CN113152508B - Conductive concrete shell, tower concrete foundation and construction process - Google Patents
Conductive concrete shell, tower concrete foundation and construction process Download PDFInfo
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- CN113152508B CN113152508B CN202110497509.1A CN202110497509A CN113152508B CN 113152508 B CN113152508 B CN 113152508B CN 202110497509 A CN202110497509 A CN 202110497509A CN 113152508 B CN113152508 B CN 113152508B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/82—Moulds built-up from several parts; Multiple moulds; Moulds with adjustable parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/86—Cores
- B28B21/88—Cores adjustable, collapsible or expansible
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/90—Methods or apparatus for demoulding or discharging after shaping
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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Abstract
The utility model provides a conductive concrete shell, shaft tower concrete foundation and construction technology, conductive concrete shell includes casing and lower casing, and lower casing is the open shell structure in bottom, and the centre bore has been seted up at the top of lower casing, goes up the casing and be tube structure, and the lower terminal surface cover of going up the casing is established in the centre bore department of casing down, and the inner wall of going up casing and casing down is provided with the insulating layer. The tower concrete foundation comprises a conductive concrete shell and a common concrete body poured in the concrete shell. According to the invention, the processes of foundation formwork and formwork assembly and disassembly can be omitted in the process of pouring the concrete foundation of the power transmission line tower, and the tower foundation can be poured only by covering the conductive concrete shell on the tower foundation reinforcement cage according to the position required by design and placing the conductive concrete shell on the tower foundation cushion layer, aligning the positioning device and welding the conductive concrete shell with the reserved reinforcement connecting steel bars.
Description
Technical Field
The invention relates to the technical field of lightning protection grounding, in particular to a conductive concrete shell, a tower concrete foundation and a construction process.
Background
The transmission line is an artery of the power system, connects the power plant, the transformer substation and all the users, and is responsible for the task of transmitting electric energy. The overhead transmission line is in an open field and extends longitudinally and transversely, and the probability of being struck by lightning is very high. According to incomplete statistics, lightning stroke tripping accidents of the power transmission line account for more than 60% of total tripping accidents of the power transmission line; the lightning trip-out accident is prevented and reduced, the main measure is to reduce the impact grounding resistance of the tower, transient lightning current is difficult to be discharged to a far position along a grounding body due to the existence of inductance effect, and the principle of reducing the impact grounding resistance of the tower is to enter the ground nearby.
The concrete foundation of the transmission line tower is deeply buried in the soil, the buried depth of some concrete foundations can reach more than 6 meters, the concrete foundation has larger volume and surface area, the concrete foundation is fully contacted with the soil, if the concrete foundation can be improved in electric conductivity, the concrete foundation can be used as an ideal natural grounding body, secondary excavation construction caused by grounding construction can be reduced, the investment of grounding materials can be saved, and the construction cost is saved. In addition, the service life of the concrete foundation of the tower is more than 70 years, so that the whole life cycle is free from maintenance really, and the labor and material cost for operation and maintenance is greatly saved. Researches show that the specific resistance of a tower concrete foundation is required to be below 100 omega-m to enable the tower concrete foundation to be a lightning protection grounding body, the main method for reducing the specific resistance of the concrete at present is to add an electrolyte ionic material and conductive carbon black, the electrolyte ionic material and the conductive carbon black are contacted with a steel bar material in the tower foundation to cause corrosion of the steel bar material, and particularly under the action of stray current, the corrosion of the steel bar material is accelerated, so that the mechanical performance of the tower concrete foundation is reduced.
In addition, the existing construction method of the concrete foundation of the transmission line tower generally comprises the following steps: preparing raw materials; secondly, excavating earth and stone; and (III) concrete casting, backfilling and the like, wherein the concrete casting process involves assembling templates and disassembling templates, and the process has low construction efficiency of the whole concrete foundation due to large workload and high working strength.
Disclosure of Invention
The invention aims to solve the technical problems and provide a conductive concrete shell, a tower concrete foundation and a construction process.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a conductive concrete shell for among overhead transmission line shaft tower concrete foundation earthing device, includes casing and lower casing, lower casing is the open shell structure in bottom, and the centre bore has been seted up at the top of lower casing, goes up the casing and be tube structure, and the lower terminal surface cover of going up the casing is established in the centre bore department of casing down, and the inner wall of going up casing and casing down is provided with the insulating layer.
As a further optimization of the conductive concrete casing of the present invention: the bottom of the lower shell is provided with a positioning seat connected with a tower foundation cushion layer and reserved connecting steel bars connected with a tower foundation steel bar cage, and the upper shell is provided with a lead-out conductor connected with a tower material angle steel grounding bolt hole.
As a further optimization of the conductive concrete casing of the present invention: the upper shell and the lower shell are both formed by prefabricating an inflatable rubber mold core by taking a galvanized steel wire mesh grid as a reinforcing rib and taking ion conductive cement as a cementing material.
As a further optimization of the conductive concrete casing of the present invention: the concrete poured when the upper shell and the lower shell are prefabricated comprises the following raw materials in percentage by weight: the concrete comprises portland cement, magnesium chloride, fine aggregate, coarse aggregate and water, wherein the weight ratio of the water to the portland cement is 0.35-0.45, the total weight ratio of the portland cement to the fine aggregate and the coarse aggregate is 1:2-3, and the addition amount of the magnesium chloride is 1-1.5% of the total weight of the concrete.
As a further optimization of the conductive concrete casing of the present invention: the mass ratio of the fine aggregate to the coarse aggregate is 3-5: 5-7.
As a further optimization of the conductive concrete casing of the present invention: the thickness of the shell and the lower shell is 100-200 mm.
A tower concrete foundation comprises the conductive concrete shell and a common concrete body poured in the concrete shell.
A construction method for a tower concrete foundation of an overhead transmission line is characterized in that a conductive concrete shell is covered on a tower foundation reinforcement cage according to the position of design requirements and is placed on a tower foundation cushion layer, then common concrete is poured into the conductive concrete shell, and the tower concrete is manufactured and backfilled into a foundation pit.
The construction method for the overhead transmission line tower concrete foundation is further optimized as follows: the method specifically comprises the following steps:
1) prefabricated conductive concrete shell
Firstly weaving a zinc-coated steel wire into a net-shaped reinforcing rib, embedding a slow release pipe in the reinforcing rib, uniformly distributing a plurality of slow release holes on the side wall of the slow release pipe, then installing the reinforcing rib, a bottom template, an end socket template, a rubber core mold and a side template, after the installation is finished, pouring conductive concrete, after the pouring is finished, detaching the rubber core mold and the rubber core template, curing the concrete, injecting slow release conductive liquid into the slow release pipe, and then plugging the pipe orifice of the slow release pipe to prepare a conductive concrete shell;
2) and excavating foundation pit
Excavating a foundation pit according to the grounding requirement, manufacturing a reinforcement cage at the bottom of the foundation pit and pouring a foundation cushion;
3) installing the conductive concrete shell
Covering the conductive concrete shell on a steel reinforcement cage of a tower foundation according to the position required by design, placing the conductive concrete shell on a cushion layer of the tower foundation, aligning the positioning device, and welding the reserved connecting steel bars of the shell with the steel reinforcement cage;
4) and casting concrete
Pouring concrete into the conductive concrete shell, and curing;
5) backfilling
And after the strength of the concrete poured in the conductive concrete shell reaches the standard, backfilling the foundation pit.
The construction method for the overhead transmission line tower concrete foundation is further optimized as follows: the preparation method of the conductive concrete in the step 3) comprises the following steps:
a. taking the raw materials according to the weight percentage for later use;
b. dissolving magnesium chloride in water to prepare a magnesium chloride aqueous solution for later use;
c. putting the portland cement, the fine aggregate and the coarse aggregate into a stirrer, and uniformly stirring;
d. and adding the magnesium chloride aqueous solution and the residual water into the stirrer, and uniformly stirring to obtain the conductive concrete.
Advantageous effects
Firstly, in the pouring process of the concrete foundation of the power transmission line tower, the procedures of a foundation template and assembling and disassembling the template can be omitted, in the pouring site of the concrete foundation of the tower, only the conductive concrete shell is required to be covered on a steel reinforcement cage of the tower foundation according to the position required by design and placed on a cushion layer of the tower foundation, and the positioning device is aligned and welded with the reserved steel bar connecting steel bar, then the pouring of the tower foundation can be carried out, and compared with the existing pouring process of the concrete foundation of the tower, the construction efficiency is obviously improved;
the concrete foundation of the power transmission line tower comprises a conductive concrete shell and ordinary concrete poured in the shell, when lightning strike occurs, lightning current conducts through the conductive concrete shell and leaks into the ground, due to the fact that the resistivity of the conductive concrete is different from that of the ordinary concrete, the inner structure of the concrete foundation is prevented from being damaged (firstly, a gap between the ordinary concrete and the shell is increased, and secondly, metal corrosion is accelerated due to the fact that the ordinary concrete conducts electricity), the insulating layer is arranged on the inner cavity wall of the conductive concrete shell, and the lightning current cannot conduct through the ordinary concrete in the conductive concrete shell.
Drawings
FIG. 1 is a schematic view of the external structure of a conductive concrete casing;
FIG. 2 is a schematic view of the internal structure of the conductive concrete casing;
the mark in the figure is: 1. upper casing, 2, lower casing.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in fig. 1: a conductive concrete shell is used in an overhead transmission line tower concrete foundation grounding device. The shell comprises an upper shell 1 and a lower shell 2, and the thicknesses of the shells and the lower shell 2 are both 100 mm. Go up casing 1 and casing 2 casting structure as an organic whole down to galvanized steel wire mesh grid is the strengthening rib, and ionic conduction cement is cementitious material, forms through adopting the rubber mold core prefabrication of aerifing.
The concrete raw materials poured when the upper shell 1 and the lower shell 2 are prefabricated comprise the following components in percentage by weight: the concrete comprises portland cement, magnesium chloride, fine aggregate, coarse aggregate and water, wherein the weight ratio of the water to the portland cement is 0.45, the total weight ratio of the portland cement to the fine aggregate and the coarse aggregate is 1:2, and the addition amount of the magnesium chloride is 1% of the total weight of the concrete. The mass ratio of the fine aggregate to the coarse aggregate is 3: 7.
The cement is P.O42.5 ordinary portland cement. The fine aggregate is river sand, and the particle size range of the fine aggregate is as follows: 0.15mm-4.75 mm. The coarse aggregate is crushed stone with the particle size of 5-10 mm, and the content of needle and sheet particles is not higher than 1.5%.
The upper shell 1 and the lower shell 2 have the following structure after being molded: lower casing 2 is the open shell structure in bottom, and the centre bore has been seted up at lower casing 2's top, goes up casing 1 and is the tube structure, and the lower extreme face guard of going up casing 1 is established in the centre bore department of casing 2 down, and the inner wall of going up casing 1 and casing 2 down is provided with the insulating layer. The bottom of the lower shell 2 is provided with a positioning seat connected with a tower foundation cushion layer and reserved connecting steel bars connected with a tower foundation steel bar cage, and the upper shell 1 is provided with a lead-out conductor connected with a tower material angle steel grounding bolt hole.
Example 2
As shown in fig. 1 and 2: a conductive concrete shell is used in an overhead transmission line tower concrete foundation grounding device. The shell comprises an upper shell 1 and a lower shell 2, and the thicknesses of the shells and the lower shell 2 are both 200 mm. Go up casing 1 and casing 2 casting structure as an organic whole to galvanized steel wire mesh grid is the strengthening rib, and ionic conduction cement is cementitious material, forms through adopting the prefabrication of aerifing the rubber mold core.
The concrete raw materials poured when the upper shell 1 and the lower shell 2 are prefabricated comprise the following components in percentage by weight: the concrete comprises portland cement, magnesium chloride, fine aggregate, coarse aggregate and water, wherein the weight ratio of the water to the portland cement is 0.35, the total weight ratio of the portland cement to the fine aggregate and the coarse aggregate is 1:3, and the addition amount of the magnesium chloride is 1.5 percent of the total weight of the concrete. The mass ratio of the fine aggregate to the coarse aggregate is 5: 7.
The cement is P.O42.5 ordinary portland cement. The fine aggregate is river sand, and the particle size range of the fine aggregate is as follows: 0.15mm-4.75 mm. The coarse aggregate is crushed stone with the particle size of 5-10 mm, and the content of needle and sheet particles is not higher than 1.5%.
The upper shell 1 and the lower shell 2 have the following structure after being molded: lower casing 2 is the open shell structure in bottom, and the centre bore has been seted up at lower casing 2's top, goes up casing 1 and is tube structure, and the lower extreme face guard of going up casing 1 establishes in casing 2's centre bore department down, and the inner wall of going up casing 1 and casing 2 down is provided with the insulating layer.
Example 3
A conductive concrete shell is used in an overhead transmission line tower concrete foundation grounding device. The shell comprises an upper shell 1 and a lower shell 2, and the thicknesses of the shells and the lower shell 2 are both 150 mm. Go up casing 1 and casing 2 casting structure as an organic whole down to galvanized steel wire mesh grid is the strengthening rib, and ionic conduction cement is cementitious material, forms through adopting the rubber mold core prefabrication of aerifing.
The concrete raw materials poured when the upper shell 1 and the lower shell 2 are prefabricated comprise the following components in percentage by weight: the concrete comprises portland cement, magnesium chloride, fine aggregate, coarse aggregate and water, wherein the weight ratio of the water to the portland cement is 0.4, the total weight ratio of the portland cement to the fine aggregate and the coarse aggregate is 1:2.5, and the addition amount of the magnesium chloride is 1.2% of the total weight of the concrete. The mass ratio of the fine aggregate to the coarse aggregate is 1: 1.
The cement is P.O42.5 ordinary portland cement. The fine aggregate is river sand, and the particle size range of the fine aggregate is as follows: 0.15mm-4.75 mm. The coarse aggregate is crushed stone with the particle size of 5-10 mm, and the content of needle and sheet particles is not higher than 1.5%.
The upper casing 1 and the lower casing 2 have the following structure after being molded: lower casing 2 is the open shell structure in bottom, and the centre bore has been seted up at lower casing 2's top, goes up casing 1 and is tube structure, and the lower extreme face guard of going up casing 1 establishes in casing 2's centre bore department down, and the inner wall of going up casing 1 and casing 2 down is provided with the insulating layer. The bottom of the lower shell 2 is provided with a positioning seat connected with a tower foundation cushion layer and a reserved connecting steel bar connected with a tower foundation steel bar cage, and the upper shell 1 is provided with a lead-out conductor connected with a tower material angle steel grounding bolt hole.
Example 4
A tower concrete foundation comprises the conductive concrete shell and a common concrete body poured in the concrete shell in the embodiment 1.
Example 5
A tower concrete foundation comprises a conductive concrete shell and a common concrete body poured in the concrete shell in the embodiment 2.
Example 6
A tower concrete foundation comprises a conductive concrete shell and a common concrete body poured in the concrete shell in the embodiment 3.
Example 7
A construction method for a concrete foundation of a pole tower of an overhead transmission line specifically comprises the following steps:
1) prefabricated conductive concrete shell
Firstly weaving a reticular reinforcing rib by using galvanized steel wires, embedding a slow release pipe in the reinforcing rib, uniformly distributing a plurality of slow release holes on the side wall of the slow release pipe, then installing the reinforcing rib, a bottom template, an end enclosure template, a rubber core mold and a side template, pouring conductive concrete after the installation is finished, removing the rubber core mold and the template after the pouring is finished, curing the concrete, injecting slow release conductive liquid into the slow release pipe, and then plugging the pipe orifice of the slow release pipe to prepare the conductive concrete shell.
The basic manufacturing process of the conductive concrete shell is basically the same as the process of manufacturing the hollow concrete block by using the rubber core mold in the prior art. The difference is two points, one point is that the poured concrete is ion conductive concrete, the other point is that a slow release pipe is embedded in the reinforcing rib, slow release conductive liquid is injected into the slow release pipe when the concrete is cured, and then the pipe orifice of the slow release pipe is blocked.
The preparation method of the conductive concrete comprises the following steps:
a. taking the raw materials according to the weight percentage defined in the embodiment 1 for later use;
b. dissolving magnesium chloride in water to prepare a magnesium chloride aqueous solution for later use;
c. putting the portland cement, the fine aggregate and the coarse aggregate into a stirrer, and uniformly stirring;
d. and adding the magnesium chloride aqueous solution and the residual water into the stirrer, and uniformly stirring to obtain the conductive concrete.
The side wall of the slow release pipe is uniformly provided with a plurality of slow release holes along the length direction, the slow release holes are holes obliquely penetrating through the side wall of the slow release pipe, the horizontal position of an opening of the slow release hole on the inner wall is higher than that of an opening of the slow release hole on the outer wall, glutinous rice diaphragms are filled in the slow release holes, and the glutinous rice diaphragms with different thicknesses are filled according to different required slow release times. When the maintenance is started, slow-release conductive liquid (the conductive liquid is 6-8% of ferric sulfate solution by mass concentration) is injected into the slow-release tube. Along with the maintenance, the conductive liquid in the slow release pipe erodes the glutinous rice diaphragm and enters the concrete, so that the internal resistance of the conductive concrete is further reduced.
2) And excavating foundation pit
Excavating a foundation pit according to the grounding requirement, manufacturing a reinforcement cage at the bottom of the foundation pit and pouring a foundation cushion;
when the foundation pit is excavated, a tower central pile and an auxiliary pile nailed during the recovery process are protected, the pit depth of a tower foundation is in accordance with the standard, and the elevation of the bottom of a hole is based on the top surface of the tower central pile; the excavated sediment is reasonably stored at a position 1m away from the pit opening to prevent the cast soil from falling back into the pit, and when the foundation pit is too deep, collapse prevention measures are taken; when the pit wall is excavated, the pit wall is vertically excavated and cannot be hollowed; after the excavation is finished, measuring whether the width and the depth of the pithead meet the standard or not; when a grounding ditch is excavated, sundries influencing the contact between a grounding body and soil in the ditch are removed; when the ground ditches are dug on the hillside, the ground ditches are preferably dug along contour lines, and the parallel distance between the two ground ditches is not less than 5 m;
3) installing the conductive concrete shell
Covering the conductive concrete shell on a steel reinforcement cage of a tower foundation according to the position required by design, placing the conductive concrete shell on a cushion layer of the tower foundation, aligning the positioning device, and welding the reserved connecting steel bars of the shell with the steel reinforcement cage;
4) and casting concrete
Pouring concrete into the conductive concrete shell, and curing;
5) backfilling
And after the strength of the concrete poured in the conductive concrete shell reaches the standard, backfilling the foundation pit once every 300mm of backfilling thickness, adding a covering object to the exposed part of the foundation, continuing watering and maintaining, and after all foundation activities are finished, cleaning all redundant excavation and construction materials on the site.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (2)
1. A construction method for a concrete foundation of a pole tower of an overhead transmission line is characterized by comprising the following steps: covering a conductive concrete shell on a tower foundation reinforcement cage according to the position of design requirements and placing the conductive concrete shell on a tower foundation cushion, wherein the conductive concrete shell comprises an upper shell and a lower shell, the lower shell is of a shell structure with an open bottom, the top of the lower shell is provided with a central hole, the upper shell is of a cylinder structure, the lower end face of the upper shell is covered at the central hole of the lower shell, the inner walls of the upper shell and the lower shell are provided with insulating layers, the bottom of the lower shell is provided with a positioning seat connected with the tower foundation cushion and a reserved connecting reinforcement connected with the tower foundation reinforcement cage, the upper shell is provided with a lead-out conductor connected with a grounding bolt hole on tower angle steel, the upper shell and the lower shell both use a galvanized steel wire mesh grid as reinforcing ribs, ion conductive cement as a cementing material, are prefabricated by adopting an inflatable rubber mold core and then cast ordinary concrete into the conductive concrete shell, the method comprises the following steps of finishing the manufacturing of the tower concrete foundation and backfilling a foundation pit, and specifically comprises the following steps:
1) prefabricated conductive concrete shell
Firstly weaving a zinc-coated steel wire into a net-shaped reinforcing rib, embedding a slow release pipe in the reinforcing rib, uniformly distributing a plurality of slow release holes on the side wall of the slow release pipe, then installing the reinforcing rib, a bottom template, an end socket template, a rubber core mold and a side template, after the installation is finished, pouring conductive concrete, after the pouring is finished, detaching the rubber core mold and the rubber core template, curing the concrete, injecting slow release conductive liquid into the slow release pipe, and then plugging the pipe orifice of the slow release pipe to prepare a conductive concrete shell;
2) excavation of foundation pit
Excavating a foundation pit according to the grounding requirement, manufacturing a reinforcement cage at the bottom of the foundation pit and pouring a foundation cushion;
3) installing the conductive concrete shell
Covering a conductive concrete shell on a tower foundation reinforcement cage according to the position required by design, placing the conductive concrete shell on a tower foundation cushion layer, aligning a positioning device, and welding the reserved connecting reinforcement of the shell with the reinforcement cage;
4) and casting concrete
Pouring concrete into the conductive concrete shell, and curing;
5) and backfilling
And after the strength of the concrete poured in the conductive concrete shell reaches the standard, backfilling the foundation pit.
2. The construction method according to claim 1, wherein: the preparation method of the conductive concrete in the step 1) comprises the following steps:
a. taking the raw materials according to the weight percentage, wherein the weight ratio of water to portland cement is 0.35-0.45, the ratio of portland cement to the sum of fine aggregate and coarse aggregate is 1:2-3, and the addition amount of magnesium chloride is 1-1.5% of the total weight of the concrete;
b. dissolving magnesium chloride in water to prepare a magnesium chloride aqueous solution for later use;
c. putting the portland cement, the fine aggregate and the coarse aggregate into a stirrer, and uniformly stirring;
d. and adding the magnesium chloride aqueous solution and the residual water into the stirrer, and uniformly stirring to obtain the conductive concrete.
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| CN111908854A (en) * | 2020-06-24 | 2020-11-10 | 国网江西省电力有限公司电力科学研究院 | Tower foundation with high conductivity and construction method thereof |
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