CN105206950A - Deep-hole two-point detonation grounding electrode structure and high-pressure pouring construction method thereof - Google Patents
Deep-hole two-point detonation grounding electrode structure and high-pressure pouring construction method thereof Download PDFInfo
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- CN105206950A CN105206950A CN201510650524.XA CN201510650524A CN105206950A CN 105206950 A CN105206950 A CN 105206950A CN 201510650524 A CN201510650524 A CN 201510650524A CN 105206950 A CN105206950 A CN 105206950A
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- 238000010276 construction Methods 0.000 title claims abstract description 24
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- 239000010959 steel Substances 0.000 claims abstract description 70
- 239000003638 reducing agent Substances 0.000 claims abstract description 25
- 239000011435 rock Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000002360 explosive Substances 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 6
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Abstract
The invention discloses a deep-hole two-point detonation grounding electrode structure and a high-pressure pouring construction method thereof and belongs to the technical field of hydraulic and hydropower engineering. The deep-hole two-point detonation grounding electrode structure comprises a grounding electrode installing hole which is located in the portion, provided with a grounding electrode, of the ground, a steel pipe is arranged in the grounding electrode installing hole, and a to-be-filled gap is reserved between the outer wall of the steel pipe and the grounding electrode installing hole; a slurry returning hole is formed in the pipe wall of the lower end of the steel pipe, the lower end and the upper middle segment of the steel pipe are provided with a first detonation point and a second detonation point respectively, the first detonation point and the second detonation point are formed after sequential detonation, and the portion, between the first detonation point and the second detonation point, of the to-be-filled gap is filled with resistance reducing agents. According to the technical scheme, due to the fact that two-point detonation is performed, a large number of rock stratum fractures and fault fractures are formed at the hole bottom, the space between the inner wall of the grounding electrode installing hole and the outer wall of the steel pipe is closed from the upper middle segment, then the resistance reducing agents are poured through high-pressure grouting, the equivalent grounding area, range and depth of the bottom of the grounding electrode are greatly increased, and a better resistance reducing effect can be achieved under the condition the same-depth deep-hole grounding electrode is obtained.
Description
Technical field
The invention belongs to Hydraulic and Hydro-Power Engineering technical field, relate to the grounding technology in a kind of hydroelectric project, especially relate to a kind of deep hole 2 pinking earth electrode structures and high pressure pouring construction method thereof.
Background technology
The introducing of grounding technology is the protective measure taked to prevent the equipment such as electric power or electronics to be struck by lightning at first, and object is that the thunder-strike current that thunder and lightning produces is incorporated into the earth by lightning arrester, thus plays the effect of architecture protection thing.Simultaneously; ground connection is also a kind of effective means of protection personal safety; the phase line caused when certain reason is (as wire insulation is bad; aging circuit etc.) and device housings touches time; the shell of equipment will produce by dangerous voltage; the fault current generated thus will flow through PE line to the earth, thus plays a protective role.
For reducing the earth resistance of power plant, grounding net of transformer substation, its conventional method has expansion ground network area-method, deep hole earthing, local soil replacement method, adopts resistance reducing agent, ionic earthing array method, inclined shaft ground connection and physical ground etc., can reach the effect reducing earth resistance in some cases.But work as region residing for ground network and belong to high soil resistivity, when belonging to again the engineering that need reduce earth resistance, all there is some defect and not too applicable in said method, such as expand ground network area-method be usually subject to the restriction of orographic condition and cannot implement, resistance reducing agent often can only be filled into the wall of a borehole magnitude range by deep hole earthing at the most, equivalence earth electrode size is limited, and effect is not ideal, and then cost is higher and effect is not ideal to adopt separately resistance reducing agent.Therefore, present stage is badly in need of a kind of earthing method being applicable to high soil resistivity.
Summary of the invention
In order to solve the problem, the invention provides a kind of deep hole 2 pinking earth electrode structures and high pressure pouring construction method thereof, thus reach the effect fully reducing grounded screen electric resistance rate, to guarantee the person and equipment security of operation.
The present invention is achieved by following technical solution.
A kind of deep hole 2 pinking earth electrode structures, comprise earth electrode installing hole, described earth electrode mounting hole site arranges earth electrode place in ground, is provided with steel pipe in described earth electrode installing hole, reserved gap to be filled between described outer wall of steel pipe and earth electrode installing hole; Described steel pipe lower end tube wall is provided with overfall hole, and described steel pipe lower end and middle epimere have the first detonation point and the second detonation point that are formed after priority pinking respectively, are filled with resistance reducing agent in the gap to be filled between the first detonation point to the second detonation point.
The described earth electrode installing hole degree of depth is at least 20m.
Described overfall hole is positioned at the above 2m scope in steel pipe lower end.
Described overfall hole is some groups of radially-arranged holes on tube wall, and often organize hole uniform in horizontal endless on tube wall, and often group is no less than 5, two adjacent groups is interlocked between hole up and down, radial spacing 100mm between group, aperture 12mm.
Described first detonation point is positioned at steel pipe bottom.
Described second detonation point is positioned at steel pipe epimere apart from steel pipe top 1/6 ~ 1/5 place.
A high pressure pouring construction method for deep hole 2 pinking earth electrode structures, comprises the steps:
A. preparative work before construction: the technique preparation before constructing, machinery prepare and preparation of construction;
B. hole: according to design aperture and the degree of depth, be drilled with earth electrode installing hole in the position of preparation ground connection;
C. steel pipe is laid: on the tube wall of steel pipe one end, evenly offer some overfall holes, and steel pipe centering is inserted in earth electrode installing hole, and the one end with overfall hole on steel pipe down;
D. a pinking: in conjunction with pinking operation on composite factors such as the impact of surrounding building, the safe buried depths of detonation point, determine the explosive payload of the first detonation point, put into the explosive of respective amount bottom steel pipe, implements the pinking construction of bottom the first detonation point;
E. cleaning is poured into: after the first detonation point is formed, the rock crack formed steel pipe inner wall, earth electrode installing hole the wall of a borehole, pinking by grouter circumfusion clear water, fault crevice are cleaned, remove impurity, guarantee that the follow-up resistance reducing agent being about to perfusion can enter in rock cranny to greatest extent;
F. two pinkings: in conjunction with pinking operation on composite factors such as the impact of surrounding building, the safe buried depths of detonation point, determine the second detonation point position and explosive payload, in steel pipe, epimere settles the explosive of respective amount apart from steel pipe top 1/6 ~ 1/5 place, implements the pinking construction of the second detonation point; Secondary detonation point place steel pipe is outwards swelled, fits with earth electrode installing hole hole wall, after the second detonation point is formed, cleaning steel pipe inner chamber;
G. resistance reducing agent perfusion: pour into resistance reducing agent to steel pipe inner chamber mesohigh, after injection pressure or groundwater increment reach and close slurry condition, takes out packer, continues slowly to inject resistance reducing agent to earth electrode installing hole aperture and ground network junction.
The invention has the beneficial effects as follows:
A kind of deep hole of the present invention 2 pinking earth electrode structures and high pressure pouring construction method thereof, by implementing 2 pinkings, a large amount of rock crack and fault crevice is formed at the bottom of hole, and therefrom epimere by the space-closed between earth electrode installing hole inwall and outer wall of steel pipe, resistance reducing agent is poured into again by high-pressure grouting, considerably increase equivalent contact area, scope and the degree of depth bottom earth electrode, in the deep hole earth electrode situation of same even depth, better resistance reducing effect can be reached; This construction method is a kind of effective reduction earth resistance and the construction method of economy and facility, makes the earth resistance of power station ground network be easier to meet related specifications requirement, ensures that equipment runs and personal safety.
Accompanying drawing explanation
Fig. 1 is the structural representation before pinking of the present invention construction;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the process chart of the present invention when constructing.
In figure: 1-first detonation point, 2-earth electrode installing hole, 3-steel pipe, 301-overfall hole, 4-second detonation point, 5-gap to be filled, 6-ground.
Embodiment
Technical scheme of the present invention is further described below in conjunction with accompanying drawing, but described in claimed scope is not limited to.
As shown in Figure 1 and Figure 2, a kind of deep hole of the present invention 2 pinking earth electrode structures, comprise earth electrode installing hole 2, described earth electrode installing hole 2 is positioned at ground and arranges earth electrode place, steel pipe 3 is provided with, reserved gap 5 to be filled between described steel pipe 3 outer wall and earth electrode installing hole 2 in described earth electrode installing hole 2; Described steel pipe 3 lower end tube wall is provided with overfall hole 301, described steel pipe 3 lower end and middle epimere have respectively in the gap to be filled 5 between the first detonation point 1 and the second detonation point 4, first detonation point 1 to the second detonation point 4 formed after priority pinking and are filled with resistance reducing agent.
Described earth electrode installing hole 2 degree of depth is at least 20m, to guarantee that electric current is fully imported the end, ground by earth electrode.
Described overfall hole 301 is positioned at the above 2m scope in steel pipe 3 lower end; Overfall hole 301 is some groups of radially-arranged holes on tube wall, and often organize hole uniform in horizontal endless on tube wall, and often group is no less than 5, two adjacent groups is interlocked between hole up and down, radial spacing 100mm between group, aperture 12mm.
Described first detonation point 1 is positioned at steel pipe 3 bottom, some irregular rock cracks of dispersing and fault crevice will be formed in ground 6 around at the bottom of earth electrode installing hole 2 hole after pinking, resistance reducing agent will be poured in this crack, fully to increase the contact area between resistance reducing agent and bottom, reduce the earth resistance of junction.
Described second detonation point 4 is positioned at steel pipe 3 epimere apart from steel pipe 3 top 1/6 ~ 1/5 place, after pinking, this place's steel pipe 3 will form bulge, bulge and earth electrode installing hole 2 hole wall fit tightly, by gap to be filled 5 reserved between steel pipe 3 outer wall and earth electrode installing hole 2 from the space-closed between the second detonation point 4 to the first detonation point 1.
As shown in Figure 3, the high pressure pouring construction method of a kind of deep hole 2 pinking earth electrode structures, comprises the steps:
A. preparative work before construction: the technique preparation before constructing, machinery prepare and preparation of construction;
B. hole: according to design aperture and the degree of depth, be drilled with earth electrode installing hole 2 in the position of preparation ground connection, the drilling depth of earth electrode installing hole 2 need reach this area's ground connection depth standards;
C. steel pipe is laid: on the tube wall of steel pipe 3 one end, evenly offer some overfall holes 301, and steel pipe 3 centering is inserted in earth electrode installing hole 2, and the one end with overfall hole 301 on steel pipe 3 down;
D. a pinking: in conjunction with pinking operation on composite factors such as the impact of surrounding building, the safe buried depths of detonation point, determine the explosive payload of the first detonation point 1, the explosive payload of the first detonation point 1 is being guaranteed under safe prerequisite herein, earth electrode installing hole 2 hole bed rock soil cracking gap can be caused to be diffused as object as far as possible with its explosive force; Bottom steel pipe 3, put into the explosive of respective amount, implement the pinking construction of bottom the first detonation point 1, after pinking, steel pipe 3 lower end is strutted by shake, forms rock crack and the fault crevice of some irregular distributions around at the bottom of the first detonation point 1 earth electrode installing hole 2 hole;
E. cleaning is poured into: after the first detonation point 1 is formed, by grouter to fresh water pouring in steel pipe 3, clear water enters after steel pipe 3 by overfall hole 301, gush from gap 5 to be filled reserved between steel pipe 3 outer wall and earth electrode installing hole 2, flow out from earth electrode installing hole 2 mouthfuls end, thus realize cleaning steel pipe 3 inwall, earth electrode installing hole 2 the wall of a borehole, the rock crack of pinking formation, fault crevice, remove the impurity such as silt, guarantee that the follow-up resistance reducing agent being about to perfusion can enter in rock cranny to greatest extent;
F. two pinkings: in conjunction with the impact of pinking operation on surrounding building, the composite factors such as the safe buried depth of detonation point, determine position and the explosive payload of the second detonation point 4, in steel pipe, epimere settles the explosive of respective amount apart from steel pipe 3 top 1/6 ~ 1/5 place, implement the pinking construction of the second detonation point 4, secondary detonation point 4 place steel pipe 3 is outwards swelled, fit with earth electrode installing hole 2 hole wall, gush to stop in resistance reducing agent backflow, increase bottom injection pressure, in the rock crack enabling resistance reducing agent infiltrate ground 6 as far as possible on a large scale and fault crevice, to reach the effect increasing equivalency tables area bottom earth electrode, after second detonation point 4 is formed, cleaning steel pipe 3 inner chamber,
G. resistance reducing agent perfusion: pour into resistance reducing agent to steel pipe 3 inner chamber mesohigh, after injection pressure or groundwater increment reach and close slurry condition, takes out packer, continues slowly to inject resistance reducing agent to earth electrode installing hole 2 aperture and ground network junction.
The technical program is specially adapted to the less transformer substation in city in underground water content is few, water permeable ability is poor high resistivity soil, place or is positioned at the power station in mountain area.The earth resistance of power station ground network can be made to be easier to meet related specifications requirement by the technical program, ensure that equipment runs and personal safety, economy and facility.
Claims (7)
1. a deep hole 2 pinking earth electrode structures, comprise earth electrode installing hole (2), described earth electrode installing hole (2) is positioned at ground and arranges earth electrode place, it is characterized in that: in described earth electrode installing hole (2), be provided with steel pipe (3), reserved gap to be filled (5) between described steel pipe (3) outer wall and earth electrode installing hole (2); Described steel pipe (3) lower end tube wall is provided with overfall hole (301), described steel pipe (3) lower end and middle epimere have the first detonation point (1) and the second detonation point (4) that are formed after priority pinking respectively, are filled with resistance reducing agent in the gap to be filled (5) between the first detonation point (1) to the second detonation point (4).
2. a kind of deep hole according to claim 12 pinking earth electrode structures, is characterized in that: described earth electrode installing hole (2) degree of depth is at least 20m.
3. a kind of deep hole according to claim 12 pinking earth electrode structures, is characterized in that: described overfall hole (301) is positioned at the above 2m scope in steel pipe (3) lower end.
4. a kind of deep hole according to claim 12 pinking earth electrode structures, it is characterized in that: described overfall hole (301) is some groups of radially-arranged holes on tube wall, often organize hole uniform in horizontal endless on tube wall, and often group is no less than 5, two adjacent groups is interlocked between hole up and down, radial spacing 100mm between group, aperture 12mm.
5. a kind of deep hole according to claim 12 pinking earth electrode structures, is characterized in that: described first detonation point (1) is positioned at steel pipe (3) bottom.
6. a kind of deep hole according to claim 12 pinking earth electrode structures, is characterized in that: described second detonation point (4) is positioned at steel pipe (3) epimere apart from steel pipe (3) top 1/6 ~ 1/5 place.
7. a high pressure pouring construction method for deep hole 2 pinking earth electrode structures, is characterized in that, comprise the steps:
A. preparative work before construction: the technique preparation before constructing, machinery prepare and preparation of construction;
B. hole: according to design aperture and the degree of depth, be drilled with earth electrode installing hole (2) in the position of preparation ground connection;
C. steel pipe is laid: on the tube wall of steel pipe (3) one end, evenly offer some overfall holes (301), and steel pipe (3) centering is inserted in earth electrode installing hole (2), one end of steel pipe (3) upper band overfall hole (301) is down;
D. a pinking: in conjunction with pinking operation on composite factors such as the impact of surrounding building, the safe buried depths of detonation point, determine the explosive payload of the first detonation point (1), put into the explosive of respective amount in steel pipe (3) bottom, implement the pinking construction of bottom the first detonation point (1);
E. cleaning is poured into: after the first detonation point (1) is formed, the rock crack formed steel pipe (3) inwall, earth electrode installing hole (2) the wall of a borehole, pinking by grouter circumfusion clear water, fault crevice are cleaned, remove impurity, guarantee that the follow-up resistance reducing agent being about to perfusion can enter in rock cranny to greatest extent;
F. two pinkings: in conjunction with pinking operation on composite factors such as the impact of surrounding building, the safe buried depths of detonation point, determine the second detonation point (4) position and explosive payload, in steel pipe, epimere settles the explosive of respective amount apart from steel pipe (3) top 1/6 ~ 1/5 place, implements the pinking construction of the second detonation point (4); Secondary detonation point (4) place steel pipe (3) is outwards swelled, fits with earth electrode installing hole (2) hole wall, after the second detonation point (4) is formed, cleaning steel pipe (3) inner chamber;
G. resistance reducing agent perfusion: pour into resistance reducing agent to steel pipe (3) inner chamber mesohigh, after injection pressure or groundwater increment reach and close slurry condition, take out packer, continue slowly to inject resistance reducing agent to earth electrode installing hole (2) aperture and ground network junction.
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| CN201510650524.XA CN105206950B (en) | 2015-10-10 | 2015-10-10 | A kind of 2 pinking earthing pole structures of deep hole and its high pressure pouring construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106299739A (en) * | 2016-08-14 | 2017-01-04 | 中国电建集团贵阳勘测设计研究院有限公司 | 2 pinking earthing pole structures of deep hole and secondary high-pressure pouring construction method thereof |
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| CN201781076U (en) * | 2010-03-15 | 2011-03-30 | 广西地凯科技有限公司 | Anti-corrosion and resistance-diminishing electrolytic grounding device |
| CN205069896U (en) * | 2015-10-10 | 2016-03-02 | 中国电建集团贵阳勘测设计研究院有限公司 | 2 knockings earthing pole structures of deep hole |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299739A (en) * | 2016-08-14 | 2017-01-04 | 中国电建集团贵阳勘测设计研究院有限公司 | 2 pinking earthing pole structures of deep hole and secondary high-pressure pouring construction method thereof |
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