Grounding structure convenient for ground polishing and mounting method thereof

Abstract

The invention relates to the technical field of grounding, in particular to a grounding structure facilitating ground polishing and an installation method thereof. Comprising a grounding pre-embedded device and a grounding lead-out device, and the grounding pre-embedded device comprises a first pipe body, a second pipe body and an anti-mortar shin pad; the first sleeve abuts against the top of the mortar-proof shin pad, and the inner wall of the first sleeve comprises a smooth surface section and an internal thread section; the grounding lead-out device comprises a second sleeve, a circular pressing plate and a cover plate which are sequentially arranged from bottom to top and are connected; the second sleeve is positioned in the first sleeve and is in threaded connection with the internal thread section of the first sleeve; the grounding terminal is connected to the circular pressing plate through a terminal fixing seat; and the grounding terminal is connected with a grounding outgoing line arranged in the second pipe body in a penetrating manner through a connecting copper pipe. According to the technical scheme, the grounding structure does not affect the polishing operation of the cast-in-place polishing layer, meanwhile, the top of the grounding structure is completely flush with the ground, and potential safety hazards are avoided while attractiveness is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of grounding technology, and more specifically to a grounding structure and its installation method that facilitates grinding the ground. Background Technology

[0002] Currently, large-scale scientific research buildings, medical buildings, and factories typically require grounding structures to facilitate rapid connection between equipment and grounding wires. Traditional grounding structures often expose the grounding conductors to the outside of the building. This not only fails to adequately protect the grounding points, causing inconvenience for subsequent equipment grounding, but also poses a tripping hazard for pedestrians and affects aesthetics. In some high-standard buildings, the floor requires a polishing layer before grinding. During construction, it was found that directly embedded grounding structures exposed to the ground severely interfered with workers' normal grinding operations, making the grinding process difficult. Especially in large-scale scientific research or medical buildings, where research and medical equipment have high electromagnetic compatibility requirements, a grounding structure that facilitates floor grinding is urgently needed to ensure that the grounding points are close to the equipment and meet the equipment's requirements for floor flatness. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned drawbacks and provide a grounding structure that facilitates grinding the ground. This structure does not affect the grinding operation of the cast-in-place grinding layer, and at the same time, it can make the top of the grounding structure completely flush with the ground, ensuring aesthetics while avoiding safety hazards.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: It includes a grounding pre-embedded device and a grounding lead-out device. The grounding pre-embedded device includes a first pipe body, a second pipe body partially inserted into the first pipe body, and a mortar-resistant pad disposed on the top of the second pipe body. It also includes a first sleeve abutting against the top of the mortar-resistant pad. The inner wall of the first sleeve includes a smooth section and an internally threaded section. The smooth section is located above the internally threaded section and is a polished section. The first sleeve and the mortar-resistant pad are connected by circumferentially arranged positioning rods and fixed to the concrete base layer. The first pipe body is pre-embedded in the concrete base layer, and the top of the first pipe body is higher than or flush with the surface of the concrete base layer. The portion of the second pipe body outside the first pipe body, the mortar-resistant pad, and the first sleeve are all located within the cast-in-place polished concrete layer. The grounding lead-out device includes a second sleeve, a circular pressure plate, and a cover plate arranged sequentially from bottom to top and connected together. The second sleeve is located inside the first sleeve and is threadedly connected to the internal thread section of the first sleeve. It also includes a grounding terminal connected to the circular pressure plate through a terminal fixing seat. The grounding terminal is connected to a grounding lead-out wire passing through the second tube through a connecting copper tube.

[0005] The second tube is an integrally formed stepped tube, including a first tube segment inserted into the first tube and a second tube segment located outside the first tube. The diameter of the second tube segment is larger than that of the first tube segment, and the stepped surface formed by the first tube segment and the second tube segment abuts against the top of the first tube.

[0006] The anti-mortar pad includes a round tube that is fitted into the second tube body and a flange that extends horizontally outward from the top of the round tube. The outer diameter of the flange is larger than the outer diameter of the second tube body, and the flange is provided with a through hole that cooperates with the positioning rod.

[0007] A set of mortar plates are symmetrically arranged on the outer wall of the first sleeve. The bottom surface of the mortar plates is flush with the bottom surface of the first sleeve and abuts against the flange of the anti-mortar pad. Three sets of L-shaped positioning rod mounting seats are also evenly distributed along the circumference of the outer wall of the first sleeve. The first sleeve is also provided with a detachable anti-mortar pad, which is used to connect with the first sleeve when pouring the concrete in-situ grinding layer.

[0008] The positioning rod includes a screw section and an expansion bolt section. The expansion bolt section is fixed in the concrete base layer. The screw section passes through the flange of the anti-mortar pad and the positioning rod mounting seat in sequence, and is then fixed to the positioning rod mounting seat by a positioning nut.

[0009] The outer wall of the second sleeve is provided with external threads, and the top of the inner wall of the second sleeve is provided with a pair of connecting lugs horizontally inward. The center of the circular pressure plate is provided with a first through hole for the grounding terminal to pass through. The circular pressure plate is fixed to the connecting lugs and the cover plate by screws respectively.

[0010] The grounding terminal is an integral structure, including an upper end plate and a lower terminal body. A positioning plate is provided between the end plate and the terminal body to connect the two. The connecting copper tube is sleeved on the terminal body. The terminal fixing seat includes a pad, which is connected to the bottom surface of a circular pressure plate by screws. A second through hole is provided in the center of the pad for the terminal body and the positioning plate to pass through. A tube is provided below the pad for the connecting copper tube to pass through. A clamping screw for fixing the connecting copper tube is provided on the tube wall.

[0011] Another object of the present invention is to provide a method for installing a grounding structure that facilitates grinding of the ground, comprising the following sequential steps: S1: Embed the first pipe body and pour the concrete base layer; S2: Install positioning rod; S3: Install the second pipe body and anti-mortar shin guard so that the grounding lead is located inside the second pipe body; S4: Install the first sleeve and anti-mortar baffle; S5: Cast-in-place polished concrete layer; S6: Simultaneously grind the cast-in-place concrete grinding layer, the first sleeve, and the anti-mortar baffle to the ground elevation; S7: Remove the anti-mortar baffle; S8: Install a grounding lead-out device to make the cover plate flush with the ground.

[0012] In S1, the surface of the concrete base layer is lower than or flush with the top surface of the first pipe body; in S3, the height of the second pipe body is selected according to the elevation of the cast-in-place polished concrete layer; in S4, the surface of the anti-mortar baffle is flush with the surface of the first sleeve; in S5, after the cast-in-place polished concrete layer is poured, the top of the first sleeve should be or flush with the elevation of the cast-in-place polished concrete layer, and the top of the threaded section inside the first sleeve should be lower than the elevation of the ground after polishing.

[0013] The S8 step includes the following steps: S8.1: Install the second sleeve and adjust its height position within the first sleeve; S8.2: Connect the circular pressure plate, grounding terminal, and terminal fixing base into a whole; S8.3: Connect the grounding terminal to the grounding lead; S8.4: Connect the circular pressure plate and the connecting ear plate; S8.5: Install the cover plate.

[0014] The beneficial effects of this invention are as follows: (1) The present invention uses a positioning rod to position the first sleeve, which facilitates the pouring of the concrete cast-in-place grinding layer.

[0015] (2) The upper section of the first sleeve of the present invention is a grinding section. When grinding the ground, it can directly grind the cast-in-place concrete grinding layer and the grinding section at the top of the first sleeve, so that the grinding process is smooth and will not affect the grinding operation; and after grinding, the surface of the grounding pre-embedded device is completely flush with the ground.

[0016] (3) The grounding lead-out device of the present invention is threadedly connected to the first sleeve, which can adjust the height of the grounding lead-out device so that the top of the grounding lead-out device can be completely flush with the ground, keeping the ground aesthetically pleasing, avoiding safety hazards caused by the grounding lead-out device protruding from the ground, providing better protection for the grounding terminal, and also facilitating inspection and overall replacement of the grounding components. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention after the first tube body has been removed; Figure 3 yes Figure 2 A schematic diagram of the decomposed structure; Figure 4 yes Figure 2 A sectional view; Figure 5 This is a schematic diagram of the structure of the second tube body and the anti-mortar pad of the present invention; Figure 6 yes Figure 5 A schematic diagram of the decomposed structure; Figure 7 This is a schematic diagram of the structure of the first sleeve of the present invention; Figure 8 This is a schematic diagram of the structure of the anti-mortar baffle of the present invention; Figure 9 This is a schematic diagram of the structure of the second sleeve of the present invention; Figure 10 This is a schematic diagram of the circular pressure plate of the present invention; Figure 11 This is a schematic diagram of the structure of the grounding terminal of the present invention. Figure 1 ; Figure 12 This is a schematic diagram of the structure of the grounding terminal of the present invention. Figure 2 ; Figure 13 This is a schematic diagram of the terminal fixing base of the present invention. Figure 1 ; Figure 14 This is a schematic diagram of the terminal fixing base of the present invention. Figure 2 ; Figure 15 This is a schematic diagram of the connection structure between the grounding terminal and the terminal fixing base of the present invention. Figure 1 ; Figure 16 This is a schematic diagram of the connection structure between the grounding terminal and the terminal fixing base of the present invention. Figure 2 ; Figure 17 This is a schematic diagram of the connection structure of the grounding terminal, terminal fixing seat and second sleeve of the present invention; Figure 18 This is a schematic diagram of the connection structure of the grounding terminal, terminal fixing seat, second sleeve and circular pressure plate of the present invention; Figure 19 This is a schematic diagram of the grounding lead-out device of the present invention. Figure 1 ; Figure 20 This is a schematic diagram of the grounding lead-out device of the present invention. Figure 2 .

[0018] The markings in the above-mentioned figures are as follows: First pipe body 1, Second pipe body 2, First pipe section 21, Second pipe section 22, Anti-mortar pad 3, Round pipe 31, Flanged edge 32, Through hole 33, First sleeve 4, Slurry plate 41, Positioning rod mounting seat 42, Anti-mortar pad 43, Groove 431, Smooth section 44, Internal thread section 45, Positioning rod 5, Screw section 51, Expansion bolt section 52, Positioning nut 53, Second sleeve 6, Connecting ear plate 61, Circular pressure plate 7, First through hole 71, Cover plate 8, Grounding terminal 9, Connecting copper pipe 91, End plate 92, Terminal body 93, Positioning plate 94, Threaded hole 95, Terminal fixing seat 10, Pad plate 101, Second through hole 102, Central circular hole 1021, Positioning groove 1022, Pipe body 103, Clamping screw 104, Concrete base layer 100, Cast-in-place polished concrete layer 200, Grounding lead wire 300. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-4 The diagram illustrates a grounding structure for easy grinding of the ground, comprising a grounding pre-embedded device and a grounding lead-out device. The grounding pre-embedded device includes a first pipe body 1, a second pipe body 2 partially inserted into the first pipe body 1, and an anti-mortar pad 3 disposed on the top of the second pipe body 2, and a first sleeve 4 abutting against the top of the anti-mortar pad 3. The first pipe body 1 is pre-embedded in the concrete base layer 100, and the portion of the second pipe body 2 located outside the first pipe body 1, the anti-mortar pad 3, and the first sleeve 4 are all located within the cast-in-place concrete grinding layer 200.

[0020] The first conduit 1 is a pre-finished PVC conduit, used only for the protective grounding lead-out wire 300. When pre-embedding the first conduit 1, the top of the first conduit 1 should be higher than or flush with the surface of the concrete base layer 100. The concrete base layer 100 here includes, but is not limited to, one or more of the following: foundation, subbase, waterproof layer, structural layer, and leveling layer. It can be selected according to the actual construction. In this embodiment, the concrete base layer 100 can be understood as the structure below the cast-in-place polished concrete layer 200.

[0021] like Figure 5 , Figure 6 As shown, the second pipe body 2 is an integrally formed stepped pipe body, including a first pipe section 21 inserted into the first pipe body 1 and a second pipe section 22 located outside the first pipe body 1. The diameter of the second pipe section 22 is larger than that of the first pipe section 21, and the stepped surface formed by the first pipe section 21 and the second pipe section 22 abuts against the top of the first pipe body 1. When installing the second pipe body 2, the corresponding size can be selected according to the concrete cast-in-place grinding layer 200 at different elevations. In the production process, only a few specifications of the second pipe body 2 need to be produced to adapt to concrete cast-in-place grinding layers 200 at different elevations, which improves the versatility of the grounding pre-embedded device.

[0022] The anti-mortar pad 3 includes a circular tube 31 that fits inside the second pipe body 2 and a flange 32 that extends horizontally outward from the top of the circular tube 31. The outer diameter of the flange 32 is larger than the outer diameter of the second pipe body 2, and the flange 32 is provided with a through hole 33 that mates with the positioning rod 5. The anti-mortar pad 3 can improve the sealing between the second pipe body 2 and the first sleeve 4, and minimize the intrusion of concrete from between the second pipe body 2 and the first sleeve 4 when pouring the cast-in-place polished concrete layer 200.

[0023] like Figure 7 As shown, the inner wall of the first sleeve 4 includes a smooth section 44 and an internally threaded section 45. The smooth section 44 is located above the internally threaded section 45 and is a grinding section. That is, the inner wall of the first sleeve 4 is composed of the upper smooth section 44 and the lower internally threaded section 45. The smooth section 44 is a grinding section. When grinding the ground, the cast-in-place concrete grinding layer 200 and the smooth section 44 can be ground directly, making the grinding process smooth and ensuring that the top of the grounding pre-embedded device is completely flush with the ground after grinding. The height of the smooth section 44 can be set as needed. Generally, the height of the smooth section 44 does not need to be set too long. In this embodiment, the height of the smooth section 44 is set to 15mm. A set of mortar plates 41 are symmetrically arranged on the outer wall of the first sleeve 4. The bottom surface of the mortar plates 41 is flush with the bottom surface of the first sleeve 4 and abuts against the flange 32 of the anti-mortar pad 3. Another function of the mortar plates 41 is to make the bond between the first sleeve 4 and the cast-in-place polished concrete layer 200 more secure. Three sets of L-shaped positioning rod mounting seats 42 are also evenly distributed along the circumference of the outer wall of the first sleeve 4.

[0024] The first sleeve 4 and the anti-mortar pad 3 are connected and fixed to the concrete base 100 by circumferentially arranged positioning rods 5. Specifically, the positioning rod 5 includes a screw section 51 and an expansion bolt section 52. The expansion bolt section 52 is fixed inside the concrete base 100. The screw section 51 passes through the flange 32 of the anti-mortar pad 3 and the positioning rod mounting seat 42 in sequence, and is then fixed to the positioning rod mounting seat 42 by positioning nuts 53. In this embodiment, three sets of positioning rods 5 are evenly arranged along the circumference of the second pipe 2. During installation, the expansion bolt section 52 of the positioning rod 5 is first driven into the concrete base 100, and then the second pipe 2, the anti-mortar pad 3, and the first sleeve 4 are installed, so that the through hole 33 and the waist-shaped hole of the positioning rod mounting seat 42 pass through the screw section 51 of the positioning rod 5, and are locked by the positioning nuts 53 above and below the positioning rod mounting seat 42 to achieve the positioning of the first sleeve 4, thereby ensuring the stability of the first sleeve 4 during the pouring of the cast-in-place grinding layer 200.

[0025] like Figure 8As shown, the first sleeve 4 is also equipped with a detachable anti-mortar pad 43, which is used to connect with the first sleeve 4 when pouring the cast-in-place polished concrete layer 200. Specifically, the internal thread section 45 on the inner wall of the first sleeve 4 can be used to install the grounding lead-out device or the anti-mortar pad 43. After installing the first sleeve 4, the cast-in-place polished concrete layer 200 needs to be poured. To prevent concrete from entering from the top of the first sleeve 4 during pouring, the anti-mortar pad 43 is installed inside the first sleeve 4 before pouring. After pouring and polishing, the anti-mortar pad 43 is removed, and the grounding lead-out device is installed. In this embodiment, the anti-mortar pad 43 has a groove 431 at its center, facilitating rotation for installation and removal.

[0026] like Figure 19 , Figure 20 As shown, the grounding lead-out device includes a second sleeve 6, a circular pressure plate 7, and a cover plate 8 arranged sequentially from bottom to top and connected together. The outer wall of the second sleeve 6 is provided with external threads. The second sleeve 6 is located inside the first sleeve 4 and is threadedly connected to the internal thread section 45 of the first sleeve 4. Figure 9 As shown, a pair of connecting lugs 61 are horizontally provided at the top of the inner wall of the second sleeve 6, as... Figure 10 As shown, the circular pressure plate 7 has a first through hole 71 at the center for the grounding terminal 9 to pass through. The circular pressure plate 7 is fixed to the connecting ear plate 61 and the cover plate 8 by screws.

[0027] The grounding lead-out device also includes a grounding terminal 9 connected to the circular pressure plate 7 via a terminal fixing seat 10. The grounding terminal 9 is connected to a grounding lead-out wire 300 passing through the second tube 2 via a connecting copper tube 91. In this embodiment, the grounding lead-out wire 300 is made of a flexible conductor and is spirally coiled, allowing it to be stretched when connecting the grounding terminal 9. Specifically, as shown... Figure 11 , Figure 12 As shown, the grounding terminal 9 is an integral structure, including an upper end plate 92 and a lower terminal body 93. A positioning plate 94 connects the end plate 92 and the terminal body 93. A connecting copper tube 91 is sleeved on the terminal body 93. The surface of the grounding terminal 9 has a threaded hole 95, which is used to connect with a crimping bolt to fix the grounding terminal of the equipment. When the grounding lead-out device is not being grounded, it is not necessary to install the crimping bolt. In this case, the threaded hole 95 is protected by a cover plate. The grounding terminal 9 is an existing structure, using an ERICO DB16A grounding terminal.

[0028] like Figure 13 , Figure 14As shown, the terminal fixing base 10 includes a pad 101, which is connected to the bottom surface of the circular pressure plate 7 by screws. A second through hole 102 is provided at the center of the pad 101 for the terminal body 93 and the positioning plate 94 to pass through. The second through hole 102 consists of a central circular hole 1021 that mates with the terminal body 93 and a positioning groove 1022 that mates with the positioning plate 94. The engagement of the positioning hole 94 and the positioning groove prevents the grounding terminal 9 from rotating. Below the pad 101 is a tube body 103 for the copper tube 91 to pass through. A clamping screw 104 for fixing the copper tube 91 is provided on the wall of the tube body 103. Figures 15-18 As shown, the diameter of the end plate 92 is larger than the diameter of the terminal body 93. The terminal body 93 passes through the central circular hole 1021 and the rear end plate 92 presses against the pad 101. The circular pressure plate 7 presses against the end plate 92, and the circular pressure plate 7 is connected and fixed to the pad 101 to fix the grounding terminal 9. During installation, the circular pressure plate 7, the terminal fixing seat 10, and the grounding terminal 9 can be assembled into a whole for installation.

[0029] The present invention also provides a method for installing a grounding structure that facilitates grinding the ground, the method comprising the following sequential steps: S1: Embed the first pipe body and pour the concrete base layer; S2: Install positioning rod; S3: Install the second pipe body and anti-mortar shin guard so that the grounding lead is located inside the second pipe body; S4: Install the first sleeve and anti-mortar baffle; S5: Cast-in-place polished concrete layer; S6: Simultaneously grind the cast-in-place concrete grinding layer, the first sleeve, and the anti-mortar baffle to the ground elevation; S7: Remove the anti-mortar baffle; S8: Install a grounding lead-out device to make the cover plate flush with the ground.

[0030] Specifically, in S1, the surface of the concrete base layer is lower than or flush with the top surface of the first pipe; in S3, the height of the second pipe is selected according to the elevation of the cast-in-place polished concrete layer; in S4, the surface of the anti-mortar baffle is flush with the surface of the first sleeve; in S5, after the cast-in-place polished concrete layer is poured, the top of the first sleeve should be or flush with the elevation of the cast-in-place polished concrete layer, and the top of the threaded section inside the first sleeve should be lower than the elevation of the ground after polishing.

[0031] Specifically, S8 includes the following steps: S8.1: Install the second sleeve and adjust its height position within the first sleeve; S8.2: Connect the circular pressure plate, grounding terminal, and terminal mounting base into a single unit; S8.3: Connect the grounding terminal to the grounding lead; S8.4: Connect the circular pressure plate and the connecting ear plate; S8.5: Install the cover plate.

[0032] The specific installation method for the grounding structure is as follows: First, the first pipe body is pre-embedded, and then a concrete base is poured. The surface of the poured concrete base is lower than or flush with the top surface of the first pipe body.

[0033] Secondly, install the positioning rod by installing the expansion bolt section of the positioning rod inside the concrete base.

[0034] Next, select a second pipe of the appropriate size based on the elevation of the cast-in-place polished concrete layer. Insert the second pipe into the first pipe, ensuring the trapezoidal surface of the second pipe abuts against the top of the first pipe, while simultaneously positioning the grounding lead inside the second pipe. Then, install the anti-mortar shin guard, ensuring the through-hole on the flange of the anti-mortar shin guard fits onto the positioning rod. In actual installation, it is feasible to either first install the second pipe onto the first pipe and then install the anti-mortar shin guard, or to first install the anti-mortar shin guard and the second pipe as a single unit and then install it onto the first pipe.

[0035] Fourth, install the first sleeve, so that the oblong hole on the positioning rod mounting seat of the first sleeve fits onto the positioning rod, and lock it with the positioning nut; then install the anti-mortar baffle, so that the anti-mortar baffle is flush with the surface of the first sleeve.

[0036] Fifth, pour the cast-in-place concrete grinding layer. After the cast-in-place concrete grinding layer is poured, the top of the first sleeve should be higher than or level with the elevation of the cast-in-place concrete grinding layer, and the top of the inner thread section of the first sleeve should be lower than the elevation of the ground after grinding.

[0037] Sixth, after the concrete cast-in-place grinding layer is poured, the concrete cast-in-place grinding layer, the first sleeve and the anti-mortar baffle are ground according to the ground elevation.

[0038] Seventh, after grinding, remove the anti-mortar baffle.

[0039] Finally, install the grounding lead-out device so that the cover plate is flush with the ground. Specifically, this includes: first, screwing the second sleeve into the first sleeve and adjusting the height of the second sleeve within the first sleeve; then connecting the circular pressure plate, grounding terminal, and terminal fixing seat into a whole; then connecting the grounding lead-out wire to the connecting copper pipe; then connecting the circular pressure plate, grounding terminal, and terminal fixing seat into the connecting ear plate of the second sleeve; and finally installing the cover plate.

[0040] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A grounding structure that facilitates grinding the ground, characterized in that: The device includes a grounding pre-embedded device and a grounding lead-out device. The grounding pre-embedded device includes a first pipe body (1), a second pipe body (2) partially inserted into the first pipe body (1), and a mortar-proof pad (3) set on the top of the second pipe body (2). It also includes a first sleeve (4) abutting against the top of the mortar-proof pad (3). The inner wall of the first sleeve (4) includes a smooth section (44) and an internal thread section (45). The smooth section (44) is located above the internal thread section (45) and the smooth section (44) is polished. In the first section, the first sleeve (4) and the anti-mortar pad (3) are connected by a circumferentially arranged positioning rod (5) and fixed to the concrete base layer (100); the first pipe (1) is embedded in the concrete base layer (100), and the top of the first pipe (1) is higher than or flush with the surface of the concrete base layer (100); the second pipe (2) is located outside the first pipe (1), the anti-mortar pad (3) and the first sleeve (4) are all located in the cast-in-place polished concrete layer (200); The grounding lead-out device includes a second sleeve (6), a circular pressure plate (7) and a cover plate (8) arranged and connected sequentially from bottom to top. The second sleeve (6) is located inside the first sleeve (4) and is threadedly connected to the internal thread section (45) of the first sleeve (4). It also includes a grounding terminal (9) connected to the circular pressure plate (7) through a terminal fixing seat (10). The grounding terminal (9) is connected to the grounding lead-out wire (300) passing through the second tube body (2) through a connecting copper tube (91).

2. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: The second tube (2) is an integrally formed stepped tube, including a first tube segment (21) inserted into the first tube (1) and a second tube segment (22) located outside the first tube (1). The diameter of the second tube segment (22) is larger than that of the first tube segment (21), and the stepped surface formed by the first tube segment (21) and the second tube segment (22) abuts against the top of the first tube (1).

3. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: The anti-mortar pad (3) includes a round tube (31) that is fitted into the second tube body (2) and a flange (32) that extends horizontally outward from the top of the round tube (31). The outer diameter of the flange (32) is larger than the outer diameter of the second tube body (2), and the flange (32) is provided with a through hole (33) that cooperates with the positioning rod (5).

4. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: A set of mortar plates (41) are symmetrically arranged on the outer wall of the first sleeve (4). The bottom surface of the mortar plates (41) is flush with the bottom surface of the first sleeve (4) and abuts against the flange (32) of the anti-mortar pad (3). Three sets of L-shaped positioning rod mounting seats (42) are also evenly distributed along the circumference of the outer wall of the first sleeve (4). A detachable anti-mortar pad (43) is also provided inside the first sleeve (4) to cooperate with the first sleeve (4) when pouring the concrete cast-in-place grinding layer (200).

5. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: The positioning rod (5) includes a screw section (51) and an expansion bolt section (52). The expansion bolt section (52) is fixed in the concrete base layer (100). The screw section (51) passes through the flange (32) of the anti-mortar pad (3) and the positioning rod mounting seat (42) in sequence, and is then fixed to the positioning rod mounting seat (42) by the positioning nut (53).

6. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: The outer wall of the second sleeve (6) is provided with external threads, and the top of the inner wall of the second sleeve (6) is provided with a pair of connecting ear plates (61) horizontally inward. The center of the circular pressure plate (7) is provided with a first through hole (71) for the grounding terminal (9) to pass through. The circular pressure plate (7) is fixed to the connecting ear plate (61) and the cover plate (8) by screws respectively.

7. The grounding structure for easy grinding of the ground according to claim 1, characterized in that: The grounding terminal (9) is an integral structure, including an upper end plate (92) and a lower terminal body (93). A positioning plate (94) is provided between the end plate (92) and the terminal body (93) to connect the two. The connecting copper tube (91) is sleeved on the terminal body (93). The terminal fixing seat (10) includes a pad (101). The pad (101) is connected to the bottom surface of the circular pressure plate (7) by screws. A second through hole (102) is opened at the center of the pad (101) for the terminal body (93) and the positioning plate (94) to pass through. A tube body (103) is provided below the pad (101) for the connecting copper tube (91) to pass through. A clamping screw (104) for fixing the connecting copper tube (91) is provided on the tube wall of the tube body (103).

8. A method for installing a grounding structure that facilitates grinding the ground according to any one of claims 1 to 7, characterized in that: The method includes the following steps in sequence: S1: Embed the first pipe body and pour the concrete base layer; S2: Install positioning rod; S3: Install the second pipe body and anti-mortar shin guard so that the grounding lead is located inside the second pipe body; S4: Install the first sleeve and anti-mortar baffle; S5: Cast-in-place polished concrete layer; S6: Simultaneously grind the cast-in-place concrete grinding layer, the first sleeve, and the anti-mortar baffle to the ground elevation; S7: Remove the anti-mortar baffle; S8: Install a grounding lead-out device to make the cover plate flush with the ground.

9. The installation method of the grounding structure for easy grinding of the ground according to claim 8, characterized in that: In S1, the surface of the concrete base layer is lower than or flush with the top surface of the first pipe body; in S3, the height of the second pipe body is selected according to the elevation of the cast-in-place polished concrete layer; in S4, the surface of the anti-mortar baffle is flush with the surface of the first sleeve; in S5, after the cast-in-place polished concrete layer is poured, the top of the first sleeve should be or flush with the elevation of the cast-in-place polished concrete layer, and the top of the threaded section inside the first sleeve should be lower than the elevation of the ground after polishing.

10. The installation method of the grounding structure for easy grinding of the ground according to claim 8, characterized in that: The S8 step includes the following steps: S8.1: Install the second sleeve and adjust its height position within the first sleeve; S8.2: Connect the circular pressure plate, grounding terminal, and terminal mounting base into a single unit; S8.3: Connect the grounding terminal to the grounding lead; S8.4: Connect the circular pressure plate and the connecting ear plate; S8.5: Install the cover plate.

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