and its construction method. The prefabricated spiral anchor foundation for river network and swamp areas includes a reinforced concrete structure, a spiral anchor structure, a tension plate, a bearing plate, shear piles, and a retaining structure. The spiral anchor structure is positioned at a predetermined location in the river network and swamp area. The shear piles are arranged between the spiral anchor structures. The reinforced concrete structure includes anchor bolts, reinforced concrete main columns, and a reinforced concrete foundation. The bearing plate is located at the bottom of the reinforced concrete foundation. The tension plate is located on the upper part of the reinforced concrete foundation. The reinforced concrete foundation covers the exposed portion of the shear piles. The reinforced concrete main columns are located above the reinforced concrete foundation. The anchor bolts are pre-embedded within the reinforced concrete main columns.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line foundation technology, and in particular relates to a prefabricated spiral anchor foundation for river network and swamp areas and its construction method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Spiral anchor foundations can effectively reduce earthwork excavation, construction period, and construction costs. However, spiral anchor foundations have weak bending resistance and low resistance to horizontal forces. In practical engineering, combining spiral anchor foundations with reinforced concrete foundations can fully leverage the advantages of both structures.

[0004] However, for towers with large loads, such as 500kV towers, multiple anchor bases are required when using helical anchor foundations. These anchor bases are typically anchored to a reinforced concrete cap, which is a cast-in-place structure. In river network and marshland areas, dewatering costs are high, and using cast-in-place structures is difficult, time-consuming, and environmentally damaging.

[0005] For river network and swamp areas, cast-in-place pile foundations or slab foundations are generally used. Cast-in-place pile foundations are expensive and generate a large amount of mud during construction, resulting in poor environmental performance. Slab foundations require a large amount of excavation, are also environmentally unfriendly, generally require dewatering during construction, leading to higher construction costs, and have significantly lower uplift bearing capacity than in waterless areas, making them less economical. Summary of the Invention

[0006] To address the technical problems mentioned above, this invention provides a prefabricated spiral anchor foundation and its construction method for river network and swamp areas, which features short construction period, high degree of mechanization, environmental friendliness, and low labor demand.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a prefabricated helical anchor foundation for use in river network and swamp areas.

[0009] A prefabricated helical anchor foundation for river network and swamp areas includes: a reinforced concrete structure, a helical anchor structure, a tension plate, a bearing plate, shear piles, and a retaining structure.

[0010] The spiral anchor structure is positioned at a predetermined location in the river network and swamp area; the shear piles are arranged between the spiral anchor structures; the reinforced concrete structure includes anchor bolts, reinforced concrete main columns, and a reinforced concrete foundation; the bearing plate is located at the bottom of the reinforced concrete foundation; the tension plate is arranged on the upper part of the reinforced concrete foundation, and the lower part of the tension plate is connected to the spiral anchor structure; the reinforced concrete foundation is assembled with the exposed portions of the shear piles; the reinforced concrete main columns are arranged above the reinforced concrete foundation; the anchor bolts are pre-embedded in the reinforced concrete main columns for connecting the superstructure; the retaining structure is arranged on the outside of the reinforced concrete foundation.

[0011] In one implementation, the reinforced concrete foundation has exposed connecting steel bars.

[0012] In one embodiment, the reinforced concrete main column is pre-embedded with a grouting sleeve.

[0013] In one embodiment, both the reinforced concrete main pile and the reinforced concrete main pile cap are precast components.

[0014] As one implementation method, a cushion layer is provided at the bottom of the reinforced concrete foundation.

[0015] In one implementation, the shear pile is a precast component.

[0016] In one embodiment, the spiral anchor structure includes an anchor rod, an anchor plate, and an anchor head, with the anchor head located at the end of the anchor rod and the anchor plate disposed on the anchor rod.

[0017] In one embodiment, the top of the spiral anchor structure is provided with an internal thread; the lower part of the pull-out plate is provided with an external thread, which matches and connects with the internal thread.

[0018] In one implementation, holes are pre-drilled in the reinforced concrete foundation for the insertion of the helical anchor structure and the fixing of the shear piles.

[0019] A second aspect of the present invention provides a construction method for prefabricated spiral anchor foundations in river network and swamp areas.

[0020] A construction method for prefabricated helical anchor foundations used in river network and swamp areas, as described above, includes:

[0021] Position the spiral anchor structure and construct the spiral anchor structure one by one;

[0022] After the spiral anchor structure is completed, shear piles are positioned and driven between the two spiral anchor structures.

[0023] Lay the concrete foundation, install the bearing plate, and level the bottom of the reinforced concrete foundation.

[0024] Lift the reinforced concrete main pile and connect it to the reinforced concrete foundation;

[0025] The pull-out plate and the spiral anchor structure are combined using threaded connections.

[0026] Install the retaining earth structure.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) The foundation of the present invention is located entirely on the ground surface, eliminating the need for excavation of the foundation pit, significantly reducing construction difficulty, avoiding a series of pollution and reducing construction costs; moreover, the fully prefabricated spiral anchor foundation of the present invention can avoid the impact of environmental factors on construction, effectively improving the overall quality of the foundation and ensuring the reliability of the foundation.

[0029] (2) All basic components of the present invention are prefabricated and assembled, avoiding on-site construction operations such as steel bar binding, concrete pouring and concrete curing, which can significantly shorten the construction period. It is particularly suitable for emergency repair projects and overseas projects with tight schedules. The present invention does not require foundation pit excavation, which greatly reduces labor demand, solves the labor shortage problem and significantly reduces labor costs, resulting in significant economic benefits.

[0030] (3) When the foundation of the present invention is located above the ground, the actual height of the tower can be reduced by 2m-3m, which can reduce the tower weight to a certain extent; moreover, the prefabricated spiral anchor foundation of the present invention for river network and swamp areas is detachable and can be reused, which has obvious economic benefits for temporary power transmission line projects.

[0031] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0033] Figure 1 This is a front view of a prefabricated spiral anchor foundation for river network and swamp areas according to an embodiment of the present invention;

[0034] Figure 2 This is a top view of a prefabricated spiral anchor foundation for river network and swamp areas according to an embodiment of the present invention;

[0035] Figure 3 This is an exploded view of a prefabricated spiral anchor foundation for river network and swamp areas according to an embodiment of the present invention;

[0036] Figure 4This is a reinforcement diagram of the main column of a prefabricated spiral anchor foundation for river network and swamp areas according to an embodiment of the present invention.

[0037] In the diagram: A - anchor bolt, B - reinforced concrete main column, C - reinforced concrete foundation, D - shear pile, E - spiral anchor structure, F - tension plate, G - bearing plate, H - surrounding soil structure, 600 - anchor plate, 700 - anchor head, 900 - anchor rod. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a prefabricated spiral anchor foundation for river network and swamp areas, which includes: a reinforced concrete structure, a spiral anchor structure E, an anti-tension plate F, a bearing plate G, an anti-shear pile D, and a surrounding soil structure H.

[0042] Specifically, the spiral anchor structure E is deployed at a designated location in the river network and swamp area.

[0043] like Figure 3 As shown, the spiral anchor structure E includes an anchor rod, an anchor plate, and an anchor head. The anchor head is located at the end of the anchor rod, and the anchor plate is arranged on the anchor rod.

[0044] The spiral anchor structure E has an internal thread at its top; the pull-out plate has an external thread at its bottom, which matches and connects with the internal thread.

[0045] In the specific implementation process, the length of the spiral anchor structure E can be divided into various types, which makes it convenient to select components of different lengths during construction.

[0046] Specifically, the shear piles D are arranged between the helical anchor structures; by driving shear piles into the ground, the overall shear resistance of the piles is improved.

[0047] The reinforced concrete structure includes anchor bolts A, reinforced concrete main columns B, and reinforced concrete foundation C; the bearing plate G is set at the bottom of the reinforced concrete foundation; the tension plate F is arranged on the upper part of the reinforced concrete foundation C, and the lower part of the tension plate F is connected to the helical anchor structure E; the reinforced concrete foundation C is assembled with the exposed part of the shear pile D.

[0048] The bearing plate is used as a support for the bearing platform under downward pressure, thereby bearing part of the downward pressure.

[0049] like Figure 4 As shown, the reinforced concrete main column B is positioned above the reinforced concrete foundation C; the anchor bolt A is embedded in the reinforced concrete main column B and is used to connect to the superstructure.

[0050] The retaining structure (e.g., retaining wall) is located on the outside of the reinforced concrete foundation.

[0051] In this embodiment, the reinforced concrete foundation has exposed connecting steel bars.

[0052] Specifically, the reinforced concrete foundation C has pre-drilled holes for the insertion of the helical anchor structure and the fixing of the shear piles.

[0053] In the specific implementation process, the reinforced concrete main column B is pre-embedded with a grouting sleeve. During the grouting operation, the strength of the grouting material should be at least one grade higher than that of the foundation concrete. High-strength grouting material is preferred, with a strength exceeding 45 MPa after 3 days. Grouting should be performed simultaneously with vibration to ensure the compactness of the grouting area.

[0054] The reinforced concrete main pile B and the reinforced concrete main pile cap C are both precast components. The shear pile is also a precast component.

[0055] In other embodiments, the reinforced concrete main pile B and the reinforced concrete main pile cap C are prefabricated as a whole.

[0056] In some embodiments, a pad layer is provided at the bottom of the reinforced concrete foundation C. This provides a flat ground environment for the foundation.

[0057] The foundation of this project is entirely situated on the ground surface, eliminating the need for excavation, avoiding the challenges of underwater construction, reducing environmental pollution from excavation pits, and saving labor resources. Furthermore, all foundation components can be prefabricated, significantly reducing construction time and minimizing the impact on the environment.

[0058] In river network and marshland areas, floods and other major water events can easily cause erosion, washing away the soil around and under the foundation, posing a safety hazard. This embodiment addresses this problem by incorporating a retaining soil structure. Under uplift conditions, filling the retaining soil structure with soil further enhances the foundation's bearing capacity. Since helical anchor foundations have poor resistance to horizontal forces, this embodiment incorporates shear piles to distribute some of the horizontal load, thereby improving the overall foundation's bearing capacity.

[0059] In one or more embodiments, a construction method employing a prefabricated helical anchor foundation for river network and swamp areas as described above includes:

[0060] Step 1: Locate the spiral anchor structure and construct the spiral anchor structure one by one;

[0061] Step 2: After the spiral anchor structure is completed, position the shear piles and drive the shear piles between the two spiral anchor structures;

[0062] Step 3: Lay the concrete foundation, install the bearing plate, and level the bottom of the reinforced concrete foundation.

[0063] Step 4: Lift the reinforced concrete main pile and connect it to the reinforced concrete foundation;

[0064] Step 5: Assemble the pull-out plate and the spiral anchor structure using threaded connections;

[0065] Step 6: Install the retaining structure.

[0066] This embodiment uses a prefabricated reinforced concrete foundation, and it is a thin foundation;

[0067] In the past, when cast-in-place foundations were used, anchor bolts were anchored into the interior of the reinforced concrete foundation, which was very thick.

[0068] This embodiment achieves this through mechanical connection, resulting in a thinner foundation cap. Furthermore, the construction sequence differs from traditional helical anchor foundations, improving the foundation's reliability and stability.

[0069] The prefabricated spiral anchor foundation of this embodiment for river network and swamp areas eliminates the need for foundation pit excavation, reducing pollution, saving labor, and reducing labor demand. All foundation components are prefabricated in the factory, avoiding on-site rebar tying, concrete pouring, and concrete curing operations. This significantly shortens the construction period, reduces environmental impact, and is particularly suitable for projects with tight schedules and short time requirements. The factory fabrication of reinforced concrete components also effectively improves construction quality, thereby enhancing the reliability and stability of the foundation.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A prefabricated helical anchor foundation for river network and swamp areas, characterized in that, include: Reinforced concrete structures, spiral anchor structures, tension plates, bearing plates, shear piles, and retaining structures; The spiral anchor structure is deployed at a predetermined location in the river network and swamp area; the shear pile is deployed between the spiral anchor structures, and shear piles are driven between the two spiral anchor structures. The spiral anchor structure includes an anchor rod, an anchor plate, and an anchor head. The anchor head is located at the end of the anchor rod, and the anchor plate is arranged on the anchor rod. The top of the spiral anchor structure is provided with an internal thread. The lower part of the pull-out plate is provided with an external thread, which matches and connects with the internal thread. The reinforced concrete structure includes anchor bolts, reinforced concrete main columns, and a reinforced concrete foundation; the bearing plate is located at the bottom of the reinforced concrete foundation; the tension plate is located on the upper part of the reinforced concrete foundation, and the lower part of the tension plate is connected to the helical anchor structure; the reinforced concrete foundation is assembled with the exposed portion of the shear pile; the reinforced concrete main columns are located above the reinforced concrete foundation; the anchor bolts are embedded in the reinforced concrete main columns for connecting the superstructure; and the retaining structure is located on the outside of the reinforced concrete foundation.

2. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, The exposed connecting steel bars of the reinforced concrete foundation.

3. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, The reinforced concrete main column is pre-embedded with a grouting sleeve.

4. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, Both the reinforced concrete main column and the reinforced concrete foundation are precast components.

5. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, A cushion layer is provided at the bottom of the reinforced concrete foundation.

6. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, The shear piles are prefabricated components.

7. The prefabricated helical anchor foundation for river network and swamp areas as described in claim 1, characterized in that, The reinforced concrete foundation has pre-drilled holes for inserting the helical anchor structure and fixing the shear piles.

8. A construction method for a prefabricated helical anchor foundation used in river network and swamp areas as described in any one of claims 1-7, characterized in that, include: Position the spiral anchor structure and construct the spiral anchor structure one by one; After the spiral anchor structure is completed, shear piles are positioned and driven between the two spiral anchor structures. Lay the concrete foundation, install the bearing plate, and level the bottom of the reinforced concrete foundation. Lift the reinforced concrete main column and connect it to the reinforced concrete foundation; The pull-out plate and the spiral anchor structure are combined using threaded connections. Install the retaining earth structure.

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