CN112116190A - Improvement method for evaluating technical condition of asphalt pavement of urban road - Google Patents
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Abstract
An improved method for evaluating the technical condition of an asphalt pavement of an urban road comprises the following steps: t × ω according to the formula PQI1×RQI+ω2×PCI+ω3×RDI+ω4Obtaining a comprehensive evaluation index PQI of the pavement by multiplying SRI: in the formula: the PQI value range is 0-100; t is the RQI score conversion coefficient, and 20 is taken; omega1、ω2Respectively are the weight of RQI and PCI; RDI is a road rut depth index; SRI is the road surface anti-skid performance index; omega3、ω4The weights of RDI and SRI are respectively; comprehensively evaluating the bearing capacity of the pavement structure by calculating the ratio SSI of the pavement deflection design value to the pavement actual measurement deflection representative value and evaluating the core sample strength index CSI; dividing the whole detected road into several section sections, aiming at distribution condition of different road surface condition index PCI value of each sectionAnd adjusting and calculating the PCI value according to a continuous level algorithm and a discontinuous level algorithm respectively. The comprehensive technical condition of the asphalt pavement of the urban road can be more comprehensively evaluated by using the method.
Description
The technical field is as follows:
the invention relates to the technical field of road engineering, in particular to an improvement method for evaluating the technical condition of an asphalt pavement of an urban road.
Background art:
in the technical specification of urban road maintenance (CJJ36-2016), the evaluation contents of the technical condition of the asphalt pavement of the urban road comprise the road running quality, the road damage condition, the road structural strength, the road skid resistance and comprehensive evaluation, namely, the single evaluation and the comprehensive evaluation are carried out from the aspects of comfort, functionality, structural bearing capacity and safety, and the corresponding evaluation indexes are a road running quality index RQI, a road condition index PCI, a structural strength index SSI, a road skid resistance index SRI and a road comprehensive evaluation index PQI. While the calculation of PQI is based only on the weighted sum of RQI and PCI, the determination of the two index weights is fixed according to the grade of the urban road.
The comprehensive evaluation method provided by the specification is simple to operate and clear in practical significance, but has the following problems:
1. the road surface comprehensive evaluation index PQI is calculated by a simple evaluation standard, and is obtained by only carrying out weighted average on the road surface running quality index RQI and the road surface condition index PCI, and the influence of other factors such as the road surface skid resistance, the road surface rutting and the like in the comprehensive evaluation is not fully considered.
2. The calculation of the comprehensive evaluation index PQI of the road surface on the weight is only based on the urban road grade by adopting a fixed weight, and the real situation is difficult to reflect due to the lack of basis.
3. In the calculation of the structural strength index SSI, whether the current road surface structure bearing capacity can continuously meet the current traffic volume is evaluated by simply utilizing the road surface rebound deflection value, and the evaluation method is too single and is not strict and scientific.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an improved method for evaluating the technical condition of the asphalt pavement of the urban road, and the comprehensive technical condition of the asphalt pavement of the urban road can be more comprehensively evaluated by using the method.
As conceived above, the technical scheme of the invention is as follows: an improvement method for evaluating the technical condition of an urban road asphalt pavement is characterized by comprising the following steps: the method comprises the following steps:
obtaining a road surface comprehensive evaluation index PQI according to the following formula:
PQI＝T×ω1×RQI+ω2×PCI+ω3×RDI+ω4×SRI
in the formula: the PQI value range is 0-100; t is the RQI score conversion coefficient, and 20 is taken; omega1、ω2Respectively are the weight of RQI and PCI; RDI is a road rut depth index; SRI is the road surface anti-skid performance index; omega3、ω4The weights of RDI and SRI are respectively;
RDI is calculated according to the following formula:
in the formula: RD is a representative value (mm) of the rut depth within the evaluation section; RDa is a rut depth parameter, and 10.0 is taken; RDb is a rut depth parameter, 40.0 is selected; a is0Taking 1.0 as a model parameter; a is1Taking 3.0 as a model parameter;
the SRI is calculated according to the following formula:
in the formula: SFC is the transverse force coefficient, SRIminTaking 35.0 as a calibration parameter; a is0Taking 28.6 as a model parameter; a is1Taking-0.105 as a model parameter;
evaluating the bearing capacity of the pavement structure:
a. according to the formula SSI ═ ld/l0Calculating a road surface structural strength index SSI, namely the ratio of a road surface deflection design value to a road surface actual measurement deflection representative value, wherein: ldA design value for road deflection (0.01 mm); l0The measured deflection representative value (0.01mm) of the road surface is obtained; ldCan be calculated according to the relevant regulations of the urban road pavement design Specification (CJJ 169-;
b. evaluation of core strength index CSI:
adopting a fuzzy theory, obtaining qualitative evaluation through observation and description of a core sample, and quantifying the qualitative evaluation into the strength of the core sample by a two-pole proportion method proposed by Mackerem, wherein a transformation method is shown in figure 1;
adjusting the road surface condition index PCI: dividing the whole detected road into a plurality of subsection intervals, and adjusting and calculating the PCI value according to a continuous level algorithm and a discontinuous level algorithm respectively according to the distribution condition of the PCI value of different pavement condition indexes of each interval.
Further, omega in the step (i)1、ω2、ω3、ω4The weight determination method comprises the following steps:
(1) when the PCI value influence is dominant, if PCI is not less than (RQI + RDI + SRI)/3, the weight shown in the following table is adopted:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.35 | 0.40 |
| ω2(PCI index) | 0.45 | 0.60 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.10 | 0.00 |
(2) When RQI, RDI, SRI values affect predominantly, if PCI < (RQI + RDI + SRI)/3, the weights shown in the following table are used:
if PCI is greater than 0.8 (RQI + RDI + SRI)/3, the following method is adopted to calculate each weight:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.65 | 0.75 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.10 | 0.00 |
(ii) if 0.5 (RQI + RDI + SRI)/3 < PCI < 0.8 (RQI + RDI + SRI)/3, the weights shown in the following table are used:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.70 | 0.75 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.05 | 0.00 |
(iii) if PCI < 0.5 (RQI + RDI + SRI)/3, using the weights shown in the following table:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.75 | 0.75 |
| ω3(RDI index) | 0.05 | 0.00 |
| ω4(SRI index) | 0.05 | 0.00 |
Further, the above SSI evaluation criteria are as follows:
| rating of evaluation | Superior food | Good wine | In | Difference (D) |
| Express way/main road | [1.00,1.50) | [0.82,1.00) | [0.66,0.82) | [0,0.66) |
| Secondary trunk/branch | [0.82,1.30) | [0.66,0.83) | [0.50,0.66) | [0,0.50) |
Further, the evaluation criteria of the core strength index CSI are as follows:
| rating of evaluation | Strength of core sample |
| Superior food | [7,10] |
| Good wine | [5,7) |
| In | [3,5) |
| Difference (D) | [0,3) |
Further, the specific method of the continuous algorithm in the third step is as follows:
according to the PCI value of each subsection interval of the asphalt pavement of the urban road, the following conditions are divided:
firstly, if the PCI values of all intervals are more than 90, simply adding and averaging;
if 80-90 and more than 90 2 gears appear in the PCI values of all the intervals, independently calculating 80-90 gears, averaging and then multiplying by the weight of 0.5, independently calculating more than 90 gears, and averaging and then multiplying by the weight of 0.5;
thirdly, if more than 3 grades of PCI values of 70-80, 80-90 and 90 occur in all intervals at the same time, multiplying the 3 grades by the weights of 0.45, 0.3 and 0.25 respectively;
if more than 4 gears of 60-70, 70-80, 80-90 and 90 appear in the PCI values of all the intervals, multiplying the 4 gears by the weight of 0.45, 0.3, 0.15 and 0.1 respectively;
if there are 5 stages with PCI values below 60, 60-70, 70-80, 80-90, 90 or above, these 5 stages are multiplied by the weight of 0.45, 0.25, 0.1, respectively.
Further, the specific method of the continuous algorithm in the third step is as follows:
if any 4 discontinuous gears appear in the PCI values of all the intervals, the decisive factor is the gear with low score, and each gear can be multiplied by the weight of 0.45, 0.3, 0.15 and 0.1 from low to high according to the score;
if any 3 grades appear in the PCI values of all the intervals, the principle method is that firstly, the weights of 0.45, 0.3 and 0.25 can be multiplied according to the grades from low to high;
thirdly, if any 2 gears appear in the PCI values of all the intervals, each gear can be multiplied by the weight of 0.65 and 0.35 respectively from low to high according to the value.
The invention has the following advantages and positive effects:
1. in the calculation of the comprehensive road evaluation index PQI, the related specifications of the road are referred, the road rutting depth index RDI and the road skid resistance index SRI are increased, and the technical condition of the road is evaluated more comprehensively.
2. In the aspect of evaluating the structural bearing capacity, the core sample strength index CSI is added, and the pavement structural strength index SSI is combined to perform double-standard evaluation, so that the accuracy of an evaluation result is improved.
3. The whole detected road is divided into a plurality of subsection sections (the maximum subsection section is 1-2 km), and the PCI value is adjusted and calculated according to a continuous level algorithm and a discontinuous level algorithm respectively according to the distribution condition of different pavement condition index PCI values of each section.
4. When the comprehensive evaluation index PQI of the pavement is calculated, a set of weighting algorithm is set according to the relation between the PCI and other 3 indexes RQI, RDI and SRI, and the final PQI calculation result can highlight the influence of diseases and the severity of potential risks in a floating weighting mode, so that a more reasonable evaluation result is obtained.
Drawings
FIG. 1 is a schematic representation of the transformation method to quantify qualitative assessments as core sample strengths by the two-pole scaling method proposed by McCramer.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following examples are illustrated in detail:
an improved method for evaluating the technical condition of an asphalt pavement of an urban road comprises the following steps:
1. calculation improvement of road surface comprehensive evaluation index PQI
In Town road maintenance Specification (CJJ36-2016), PQI was calculated as shown in equation 1.
PQI＝T×ω1×RQI+ω2xPCI (formula 1)
In the formula: the PQI value range is 0-100; t is the RQI score conversion coefficient, and 20 is taken; omega1、ω2Respectively are the weight of RQI and PCI; for express way or main road, omega1Value of 0.6, omega2The value is 0.4; for secondary trunk or branch, omega1Value of 0.4, omega2The value is 0.6.
In the actual maintenance decision work, the comprehensive evaluation of the technical condition of the asphalt pavement of the urban road is obtained by only performing weighted average by adopting RQI and PCI, and is incomplete. In the scheme, by referring to 'road technical condition evaluation standards' (JTG 5210-2018), a road rutting depth index RDI and a road skid resistance index SRI are increased, and calculation of PQI is improved, so that the comprehensive technical condition of the urban road asphalt pavement is more comprehensively evaluated. The specific formula is shown in formula 2.
PQI＝T×ω1×RQI+ω2×PCI+ω3×RDI+ω4XSRI (formula 2)
In the formula: the PQI value range is 0-100; t is the RQI score conversion coefficient, and 20 is taken; omega1、ω2Respectively are the weight of RQI and PCI; RDI is a road rut depth index; SRI is the road surface anti-skid performance index; omega3、ω4The weights of RDI and SRI, respectively.
RDI should be calculated as in equation 3:
in the formula: RD is a representative value (mm) of the rut depth within the evaluation section; RDa is a rut depth parameter, and 10.0 is taken; RDb is a rut depth parameter, 40.0 is selected; a is0Taking 1.0 as a model parameter; a is1For the model parameters, 3.0 was taken.
SRI should be calculated as equation 4:
in the formula: SFC is the transverse force coefficient, SRIminTaking 35.0 as a calibration parameter; a is0Taking 28.6 as a model parameter; a is1As a model parameter, take-0.105.
ω1、ω2、ω3、ω4The determination of the weights is described in detail below.
ω in PQI calculation1、ω2、ω3、ω4The weight determination method comprises the following steps:
in order to comprehensively consider the influence weight of each index in PQI calculation, a set of weight algorithm is designed according to the relation between PCI and other 3 indexes, and the method is as follows.
(1) When the PCI value influence is dominant, if PCI is not less than (RQI + RDI + SRI)/3, the weight shown in the following table is adopted:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.35 | 0.40 |
| ω2(PCI index) | 0.45 | 0.60 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.10 | 0.00 |
(2) When other values affect the dominant situation,
if PCI < (RQI + RDI + SRI)/3, the algorithm is changed to highlight the influence of the road quality on the whole road condition, which is specifically as follows.
If PCI > 0.8 (RQI + RDI + SRI)/3, the weights shown in the following table are used:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.65 | 0.75 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.10 | 0.00 |
(ii) if 0.5 (RQI + RDI + SRI)/3 < PCI < 0.8 (RQI + RDI + SRI)/3, the weights shown in the following table are used:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.70 | 0.75 |
| ω3(RDI index) | 0.10 | 0.00 |
| ω4(SRI index) | 0.05 | 0.00 |
(iii) if PCI < 0.5 (RQI + RDI + SRI)/3, using the weights shown in the following table:
| weight of | Expressway and main road | Secondary trunk and branch |
| ω1(RQI index) | 0.15 | 0.25 |
| ω2(PCI index) | 0.75 | 0.75 |
| ω3(RDI index) | 0.05 | 0.00 |
| ω4(SRI index) | 0.05 | 0.00 |
2. Evaluation of bearing capacity of pavement structure
In the technical Specification for urban road maintenance (CJJ36-2016), the road surface rebound deflection value of an asphalt road surface is generally used as an evaluation index of the road surface structural strength, and the evaluation is carried out independently without participating in the calculation of a road surface comprehensive evaluation index PQI. However, a large amount of engineering experience verifies that the evaluation method is not objective and rigorous, and for some road sections with large deflection values, core drilling and sampling find that the base layer structure is relatively complete except that the surface layer part is damaged, while for some road sections with small deflection values, some base layers are seriously damaged, and individual core samples are even difficult to form. Therefore, in the evaluation of the bearing capacity of the asphalt pavement structure, the index of the core sample Strength index CSI (core Strength index) is considered to be increased, and the double-standard evaluation is carried out by combining the pavement structure Strength index SSI so as to increase the accuracy of the evaluation result. The specific index calculation method and evaluation criteria are as follows.
(1) Road surface structural strength index SSI
SSI is a relative index that is a ratio of a design value of road surface deflection and a representative value of measured road surface deflection, and can clearly reflect the degree of deviation of the current deflection from the design deflection. SSI should be calculated as equation 5:
SSI＝ld/l0(formula 5)
In the formula: ldA design value for road deflection (0.01 mm); l0The measured deflection representative value (0.01mm) of the road surface was obtained. ldThe calculation can be carried out according to the relevant regulations of the urban road pavement design Specification (CJJ 169-2012).
The evaluation criteria for SSI are as follows:
| rating of evaluation | Superior food | Good wine | In | Difference (D) |
| Express way/main road | [1.00,1.50) | [0.82,1.00) | [0.66,0.82) | [0,0.66) |
| Secondary trunk/branch | [0.82,1.30) | [0.66,0.83) | [0.50,0.66) | [0,0.50) |
If the grade is excellent, an upper limit value is set in combination with the actual situation for evaluation, and if the sample data is greater than the upper limit value, the upper limit value is set.
(2) Core sample Strength index CSI
The CSI is a qualitative and quantitative index, when a core drilling method is adopted for evaluation, a region with large deflection or large pavement crack area is generally selected in an evaluation road section for drilling a core sample, and the strength of the core sample cannot be measured by a laboratory method due to the fact that part of the core sample in the region is damaged or most of the core sample cannot be formed, so that a fuzzy theory is introduced in the scheme, qualitative evaluation is obtained through observation and description of the core sample, then the qualitative evaluation is quantized into the strength of the core sample by a dipolar proportion method provided by Mackerem, a conversion method is shown in an attached figure 1, and the structural strength of the pavement can be more visually known through the method, so that the evaluation result is more accurate.
The evaluation criteria for the core strength index CSI are as follows:
| rating of evaluation | Strength of core sample |
| Superior food | [7,10] |
| Good wine | [5,7) |
| In | [3,5) |
| Difference (D) | [0,3) |
(3) Comprehensive evaluation of road surface structure bearing capacity
And performing comprehensive evaluation by using a pavement structure strength index SSI and a core sample strength index CSI for dual evaluation, and taking the lower one of the two index evaluation grades as a final evaluation grade. Therefore, whether the structural strength of the asphalt pavement can continuously meet the current traffic requirement or not is comprehensively determined by combining deflection detection and core drilling detection, and a basis is provided for whether the asphalt pavement needs major and middle repair treatment or not.
3. Adjustment calculation of road surface condition index PCI
When calculating the PCI value of the whole detected road section, aiming at the problem that the calculation method in the existing standard can not accurately reflect the damage degree of the road surface in the cell, the following continuous level algorithm and discontinuous level algorithm are respectively provided according to the distribution condition of different PCI values in different subsection intervals.
(1) Successive level algorithm
According to the PCI value of each subsection interval of the asphalt pavement of the urban road, the following conditions are divided.
Firstly, if the PCI values of all the intervals are more than 90, the algorithm is not changed, and the addition and the average are simply carried out.
And secondly, if 80-90 and more than 90 gears 2 appear in the PCI values of all the intervals, calculating 80-90 gears independently, multiplying the average by the weight of 0.5, calculating more than 90 gears independently, and multiplying the average by the weight of 0.5.
Thirdly, if more than 3 gears of 70-80, 80-90 and 90 occur in the PCI values of all the intervals, the severity of the gear of 70-80 needs to be highlighted on the basis of average calculation of each gear, and the influence of the other 2 gears cannot be denied. Therefore, these 3 gears are multiplied by weights of 0.45, 0.3, and 0.25, respectively.
If there are 4 grades of PCI values of 60-70, 70-80, 80-90, 90 or more in all the intervals, the severity of the grade should be highlighted because 60-70 belongs to the grade requiring major repair, and the influence weight is slightly smaller in the rest 3 grades because the severity of the problem is small. In summary, these 4 gears are multiplied by weights of 0.45, 0.3, 0.15, and 0.1, respectively.
Fifthly, if less than 60, 60 to 70, 70 to 80, 80 to 90 and more than 90 grades of 5 grades appear in the PCI values of all the intervals, the grade less than 60 belongs to the road section which is in urgent need of maintenance, the influence on the whole road surface technical condition is the most obvious, the grade 60 to 70 has the second influence on the road surface technical condition, and the other grades 3 have small severity of problems, so the influence weight is slightly small. In summary, these 5 gears are multiplied by weights of 0.45, 0.25, 0.1, and 0.1, respectively.
(2) Interval level algorithm
When the PCI value difference in each section interval of the asphalt pavement is large, the following algorithm is adopted.
If any 4 grades (discontinuity) appear in the PCI values of all the intervals, the decisive factor is the grade with lower score, and each grade can be multiplied by the weight of 0.45, 0.3, 0.15 and 0.1 according to the score from low to high.
If any 3 grades appear in the PCI values of all the intervals, the weights of 0.45, 0.3 and 0.25 can be multiplied according to the grades from low to high in principle.
And thirdly, if any 2 gears appear in the PCI values of all the intervals, the effect of the low gear is larger, but the effect of the high gear cannot be ignored, and in the conservative interest, each gear can be multiplied by the weights of 0.65 and 0.35 from low to high according to the values.
Through the two newly determined weight algorithms, the PCI value of the whole detected road section can be calculated, and whether the road needs to be refitted and the required refitting degree can be more clearly described.
The above embodiments are not intended to limit the present invention, and modifications and equivalent variations made by those skilled in the art based on the spirit of the present invention are within the technical scope of the present invention.
Claims (6)
1. An improvement method for evaluating the technical condition of an urban road asphalt pavement is characterized by comprising the following steps: the method comprises the following steps:
obtaining a road surface comprehensive evaluation index PQI according to the following formula:
PQI＝T×ω1×RQI+ω2×PCI+ω3×RDI+ω4×SRI
in the formula: the PQI value range is 0-100; t is the RQI score conversion coefficient, and 20 is taken; omega1、ω2Respectively are the weight of RQI and PCI; RDI is a road rut depth index; SRI is the road surface anti-skid performance index; omega3、ω4The weights of RDI and SRI are respectively;
RDI is calculated according to the following formula:
in the formula: RD is a representative value (mm) of the rut depth within the evaluation section; RDa is rut depthTaking 10.0 as a parameter; RDb is a rut depth parameter, 40.0 is selected; a is0Taking 1.0 as a model parameter; a is1Taking 3.0 as a model parameter;
the SRI is calculated according to the following formula:
in the formula: SFC is the transverse force coefficient, SRIminTaking 35.0 as a calibration parameter; a is0Taking 28.6 as a model parameter; a is1Taking-0.105 as a model parameter;
evaluating the bearing capacity of the pavement structure:
a. according to the formula SSI ═ ld/l0Calculating a road surface structural strength index SSI, namely the ratio of a road surface deflection design value to a road surface actual measurement deflection representative value, wherein: ldA design value for road deflection (0.01 mm); l0The measured deflection representative value (0.01mm) of the road surface is obtained; ldCan be calculated according to the relevant regulations of the urban road pavement design Specification (CJJ 169-;
b. evaluation of core strength index CSI:
adopting a fuzzy theory, obtaining qualitative evaluation through observation and description of a core sample, and quantifying the qualitative evaluation into the strength of the core sample by a two-pole proportion method proposed by Mackerem, wherein a transformation method is shown in figure 1;
adjusting the road surface condition index PCI: dividing the whole detected road into a plurality of subsection intervals, and adjusting and calculating the PCI value according to a continuous level algorithm and a discontinuous level algorithm respectively according to the distribution condition of the PCI value of different pavement condition indexes of each interval.
2. The improvement method for the technical condition evaluation of the asphalt pavement of the urban road according to claim 1, characterized in that: omega in the above step1、ω2、ω3、ω4The weight determination method comprises the following steps:
(1) when the PCI value influence is dominant, if the PCI is not less than (RQI + RDI + SRI)/3, the weight shown in the following table is adopted:
(2) When the RQI, RDI, SRI values affect predominantly, if PCI < (RQI + RDI + SRI)/3, the weights shown in the following table are used:
if PCI > 0.8 (RQI + RDI + SRI)/3, the weights shown in the following table are used. :
(ii) if 0.5 (RQI + RDI + SRI)/3 < PCI < 0.8 (RQI + RDI + SRI)/3, the weights shown in the following table are used:
(iii) if PCI < 0.5 (RQI + RDI + SRI)/3, using the weights shown in the following table:
3. the improvement method for the technical condition evaluation of the asphalt pavement of the urban road according to claim 1, characterized in that: the above SSI evaluation criteria are as follows:
4. The improvement method for the technical condition evaluation of the asphalt pavement of the urban road according to claim 1, characterized in that: the evaluation criteria for the core strength index CSI are as follows:
5. The improvement method for the technical condition evaluation of the asphalt pavement of the urban road according to claim 1, characterized in that: the concrete method of the continuous algorithm in the third step is as follows:
according to the PCI value of each subsection interval of the asphalt pavement of the urban road, the following conditions are divided:
firstly, if the PCI values of all intervals are more than 90, simply adding and averaging;
if 80-90 and more than 90 2 gears appear in the PCI values of all the intervals, independently calculating 80-90 gears, averaging and then multiplying by the weight of 0.5, independently calculating more than 90 gears, and averaging and then multiplying by the weight of 0.5;
thirdly, if more than 3 grades of PCI values of 70-80, 80-90 and 90 occur in all intervals at the same time, multiplying the 3 grades by the weights of 0.45, 0.3 and 0.25 respectively;
if more than 4 gears of 60-70, 70-80, 80-90 and 90 appear in the PCI values of all the intervals, multiplying the 4 gears by the weight of 0.45, 0.3, 0.15 and 0.1 respectively;
if there are 5 stages of below 60, 60-70, 70-80, 80-90, and above 90 in PCI value of all sections, these 5 stages are multiplied by weight of 0.45, 0.25, 0.1, and 0.1, respectively.
6. The improvement method for the technical condition evaluation of the asphalt pavement of the urban road according to claim 1, characterized in that: the concrete method of the continuous algorithm in the third step is as follows:
if any 4 discontinuous gears appear in the PCI values of all the intervals, the decisive factor is the gear with low score, and each gear can be multiplied by the weight of 0.45, 0.3, 0.15 and 0.1 from low to high according to the score;
if any 3 grades appear in the PCI values of all the intervals, the principle method is that firstly, the weights of 0.45, 0.3 and 0.25 can be multiplied according to the grades from low to high;
thirdly, if any 2 gears appear in the PCI values of all the intervals, each gear can be multiplied by the weight of 0.65 and 0.35 respectively from low to high according to the value.
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