Grounding resistor transformation method for hardened pavement

Abstract

The invention discloses a ground resistance transformation method for a hardened pavement, and the method comprises the following steps: 1, investigating the field terrain, drilling a hole in the ground by using a hole drilling machine to obtain a plurality of drill holes, burying round steel in the plurality of drill holes, inserting one end of the round steel into the ground, and inserting the other end of the round steel into the ground; a plurality of fixing lines are arranged on the peripheral surface of the round steel at intervals; secondly, the drilled holes are poured with a resistance reducing agent, and the two ends of the round steel are connected with the steel bars; 3, manufacturing a lightning protection downlead, wherein one end of the lightning protection downlead is connected with a downlead of the lightning rod or the lightning arrester, and the other end of the lightning protection downlead is connected with the round steel; by means of the method, the situation that the lightning protection effect is poor due to the fact that the soil resistivity of the hardened pavement is high can be improved.

Description

Technical Field

[0001] The invention belongs to the field of grounding resistance, and in particular relates to a grounding resistance modification method for hardened road surfaces. Background Art

[0002] With the acceleration of urbanization, the construction of power systems and communication systems is increasing, and the requirements for grounding resistance are becoming more and more stringent. Especially on hardened roads, due to the high resistivity of the soil, traditional grounding methods often cannot meet the requirements of modern electrical equipment for grounding resistance. In addition, the soil environment under the hardened road surface is complex and may contain various impurities, which further increases the difficulty of achieving effective grounding.

[0003] The traditional grounding method is usually to bury the grounding electrode directly on the ground surface, or to bury the grounding material directly after drilling a hole in the ground. For example, the invention patent with the publication number CN113839230A provides a graphite lightning protection grounding device for lightning protection grounding, including a protection box, a connecting mechanism is provided in the middle of the bottom surface of the protection box, buffer components are provided on both sides of the connecting mechanism, a winding mechanism is provided on the side of the buffer component away from the connecting mechanism, and an anti-falling component is provided on the left and right side walls of the protection box at the position corresponding to the winding mechanism, and a trigger mechanism is provided on the upper side of the anti-falling component.

[0004] However, these methods are not ideal for hardened roads. For example, burying grounding electrodes directly on the surface may cause the grounding resistance to be too high due to dry soil or the presence of non-conductive materials; and simple drilling and burying also faces the same problem, and may also damage the road structure and affect traffic.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a grounding resistance modification method for hardened road surfaces.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A method for modifying ground resistance of a hardened road surface, the method comprising the following steps:

[0009] Step 1: Survey the terrain on site, use a drilling machine to drill holes, obtain multiple holes, and bury round steel in the multiple holes;

[0010] Step 2: The borehole is poured with a resistance reducing agent, and both ends of the round steel are connected to the steel bars;

[0011] Step 3: Make a lightning protection down conductor, one end of which is connected to the down conductor of the lightning rod or the arrester, and the other end is connected to the round steel.

[0012] Preferably, in step 1, before drilling, the ground surface is cleaned and grooves are cut on the ground using an excavator to form a plurality of mutually parallel buried grooves on the ground, and a plurality of drill holes are arranged at intervals on each buried groove.

[0013] Preferably, in the step 1, the drill holes on each buried slot are arranged, including a plurality of grounding holes arranged in sequence, and a plurality of auxiliary holes arranged on both sides of the grounding holes;

[0014] The auxiliary holes on both sides are symmetrically arranged on both sides of the grounding hole with the grounding hole as the center line, and the auxiliary holes on both sides are symmetrically arranged relative to the grounding hole;

[0015] The auxiliary holes on both sides are respectively located on both sides of the buried groove where the grounding hole is located;

[0016] The auxiliary hole is arranged perpendicularly to the grounding hole, and a lead wire avoidance space is arranged between the auxiliary hole and the grounding hole;

[0017] After drilling, keep the circle diameter inside the hole larger than 150mm and the drilling depth is 3000mm.

[0018] Preferably, at the corner of the embedding groove, an auxiliary corner hole is provided between two grounding holes, and a plurality of auxiliary grounding holes are provided between the auxiliary corner hole and the grounding hole;

[0019] The auxiliary grounding hole is arranged in parallel with the auxiliary corner hole, and the auxiliary grounding hole is arranged perpendicular to the grounding hole;

[0020] The auxiliary corner hole is arranged perpendicular to the grounding hole;

[0021] The auxiliary corner hole has a depth of 3000 mm and a width of 1000 mm;

[0022] The auxiliary grounding hole has a depth of 3000 mm and a length of 1500 mm.

[0023] Preferably, the auxiliary corner hole is located at the same distance from two grounding holes on both sides thereof.

[0024] Preferably, in the step 1, it also includes using a soil probing tube to probe the soil to determine a location suitable for opening the buried trench;

[0025] After cleaning the ground surface, a plurality of soil exploration holes are firstly opened in the area where the buried groove is located, which are respectively located at the corners, the middle and the edges of the buried groove;

[0026] Insert the soil detection tube to detect the soil quality below the surface and confirm the location and size suitable for the buried trench;

[0027] The distance between each soil exploration hole is not less than 5m, and the diameter of each soil exploration hole is 50mm;

[0028] When opening, choose a clear surface and a safe distance from buildings.

[0029] Preferably, after soil exploration is performed using a soil exploration pipe, a number of round steels are placed on the area where the buried trench is located for measurement to confirm the resistivity of the ground.

[0030] Preferably, the corner of the embedding groove is arranged close to the building area, the length of the embedding groove is 20m, the width is 2.1m, and the distance between two adjacent embedding grooves and the building is 1m;

[0031] The distance between the edge of the buried trench and the edge of the land is 1m;

[0032] The groove depth of the embedding groove is 4m, and the groove width of the embedding groove is adjusted according to the diameter of the round steel. The groove width of the embedding groove is not less than 500mm of the diameter of the round steel.

[0033] Preferably, a round steel bar is placed at the center of the embedding groove, and the length of several adjacent round steel bars in the embedding groove is kept greater than the span of the slot;

[0034] A plurality of fixing wires are arranged at intervals on the round steel, the fixing wires including a main fixing wire and a secondary fixing wire, in the corner area, the middle area and the edge area of ​​the embedding groove;

[0035] Round steels are bundled at equal intervals along the secondary fixing wire, the length of the bundled fixing wire is 1000 mm, and the wire diameter of the fixing wire is between 10-20 mm.

[0036] Preferably, a grounding flat iron is formed by 2m of steel bars;

[0037] At the connection between the grounding flat iron and the round steel, a plurality of connecting frames are arranged at intervals on the steel bar, the connecting frames include a support plate and a connecting rod arranged on the support plate, the connecting rod is provided with an opening, the round steel is arranged on the opening, and is connected to the round steel through a fixing piece;

[0038] The width of the support plate is between 400-1000 mm, and the length of the support plate is between 1-2 m;

[0039] The connecting rod is U-shaped, and a threading hole is opened at the bottom of the connecting rod, and the diameter of the threading hole is the same as that of the grounding flat iron;

[0040] The diameter of the threading hole is between 8 and 15 mm;

[0041] Two connecting rods are provided between the connection points of the support plate and the round steel;

[0042] The round steel is connected to the ends of the two connecting rods, and the angle between the center line of the connecting rod and the round steel is 90°;

[0043] After the grounding flat iron is connected to the round steel, it is then connected to the main fixed line;

[0044] The end of the steel bar is connected to the main fixed line, and the distance between two adjacent grounding flat irons is 2m.

[0045] After adopting the above technical solution, the grounding resistance modification method for hardened road surface provided by the present invention has the following beneficial effects compared with the prior art.

[0046] 1. By burying round steel in the borehole and using resistance reducing agent to inject, the soil resistivity can be significantly reduced, the conductivity of the grounding system can be improved, and the grounding resistance can be ensured to meet the design requirements. The connection between round steel and steel bars forms a stable grounding network, which can effectively disperse the current, reduce the risk of local overheating, and extend the service life of the lightning protection system.

[0047] 2. Clean and groove the ground surface before drilling to make the construction more standardized and orderly and avoid unnecessary damage to the existing road surface. The buried groove formed by the grooving will help with the subsequent drilling positioning, ensure the accuracy and consistency of the drilling, improve the construction efficiency and shorten the construction period.

[0048] 3. By setting grounding holes and auxiliary holes on each buried groove, the contact area of ​​the grounding system can be increased, the grounding effect can be improved, and the uniform distribution of current can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0050] Figure 1 It is a schematic diagram of the process of the present invention

[0051] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0053] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] Embodiment 1

[0057] like Figure 1 As shown, this embodiment provides a method for modifying the grounding resistance of a hardened road surface, the method comprising the following steps:

[0058] Step 1: Survey the terrain on site, use a drilling machine to drill holes, use a slotting machine to slot, obtain multiple drill holes, and then slot to obtain buried slots, and bury round steel in the multiple drill holes;

[0059] Step 2: The borehole is poured with a resistance reducing agent, and both ends of the round steel are connected to the steel bars;

[0060] Step 3: Make a lightning protection down conductor, one end of which is connected to the down conductor of the lightning rod or the arrester, and the other end is connected to the round steel.

[0061] The method drills a plurality of holes by a drilling rig, places round steel into the holes, injects a resistance reducing agent into the round steel, and then connects the steel bar to the round steel via a steel bar, the end of the steel bar is connected to a lightning protection down conductor, and the lightning rod or the lightning protection down conductor is connected to the lightning protection down conductor to ensure the connectivity between the steel bar and the round steel, thereby reducing the grounding resistance.

[0062] Furthermore, the plurality of drill holes are radially arranged with the plurality of round steels as the center. On the one hand, the round steels and the steel bars can improve the conductive efficiency and ensure that the grounding resistance is reduced.

[0063] On the other hand, by connecting round steel and steel bars, the strength of the connection can be improved, ensuring that the steel bars and round steel form a grid structure, thereby evacuating the charge of the entire ground and improving conductivity.

[0064] Furthermore, in the step 1, before drilling, the ground surface is cleaned and grooves are cut on the ground using an excavator to form a plurality of mutually parallel buried grooves on the ground, and a plurality of drill holes are arranged at intervals on each buried groove.

[0065] Before drilling, the ground surface is cleaned and grooved to make the construction more standardized and orderly, avoiding unnecessary damage to the existing road surface. The buried groove formed by the groove helps the subsequent drilling positioning, ensures the accuracy and consistency of the drilling, improves the construction efficiency, and shortens the construction period. By carrying out the groove and drilling in an orderly manner, the uncertainty and risk in the construction process are reduced, and the safety of the construction is improved.

[0066] Furthermore, when the buried groove is cut, round steel is installed in the soil of the buried groove, which can ensure that the round steel can be completely embedded in the groove, thereby improving the strength of the buried groove.

[0067] By setting grounding holes and auxiliary holes on each buried groove, the contact area of ​​the grounding system can be increased, the grounding effect can be improved, and the uniform distribution of current can be ensured.

[0068] The setting of auxiliary holes can help disperse the current, reduce the risk of local overheating, and extend the service life of the grounding system. The specific regulations on the diameter and depth of the drill hole ensure the effective burial depth of the grounding body and improve the reliability and stability of the grounding.

[0069] Preferably, at the corner of the buried groove, an auxiliary corner hole is set between the two drill holes, and a plurality of auxiliary grounding holes are set between the auxiliary corner hole and the grounding hole, so that the round steel in the buried groove is arranged in a grid shape to improve the conductive efficiency.

[0070] Adding auxiliary corner holes and auxiliary grounding holes at the corners of the buried trench can solve the problem of poor grounding effect at the bends of the traditional linear grounding system, ensuring uniform distribution and efficient operation of the entire grounding system. The design of auxiliary corner holes and auxiliary grounding holes is particularly suitable for roads or facilities with complex terrain, ensuring good grounding effect at different locations. By rationally arranging auxiliary holes and corner holes, the stability of the grounding system can be further enhanced and the negative impact of uneven current distribution can be reduced.

[0071] The auxiliary corner hole is at the same distance from the two grounding holes on both sides. Ensuring that the distances between the auxiliary corner hole and the grounding holes on both sides are equal helps maintain the symmetry of the grounding system and ensures uniform current distribution. Symmetrical hole layout can reduce local overheating caused by uneven current distribution and improve the overall performance of the system.

[0072] Furthermore, in the step 1, it also includes using a soil probing tube to probe the soil to determine a location suitable for opening the buried trench;

[0073] After cleaning the ground surface, a plurality of soil exploration holes are firstly opened in the area where the buried groove is located, which are respectively located at the corners, the middle and the edges of the buried groove;

[0074] Insert the soil detection tube to detect the soil quality below the surface and confirm the location and size suitable for the buried trench;

[0075] The distance between each soil exploration hole is not less than 5m, and the diameter of each soil exploration hole is 50mm;

[0076] When opening, choose a clear surface and a safe distance from buildings.

[0077] Using a soil probe to explore the soil can help you understand the underground soil conditions in advance, choose the most suitable location for construction, and avoid encountering hard objects or other obstacles during construction.

[0078] Furthermore, after probing the soil with a soil probing pipe, a number of round steel bars are placed on the area where the buried groove is located for measurement to confirm the resistivity of the ground;

[0079] By measuring the resistance, it is ensured that the resistivity is less than 0.8 ohms.

[0080] By placing round steel to measure the ground resistivity, the soil conductivity at different locations can be evaluated before construction to provide support for subsequent construction plans. The measurement results help optimize the design of the grounding system and ensure the best grounding effect.

[0081] Furthermore, the corner of the buried trench is arranged close to the building area, the length of the buried trench is 20m, the width is 2.1m, and the distance between two adjacent buried trenches 2 and the building is 1m;

[0082] The distance between the edge of the buried trench and the edge of the land is 1m;

[0083] The groove depth of the embedding groove is 4m, and the groove width of the embedding groove is adjusted according to the diameter of the round steel. The groove width of the embedding groove is not less than 500mm of the diameter of the round steel.

[0084] For areas close to buildings, reasonable buried trench design can minimize the impact on the surrounding environment and ensure the safety and environmental protection of construction.

[0085] Furthermore, a round steel is placed at the center of the embedding groove, and the length of a plurality of adjacent round steels in the embedding groove is kept greater than the span of the slot;

[0086] A plurality of fixing wires are arranged at intervals on the round steel, the fixing wires including a main fixing wire and a secondary fixing wire, in the corner area, the middle area and the edge area of ​​the embedding groove;

[0087] Round steels are bundled at equal intervals along the secondary fixing wire, the length of the bundled fixing wire is 1000 mm, and the wire diameter of the fixing wire is between 10-20 mm.

[0088] Further, when drilling with a drill, the diameter of each drill hole is between 150-200 mm, the depth of the drill hole is between 2000-3000 mm, the number of the drill holes is 3, and the interval is 1000 mm, with the middle drill hole as the center, the drill holes on both sides are symmetrically arranged on both sides of the middle drill hole, and the positions of the auxiliary holes on both sides are kept corresponding to each other;

[0089] The number of the buried grooves is 4, and grooves are cut along the buried grooves with the drill hole as the center, and the resistance reducing agent is poured into the grooves. The diameter of the resistance reducing agent is greater than 150 mm, and the pouring height of the resistance reducing agent is greater than 3000 mm;

[0090] The length of the round steel is not less than 3000mm;

[0091] The lower end of the round steel is connected with a round cake, the diameter of the round cake is the same as the diameter of the round steel and is larger than the diameter of the drilled hole.

[0092] Furthermore, in the step 1, a plurality of steel bars are connected to the end of the round steel, wherein the steel bar is composed of a plurality of steel bars, one end of the steel bar is connected to the round steel, and the other end is connected to the conductive wire;

[0093] The number of steel bars in each buried groove is at least 4;

[0094] The diameter of the steel bar is 10-15 mm;

[0095] The ends of the conductive wires are connected to joints, and the joints are respectively connected to the round steels. The surface of the conductive wires is coated with a rust inhibitor. The conductive wires are U-shaped and form a semicircular area. The conductive wires are arranged along the diameter of the semicircular area. The length of the conductive wires is between 0.5-1m, and the number of the conductive wires is the same as the number of the round steels.

[0096] Furthermore, in the step 1, a hole is first drilled in the ground using a drilling machine, and then a slotting machine is used to slot the buried slot, and the buried slot covers all the drilled holes;

[0097] Use an anti-rust pipe to connect with the round steel, place the anti-rust pipe along the groove, and ensure that the anti-rust pipe is connected with the round steel.

[0098] Embodiment 2

[0099] This embodiment is based on the embodiment 1. In the step 2, the drag reducing agent includes bentonite, graphite, aluminum powder, aluminum foil, cement and water agent;

[0100] The mass percentages of bentonite, graphite, aluminum powder, aluminum foil, cement and aqueous solution are 3.5%, 5%, 4%, 2%, 1.5%, 0.1% and 45% respectively;

[0101] Mix according to a certain proportion, stir evenly and then pour into the borehole. After the pouring is completed, keep it for 24 hours.

[0102] Furthermore, in the step 2, when the resistance reducing agent is poured, stirring is performed by a stirrer, the stirrer adopts dry stirring, and after stirring evenly, a pouring machine is used for pouring, and a pouring pump is arranged between the stirrer and the pouring machine, and the pouring pump adopts a gear pump.

[0103] Furthermore, in the step 3, the steel bar is a grounding flat iron, and the grounding flat iron is composed of 2m steel bars;

[0104] The grounding flat iron is connected to the round steel, and the end of the grounding flat iron is connected to the steel bar.

[0105] Further, at the connection between the grounding flat iron and the round steel, a plurality of connecting frames are arranged at intervals on the steel bar, the connecting frames include a support plate and a connecting rod arranged on the support plate, the connecting rod is provided with an opening, the round steel is arranged on the opening, and is connected to the round steel through a fixing piece;

[0106] The width of the support plate is between 400-1000 mm, and the length of the support plate is between 1-2 m;

[0107] The connecting rod is U-shaped, and a threading hole is opened at the bottom of the connecting rod, and the diameter of the threading hole is the same as that of the grounding flat iron;

[0108] The diameter of the threading hole is between 8 and 15 mm;

[0109] Two connecting rods are provided between the connection points of the support plate and the round steel;

[0110] The round steel is connected to the ends of the two connecting rods, and the angle between the center line of the connecting rod and the round steel is 90°;

[0111] After the grounding flat iron is connected to the round steel, it is then connected to the main fixed line;

[0112] The ends of the steel bars are connected to the main fixing line, and the distance between two adjacent steel bars is 2m.

[0113] Furthermore, at the connection between the round steel and the support plate, two U-shaped connecting rods are respectively arranged on both sides of the support plate, and the round steel is kept at the inner bottom of two adjacent connecting rods on both sides.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A method for modifying ground resistance of hardened road surface, characterized in that: The method comprises the following steps: Step 1: Survey the terrain on site, use a drilling machine to drill holes, obtain multiple holes, and bury round steel in the multiple holes; Step 2: The borehole is poured with a resistance reducing agent, and both ends of the round steel are connected to the steel bars; Step 3: Make a lightning protection down conductor, one end of which is connected to the down conductor of the lightning rod or the arrester, and the other end is connected to the round steel.

2. A method for modifying ground resistance of a hardened road surface according to claim 1, characterized in that: In the step 1, before drilling, the ground surface is cleaned and grooves are cut on the ground using an excavator to form a plurality of mutually parallel buried grooves on the ground, and a plurality of drill holes are arranged at intervals on each buried groove.

3. A method for modifying ground resistance of hardened road surface according to claim 2, characterized in that: In the step 1, the drill holes on each buried slot are arranged, including a plurality of grounding holes arranged in sequence, and a plurality of auxiliary holes arranged on both sides of the grounding holes; The auxiliary holes on both sides are symmetrically arranged on both sides of the grounding hole with the grounding hole as the center line, and the auxiliary holes on both sides are symmetrically arranged relative to the grounding hole; The auxiliary holes on both sides are respectively located on both sides of the buried groove where the grounding hole is located; The auxiliary hole is arranged perpendicularly to the grounding hole, and a lead wire avoidance space is arranged between the auxiliary hole and the grounding hole; After drilling, keep the circle diameter inside the hole larger than 150mm and the drilling depth is 3000mm.

4. A method for modifying ground resistance of a hardened road surface according to claim 3, characterized in that: At the corner of the embedding groove, an auxiliary corner hole is provided between two grounding holes, and a plurality of auxiliary grounding holes are provided between the auxiliary corner hole and the grounding hole; The auxiliary grounding hole is arranged in parallel with the auxiliary corner hole, and the auxiliary grounding hole is arranged perpendicular to the grounding hole; The auxiliary corner hole is arranged perpendicular to the grounding hole; The auxiliary corner hole has a depth of 3000 mm and a width of 1000 mm; The auxiliary grounding hole has a depth of 3000 mm and a length of 1500 mm.

5. A method for modifying ground resistance of hardened road surface according to claim 4, characterized in that: The auxiliary corner hole is respectively located at the same distance from two grounding holes on both sides thereof.

6. A method for modifying ground resistance of hardened road surface according to claim 2, characterized in that: In the step 1, it also includes using a soil exploration tube to explore the soil to determine a location suitable for opening the buried trench; After cleaning the ground surface, a plurality of soil exploration holes are firstly opened in the area where the buried groove is located, which are respectively located at the corners, the middle and the edges of the buried groove; Insert the soil detection tube to detect the soil quality below the surface and confirm the location and size suitable for the buried trench; The distance between each soil exploration hole is not less than 5m, and the diameter of each soil exploration hole is 50mm; When opening, choose a clear surface and a safe distance from buildings.

7. A method for modifying ground resistance of hardened road surface according to claim 6, characterized in that: After probing the soil with a soil probing pipe, a number of round steel bars are placed on the area where the buried trench is located for measurement to confirm the resistivity of the ground.

8. A method for modifying ground resistance of hardened road surface according to claim 6, characterized in that: The corner of the buried trench is arranged close to the building area, the length of the buried trench is 20m, the width is 2.1m, and the distance between two adjacent buried trenches and the building is 1m; The distance between the edge of the buried trench and the edge of the land is 1m; The groove depth of the embedding groove is 4m, and the groove width of the embedding groove is adjusted according to the diameter of the round steel. The groove width of the embedding groove is not less than 500mm of the diameter of the round steel.

9. A method for modifying ground resistance of hardened road surface according to claim 6, characterized in that: Placing a round steel bar at the center of the embedding groove, and keeping the length of a plurality of adjacent round steel bars in the embedding groove greater than the span of the slot; A plurality of fixing wires are arranged at intervals on the round steel, the fixing wires including a main fixing wire and a secondary fixing wire, in the corner area, the middle area and the edge area of ​​the embedding groove; Round steels are bundled at equal intervals along the secondary fixing wire, the length of the bundled fixing wire is 1000 mm, and the wire diameter of the fixing wire is between 10-20 mm.

10. A method for modifying ground resistance of hardened road surface according to claim 9, characterized in that: It also includes a grounding flat iron formed by a 2m steel bar; At the connection between the grounding flat iron and the round steel, a plurality of connecting frames are arranged at intervals on the steel bar, the connecting frames include a support plate and a connecting rod arranged on the support plate, the connecting rod is provided with an opening, the round steel is arranged on the opening, and is connected to the round steel through a fixing piece; The width of the support plate is between 400-1000 mm, and the length of the support plate is between 1-2 m; The connecting rod is U-shaped, and a threading hole is opened at the bottom of the connecting rod, and the diameter of the threading hole is the same as that of the grounding flat iron; The diameter of the threading hole is between 8 and 15 mm; Two connecting rods are provided between the connection points of the support plate and the round steel; The round steel is connected to the ends of the two connecting rods, and the angle between the center line of the connecting rod and the round steel is 90°; After the grounding flat iron is connected to the round steel, it is then connected to the main fixed line; The end of the steel bar is connected to the main fixed line, and the distance between two adjacent grounding flat irons is 2m.

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