SU1241331A1 - Grounding stake - Google Patents

Description

The invention relates to electric power industry for grounding power lines and electrical installations of alternating current and direct current and industrial and civil engineering for building foundations with non-metallic earthing,

The purpose of the invention is to increase the reliability of grounding and durability of reinforced concrete structures,

FIG. 1 shows a grounding, general view; figure 2 - section aa in figure 1, fig.Z - the flow of corrosive currents,

The earthing switch contains a continuous o, a barrel 1 of electrically conductive concrete, located on the part of the base immersed in the ground (construction, concrete) 2 of reinforced concrete construction.

The metal reinforcement 3 of the part of the reinforced concrete structure placed in the ground is partially housed outside the building concrete 2, and the electrically conductive concrete covers this Part of the reinforcement 3 to form an adhesive bond with the concrete 2. I

Electric current i, for example, a short circuit, flows from the reinforcement 3 into the protective grounding sheath 1, then from its entire surface into the ground 4. Structural concrete 2 and metallic reinforcement 3, which is simultaneously the current lead of the structure, carry the mechanical load.

Since the construction concrete 2 / does not come into contact (Fig. 3) with the electrolyte of the soil 4, one part of the reinforcement 3 that is in contact with the construction concrete 2 works in the anode mode and the second part which comes in contact with the electrically conductive concrete the cathode. In this case, the corrosive current of a macropair is a metal in building concrete-metal in electrically conductive concrete flows through the circuit: from the cathode through a layer of electrically conductive concrete 1 and a layer of building concrete 2 to the anode. The corrosive current in a circuit created by a concrete support with a grounding device is determined by the formula

t - -k

 . where srd is the electrochemical potential of the anode (reinforcement in building concrete);

,,

electrochemical potential of the cathode (fittings in electrically conductive concrete); the total resistance in the corrosion current circuit is determined by the formula

 GK g + g

2

where g is the resistance of the layer of building concrete support; Tj - resistance layer of electrically conductive concrete supports.

The potential of the anode of the proposed device, in contrast to the grounding device with a separate earthing device, is formed under the influence of two materials: building concrete, which forms a potential equal to +0.15 V, and electrically conductive concrete, which polarizes the anode towards the cathode potential +0.2 - +0 3.B.

This is due to the fact that - the total surface of the carbon of electrically conductive concrete is larger than the surface of steel - the anode in building concrete -.

The potential of the cathode — steel in electric conductive concrete — remains unchanged, i.e. is equal to +0.2 - +0.3 V,

Thus, the potential between the different parts of the reinforcement is reduced due to the claim, due to the effect of the ground electrolyte in the process of forming the potential of the anode. The magnitude of the corrosion current is equal to Cj) -q) | 4-25 mV, g, 289.0 m, Then

t - 25-10- f; s-in- A

JK 289

The current density j at the contact area of the reinforcement with the building concrete support, equal to 0.08 m, is.

, j 10.8MO A / m2.

The resulting corrosion current density is less than the permissible value of 0.06 A / m, which increases the durability of the structure and the reliability of its grounding.

The manufacturing technology of the proposed device depends on its shape. In any case, the volume framework of the reinforcement of a reinforced reinforced concrete structure is made so that its external elements are partially or completely enclosed in a sheath of electrically conductive concrete. In the manufacture of centrifuged supports

3

electrically conductive concrete is taken so that it partially covers the external elements of the reinforcement. After centrifuging it into the inner molded part, construction concrete is loaded, and the centrifugation is continued until complete compaction. At the same time, monolithic adherence of electrically conductive and construction concrete and their mutual penetration near the border are achieved. The manufacture of two types of reinforced concrete products immersed in the ground, for example by vibro-laying, is possible through the use of a known method — double formwork, into the gap of which, when pulling out the internal formwork, the solution of electrically conductive concrete is poured. In this case, the inner formwork may have a corrugated shape to ensure direct contact of electrically conductive concrete with reinforcement.

241331

 Ф о рм ул and

the invention

The earthing switch consists of two parts, the first of which is the base of the reinforced concrete structure placed in the ground, and the second is the element of electrically conductive concrete that has electrical contact with the first part of the earthing switch, so that the purpose of increasing, durability and reliability of grounding, the reinforcement of the part of reinforced concrete structure placed in the ground is at least partially located outside the building concrete, and

an element of conductive concrete is placed on the part of the concrete structure, which is immersed in the ground, with the coating of the said part of the armor placed outside the building beta, and forming adhesion adhesion to the building concrete.

Aa

fi 2

Editor I. Casard

Compiled by .L.Yanvareva Tehred O.Sopko

Order 3606/49 Circulation 597 Subscription.

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

fig.Z

Proofreader L. Patay

Claims (1)

'The claims are so large that they partially cover the external elements of the reinforcement. After centrifugation, construction concrete is loaded into the inner molded part, and centrifugation continues until complete compaction. In this case, monolithic adhesion of electrically conductive and building concrete is achieved and their mutual penetration is near the border. The manufacture of two varieties of reinforced concrete products immersed in the ground, for example by vibro-laying, is possible through the application of the known method - 15 double formwork, into the gap of which, when pulling out the internal formwork, a solution of the composition of electrically conductive concrete is poured. In this case, the inner formwork may have a corrugated-20 bathtub shape to ensure direct contact of electrically conductive concrete with reinforcement. An earthing switch, consisting of two parts, the first of which is the base of a reinforced concrete structure placed in the ground, and the second is an element of conductive concrete having electrical contact with the first part of the earthing switch, characterized in that, in order to increase, durability and reliability of grounding, fittings the part of the reinforced concrete structure placed in the ground is at least partially placed outside the building concrete, and the element of conductive concrete is placed on the part of the reinforced concrete structure immersed in the soil with a coating the specified part of the reinforcement placed outside the building concrete, and with the formation of adhesive adhesion to the building concrete. AA fie.Z