CN111883942B - High-resistance rock cavern indoor full-section combined grounding method - Google Patents
High-resistance rock cavern indoor full-section combined grounding methodDownload PDFInfo
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- CN111883942B CN111883942BCN202010670847.6ACN202010670847ACN111883942BCN 111883942 BCN111883942 BCN 111883942BCN 202010670847 ACN202010670847 ACN 202010670847ACN 111883942 BCN111883942 BCN 111883942B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
Description
Technical Field
The invention relates to a construction method for electrical grounding in a cavern in a high-resistivity environment, belongs to the field of electrical engineering, and particularly relates to a full-section combined grounding method in a high-resistivity cavern.
Background
At present, the grounding resistance reduction technical method under the high resistivity environment at home and abroad mainly comprises a method for enlarging the area of a grounding grid, a method for grounding a deep well, a method for changing soil, or a method for using a resistance reducing agent, externally leading grounding and the like or a combination of a plurality of methods for using; however, the specific application of this method in a small space environment in a lithologic cavern requires further investigation.
With the development of miniaturization of electrical equipment, the classic method for enlarging the area of the main grounding grid and the epitaxial grounding grid method are gradually eliminated, the addition of the vertical grounding electrode in a high-resistivity small space to reduce the grounding resistance is reasonable, the effect is obvious, and the main defects are the requirement of the grounding resistance and cost control.
Disclosure of Invention
The invention provides a full-section combined grounding construction technology in a lithologic cavern with high resistivity, which inherits the advantage of a method of adding a long vertical grounding electrode to a horizontal earth screen, carries out full-section three-dimensional grounding in a small space of the cavern under the condition of large change of underground geological conditions, scientifically and orderly combines various resistance reduction measures and carries out sectional construction in steps, is convenient to master the grounding resistance change caused by the change of the geological conditions, effectively controls the grounding construction engineering quantity and cost, and can be used for grounding engineering construction in places such as geological conditions with high soil resistivity, complex terrains and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a grounding device for reducing grounding resistance is as follows:
the method comprises the following steps: laying metal supporting meshes with a certain area on the side wall, the vault and the bottom of the cavern, and welding and connecting the metal supporting meshes together through galvanized flat steel;
step two: and further spraying cement slurry covering or fine soil covering on the surface of the metal support mesh sheet to form the grounding device for reducing the grounding resistance.
As a further scheme of the invention: each grounding section consists of a side wall grounding net, a vertical grounding hole array and a floor grounding net, wherein the side wall grounding net consists of an anchor rod array which is 1.5 meters deep and rejects 1.5 meters, a 25 x 4 galvanized flat steel net, a 20 x 20cm phi 8 steel bar supporting net and a 5-10 cm guniting support; the vertical grounding hole array is formed by connecting 6 vertical grounding holes with the aperture of 100-150 mm and the depth of 24-30 meters in parallel; the ground net of the terrace is composed of a phi 50 water pipe net and a phi 8 reinforcing steel bar supporting net (buried depth: 0.4 m) of 20 multiplied by 20cm.
As a still further scheme of the invention: each grounding section consists of a side wall grounding net, a vertical grounding hole array and a floor grounding net, wherein the side wall grounding net consists of an anchor rod array which is 1.5 meters deep and rejects 1.5 meters, a 25 x 4 galvanized flat steel net, a 20 x 20cm phi 8 steel bar supporting net and a 5-10 cm guniting support; the vertical grounding hole array is formed by connecting 6 vertical grounding holes with the aperture of 100-150 mm and the depth of 24-30 m in parallel; the ground net of the terrace is composed of a phi 50 water pipe net and a phi 8 reinforcing steel bar supporting net (buried depth: 0.4 m) of 20 multiplied by 20cm.
As a still further scheme of the invention: the grounding devices are mutually independent, and metal connection between the grounding devices is avoided.
As a still further scheme of the invention: on the basis of soil resistivity measurement and ground resistance rough calculation, the method of parallel connection and ground segment distribution construction through stepwise construction of the side wall ground net, the vertical ground hole array and the terrace ground net meets the requirement of ground resistance, and the related main technical contents are as follows:
(1) A side wall grounding grid construction method;
(2) A vertical grounding hole array construction method;
(3) A ground grid construction method for a terrace.
As a still further scheme of the invention: the construction method of the side wall grounding grid comprises the following steps:
the method comprises the following steps: constructing a grounding anchor rod array;
step two: welding flat steel;
step three: carrying out guniting support;
step four: and (6) measuring.
As a still further scheme of the invention: the construction method of the vertical grounding hole array comprises the following steps:
the method comprises the following steps: constructing a grounding hole;
step two: injecting saline water;
step three: flat steel welding;
step four: mixing and pouring resistance reducing agent;
step five: lowering an ion slow-release grounding electrode;
step six: filling resistance reducing agent;
step seven: and (6) measuring.
As a still further scheme of the invention: the floor grounding grid construction method comprises the following steps;
the method comprises the following steps: laying a water seepage pipe network;
step two: laying fine clay and resistance reducing agent;
step three: laying a terrace net;
step four: covering fine clay or making concrete terrace;
step five: welding and connecting the side wall grounding grid, the vertical grounding hole array and the floor grounding grid;
step six: 0.3 m away from the terrace net and 0.4 m away from the ground, the thickness of the layer is 2cm and 1m2 The zinc plate is used for cathode protection, and the corrosion of the grounding body is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention expands the full-section three-dimensional similar spherical grounding in the cavern on the basis of the traditional horizontal grounding network and vertical grounding method, effectively controls the engineering quantity and the construction cost by adopting a step-by-step and sectional construction technology, keeps the surrounding of a grounding body moist for a long time, resists corrosion and achieves the purpose of long-term stability and reliability of grounding resistance by adopting a water seepage pipe and cathode protection design.
The invention is used for the construction of grounding engineering in a cavern in a high-resistivity area, and the grounding construction technology of step-by-step, subsection, water seepage pipe network and cathode protection can be popularized to the plane grounding construction in the high-resistivity area, and has good application prospect.
Drawings
Fig. 1 is a flow chart of construction of a full-section combined grounding grid of a cavern in a full-section combined grounding method in a high-resistance cavern.
FIG. 2 is a flow chart of the construction of a side wall grounding grid in the full-section combined grounding method in the high-resistance rock cavern.
FIG. 3 is a construction flow chart of a vertical direct earth hole array in a full-section combined grounding method in a high-resistance rock cavern.
Fig. 4 is a flow chart of floor ground net construction in the high resistance rock cavern indoor full-section combined grounding method.
Fig. 5 is a schematic diagram of a cavity side wall grounding grid and a terrace grounding grid in the high resistance rock cavity full-section combined grounding method.
FIG. 6 is a schematic diagram of a grounding hole in the full-section combined grounding method in the high-resistance rock cavern.
Fig. 7 is a schematic view of the cross section of the terrace grounding grid in the high resistance rock cavern indoor full-section combined grounding method.
FIG. 8 is a plan view of a grounding water pipe network in the full-section combined grounding method in the high-resistance rock cavern.
Fig. 9 is a schematic diagram of a gallery side wall mesh in the full-section combined grounding method in the high-resistance rock cavern.
FIG. 10 is a diagram of the method for making the water seepage pipe network accessories in the full-section combined grounding method in the high-resistance rock cavern.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 10, in an embodiment of the present invention, a method for grounding a high-resistance rock cavern by combining full sections includes the following steps:
the method comprises the following steps: laying metal supporting net sheets with a certain area on the side wall, the vault and the bottom of the chamber, and welding the metal supporting net sheets together through galvanized flat steel;
step two: and further spraying cement slurry covering or fine soil covering on the surface of the metal support mesh sheet to form the grounding device for reducing the grounding resistance.
Each grounding device consists of 2-4 sections of full-section grounding sections with the length of 10 meters, the interval between every two grounding sections is 5-10 meters, and the grounding sections cannot be connected with each other by metal and are kept independent; according to the measuring condition of the grounding resistance, a plurality of grounding sections are welded and connected together by using not less than 2 galvanized flat steels with the size of 40 multiplied by 4 to form a grounding device.
Each grounding section consists of a side wall grounding net, a vertical grounding hole array and a floor grounding net, wherein the side wall grounding net consists of an anchor rod array with the depth of 1.5 meters and the row spacing of 1.5 meters, a 25 multiplied by 4 galvanized flat steel net, a 20 multiplied by 20cm phi 8 reinforcing steel bar supporting net and a 5-10 cm guniting support; the vertical grounding hole array is formed by connecting 6 vertical grounding holes with the aperture of 100-150 mm and the depth of 24-30 m in parallel; terrace ground net comprises phi 50 water pipe network + 20X 20 cm's phi 8 reinforcing bar support net, and the reinforcing bar support net buried depth: 0.4 m.
The grounding devices are mutually independent, and metal connection between the grounding devices is avoided.
Compared with the traditional construction method of the combined grounding grid, the invention mainly has three technical characteristics:
firstly, the full-section three-dimensional construction technology effectively utilizes the limited grounding space;
secondly, organically combining the shallow anchor rod array and the grounding net on the side wall of the cavern, and spraying concrete slurry to support by using a concrete spraying machine, so that the cavern construction space is saved, and the grounding resistance can be effectively reduced;
thirdly, a method of using a deep hole, a grounding net and a water seepage pipe net at the bottom of the cavern is used, the length of a grounding body is extended, the effective grounding area is increased, meanwhile, the water seepage pipe net is laid, the periphery of the terrace net is kept moist, the soil resistivity in the range of the effective grounding net is reduced, and the grounding resistance is kept stable for a long time;
and fourthly, a zinc plate is embedded, so that the corrosion of the grounding body is effectively reduced, and the grounding body is protected.
On the basis of soil resistivity measurement and ground resistance rough calculation, the method of parallel connection and ground segment distribution construction satisfies the requirement of ground resistance through the stepwise construction of the side wall ground net, the vertical ground hole array and the terrace ground net, and the related main technical contents are as follows:
(1) A side wall grounding grid construction method;
(2) A vertical grounding hole array construction method;
(3) A ground grid construction method for a terrace.
1. The construction method of the side wall grounding grid comprises the following steps:
the method comprises the following steps: constructing a grounding anchor rod array;
and drilling a grounding anchor rod array with the depth of 1.5 m and the row spacing of 1.5 m in the range of the grounding section, wherein the anchor rod is exposed out of the side wall by 20cm. The ground anchor should be spaced 0.5 meters from the anchor or metal member, if any, within the ground segment for other purposes.
Step two: welding flat steel;
and welding the anchor rod array into a grid shape by using 25 multiplied by 4 galvanized flat steel. Laying a finished supporting net. And (3) laying a200X 200, phi 8 steel bar supporting net along the side wall of the cavern in the range of the grounding section. All metal components in the grounding section are welded and connected into a whole. 3 pieces of 40 × 4 galvanized flat steel are welded along the cross section of the cavern and are welded with the support net, the anchor rod array and the 25 × 4 galvanized flat steel. The 3 flat steels are respectively exposed out of the side walls by 50cm at the bottoms of the two sides of the cavern.
Step three: carrying out guniting support;
all metal components such as the support net and the like in the grounding section are supported by spraying concrete slurry by a concrete spraying machine, and the thickness of the sprayed concrete support is 5-10 cm based on the coverage of the support net and the flat steel.
Step four: and (4) measuring.
And measuring and recording the grounding resistance of the grounding grid of the section of the side wall. If the grounding resistance is less than 4 omega, stopping construction, and if the grounding resistance is more than 4 omega, carrying out direct ground hole array construction of floor sag;
the construction method of the side wall grounding net is a construction method which is very suitable for a cavern, and is characterized in that metal supporting net pieces with a certain area are laid on the side wall of the cavern, the metal net pieces are welded together through galvanized flat steel, and cement slurry is sprayed on the surface of the supporting net pieces to cover the supporting net pieces so as to achieve the construction mode of the grounding device for reducing the grounding resistance.
2. The construction method of the vertical grounding hole array comprises the following steps:
the method comprises the following steps: constructing a grounding hole;
the ground section inner terrace is cleaned to be below minus 40cm, according to the construction drawing, 3 ground holes with the aperture of 100-150 mm and the depth of 24-30 m are respectively drilled in the ground section inner terrace with the distance of 0.5 m from the side wall and along the two sides of the side wall, the number of the ground holes is 6, and the distance between the ground holes is 5 m.
Step two: injecting saline water;
5kg of industrial salt is poured into the grounding hole, and then the hole wall is soaked in full water.
Step three: flat steel welding;
welding and extending the 40 multiplied by 4 galvanized flat steel to 25-31 meters, welding one ends of 3 pieces of the 25-31meters 40 multiplied by 4 galvanized flat steel together, and lowering the welded ends to the bottom of the grounding hole, wherein the drill hole is exposed out of the flat steel for about 100 cm.
Step four: mixing and pouring resistance reducing agent;
the friction reducer and water are mixed according to the weight ratio of 1: 1 and stirred into uniform paste by a handheld electric stirrer. And filling the paste resistance reducing agent into the grounding hole, and shaking the flat steel while filling until the grounding hole is filled.
Step five: lowering an ion slow-release grounding electrode;
and (3) putting an ion slow-release grounding electrode with the diameter of 50mm and the length of 2.5 m, and welding the ion slow-release grounding electrode with the flat steel in the hole.
Step six: filling resistance reducing agent;
and filling the resistance reducing agent in time after the dilute resistance reducing agent sinks. When the bore diameter of the drill hole is smaller than 100mm, filling the drill hole with the thin paste resistance reducing agent by using a mortar spraying machine, when the resistance reducing agent is injected, extending a grouting hose into the bottom of the drill hole, slowly pulling the hose outwards while injecting the resistance reducing agent until the resistance reducing agent is filled, and then lowering the flat steel.
Step seven: and (6) measuring.
And measuring the grounding resistance of the single hole, stopping construction if the grounding resistance is less than 4 omega, and performing construction of the next grounding hole if the grounding resistance is more than 4 omega. And the vertical grounding hole array is connected with the side wall grounding grid in parallel for measuring the ground resistance. And if the grounding resistance is less than 4 omega, stopping construction, and if the grounding resistance is more than 4 omega, constructing the floor grounding grid.
The construction of vertical grounding hole array is a method for drilling hole in grounding section, pouring resistance-reducing agent and placing ion grounding electrode.
3. The floor grounding grid construction method comprises the following steps:
the method comprises the following steps: laying a water seepage pipe network;
laying a phi 50 galvanized steel pipe net and a water injection container, drilling a phi 10 water outlet hole on each galvanized steel pipe every 0.5 m, wrapping the holes by 10 layers by using cotton gauze with the width of 3cm, and connecting the steel pipes by using screw threads and welding.
Step two: laying fine clay and resistance reducing agent;
laying a fine clay and resistance reducing agent mixture, wherein the weight ratio of the fine clay to the resistance reducing agent is =1:0.2, the steel tube is covered and the fine clay is rolled out and tamped.
Step three: laying a terrace net;
laying 100 x 100 and phi 8 steel bar support nets, welding the support nets, respectively welding 40 x 4 galvanized flat steels at the two sides and the middle of the support nets along the cross section of the cavern and welding the galvanized flat steels with the water seepage pipe and the ground hole flat steels, and welding all metal components in the floor net into a whole; 3 flat steel heads are reserved on two sides of the cavern respectively, and the side wall is exposed by 50cm.
Step four: covering fine clay or making concrete terrace; covering a layer of fine clay on the floor grid, leveling the clay with the ground of the cavern, rolling and tamping the clay or laying the concrete ground according to requirements, and finishing the construction of the floor grounding grid. And measuring and recording the ground resistance of the terrace net.
Step five: and welding and connecting the side wall grounding grid, the vertical grounding hole array and the floor grounding grid. And respectively welding and connecting the side wall grounding grid, the vertical grounding hole array and the terrace grounding grid together with the exposed flat steel by using 40 multiplied by 4 galvanized flat steel along two sides of the side wall of the cavern, and finishing the construction of the whole grounding section. The ground resistance of the ground segment is measured. And if the grounding resistance is less than 4 omega, stopping construction, and if the grounding resistance is more than 4 omega, performing construction of the next section of grounding section until the grounding resistance of the plurality of grounding sections connected in parallel is less than the design requirement of 4 omega.
Step six: 0.3 m away from the terrace net and 0.4 m away from the ground, the thickness of the layer is 2cm and 1m2 The zinc plate is used for cathode protection, and the corrosion of the grounding body is reduced.
The ground net construction of terrace net is a method for reducing ground resistance by laying water seepage pipe net, laying clay and resistance reducing agent, and welding reinforcing steel bar support net.
The invention expands the full-section three-dimensional similar spherical grounding in the cavern on the basis of the traditional horizontal grounding network and vertical grounding method, adopts the step-by-step and segmented construction technology, effectively controls the engineering quantity and the construction cost, adopts the design of the water seepage pipe and the cathode protection, keeps the surrounding of the grounding body moist for a long time, resists corrosion and achieves the purpose of long-term stability and reliability of the grounding resistance.
The invention is used for the construction of grounding engineering in a cavern in a high-resistivity area, and the grounding construction technology of step-by-step, subsection, water seepage pipe network and cathode protection can be popularized to the plane grounding construction in the high-resistivity area, and has good application prospect.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (1)
1. A full-section combined grounding method in a high-resistance rock cavern is characterized by comprising the following steps:
each grounding device consists of 2-4 sections of full-section grounding sections with the length of 10 meters, the interval between every two grounding sections is 5-10 meters, and the grounding sections cannot be connected with each other by metal and are kept independent from each other; according to the measuring condition of the grounding resistance, a plurality of grounding sections are welded together by not less than 2 galvanized flat steels with the size of 40 multiplied by 4 to form a grounding device; each grounding device is mutually independent, and the grounding devices cannot be connected with each other by metal;
each full-face grounding section is constructed step by step through a side wall grounding grid, a vertical grounding hole array and a terrace grounding grid, and the related construction method comprises the following steps: a side wall grounding grid construction method, a vertical grounding hole array construction method and a terrace grounding grid construction method;
the construction method of the side wall grounding grid comprises the following steps:
the method comprises the following steps: determining the position of a grounding section;
determining the position of a grounding section according to a construction drawing;
step two: constructing an anchor rod array;
drilling a grounding anchor rod array with the depth of 1.5 m and the row spacing of 1.5 m in the range of the grounding section, wherein the anchor rod is exposed out of the side wall by 20cm; if anchor rods or metal members for other purposes are arranged in the grounding section, the grounding anchor rods are separated from the anchor rods or the metal members by a distance of 0.5 m;
step three: welding flat steel;
welding the anchor rod array into a grid shape by using 25 multiplied by 4 galvanized flat steel;
step four: laying a finished supporting net;
laying a 200X 200, phi 8 reinforcing steel bar supporting net along the side wall of the cavern in the range of the grounding section;
step five: welding all the metal components to form a whole;
3 pieces of 40 × 4 galvanized flat steel are welded along the cross section of the cavern and are welded with the support net, the anchor rod array and the 25 × 4 galvanized flat steel; the 3 flat steels are respectively exposed out of the side walls by 50cm from the bottoms of the two sides of the cavern;
step six: carrying out guniting support;
spraying concrete grout on all metal components such as a supporting net and the like in the grounding section by using a concrete sprayer to support, wherein the thickness of the sprayed concrete support is subject to covering the supporting net and the flat steel by 5-10 cm;
step seven: measuring the grounding resistance;
measuring and recording the grounding resistance of the side wall grounding grid; if the grounding resistance is less than 4 omega, stopping construction; if the height is not less than 4 omega, carrying out direct ground hole array construction of the drooping of the terrace;
the construction method of the vertical grounding hole array comprises the following steps:
the method comprises the following steps: constructing a grounding hole;
cleaning the terrace in the grounding section to be below-40 cm, and drilling a grounding hole with the aperture of 100-150 mm and the depth of 24-30 m at a position 1m away from the side wall in the grounding section;
step two: injecting saline water;
pouring 5kg of industrial salt into the grounding hole, and then filling water to soak the hole wall;
step three: mixing the resistance reducing agent;
mixing the resistance reducing agent and water according to the weight ratio of 1: 1, and stirring the mixture into uniform paste by using a handheld electric stirrer;
step four: lowering flat steel;
welding one ends of 3 25-31 m galvanized flat steels with the size of 40 multiplied by 4 together, and putting the welded ends down to the bottom of the grounding hole, wherein the flat steels are exposed out of the grounding hole by about 100 cm;
step five: pouring a resistance reducing agent;
filling the paste resistance reducing agent into the grounding hole, and shaking the flat steel while filling until the grounding hole is filled;
step six: filling resistance reducing agent;
filling the dilute resistance reducing agent in time after the dilute resistance reducing agent sinks;
step seven: lowering a plasma grounding electrode;
lowering an ion slow-release grounding electrode with the diameter of phi 50 and the length of 2.5 meters, and welding the ion slow-release grounding electrode with the flat steel in the hole;
step eight: the single hole or the multiple holes are connected with the plasma grounding electrode in parallel;
step nine: measuring the grounding resistance;
if the grounding resistance is not less than 4 omega, performing next grounding hole construction, wherein the distance between every two grounding holes is more than 5 m; if the grounding resistance is less than 4 omega or the number of the grounding holes is increased to 6, connecting the side wall grounding net and the grounding hole array in parallel;
step ten: measuring the ground resistance after parallel connection;
if the grounding resistance after parallel connection is less than 4 omega, stopping construction; if the grounding resistance after parallel connection is not less than 4 omega, carrying out the ground grid construction of the terrace;
the floor grounding grid construction method comprises the following steps:
the method comprises the following steps: laying a water seepage pipe network;
laying a phi 50 galvanized steel pipe network and a water injection container, drilling phi 10 water outlets on the galvanized steel pipes every 0.5 m, wrapping the holes by 10 layers by using cotton gauze with the width of 5cm, and connecting the steel pipes by using screw threads and welding;
step two: laying fine clay and resistance reducing agent;
laying a fine clay and resistance reducing agent mixture, wherein the weight ratio of the fine clay to the resistance reducing agent is =1:0.2, covering the steel pipe, rolling and tamping;
step three: laying a finished product supporting net;
laying 100 x 100 and phi 8 steel bar support nets, and welding the support nets;
step four: the side wall grounding net, the grounding hole array, the water seepage pipe net and the floor net are connected in a welding way;
respectively welding 40X 4 galvanized flat steel on two sides and the middle of the support net along the cross section of the cavern and welding and connecting the support net with the water seepage pipe net, the flat steel of the grounding hole and the side wall grounding net;
step five: covering the mixture of the fine clay and the resistance reducing agent or drilling a concrete floor;
cover one deck fine clay and fall drag reducer mixture and cavern ground parallel and level and roll up the tamp on the terrace net upper surface, or lay concrete ground as required, wherein, fine clay and fall drag reducer weight ratio =1:0.2;
step six: measuring the grounding resistance;
measuring the grounding resistance of the grounding section; if the grounding resistance is less than 4 omega, stopping construction; if the grounding resistance is not less than 4 omega, performing the construction of the full-section combined grounding section of the next section of the cavern until the grounding resistance of the plurality of grounding sections connected in parallel is less than 4 omega;
step seven: 0.3 m away from the terrace net and 0.4 m away from the ground, the laying thickness is 2cm and 1m2 The zinc plate is used for cathode protection, and the corrosion of the grounding body is reduced.
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