Integrated grounding structure for caissons

Abstract

This invention discloses an integrated grounding structure for caissons. The caisson walls, frame columns, frame beams, and internal partition walls are interconnected by internal steel bars to form natural grounding electrodes, and then cast in concrete to form an integral frame structure. A ring of caisson cutting edges is provided at the lower end of the caisson walls. The steel bars inside the caisson walls are connected to the cutting edge steel bars inside the cutting edges. Grounding steel shoes are provided at the lower ends of both the cutting edges and the internal partition walls. These grounding steel shoes are connected by welding to form an artificial grounding grid. The grounding steel shoes are connected to the cutting edge steel bars or the corresponding internal partition wall steel bars by multiple lead-in steel bars. These lead-in steel bars are perpendicularly and crosswise connected to the steel bars of the corresponding cutting edges or the steel bars of the corresponding internal partition walls near the lower end. This invention enables the construction of the grounding grid for the caisson structure without excavation of the foundation trench and without secondary assembly of the grounding equipment, solving the problem of burying grounding electrodes under the existing caisson bottom slab.

Description

Technical Field

[0001] This invention relates to the field of underground building / structure construction technology, and in particular to an integrated grounding structure for caissons. Background Technology

[0002] Caisson construction is a mature and highly adaptable construction technique applicable to various engineering fields, such as foundations of large buildings (or structures), underground water treatment plants, hydraulic tunnels, new retaining structures, and underground railway stations. In recent years, however, the continuous expansion of the application areas of caisson construction has also brought about new engineering and technical challenges.

[0003] The purpose of an integrated grounding system is to protect the safety of operators and passengers, protect equipment from electric shock and electrical interference, and form a unified grounding system that is compatible with both high and low voltage and combines strong and weak currents, meeting the working grounding, safety grounding, and lightning protection grounding functions of various equipment. The steel mesh of the main building structure can form a complete natural grounding electrode. When the natural grounding electrode cannot meet the grounding resistance requirements or when the building has a power station, substation, or other similar facilities, an artificial grounding electrode must be installed.

[0004] Therefore, in existing technologies, the pre-embedding of artificial grounding electrodes in open-cut or top-cut reverse construction involves excavating a foundation trench below the base slab and burying horizontal and vertical grounding electrodes, and connecting the natural grounding electrode and the artificial grounding electrode by introducing the grounding lead-in into the structure. However, when caisson structures are used in projects that require artificial grounding electrodes, it is difficult to achieve horizontal and vertical connectivity in the foundation trench excavation at the bottom of the caisson pit due to the limitations of the internal partition walls; and for caissons that require underwater sealing, it is even more difficult to meet the conditions for underwater excavation of the foundation trench inside the caisson.

[0005] To address the aforementioned challenges, existing technologies can employ methods such as excavating a foundation trench under the inner partition wall of the caisson, or manually lowering an artificial grounding grid around the inner partition wall in space and then reassembling it in the caisson. However, these methods still suffer from problems such as high engineering risks, low construction efficiency, and high material costs.

[0006] Therefore, how to achieve the construction of the grounding grid for the caisson structure without excavation of the foundation trench and without secondary assembly of the grounding equipment, and solve the problem of burying the grounding electrode under the existing caisson bottom plate, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of the above-mentioned deficiencies of the prior art, the present invention provides an integrated grounding structure for caissons, the purpose of which is to realize the construction of the grounding grid for caisson structures without excavation of the foundation trench and the elimination of secondary assembly of grounding equipment, thereby solving the problem of burying grounding electrodes under the existing caisson bottom plate.

[0008] To achieve the above objectives, the present invention discloses an integrated grounding structure for caissons, including caisson walls, frame columns, frame beams, and internal partition walls; the caisson walls, frame columns, frame beams, and internal partition walls are all reinforced concrete structures, and natural grounding electrodes are formed by connecting the internal steel bars, and concrete is poured to form an integral frame structure.

[0009] At the lower end of the frame structure, a ring of caisson cutting edges is provided at the position corresponding to the lower end of the caisson wall;

[0010] The reinforcing bars inside the caisson wall are connected to the cutting edge reinforcing bars inside the caisson cutting edge;

[0011] The lower end of the cutting edge of the caisson and the lower end of the inner partition wall of the caisson are both equipped with grounding steel shoes.

[0012] The lower end of the cutting edge of the caisson and the lower end of the grounding steel shoe of the inner partition wall of the caisson are connected by welding to form an artificial grounding grid;

[0013] The grounding steel shoe is a strip structure with a "V" shaped cross-section. The inner cavity formed by the upward opening matches the lower part of the corresponding caisson cutting edge or the lower part of the corresponding caisson inner partition wall. It is snapped into the lower part of the corresponding caisson cutting edge or the lower end of the corresponding caisson inner partition wall, and is connected to the cutting edge steel bar or the partition wall steel bar in the corresponding caisson inner partition wall by multiple lead steel bars.

[0014] Multiple lead-in reinforcing bars are perpendicularly connected to the reinforcing bars of the corresponding caisson cutting edge, or to the reinforcing bars of the corresponding inner partition wall of the caisson near the lower end. Preferably, the grounding steel shoe is made of galvanized steel or copper.

[0015] Preferably, each of the lead reinforcing bars and the corresponding cutting edge reinforcing bars, or the corresponding partition wall reinforcing bars, are perpendicularly intersected and fixedly connected by welding to form a weld with a height of not less than 6mm.

[0016] Preferably, the caisson wall, the inner partition wall of the caisson, and the side of the frame column located inside the caisson are all provided with multiple equipotential pre-embedded terminals that are connected to the steel bars at corresponding positions.

[0017] Preferably, a caisson bottom plate is provided at the upper end of the caisson cutting edge, where it connects with the caisson wall; and plain concrete is provided below the caisson bottom plate.

[0018] The beneficial effects of this invention are:

[0019] This invention enables the construction of grounding grid for caisson structures without excavation of the foundation trench and without secondary assembly of grounding equipment, solving the problem of burying grounding electrodes under the existing caisson bottom plate.

[0020] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0021] Figure 1 The diagram shows a top view of the structure according to an embodiment of the present invention.

[0022] Figure 2 This diagram illustrates a structure with a caisson cutting edge at the lower end in one embodiment of the present invention.

[0023] Figure 3 This diagram shows a partially enlarged view of the connection between the cutting edge of the caisson and the inner partition wall of the caisson in one embodiment of the present invention.

[0024] Figure 4 This diagram illustrates a structural schematic of welding a lead-in steel bar to a corresponding cutting edge steel bar or a corresponding partition wall steel bar in one embodiment of the present invention.

[0025] Figure 5 This diagram illustrates a structure in which the inner partition wall of the caisson is provided with equipotential pre-embedded terminals, according to an embodiment of the present invention. Detailed Implementation

[0026] Example

[0027] like Figures 1 to 3 As shown, the integrated grounding structure of the caisson includes the caisson wall 1, frame columns 6, frame beams and internal partition walls 2. The caisson wall 1, frame columns 6, frame beams and internal partition walls 2 are all reinforced concrete structures. The internal steel bars are connected to each other to form a natural grounding electrode, and concrete is poured to form an integral frame structure.

[0028] Among them, at the lower end of the frame structure, a ring of caisson cutting feet 5 is provided at the position corresponding to the lower end of the caisson wall 1;

[0029] The reinforcing bars inside the caisson wall 1 are connected to the cutting edge reinforcing bars 9 inside the caisson cutting edge 5;

[0030] Grounding steel shoes 3 are provided at the lower end of the caisson cutting foot 5 and the lower end of the inner partition wall 2 of the caisson.

[0031] The lower end of the caisson cutting foot 5 and the lower end of the grounding steel shoe 3 of the inner partition wall 2 of the caisson are connected by welding to form an artificial grounding grid;

[0032] The grounding steel shoe 3 is a strip structure with a "V" shaped cross section. The inner cavity formed by the upward opening matches the lower part of the corresponding caisson cutting foot 5 or the lower part of the corresponding caisson inner partition wall 2. It is snapped into the lower part of the corresponding caisson cutting foot 5 or the lower part of the corresponding caisson inner partition wall 2. It is connected to the cutting foot steel bar 9 or the partition wall steel bar 10 in the corresponding caisson inner partition wall 2 by multiple connecting steel bars 11.

[0033] Multiple lead-in steel bars 11 are perpendicularly connected to the steel bars of the corresponding caisson cutting edge 5, or the steel bars of the corresponding caisson inner partition wall 2 near the lower end.

[0034] The present invention, through the above-described structure, interconnects the reinforcing steel bars inside the caisson wall 1, frame column 6, frame beam, and inner partition wall 2 to form a natural grounding electrode. The lower end of the caisson cutting edge 5 and the grounding steel shoe 3 at the lower end of the inner partition wall 2 are connected by welding to form an artificial grounding grid as an artificial grounding electrode.

[0035] The grounding steel shoe 3, which serves as an artificial grounding electrode, is vertically and crosswise connected to the reinforcing bars 11 of the corresponding caisson cutting foot 5 or the reinforcing bars of the corresponding caisson inner partition wall 2 near the lower end, so as to realize the connection between the natural grounding electrode and the artificial grounding electrode, thereby forming a comprehensive grounding system that can meet the grounding requirements of internal electromechanical equipment.

[0036] In practical applications, the caisson relies on its own weight or a sinking system to sink. During the sinking process, the caisson cutting edge 5 directly bears the lateral water and soil pressure and the soil end resistance. Due to the special structure of the caisson cutting edge 5, stress concentration is easily caused. The presence of the grounding steel shoe 3 can effectively prevent the caisson cutting edge 5 from being damaged by local pressure.

[0037] At the same time, the grounding steel shoe 3 is used as the grounding electrode to fully explore the dual value of the grounding steel shoe 3 in the sinking stage and the operation stage, save engineering resources, and improve the economic efficiency of the project.

[0038] The reinforcing bar 11 forms a grounding grid on the cross section of the corresponding grounding steel shoe 3. After the caisson sinks, the construction trench for the grounding grid of the caisson structure is excavated without excavation and the grounding equipment is reassembled, solving the problem of burying the grounding electrode under the existing caisson bottom plate.

[0039] In some embodiments, the grounding steel shoe 3 is made of galvanized steel or copper.

[0040] like Figure 4 As shown, in some embodiments, each lead reinforcing bar 11 is perpendicularly intersected with the corresponding cutting edge reinforcing bar 9 or the corresponding partition wall reinforcing bar 10, and is fixedly connected by welding to form a weld 12 with a height of not less than 6mm.

[0041] like Figure 5As shown, in some embodiments, the caisson wall 1, the caisson inner partition wall 2, and the frame column 6 are all provided with multiple equipotential pre-embedded terminals 13 connected to the corresponding steel bars on the sides inside the caisson.

[0042] In practical applications, the installation of equipotential pre-embedded terminals 13 facilitates the grounding of electromechanical equipment inside the caisson.

[0043] In some embodiments, a caisson bottom plate 4 is provided at the upper end of the caisson cutting edge 5, where it connects with the caisson wall 1; a plain concrete bottom seal 8 is provided below the caisson bottom plate 4.

[0044] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A caisson integrated grounding structure, comprising a caisson wall (1), frame columns (6), frame beams, and an inner partition wall (2); wherein the caisson wall (1), the frame columns (6), the frame beams, and the inner partition wall (2) are all reinforced concrete structures, forming a natural grounding electrode by connecting the internal steel bars, and then pouring concrete to form an integral frame structure; characterized in that, At the lower end of the frame structure, a ring of caisson cutting edge (5) is provided at the position corresponding to the lower end of the caisson wall (1). The reinforcing bars inside the caisson wall (1) are connected to the cutting edge reinforcing bars (9) inside the caisson cutting edge (5); The lower end of the caisson cutting edge (5) and the lower end of the caisson inner partition wall (2) are both provided with grounding steel shoes (3). The lower end of the caisson cutting edge (5) and the lower end of the grounding steel shoe (3) of the inner partition wall (2) of the caisson are connected by welding to form an artificial grounding grid; The grounding steel shoe (3) is a strip structure with a "V" shaped cross section. The inner cavity formed by the upward opening matches the lower part of the corresponding caisson cutting foot (5) or the lower part of the corresponding caisson inner partition wall (2). It is snapped into the lower part of the corresponding caisson cutting foot (5) or the lower part of the corresponding caisson inner partition wall (2). It is connected to the cutting foot steel bar (9) or the partition wall steel bar (10) in the corresponding caisson inner partition wall (2) by multiple lead steel bars (11). Multiple of the lead-in steel bars (11) are perpendicularly connected to the steel bars of the corresponding caisson cutting edge (5) or the steel bars of the corresponding caisson inner partition wall (2) near the lower end. The grounding steel boot (3) is made of galvanized steel or copper. Each of the aforementioned lead-in steel bars (11) and the corresponding cutting foot steel bars (9), or the corresponding partition wall steel bars (10), are perpendicularly intersected and fixedly connected by welding to form a weld (12) with a height of not less than 6mm. The caisson wall (1), the caisson inner partition wall (2), and the frame column (6) located inside the caisson are all provided with multiple equipotential pre-embedded terminals (13) that are connected to the steel bars at the corresponding positions.

2. The integrated grounding structure for caissons according to claim 1, characterized in that, The upper end of the caisson cutting edge (5) is provided with a caisson bottom plate (4) at the position where it connects with the caisson wall (1); the bottom of the caisson bottom plate (4) is provided with plain concrete sealing (8).

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