UA18464U - Method of diagnostics and prediction of durability of the concrete sewer pipelines - Google Patents

Abstract

The Method of diagnostics and prediction of durability of concrete sewer pipelines includes the measuring of the hydrogen ionization value of the filmcondensate moisture on the vault surface of the concrete sewer pipeline with the help of a solid phase electrode with consequent definition of the rate of concrete corrosion. After measuring of the pH value of the film and condensate moisture, in addition, a reduction rate of the width of the concrete sewer pipeline is determined.

Description

Description of the invention

The useful model refers to the field of municipal and industrial sewage systems and can be used to diagnose the reliability of concrete sewer pipelines.

In order to prevent significant accidents on concrete sewer pipelines, various methods of diagnosing and predicting the reliability of these pipelines are developed and used.

Among the factors that affect the reduction of reliability and durability of concrete sewer pipelines, microbiological corrosion of concrete occupies the main city. Microbiological corrosion of concrete 70 sewage pipelines is caused by biogenic sulfuric acid aggression. As operational experience shows, most accidents of concrete sewer pipelines occur as a result of the destruction of their vault, which is in contact with a gaseous environment containing hydrogen sulfide.

Corrosion of concrete is caused by the vital activity of thion bacteria, which oxidize hydrogen sulfide, dissolved in condensate moisture on the vault of the sewer pipeline, to sulfuric acid and cause corrosion of 12 concrete of the second type according to Moskvin's classification.

A known method of diagnosing the reliability of concrete sewer pipelines, which includes examination of their inner surface using mobile mobile TV and video equipment and subsequent analysis of the data obtained |D.F. Honcharenko, I.V. Korynko "Repair and restoration of sewage networks and construction" Kharkiv "Rubikon", 1999, p. 55-58).

This method allows you to prevent some emergency situations on sewage networks.

The disadvantages of this method include a number of high requirements for television equipment: explosion protection, sufficient lighting, insensitivity to temperature and shock.

In addition, this method is visual and does not provide a quantitative assessment of the state of damage to the concrete of sewage pipelines by biogenic sulfuric acid aggression.

There is also a known method of diagnosing and predicting the reliability of concrete sewer pipelines by assessing the degree of aggressiveness of the environment on the pipeline vault, in particular, based on the determination of the concentration of microbial cells of thion bacteria per unit surface of the pipeline | Kiozze M.

Viodepe ZopugeGeizame Coigtosviop. Aremazzeg Jesppik, 1985. 36, Mo1, v. 13-21.

However, this method is rather complicated, as it requires the presence of a special microbiological laboratory in compliance with all rules of sterility. In addition, this method requires at least 10 days for execution.

The closest analogue, similar to the proposed solution, is the method of determining the degree of aggressiveness M of the operating environment in relation to concrete structures that are subject to sulfuric acid corrosion with

Declaration patent of Ukraine for the invention Mo50558, published on October 15, 2002, Bull. Mo10). 3o This method includes determining the rate of corrosion of concrete by measuring the pH value of film-condensate moisture on the surface of a concrete structure using a solid-phase electrode. Based on the obtained pH values of film condensate moisture, the rate of concrete corrosion is calculated using a mathematical apparatus. "

The disadvantages of this method include the fact that it makes it possible to determine only one indicator of the reliability of concrete sewer pipelines: the rate of corrosion of concrete. c But for complete diagnosis and forecasting of the reliability and durability of concrete sewage pipelines, one indicator is not enough.

The basis of the useful model is the technical task of creating such a method of diagnosing and predicting the reliability and durability of concrete sewer pipelines, in which, due to the use of new operations, it would be possible to provide a complete analysis of their condition. - The technical result, which is achieved when using this useful model, is to provide

Ge | complete analysis of the state of reliability and durability of concrete sewer pipelines.

This technical result is achieved by the fact that in the method of diagnosing and predicting the reliability and durability of concrete sewer pipelines, which includes the measurement of the pH value of film b 20 condensate moisture on the surface of the vault of the concrete sewer pipeline with the help of a solid-phase electrode and the subsequent determination of the rate of corrosion of concrete, according to a useful model , after

T» measurement of the pH value of the film condensate moisture additionally determines the rate of decrease in the thickness of the concrete sewer pipeline according to the formula:

Во зе пеки дву туге их Женя с тд ок и ИЙ де M - rate of decrease in the thickness of the concrete sewage pipeline, mm/year; и - 60 У - the volume of water evaporated in this area from the tray part of the concrete sewage pipeline, tyh "ON m/year; i vault area of the concrete sewer pipeline on this site, m; 65 Sh- conversion factor, kg-mU/percent. 0.04;

sh- coefficient of proportionality, mU/kg, 20.49.107. pH - pH of film condensate moisture; as well as the term until the limit state of the concrete sewer pipeline is reached according to the formula:

Ya. Shen 0 YOU see Y ! merge t not ДЯ some where and. - the period until the limit state of the concrete sewer pipeline is reached, year; 70 NE sh- coefficient, h/mm2, 9.87.107,;

I 0 - standard thickness of the concrete sewer pipeline, mm;

Chet po i - the limit corrosion value is established for concrete sewer pipelines of ТНбО-ЙЙ and

J

ТНВбО-П, equal to 0.75 and 0.7, respectively, рН - РН of the film condensate moisture conversion factor, h/year, 8760, and also the distance from the surface of the concrete sewage pipeline to the intact concrete according to the formula:

Me m KU grows drift and pen ENN may

С Кен шЭ де и - the distance from the surface of the concrete sewage pipeline to the undamaged concrete; with x t What , , , else , . . - i schu - the distance from the surface of the concrete sewage pipeline, the pH of film condensate moisture on it and the surface of which is equal to 0.5, to the undamaged concrete, equal to 92.1 mm;

Zhlen is a value that is equal to the value of the ordinate of the point of intersection of the x-coordinate of the pH of the film condensate "

The amount of moisture on the surface of the concrete sewer pipeline with the curve of the dependence of the distance from the surface of the concrete sewer pipeline to the undamaged concrete on the amount of film condensate moisture on this surface, while the rate of concrete corrosion is determined by the formula: nEblll dat ' (ge) "; ZY Zh osi I; O00olya lo z Bykov Kora oanr "- : i se s i i i i z i z i. where Me is the rate of corrosion, mm/year; " their swarm

Z. - depth of corrosion, cm; in the corner, ; in c and, - duration of acid aggression, h; . "» And with ; but ; but

Me says de - the duration of operation of the concrete sewage pipeline, h;

B - the coefficient that characterizes the water permeability of concrete, 30-40; z»: - Conversion factor, h/year, 8760; 1" is not a conversion factor, mm/cm, 10;

Ge") 20 pH - pH of film condensate moisture.

Their comparative analysis with the closest analogue shows that the ignition method of diagnosing and predicting the reliability and durability of concrete sewer pipelines differs in that, after measuring the pH value of the film condensate moisture, the rate of decrease in the thickness of the concrete sewer pipeline is additionally determined by the formula: 52 zones eye of the rod

B bon mi v ks hih nos me s ' s kako i M EI eh B niye M. Ei t TYA che Menni tn pyah 7 where M is the rate of decrease in the thickness of the concrete sewage pipeline, mm/year;

E y bo che y - the volume of water evaporated in this area from the tray part of the concrete sewer pipeline, tah vy Yak mU/year; i vault area of the concrete sewer pipeline on this site, m; 65

Sh- conversion factor, kg.mU/percent. 0.04; sh- coefficient of proportionality, m/kg, 20.49.1071,

pH - pH of film condensate moisture; as well as the term until the limit state of the concrete sewer pipeline is reached according to the formula: merge t not ДЯ some 0 | In what where and - the period until the limit state of the concrete sewer pipeline is reached, year;

Not shit. coefficient, h/mm2, 9.87.1072;

Ж - standard thickness of concrete sewer pipeline, mm;

Thu Ray

Me - the limit corrosion value is established for concrete sewer pipelines ТНбО-ИЙ and

ТНВбО-П, equal to 0.75 and 0.7, respectively, рН - рН of film condensate moisture, the conversion factor, h/year, 8760, ph, as well as the distance from the surface of the concrete sewer pipeline to the intact concrete is determined by the formula:

Me from KU vn! women, "NN uteii my t her chE sh : : : yes . where |, 7 Distance from the surface of the concrete sewer pipeline to intact concrete; - ki more Mel and more

Ia and the surface of which is equal to 0.5, to intact concrete, equal to 92.1 mm; "

І я - a value equal to the value of the ordinate of the point of intersection of the x-coordinate of the pH of film condensate Ge

The moisture echo on the surface of the concrete sewer pipeline with the curve of the dependence of the distance from the surface of the concrete sewer pipeline to the undamaged concrete on the amount of film condensate moisture on this surface, while the rate of concrete corrosion is determined by the formula: ve her Kiya tia, or:

Sh and same EE ; » it is also EN as ss I am Mr. KIMN and the mayor 7 EY ih EN Boxu i- ЕВ « e - rate of corrosion, mm/year; 20 d Yavnsche d rozi, year; depth of corrosion, cm; h NOT "» m ! . - and, - duration of acid aggression, h;

Sh udeif - the duration of operation of the concrete sewage pipeline, h; - TEMPERATURE OF CONSTRUCTION Z o B - the coefficient that characterizes the water permeability of concrete, 30-40 cm/h; сх - Conversion coefficient, h/year, 8760; i" schi bu 70 i conversion factor, mm/cm, 10; рН - pH of film condensate moisture.

The essence of the useful model is explained by graphic materials, where in Fig. the curve of the dependence of the distance from the surface of the concrete sewer pipeline to the intact concrete on the value of the pH of the film condensate moisture on this surface is shown. c The method is implemented as follows.

The solid-phase electrode is calibrated at a specified pH value in buffer solutions. The calibrated solid-phase electrode is installed for 1-2 seconds on the surface of the vault of the concrete sewer pipeline and the pH value of the film condensate moisture is measured in this city. 60 Then the rate of decrease in the thickness of the concrete sewer pipeline is determined by the formula: sh Shk agent o iy sr g sce (NY «IN BZ NIEYU Kornegu res, ss Koh tent 65 de 5 - the rate of decrease in the thickness of the concrete sewer pipeline, mm/year; ev u - the volume of water evaporated on the given site from the tray part of the concrete sewer pipeline, takh v Yak m/year; i the area of the vault of the concrete sewer pipeline on the given site, m;

Sh- conversion factor, kg.mU/percent. 0.04; sh- coefficient of proportionality, m/kg, 20.49-1071., 70 рН - pH of film condensate moisture; as well as the term until the limit state of the concrete sewer pipeline is reached according to the formula: ZE Kn sho de y. - the period until the limit state of the concrete sewer pipeline is reached, year;

Not shit. coefficient, h/mm2, 9.87.1072;

I 0 - standard thickness of the concrete sewer pipeline, mm;

Thu Ray

Me - the limit corrosion value is established for concrete sewer pipelines ТНбО-ИЙ and

ТНВбО-П, equal to 0.75 and 0.7, respectively, pH - pH of film condensate moisture conversion factor, h/year, 8760,

E - as well as the distance from the surface of the concrete sewage pipeline to the intact concrete is determined by the formula: зо Я Kot de и - the distance from the surface of the concrete sewage pipeline to the intact concrete; (Continued): the distance from the surface of the concrete sewer pipeline, the pH of film condensate moisture on it and the surface of which is equal to 0.5, to the intact concrete is 92.1 mm;

З М-шЭ - a value equal to the value of the ordinate of the point of intersection of the x-coordinate of the pH of the film condensate - nerve: ke -Я of moisture on the surface of the concrete sewer pipeline with the curve of the dependence of the distance from the surface of the concrete sewer pipeline to the intact concrete on the amount of film condensate moisture on this surface, as well as the rate of corrosion of concrete is determined by the formula: a Ж in October: gut slo zara, s Te vvtey 5 ШК Ж я и жек ваше ше U и M есснный Rожельнвя . "Mono lah ks EE for. НВ se ke :» сш В 2 I Я de yad - corrosion rate, mm/year;

Ka sri - - sh te depth of corrosion, cm; (Fe) and E ik | Y. fo - duration of acid aggression, h; her bu i, -i. eV, where i, - the duration of operation of the concrete sewage pipeline, h;

Я» B - the coefficient that characterizes the water permeability of concrete, 30-40 cm/h; sh - conversion factor, h/year, 8760; 59 i conversion factor, mm/cm, 10; pH - pH of film condensate moisture.

An example of the method.

With the help of a solid-phase electrode, an examination of the vault of the concrete sewer 60 pipeline in the mine on Volochaivska Street, Kharkiv was carried out.

The pH value of film condensate moisture was determined at several points and the average value was set.

Input data for subsequent calculations of reliability and durability indicators of the concrete sewer pipeline. vv

Name of the indicator Designation |Value

The diameter of the concrete sewer pipeline of Ho YII m

The brand of concrete pi SHY

Standard thickness of concrete sewer pipeline | wow

Duration of operation of the concrete sewer pipeline

The area of the vault of the concrete sewer pipeline on this site

The coefficient that characterizes the water permeability of concrete RO Zzbom 2Ich

The volume of water evaporated in this area from the tray part of the concrete sewer pipeline /Mvylo |Vtem Z/year 70 The magnitude of the limit corrosion for concrete sewer pipelines ТНбО-ИЙИ

According to the initial data of the main indicators, the following was obtained: the rate of decrease in the thickness of the concrete sewer pipeline:

VE nev kri Pany I coronation rea period until the limit state of the concrete sewage pipeline: nelyaatiya dtyzh Vrensuy dshrlntnh leto Eh sadziiyuyusrtt sdnyshnn, chi, Eezhmiya sarai s NK No. and

DUNY ant to determine the distance from the surface of the concrete sewer pipeline to the undamaged concrete constructed a curve of the dependence of the distance from the surface of the concrete sewer pipeline to the undamaged concrete on the pH of the film condensate moisture. As can be seen from the graph, for the surface of the concrete sewer pipeline with a pH of film condensate moisture equal to 0.5, the distance to the undamaged concrete (pt) is 92.1 mm. On the graph, we find the value of the ordinate of the point of intersection of the x-coordinate of the pH of the film condensate moisture - 1.57 with the curve of the dependence of the distance from the surface of the concrete sewer pipeline to the intact concrete on the value of the pH of the film condensate moisture (I bottom) As can be seen from the graph, I onu-99, 1 mm.

From here, the distance from the surface of the concrete sewer pipeline with the pH of film condensate moisture - 1.57 C to the intact concrete is: Ge)

SPOON MEN Gete There is t i LONNO che

According to the initial data of the main indicators, the rate of corrosion in this section of the concrete sewage pipeline was determined:

Claims (1)

"- The formula of the invention is a method of diagnosing and predicting the durability of concrete sewer pipelines, which includes the measurement of the pH value of film condensate moisture on the surface of the vault of a concrete sewage pipeline using a solid-phase electrode and the subsequent determination of the corrosion rate of concrete, and which differs in that after measuring the pH value film condensate moisture is additionally determined by the rate of reduction of the thickness of the concrete sewer pipeline according to the formula: the growth of the concrete sewer pipeline in the 7th century will bring Mnsh: decrease in the thickness of the concrete sewer pipeline, mm/year; with" ; - the volume of water evaporated in this area from the tray part of the concrete sewer pipeline, F 2 Mod mU/year; i" | ше о, в - the area of the vault of the concrete sewer pipeline on this site, m; Same conversion factor, kg-mU/percent. 0.04; with vgYa coefficient of proportionality, mU/kg, 20.49.1071; pH - the pH of film condensate moisture, as well as the time until the limit state of the concrete sewer pipeline is reached according to the formula: WHAT? sk suzhtv - sno vo in BAK i I TO ee Where. и sys рН : Y. t v sor i z not yet U Y dy de pre - period until the limit state of the concrete sewage pipeline arrives, year; 65 Also - that the coefficient, h./mm2, 9.87.10 2. tey, U.S. o - standard thickness of the concrete sewer pipeline, mm; Same - the amount of marginal corrosion is established for concrete sewer pipelines ТНбО-ИЙ and 95 ТНВбО-П, which is equal to 0.75 and 0.7, respectively; pH - pH of film condensate moisture; and the conversion factor, h./year, 8760, and i 'I and also the distance from the surface of the concrete sewage pipeline to the intact concrete according to the formula: I dnk two and two Where - the distance from the surface of the concrete sewage pipeline to the undamaged concrete; Ah 15. - the distance from the surface of the concrete sewage pipeline, the pH of film condensate moisture on the surface of which is equal to 0.5, to the intact concrete, which is equal to 92.1 mm; in. - a value that is equal to the value of the ordinate of the point of intersection of the x-coordinate of the pH film condensate moisture on the surface of the concrete sewer pipeline with the curve of the distance from the surface of the concrete sewer pipeline to the intact concrete, on the value of the film condensate moisture on this surface, while the rate of concrete corrosion is determined by by the formula: Mozhnr: i xx - I where she - corrosion rate, mm/year; Go tlia a « roya dya ssh - her, sm; and depth of corrosion, cm; with me; - duration of acid aggression, hours; "And I am. zgardiya ;, where a - the duration of operation of the concrete sewage pipeline, hours; со - : з5 ж M d h: to the coefficient that characterizes the water permeability of concrete, 30-40; c - conversion factor, hour/year, 8760; сх - Conversion factor, mm/cm, 10; « with ZHE 2 s pH - pH of film condensate moisture. . and? - (ee) sh» (o) s» s 60 b5