CN113435684A - Non-excavation repair decision-making method for pipeline defects - Google Patents
Non-excavation repair decision-making method for pipeline defects Download PDFInfo
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Abstract
The invention discloses a decision-making method for trenchless repair of pipeline defects, which comprises an integral evaluation model and a repair decision model; wherein: and (3) overall evaluation model: obtaining the defect value of each pipeline; calculating structural defect parameters, structural defect density values, functional defect parameters and functional defect density values of all pipe sections of the pipeline; performing defect grade pre-classification on all pipe sections; calculating ZF values and ZSm values and ZG values and ZYm values of the pipelines through an overall evaluation function and evaluating the ZF values and the ZSm values and the ZG values and the ZYm values; repairing the decision model: substituting the corresponding construction period, applicable pipes, repair scale and occupied area of each repair method into a repair decision index function, calculating to obtain a decision index, calculating the first three items with larger final values according to the decision index to serve as alternative repair methods, and finally selecting the repair method with the lowest construction cost; the method can help designers to quickly decide an economical and feasible pipeline non-excavation repairing method, is accurate and efficient, and saves the construction period.
Description
Technical Field
The invention relates to the technical field of drainage pipeline repair, in particular to a decision-making method for trenchless repair of pipeline defects.
Background
With the rapid development of the economy of China, the construction scale of urban infrastructure is larger and larger, and the total mileage of urban underground pipe networks is longer and longer. According to statistics, the length of the urban drainage pipeline in China exceeds 75 km, and the urban drainage pipeline which is in urgent need of repair and update reaches 30 km each year to reach the service life. Researches find that a plurality of structural defects occur in a drainage pipeline built before 2015 due to earth surface load change, underground water and soil loss, pipeline corrosion, pipe aging and other reasons, some of the structural defects seriously affect the normal operation of the pipeline, and even cause the phenomenon that the pipeline is damaged to endanger the safety of a road structure. Therefore, the pipelines with defects are urgently needed to be checked and repaired, the urban potential safety hazards are eliminated, and the normal operation of urban veins is guaranteed.
"trenchless engineering" is approved by the environmental agenda (UNEP) of the united nations as an environmentally friendly technology (EST) for underground facilities. The non-excavation technology for the municipal pipeline has the advantages of low comprehensive cost, short construction period, small environmental influence, no influence on traffic, no influence on resident life, good construction safety and the like, is increasingly favored by people, can be widely applied to the construction of underground pipeline engineering such as municipal drainage pipelines, communication cables, gas pipelines and the like, and has good economic benefit and social benefit.
Compared with open cut, the drainage pipeline non-excavation technology has the following advantages:
1. the disassembly and the damage to the environment are avoided to the maximum extent, and the investment is reduced;
2. only a working pit is dug locally, so that the influence of pavement removal and public traffic is reduced;
3. the equipment construction speed is high, the noise is low, the construction period is short, and the factor of disturbing residents is reduced;
4. the construction safety is good, and the comprehensive cost is low.
At present, drainage pipeline non-excavation repair methods are various, such as point in-situ curing repair, stainless steel foaming cylinder repair, pipeline SCL soft lining repair, mechanical spiral pipe lining repair, pull-in type ultraviolet in-situ curing repair, turnover type in-situ curing repair, stainless steel double-expansion ring repair and the like, and some of the technologies are suitable for local repair, some of the technologies are suitable for overall repair, and the application conditions and the engineering unit price are greatly different.
Currently, a single pipe section defect detection and evaluation method exists, and a related technical regulation, namely urban drainage pipeline detection and evaluation technical regulation CJJ181-2012 (hereinafter referred to as technical regulation); although the evaluation flow and the evaluation method of a single pipe section are gradually accepted and applied, the decision of the repair method is still completed by a plurality of times of evaluation of a great deal of manpower. At present, a large-scale pipeline overall evaluation method with multiple pipeline sections even exceeding 5km is still blank in the industry, so how to carry out overall evaluation on large-scale pipeline defects and quickly decide a trenchless repair method with feasible technology, economy and reasonability is a problem to be solved urgently in the current industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pipeline defect non-excavation repair decision-making method aiming at the defects in the prior art, and after large-scale pipeline detection, the system is utilized to help a designer to quickly decide an economical and feasible pipeline non-excavation repair method, so that the method is accurate and efficient, and the construction period is saved. .
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a decision-making method for trenchless repairing of pipeline defects, which is characterized in that whether a pipeline to be repaired is repaired or not is determined according to an evaluation result of an integral evaluation model, and a pipeline trenchless repairing means is determined according to a result of a repairing decision-making model; the specific method comprises the following steps:
and (3) overall evaluation model:
a1, obtaining detection results of each pipeline, wherein the detection results comprise the defect types and the defect scores of the pipelines;
a2, calculating a structural defect parameter F, a structural defect density value Sm, a functional defect parameter G and a functional defect density value Ym of each pipe section of the pipeline by using the defect score;
a3, setting a limit interval of a structural defect parameter F and a functional defect parameter G, and performing defect grade pre-classification on all pipe sections, wherein the classification comprises four types of general structural defects, serious structural defects, general functional defects and serious functional defects;
a4, substituting the F, G, Sm and Ym values of all single pipe sections under each classification into an overall evaluation function of structural defect parameters and functional defect parameters, and calculating a ZF value, a ZSm value, a ZG value and a ZYm value of the pipeline, wherein ZF represents the overall structural defect parameters of the pipeline, ZSm represents the overall structural defect density value of the pipeline, ZG represents the overall functional defect parameters of the pipeline, and ZYm represents the overall functional defect density value of the pipeline;
a5, utilizing an evaluation table of comparison of ZF values, ZSm values, ZG values and ZYm values with corresponding indexes to perform overall evaluation on the four types of defective pipeline defects and determine whether to repair the defects wholly or locally; whether to perform maintenance, overall or local maintenance;
repairing the decision model:
b1, introducing 5 influencing factors, including: construction period t, applicable pipe p, repair scale m, occupied area c and construction cost q;
b2, simultaneously substituting 4 corresponding influence factors of the repair method, such as construction period t, applicable pipe p, repair scale m and occupied area c, into a repair decision index function for each repair method, respectively calculating to obtain corresponding decision indexes J, and calculating the first three items with larger final values according to the decision indexes J to serve as alternative repair methods;
and B3, carrying out project cost q influence factor accounting on the obtained three alternative repairing methods, and taking a repairing method with the lowest comprehensive cost as a finally selected repairing method.
Further, the method for calculating the structural defect parameter F, the structural defect density value Sm, the functional defect parameter G, and the functional defect density value Ym of each pipe section in the step a2 specifically includes:
the structural defect parameters of the pipe section are calculated according to the following formula:
when S ismaxWhen S is greater than or equal to F ═ Smax
When S ismaxIf < S, F ═ S
In the formula: f, structural defect parameters of the pipe section; smax-parameters of the condition of damage to the pipe section, where the damage is the most severe in structural defects of the pipe sectionA score of (d); s, calculating the average value of the pipe section damage condition parameters according to the number of defect points;
the structural defect density should be calculated as follows:
in the formula: sM-pipe segment structural defect density; l is the length of the pipe section in m; l isi1-structural defect length in m with a longitudinal clear distance greater than 1.5 m; l isi2-a structural defect length in m with a longitudinal clear distance greater than 1.0m and not greater than 1.5 m;
the functional defect parameters of the pipe section are calculated according to the following formula:
when Y ismaxWhen Y is not less than Y, G ═ Ymax
When Y ismaxWhen < Y, G ═ Y
In the formula: g, functional defect parameters of the pipe section; y ismax-a pipe section operating condition parameter, the score of the most severe of the functional defects; y is the running condition parameter of the pipe section, the average value of the functional defect calculated according to the number of the defect points;
the functional defect density should be calculated as follows:
in the formula: y isM-pipe section functional defect density; l is the length of the pipe section; l isj1-a functional defect length with a longitudinal clear distance of more than 1.5 m; l isj2-a functional defect length with a longitudinal clear distance of more than 1.0m and not more than 1.5 m.
Further, the method for pre-classifying the defect levels of all the pipe sections by setting the limit interval in the step a3 specifically comprises the following steps:
when the value range of the structural defect parameter F of the pipeline is F less than or equal to 3, the structural defect of the pipeline does not influence the use; when the value range of F is more than 3, the use is influenced by the structural defects of the pipeline; when the value range of the functional defect parameter G is G less than or equal to 3, the operation of the pipeline is not greatly influenced; when the value range of G is G > 3, the operation of the pipeline is influenced;
pre-classifying all pipe sections according to the calculation result, namely classifying F less than or equal to 3 as a general structural defect, and classifying F more than 3 as a serious structural defect; g is less than or equal to 3 and is classified as general functional defect, and G is more than 3 and is classified as serious functional defect;
if a pipe section has both structural defects and functional defects, the functional defects are ignored according to the structural defects.
Further, the method for calculating the overall evaluation function of the structural defect parameters and the functional defect parameters in step a4 specifically includes:
and performing weighted calculation on all the pipe sections under each classification, and performing overall evaluation on the structural defects, wherein the calculation formula is as follows:
wherein inWeighted by each pipe section, and
fn (x) is a structural defect parameter calculation value of the nth section of pipeline; n is the number of the pipe sections;
and performing overall evaluation on the functional defects, wherein the calculation formula is as follows:
wherein inWeighted for each pipe sectionAnd is and
gn (x) is a calculated value of the functional defect parameter of the nth section of the pipeline; and n is the number of the pipe sections.
Further, in step a5 of the present invention, if the structural defect is detected, the method for evaluating the structural defect specifically includes:
calculating ZF value and ZSm value of the structural defect;
substituting the calculated ZF value into a calculation formula of the integral pipeline repair index ZRI:
ZRI＝0.7ZF+0.1K+0.05E+0.15T
wherein ZRI is the pipe segment repair index; k is an area importance parameter; e is a pipeline importance parameter; t is a soil property influence parameter;
if the calculated integral repair index ZRI is less than or equal to 1, no repair is needed; if the value is more than or equal to 1 and less than or equal to ZRI and less than or equal to 4, only a repair plan is made without repairing in a short period; if 4 is less than ZRI, the repair measures should be taken as soon as possible;
further, comparing the calculated integral structure defect density ZSm value with 0.5, if the defect density ZSm is less than or equal to 0.5, the defect is a local structure defect, and only local repair is needed; if the defect density ZSm is greater than 0.5, the defect is a defect of the entire structure, and the entire structure needs to be repaired.
Further, in the step a5 of the present invention, if the defect is a functional defect, the evaluation method comprises:
for functional defects, calculating ZG values and ZYm values;
substituting the calculated ZG value into a calculation formula of the overall maintenance index ZMI of the pipeline:
ZMI＝0.8ZG+0.1K+0.05E
wherein ZMI is a pipe section maintenance index; k is an area importance parameter; e is a pipeline importance parameter;
if the calculated overall curing index ZMI is less than or equal to 1, curing is not needed; if ZMI is more than or equal to 1 and less than or equal to 4, maintenance is not needed in a short period, and only a maintenance plan is made; if the ZMI is more than 4, the maintenance measures should be taken as soon as possible;
comparing the calculated value of the integral functional defect density ZYm with 0.5, and if the defect density ZYm is less than or equal to 0.5, determining that the defect is a local functional defect and only needing local repair; if the defect density ZSm is greater than 0.5, the defect is an overall functional defect and needs to be repaired as a whole.
Further, the repair decision index function in step B2 of the present invention is specifically:
the repair decision index function is as follows:
J＝f(p,c,m,t)＝16p+5.4m1.52-0.5c-1.21t2
wherein, J-repair index; p is applicable pipe, when the repaired pipeline pipe belongs to the range of the pipe applicable to the repairing method, p is 1, otherwise p is 0; c-area occupied, unit m2Repairing the area of the motor vehicle lane occupied by mechanical equipment and the like; m-scale of repair, where m is 1 when the repair method is applicable to local repair, m is 2 when applicable to global repair, and m is 3 when both are applicable; t is the construction period, unit d, and working day required by unit length pipeline repair.
The invention has the following beneficial effects:
1. the evaluation model can quickly evaluate the structural defects and the functional defects of the multi-pipe-section pipeline, and can integrally evaluate the long-line pipeline more than 5 km;
2. a repair decision model is added, and multi-factor directional screening is adopted, so that a decision maker can select a repair method which is feasible in technology, economical and reasonable scientifically and rapidly;
3. only the prepositive work such as pipeline detection is needed, and through the decision-making system, a decision maker can realize the whole-flow work from evaluation to selection of a repair scheme, optimize programs and flows, save the construction period and the manufacturing cost and man-hour.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a pipeline integrity assessment repair decision model according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention consists of two models, namely an overall evaluation model and a repair decision model. Firstly, a report that a detection unit detects all pipelines in a project range is obtained, and a detection result comprises the defect type and the corresponding score of each section of pipeline.
The calculation method for calculating the structural defect parameter F, the structural defect density value Sm, the functional defect parameter G and the functional defect density value Ym of each pipe section according to the corresponding scores specifically comprises the following steps:
the structural defect parameters of the pipe section are calculated according to the following formula:
when S ismaxWhen S is greater than or equal to F ═ Smax
When S ismaxIf < S, F ═ S
In the formula: f, structural defect parameters of the pipe section; smax-a pipe segment damage status parameter, a score of the most damaged part of the structural defects of the pipe segment; s, calculating the average value of the pipe section damage condition parameters according to the number of defect points;
the structural defect density should be calculated as follows:
in the formula: sM-pipe segment structural defect density; l is the length of the pipe section in m; l isi1-structural defect length in m with a longitudinal clear distance greater than 1.5 m; l isi2-a structural defect length in m with a longitudinal clear distance greater than 1.0m and not greater than 1.5 m;
the functional defect parameters of the pipe section are calculated according to the following formula:
when Y ismaxWhen Y is not less than Y, G ═ Ymax
When Y ismaxWhen < Y, G ═ Y
In the formula: g-functional Defect parameter of pipe section；Ymax-a pipe section operating condition parameter, the score of the most severe of the functional defects; y is the running condition parameter of the pipe section, the average value of the functional defect calculated according to the number of the defect points;
the functional defect density should be calculated as follows:
in the formula: y isM-pipe section functional defect density; l is the length of the pipe section; l isj1-a functional defect length with a longitudinal clear distance of more than 1.5 m; l isj2-a functional defect length with a longitudinal clear distance of more than 1.0m and not more than 1.5 m.
In general, when the value range of structural defect parameter F of the pipeline is F less than or equal to 3, the structural defect of the pipeline does not influence the use; when the value range of F is F & gt 3, the use is influenced by the defects of the pipeline structure. The structural defect density Sm < 0.1 is defined as a local defect, Sm < 0.1 > Sm < 0.6 is defined as a local or global defect, and Sm > 0.5 is defined as a global defect. When the value range of the functional defect parameter G is G less than or equal to 3, the operation of the pipeline is not greatly influenced; when the value range of G is G > 3, the operation of the pipeline is influenced. The functional defect density Ym < 0.1 is defined as a local defect, Ym < 0.1 is defined as a local or global defect, Ym > 0.5 is defined as a global defect.
Pre-classifying all pipe sections according to the calculation result, namely classifying F less than or equal to 3 as a general structural defect (a), and classifying F more than 3 as a serious structural defect (b); g.ltoreq.3 is classified as a general functional defect (a), and G > 3 is classified as a severe functional defect (b).
If a certain pipe section has structural defects and functional defects at the same time, the functional defects are ignored according to the consideration of the structural defects, because dredging the pipe belongs to a pretreatment link in the process of repairing the structural defects, and the functional defects can be repaired at the same time.
And performing weighted calculation on all the pipe sections under each classification, and performing overall evaluation on the structural defects, wherein the calculation formula is as follows:
inweighted by each pipe section, and
fn (x) is a structural defect parameter calculation value of the nth section of pipeline, and the calculation method is shown in technical regulation;
n is the number of the pipe sections, and if n is 10, the total number of the pipe sections under the classification is 10.
For the grouping classified as general structural defect (a), ZFa values and ZSma values were obtained; for the grouping classified as a severe structural defect (b), ZFb values and ZSmb values were obtained.
And in the same way, the functional defects are integrally evaluated:
inweighted by each pipe section, and
gn (x) is a calculated value of functional defect parameters of the nth section of pipeline, and the calculation method is shown in technical regulations;
and n is the number of the pipe sections.
Similarly, calculating to obtain ZGa, Zyma, ZGb and Zymb of the functional defect groups.
Further, for structural defects, the calculated ZFa value and ZFb value are respectively substituted into the pipeline overall repair index ZRI calculation formula:
ZRI＝0.7ZF+0.1K+0.05E+0.15T (3-1)
wherein:
ZRI-pipe segment repair index; k is the regional importance parameter; e-pipeline importance parameter; t-soil property influence parameter;
if the calculated integral repair index ZRI is less than or equal to 1, no repair is needed; if the value is more than or equal to 1 and less than or equal to ZRI and less than or equal to 4, only a repair plan is made without repairing in a short period; if 4 is less than ZRI, the repair measures should be taken as soon as possible;
further, comparing the calculated overall structure defect density ZSMa value and the overall structure defect density ZSMb value with 0.5, if the defect density ZSm is less than or equal to 0.5, the defect is a local structure defect and only needs local repair; if the defect density ZSm is greater than 0.5, the defect is a defect of the entire structure, and the entire structure needs to be repaired.
Similarly, for functional defects, the ZGa value and the ZGb value obtained by calculation are respectively substituted into a calculation formula of the overall maintenance index ZMI of the pipeline:
ZMI＝0.8ZG+0.1K+0.05E (4-1)
wherein:
ZMI-pipe section maintenance index; k is the regional importance parameter; e-pipeline importance parameter;
if the calculated overall curing index ZMI is less than or equal to 1, curing is not needed; if ZMI is more than or equal to 1 and less than or equal to 4, maintenance is not needed in a short period, and only a maintenance plan is made; if the ZMI is more than 4, the maintenance measures should be taken as soon as possible;
further, comparing the calculated overall functional defect density ZYma value and the overall functional defect density ZYmb value with 0.5, if the defect density ZYm is less than or equal to 0.5, the defect is a local functional defect and only needs local repair; if the defect density ZSm is greater than 0.5, the defect is an overall functional defect and needs to be repaired as a whole.
After the overall evaluation of the pipeline is completed, the results of whether the pipeline is repaired, partially repaired or integrally repaired and whether the pipeline is maintained, partially maintained or integrally maintained are obtained, and the next repair decision is made according to the results.
For pipelines needing to be repaired, at present, a plurality of pipeline trenchless repairing methods are commonly used in the industry, the application conditions are different, and for each pipeline trenchless repairing method, the method has the characteristics of high and low construction speed, suitability for pipes, suitability for local or integral repairing, mechanical floor area, engineering cost and the like. Accordingly, factors of construction period t, applicable pipe p, repair scale m and occupied area c4 are introduced, and an optimal repair method which is economic, reasonable and technically feasible is screened out from multiple repair methods by adopting a repair decision index function.
The repair decision index function is as follows:
J＝f(p,c,m,t)＝16p+5.4m1.52-0.5c-1.21t2 (5-1)
wherein, J-repair index; p is applicable pipe, when the repaired pipeline pipe belongs to the range of the pipe applicable to the repairing method, p is 1, otherwise p is 0; c-area occupied, unit m2Repairing the area of the motor vehicle lane occupied by mechanical equipment and the like; m-scale of repair, where m is 1 when the repair method is applicable to local repair, m is 2 when applicable to global repair, and m is 3 when both are applicable; t is the construction period, unit d, and working day required by unit length pipeline repair.
Further, substituting four factors of p, c, m and t of each repair method into a repair decision index function J ═ f (p, c, m and t) to obtain a repair decision index J, then sorting the repair indexes, and selecting the repair method sorted in the first three as an alternative repair method.
Furthermore, a project cost factor q is introduced, cost accounting is carried out on the 3 alternative repair methods, and finally one repair method with low cost is used as a selected repair method for guiding pipeline repair construction.
Through the trenchless pipeline defect repairing decision-making system, macroscopic understanding is generated on the structural defect and functional defect levels of large-scale pipelines, and pipeline repairing indexes and maintenance indexes are judged, so that the necessity of pipeline repairing is judged. Then, an economical, reasonable and technically feasible repair means is quickly selected through a repair decision model, and a decision maker can make a quick decision conveniently. The method is simple, scientific and efficient in decision-making on the pipeline trenchless repairing method, can save the construction period and labor, and has good economic benefit.
An example of the calculation is described below:
assuming that trenchless repair is required for a certain sewage pipeline project, the defect results are initially calculated according to the related formula of technical regulations according to the detection report and are shown in the following table:
and pre-classifying according to the size of the structural defect parameter F and the size of the functional defect G, wherein the classification result is as follows:
general structural defect (a): W1-W2, W7-W8, W11-W12
Severe structural defect (b): W5-W6, W13-W14, W17-W18
General functional deficiency (a): W3-W4, W16-W17
Severe functional defect (b): W9-W10, W15-W16
According to the classification result, the F, Sm values in the table are substituted into the formulas (1-1) and (1-2), the weight is assumed to be averaged, and the overall structural defect parameter and the defect density are calculated to obtain:
ZFa＝(3+2+3)/3＝2.68；ZSma＝(0.16+0.06+0.5)/3＝0.24
ZFb＝(5+6+4)/3＝5；ZSmb＝(0.03+0.3+0.2)/3＝0.17
similarly, substituting G, Ym values into equations (2-1), (2-2) assumes that the weights are averaged to give:
ZGa＝(2.5+2)/2＝2.25；ZYma＝(0.03+0.05)/2＝0.04
ZGb＝(5.5+4)/2＝4.75；ZYmb＝(0.08+0.2)/2＝0.14
substituting the calculation result into the overall repair index ZRI calculation formula:
ZRI(a)＝0.7×2.68+0.1×10+0.05×3+0.15×0＝3.026
ZRI(b)＝0.7×5+0.1×10+0.05×3+0.15×0＝4.65
judging that the general structural defects (a) are grouped according to the calculation result, ZRI (a) is less than 4, and the repair is not needed in a short period but a repair plan is needed; severity structural defects (b) group, zri (b) > 4, should be repaired as soon as possible. And the integral defect density Zmb is less than 0.5, and local repair should be performed.
Substituting the calculation result into an overall maintenance index ZMI calculation formula:
ZMI(a)＝0.8×2.25+0.1×10+0.05×3＝2.95
ZMI(b)＝0.8×4.75+0.1×10+0.05×3＝4.95
judging that the general functional defects (a) are grouped according to the calculation result, ZMI (a) is less than 4, and the repair is not needed in a short period, but a maintenance plan is needed; severity functional defects (b) group, zmi (b) > 4, should be repaired as soon as possible. And the integral defect density ZYmb is less than 0.5, and local maintenance is required.
In summary, the following steps: severe structural defect (b): W5-W6, W13-W14 and W17-W18 are grouped into pipe sections which need repair measures, and the serious functional defect (b): the grouped pipe sections W9-W10 and W15-W16 need maintenance measures.
The following takes the repair measures as an example for decision making:
the existing trenchless repairing method comprises three methods of repairing by a punctiform in-situ curing method, repairing by a stainless steel foaming cylinder, repairing by an SCL soft lining method of a pipeline, repairing a liner of a mechanical spiral pipe, repairing by a pull-in type ultraviolet in-situ curing method, repairing by a turnover type in-situ curing method, repairing by a stainless steel double expansion ring and repairing by a pipe splitting method, wherein the three methods with larger repairing indexes are selected from the three methods by substituting the construction period t, the applicable pipe p, the repairing scale m and the occupied area c of the method in the 8 into a repairing decision index function J ═ f (p, c, m and t), and the three methods are used as alternative schemes by calculating the repairing of the stainless steel foaming cylinder, repairing by the pipe splitting method and repairing by the punctiform in-situ curing method.
Then, the comprehensive unit prices of the three methods of stainless steel foaming cylinder repair, pipe cracking repair and point-like in-situ curing repair are compared, the cost factors q are 4500 yuan, 5500 yuan and 6000 yuan respectively, and finally the stainless steel foaming cylinder repair method is selected as the finally selected repair method through the necessary economical efficiency.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. A pipeline defect non-excavation repair decision-making method is characterized in that whether a pipeline to be repaired is repaired or not is determined according to an evaluation result of an integral evaluation model, and a pipeline non-excavation repair means is determined according to a result of a repair decision-making model; the specific method comprises the following steps:
and (3) overall evaluation model:
a1, obtaining detection results of each pipeline, wherein the detection results comprise the defect types and the defect scores of the pipelines;
a2, calculating a structural defect parameter F, a structural defect density value Sm, a functional defect parameter G and a functional defect density value Ym of each pipe section of the pipeline by using the defect score;
a3, setting a limit interval of a structural defect parameter F and a functional defect parameter G, and performing defect grade pre-classification on all pipe sections, wherein the classification comprises four types of general structural defects, serious structural defects, general functional defects and serious functional defects;
a4, substituting the F, G, Sm and Ym values of all single pipe sections under each classification into an overall evaluation function of structural defect parameters and functional defect parameters, and calculating a ZF value, a ZSm value, a ZG value and a ZYm value of the pipeline, wherein ZF represents the overall structural defect parameters of the pipeline, ZSm represents the overall structural defect density value of the pipeline, ZG represents the overall functional defect parameters of the pipeline, and ZYm represents the overall functional defect density value of the pipeline;
a5, utilizing an evaluation table of comparison of ZF values, ZSm values, ZG values and ZYm values with corresponding indexes to perform overall evaluation on the four types of defective pipeline defects and determine whether to repair the defects wholly or locally; whether to perform maintenance, overall or local maintenance;
repairing the decision model:
b1, introducing 5 influencing factors, including: construction period t, applicable pipe p, repair scale m, occupied area c and construction cost q;
b2, simultaneously substituting 4 corresponding influence factors of the repair method, such as construction period t, applicable pipe p, repair scale m and occupied area c, into a repair decision index function for each repair method, respectively calculating to obtain corresponding decision indexes J, and calculating the first three items with larger final values according to the decision indexes J to serve as alternative repair methods;
and B3, carrying out project cost q influence factor accounting on the obtained three alternative repairing methods, and taking a repairing method with the lowest comprehensive cost as a finally selected repairing method.
2. The method for decision-making for trenchless rehabilitation of pipe defects according to claim 1, wherein the method for calculating the structural defect parameter F, the structural defect density value Sm, the functional defect parameter G and the functional defect density value Ym of each pipe section in the step a2 specifically comprises:
the structural defect parameters of the pipe section are calculated according to the following formula:
when S ismaxWhen S is greater than or equal to F ═ Smax
When S ismaxIf < S, F ═ S
In the formula: f, structural defect parameters of the pipe section; smax-a pipe segment damage status parameter, a score of the most damaged part of the structural defects of the pipe segment; s, calculating the average value of the pipe section damage condition parameters according to the number of defect points;
the structural defect density should be calculated as follows:
in the formula: sM-pipe segment structural defect density; l is the length of the pipe section in m; l isi1-structural defect length in m with a longitudinal clear distance greater than 1.5 m; l isi2-a structural defect length in m with a longitudinal clear distance greater than 1.0m and not greater than 1.5 m;
the functional defect parameters of the pipe section are calculated according to the following formula:
when Y ismaxWhen Y is greater than or equal to G ═ GYmax
When Y ismaxWhen < Y, G ═ Y
In the formula: g, functional defect parameters of the pipe section; y ismax-a pipe section operating condition parameter, the score of the most severe of the functional defects; y is the running condition parameter of the pipe section, the average value of the functional defect calculated according to the number of the defect points;
the functional defect density should be calculated as follows:
in the formula: y isM-pipe section functional defect density; l is the length of the pipe section; l isj1-a functional defect length with a longitudinal clear distance of more than 1.5 m; l isj2-a functional defect length with a longitudinal clear distance of more than 1.0m and not more than 1.5 m.
3. The trenchless pipeline defect repairing decision method according to claim 1, wherein the method for pre-classifying the defect grades of all the pipeline sections by setting the boundary interval in the step a3 specifically comprises the following steps:
when the value range of the structural defect parameter F of the pipeline is F less than or equal to 3, the structural defect of the pipeline does not influence the use; when the value range of F is more than 3, the use is influenced by the structural defects of the pipeline; when the value range of the functional defect parameter G is G less than or equal to 3, the operation of the pipeline is not greatly influenced; when the value range of G is G > 3, the operation of the pipeline is influenced;
pre-classifying all pipe sections according to the calculation result, namely classifying F less than or equal to 3 as a general structural defect, and classifying F more than 3 as a serious structural defect; g is less than or equal to 3 and is classified as general functional defect, and G is more than 3 and is classified as serious functional defect;
if a pipe section has both structural defects and functional defects, the functional defects are ignored according to the structural defects.
4. The method for decision-making for trenchless restoration of pipe defects according to claim 1, wherein the method for calculating the overall evaluation function of the structural defect parameters and the functional defect parameters in the step a4 comprises:
and performing weighted calculation on all the pipe sections under each classification, and performing overall evaluation on the structural defects, wherein the calculation formula is as follows:
wherein inWeighted by each pipe section, and
fn (x) is a structural defect parameter calculation value of the nth section of pipeline; n is the number of the pipe sections;
and performing overall evaluation on the functional defects, wherein the calculation formula is as follows:
wherein inWeighted by each pipe section, and
gn (x) is a calculated value of the functional defect parameter of the nth section of the pipeline; and n is the number of the pipe sections.
5. The trenchless pipe defect repair decision method according to claim 4, wherein in the step A5, if the pipe defect is a structural defect, the evaluation method specifically comprises:
calculating ZF value and ZSm value of the structural defect;
substituting the calculated ZF value into a calculation formula of the integral pipeline repair index ZRI:
ZRI＝0.7ZF+0.1K+0.05E+0.15T
wherein ZRI is the pipe segment repair index; k is an area importance parameter; e is a pipeline importance parameter; t is a soil property influence parameter;
if the calculated integral repair index ZRI is less than or equal to 1, no repair is needed; if the value is more than or equal to 1 and less than or equal to ZRI and less than or equal to 4, only a repair plan is made without repairing in a short period; if 4 is less than ZRI, the repair measures should be taken as soon as possible;
further, comparing the calculated integral structure defect density ZSm value with 0.5, if the defect density ZSm is less than or equal to 0.5, the defect is a local structure defect, and only local repair is needed; if the defect density ZSm is greater than 0.5, the defect is a defect of the entire structure, and the entire structure needs to be repaired.
6. The method for decision-making for trenchless rehabilitation of pipe defects according to claim 4, wherein in the step A5, if the pipe defects are functional defects, the evaluation method comprises:
for functional defects, calculating ZG values and ZYm values;
substituting the calculated ZG value into a calculation formula of the overall maintenance index ZMI of the pipeline:
ZMI＝0.8ZG+0.1K+0.05E
wherein ZMI is a pipe section maintenance index; k is an area importance parameter; e is a pipeline importance parameter;
if the calculated overall curing index ZMI is less than or equal to 1, curing is not needed; if ZMI is more than or equal to 1 and less than or equal to 4, maintenance is not needed in a short period, and only a maintenance plan is made; if the ZMI is more than 4, the maintenance measures should be taken as soon as possible;
comparing the calculated value of the integral functional defect density ZYm with 0.5, and if the defect density ZYm is less than or equal to 0.5, determining that the defect is a local functional defect and only needing local repair; if the defect density ZSm is greater than 0.5, the defect is an overall functional defect and needs to be repaired as a whole.
7. The trenchless pipeline defect repair decision method according to claim 1, wherein the repair decision index function in the step B2 is specifically:
the repair decision index function is as follows:
J＝f(p,c,m,t)＝16p+5.4m1.52-0.5c-1.21t2
wherein, J-repair index; p is applicable pipe, when the repaired pipeline pipe belongs to the range of the pipe applicable to the repairing method, p is 1, otherwise p is 0; c-area occupied, unit m2Repairing the area of the motor vehicle lane occupied by mechanical equipment and the like; m-scale of repair, where m is 1 when the repair method is applicable to local repair, m is 2 when applicable to global repair, and m is 3 when both are applicable; t is the construction period, unit d, and working day required by unit length pipeline repair.
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