CN108595879B - Method for improving pavement construction flatness - Google Patents
Method for improving pavement construction flatness Download PDFInfo
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- CN108595879B CN108595879B CN201810436665.5A CN201810436665A CN108595879B CN 108595879 B CN108595879 B CN 108595879B CN 201810436665 A CN201810436665 A CN 201810436665A CN 108595879 B CN108595879 B CN 108595879B
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Abstract
The invention discloses a method for improving the construction flatness of a road surface, which can obtain a target virtual pavement coefficient that the pavement flatness and the pavement flatness are in a balanced state by measuring the lower bearing layer flatness and the pavement flatness in the road engineering which adopts a paver to carry out mechanical construction. And the actual measurement virtual paving coefficient can be obtained by measuring the virtual paving thickness and the compaction thickness of the paving layer. Because the closer the actual measurement virtual paving coefficient of the paving layer is to the target virtual paving coefficient, the better the flatness of the rolling forming surface is, when the actual measurement virtual paving coefficient of the paving layer is greatly different from the target virtual paving coefficient, the vibration frequency of the paver is adjusted until the adjusted actual measurement virtual paving coefficient is close to the target virtual paving coefficient, so that the flatness of the rolling forming road surface is improved, and the improvement of the performance of the road surface is facilitated.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a method for improving the flatness of pavement construction.
Background
In the technical specification of highway base construction, the once paving thickness of a cement stable mixture base is not more than 0.2m, and a structural layer with the thickness larger than the once paving thickness is constructed in a layered paving and rolling mode. Because interface effect or pollution phenomenon exists between every layer of water stability in the layered construction, each layer becomes an independent separation plate body, and the difference between the stress state of the bottom of the base layer and the elastic continuous design theory is larger.
In order to improve the construction quality of the base layer, a large-thickness paving process can be adopted to reduce the number of structural layers, improve the structural integrity of the pavement and improve the stress state of the bottom of the base layer. The large-thickness paving can obviously improve the construction quality of the cement stabilized base, but the control of the construction flatness becomes a technical difficulty.
The construction flatness has close relation with the service performance and the operation cost of the pavement, the construction flatness is low, the durability and the service life of the pavement can be influenced after the vehicle is communicated, and the performance of the pavement can be obviously improved by improving the construction flatness. The technical specifications of a plurality of countries in the world provide specific index requirements for the planeness of road surface construction, and the planeness (3m ruler) of the base layer of the expressway and the first-level highway is not more than 8mm and the planeness (3m ruler) of other grades of highways is not more than 12mm in the 'quality inspection and assessment Standard for Highway engineering' JTG F80/1-2004 in China; and the American standard AASHTO 2002 design guide takes the design as a design checking index.
Therefore, the improvement of the construction flatness of the cement stable mixture base layer with large thickness or non-large thickness has important significance for ensuring the pavement quality and reducing the operation cost.
Disclosure of Invention
The invention aims to provide a method for improving the construction flatness of a pavement, which solves the problem of low construction flatness in the prior art, and can improve the flatness of the pavement so as to improve the performance of the pavement.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for improving the construction flatness of a pavement, which comprises the following steps:
step 1): measuring flatness Delta H of lower bearing layer01And spreading layer flatness Delta H02；
Step 2): calculating a target virtual paving coefficient K of the spreading layer when the flatness of the lower bearing layer and the flatness of the spreading layer are in a balanced state:
step 3): measuring the virtual paving thickness of the paving layer, measuring the compacted thickness of the compacted and molded paving layer at the same point, and calculating the actual measurement virtual paving coefficient of the paving layer, wherein the actual measurement virtual paving coefficient of the paving layer is the ratio of the virtual paving thickness of the paving layer to the compacted thickness of the paving layer;
step 4): when the actually measured virtual paving coefficient is close to the target virtual paving coefficient, continuous paving operation is carried out;
when the actual measurement virtual paving coefficient is larger than the target virtual paving coefficient, increasing the vibration frequency of the paver, so as to reduce the actual measurement virtual paving coefficient of the paving layer, and performing the step 5);
when the actual measurement virtual paving coefficient is smaller than the target virtual paving coefficient, reducing the vibration frequency of the paver, so as to improve the actual measurement virtual paving coefficient of the paving layer, and performing the step 5);
step 5): measuring the virtual paving thickness of the paving layer again, measuring the compacted thickness of the compacted and molded paving layer at the same point, and calculating the adjusted actual measurement virtual paving coefficient;
when the adjusted actual measurement virtual paving coefficient is close to the target virtual paving coefficient, continuous paving operation is carried out; otherwise, repeating the step 4) to the step 5) until the adjusted actually measured virtual paving coefficient is close to the target virtual paving coefficient.
Furthermore, the invention is characterized in that:
the step 1) specifically comprises the following steps:
step 1.1): measuring the flatness Delta H of the lower bearing layer waiting for paving01And calculating the flatness Delta H of the molding surface determined by the flatness of the lower bearing layer according to the formula (1)1：
△H1＝(1-1/K)△H01 (1)；
Step 1.2): measuring the flatness delta H of the paved layer which is paved and not rolled02And calculating the flatness delta H of the molding surface determined by the flatness of the spreading layer according to the formula (2)2；
△H2＝(1/K)△H02 (2)。
The step 2) specifically comprises the following steps:
when Δ H1＝ΔH2During this time, the influence of the flatness of the lower bearing layer and the flatness of the spreading layer on the flatness of the forming surface is equivalent, and at this time:
then
Optionally, the invention uses a ruler or flatness measuring instrument with a length of 3m to measure the flatness of the underlay and the spread.
Optionally, the present invention uses a ruler or level to measure the mat virtual thickness and mat compaction thickness.
Compared with the prior art, the invention has the following beneficial technical effects:
the method for improving the construction flatness of the road surface provided by the invention can obtain the target virtual pavement coefficient of the spreading layer flatness and the lower bearing layer flatness in a balanced state by measuring the lower bearing layer flatness and the spreading layer flatness in the road engineering for mechanical construction by adopting the paver. And the actual measurement virtual paving coefficient can be obtained by measuring the virtual paving thickness and the compaction thickness of the paving layer. The more the actual measurement virtual paving coefficient of the paving layer is close to the target virtual paving coefficient, the better the flatness of the rolling forming surface is, therefore, when the actual measurement virtual paving coefficient of the paving layer is greatly different from the target virtual paving coefficient, the vibrating frequency of the paver is adjusted until the adjusted actual measurement virtual paving coefficient is close to the target virtual paving coefficient, so that the flatness of the rolling forming road surface is improved, and the performance of the road surface is further improved.
Drawings
Fig. 1 is a flowchart of a method for improving the flatness of pavement construction provided by the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention provides a method for improving the construction flatness of a pavement, which comprises the following steps:
step 1), measuring flatness delta H of a lower bearing layer01And spreading layer flatness Delta H02：
Step 1.1): measuring the surface flatness delta H of a lower bearing layer to be paved by adopting a flatness measuring instrument or a 3m ruler01And calculating the flatness Delta H of the molding surface determined by the flatness of the lower bearing layer according to the formula (1)1：
△H1＝(1-1/K)△H01 (1)；
In the formula, K is the virtual paving coefficient of the paving layer.
Step 1.2): measuring the surface evenness delta H of the paved layer which is paved and not rolled by adopting a flatness measuring instrument or a 3m ruler02And calculating the flatness delta H of the molding surface determined by the flatness of the spreading layer according to the formula (2)2；
△H2＝(1/K)△H02 (2)；
Step 2): determining a reasonable target virtual paving coefficient:
the formula (1) shows that the influence of the flatness of the lower bearing layer on the forming surface is positively correlated with the virtual paving coefficient of the spreading layer, and the smaller the virtual paving coefficient is, the smaller the influence of the flatness of the lower bearing layer on the forming surface is. The formula (2) shows that the influence of the spreading layer flatness on the molding surface is negatively correlated with the virtual spreading coefficient of the spreading layer, and the smaller the virtual spreading coefficient is, the larger the influence of the spreading layer flatness on the molding surface is.
The flatness of the road surface after final forming is determined by the formula (1) and the formula (2) together, the sum of expressions in brackets in the two formulas is 1, the two formulas are shown to be in a complementary relationship, the former is larger than the latter, the former is smaller than the latter, and the latter is larger, so that the conditions of simultaneous increase or simultaneous decrease cannot exist. Therefore, when the flatness of the lower bearing layer is poor and the paving flatness is good, the transmission of the flatness of the lower bearing layer can be inhibited by adopting the technical measure of reducing the virtual paving coefficient, so that the good flatness of the forming surface is obtained; when the spreading layer has poor flatness and the lower bearing layer has good flatness, the influence of the spreading layer flatness on the forming surface can be inhibited by adopting the technical measure of properly increasing the virtual paving coefficient, and the good forming surface flatness can be obtained.
If the two terms of the formula (1) and the formula (2) are equal, the influence of the flatness of the lower bearing layer and the flatness of the spreading layer on the flatness of the forming surface is equivalent (the two terms are called as equal)Balance control method), then formula (3) and table 1 can be obtained, and the data in table 1 determines Δ H02/△H01And a target virtual tiling coefficient K. If paving operation is performed, the requirements in table 1 are met, so that the forming surface can obtain the optimal flatness, and the formula (3) is called as a spreading layer flatness and lower bearing layer flatness balance control model for obtaining the optimal flatness of the forming surface.
The target virtual paving coefficient K of the paving layer is as follows:
TABLE 1. DELTA.H02/△H01And the virtual spread coefficient K
Step 3): measuring the virtual paving thickness of the paving layer, measuring the compacted thickness of the compacted and molded paving layer at the same point, and calculating the actual measurement virtual paving coefficient of the paving layer, wherein the actual measurement virtual paving coefficient of the paving layer is the ratio of the virtual paving thickness of the paving layer to the compacted thickness of the paving layer;
step 4), adjusting the vibration frequency of the paver to enable the actual virtual paving coefficient of the paving layer to be close to the target virtual paving coefficient so as to obtain more excellent forming surface flatness:
the paver mainly comprises a tractor and a working device, wherein the tractor provides a power source for the paver, provides traction force for the working device, conveys a mixture discharged into a hopper of a truck to a spiral material distribution chamber, and distributes the material along a screed plate. The working device shapes the mixture and tamps the mixture preliminarily to obtain a spreading layer of the mixture with certain geometric dimension, flatness and compactness. The vibrator is a core component in a working device of the paver, and the vibrating frequency of the vibrator can be adjusted in a stepless way; under a certain operation speed of the paver, the virtual paving coefficient of the spreading layer can be changed by adjusting the frequency of the vibrator.
In the process, a leveling instrument or a ruler is adopted to measure the virtual paving thickness and the compacted thickness of the paving layer, and the actual virtual paving coefficient of the paving layer is obtained through the ratio of the leveling instrument to the ruler. When the actual virtual paving coefficient of the paving layer is smaller than the target virtual paving coefficient, the actual virtual paving coefficient can be increased by reducing the vibration frequency; when the actual virtual paving coefficient of the spreading layer is larger than the target virtual paving coefficient, the actual virtual paving coefficient can be reduced by increasing the vibration frequency until the actual virtual paving coefficient of the spreading layer approaches the target virtual paving coefficient.
The invention is further illustrated by the following examples:
the first embodiment is as follows:
this embodiment is carried out in section K2+830 of LM1 standard of physical engineering highway. The method comprises the following steps:
1. a preparation stage:
1.1, instrument:
ruler for measuring thickness: the resolution is 0.1mm, and the measuring range is 0.5 m;
measuring the flatness ruler: the length of the device is 3 m;
plug gauge: the resolution was 0.1 mm.
1.2, equipment and parameters:
a Power DT1800 paver is adopted, and a vibrator is arranged on a working device of the paver. Parameters of the paver: the vibration frequency is 0 Hz-25 Hz; the spreading thickness is 0 mm-500 mm.
2. The working process is as follows:
2.1, measuring the flatness of a lower bearing layer and the flatness of a spreading layer:
before paving the mixture, measuring the flatness of a lower bearing layer by adopting a 3m ruler and a plug gauge, wherein the actual measurement result is 8.1 mm;
(2) after the mixture begins to be paved, the flatness of the paved layer is measured by adopting a 3m ruler and a plug gauge, and the actual measurement result is 2.3 mm.
2.2, calculating a target virtual paving coefficient of the paving layer:
and calculating a target virtual paving coefficient K of the paving layer according to the measured flatness of the lower bearing layer and the measured flatness of the paving layer, wherein the calculation result is that K is 1.28.
2.3, measuring the actually measured virtual paving coefficient of the paving layer:
firstly, measuring the virtual paving thickness of the spreading layer by using a ruler for measuring the thickness, wherein the actual measurement result is 49.5 cm; and then, measuring the compacted thickness of the compacted and molded spreading layer at the same point, wherein the actual measurement result is 36.7cm, and the actual measurement coefficient of the virtual spreading coefficient is 1.35 according to the ratio of the virtual spreading thickness of the spreading layer to the compacted thickness of the spreading layer.
2.4, adjusting the vibration frequency of the paver:
because the actually measured virtual paving coefficient is larger than the target virtual paving coefficient of the spreading layer, the spreading layer is not compact enough, and the frequency of the vibrator needs to be increased; the vibration frequency of the paver is adjusted from the original 11Hz to 12Hz so as to increase compaction work and reduce the virtual paving coefficient of the spreading layer.
2.5, measuring the actually measured virtual paving coefficient of the paving layer again:
measuring the virtual pavement thickness of the spreading layer again by using a ruler for measuring the thickness, wherein the actual measurement result is 46.8 cm; and then, measuring the compacted thickness of the compacted and molded spreading layer at the same point, wherein the actual measurement result is 36.7cm, the virtual paving coefficient is 1.27, and is very close to the target virtual paving coefficient, and the adjustment process is completed.
3. Flatness detection results:
the flatness of the molded surface was measured before and after the adjustment of the virtual paving coefficient of the actual paving layer, and the results are shown in table 2. The data in table 2 show that, in the road section where the actual measurement virtual paving coefficient of the paving layer is close to the target virtual paving coefficient, the molded surface flatness is significantly improved in the road section far from the target virtual paving coefficient.
Table 2: flatness of formed surface at different virtual paving coefficients
Example two:
this example was carried out on the physical engineering highway LM1 standard K2+ 850. The method comprises the following steps:
1. a preparation stage:
1.1, instrument:
(1) a level gauge for measuring thickness;
(2) flatness measuring instrument.
1.2, equipment and parameters:
a Power DT1800 paver is adopted, and a vibrator is arranged on a working device of the paver. Parameters of the paver: the vibration frequency is 0 Hz-25 Hz; the spreading thickness is 0 mm-500 mm.
2. The working process is as follows:
2.1, measuring the flatness of a lower bearing layer and the flatness of a spreading layer:
before paving the mixture, measuring the flatness of a lower bearing layer by using a flatness measuring instrument, wherein the actual quantity result is 7.9 mm;
(2) after the mixture starts to be paved, the flatness of the paved layer is measured by using a flatness measuring instrument, and the measured result is 2.6 mm;
2.2, calculating a target virtual paving coefficient of the paving layer:
and calculating a spreading target virtual paving coefficient K according to the measured flatness of the lower bearing layer and the measured flatness of the spreading layer, wherein the calculation result is that K is 1.33.
2.3, measuring the actually measured virtual paving coefficient of the paving layer:
adopting a level gauge, firstly measuring the virtual pavement thickness of the paving layer, wherein the actual measurement result is 47.0 cm; then, the compacted thickness of the compacted and molded spreading layer is measured at the same point, the actual measurement result is 36.4cm, and the ratio of the virtual spreading thickness of the spreading layer to the compacted thickness of the spreading layer is 1.29.
2.4, adjusting the vibration frequency of the paver:
the actually measured virtual paving coefficient is smaller than the target virtual paving coefficient of the spreading layer, so that the spreading layer is over-dense, and the frequency of the vibrator needs to be reduced; the vibration frequency of the paver is adjusted from 12Hz to 11Hz so as to reduce compaction work and improve the actual measurement virtual paving coefficient of the spreading layer.
2.5, measuring the actually measured virtual paving coefficient of the paving layer again:
measuring the virtual pavement thickness of the paving layer again by using a level gauge, wherein the actual measurement result is 48.3 cm; and then, measuring the compacted thickness of the compacted and molded spreading layer at the same point, wherein the actual measurement result is 36.4cm, the calculated virtual paving coefficient is 1.33, which is very close to the target virtual paving coefficient of the spreading layer, and the adjustment process is completed.
3. Flatness detection results:
the flatness of the molded surface was measured before and after the adjustment of the actual virtual paving coefficient of the paving layer, and the results are shown in table 3. The data in table 3 show that the closer the actual measured virtual paving coefficient of the paving layer is to the target virtual paving coefficient, the higher the flatness of the molded surface.
Table 3: flatness of formed surface at different virtual paving coefficients
Claims (6)
1. A method for improving the construction flatness of a pavement is characterized by comprising the following steps:
step 1): measuring flatness Delta H of lower bearing layer01And spreading layer flatness Delta H02；
Step 2): calculating a target virtual paving coefficient K of the spreading layer when the flatness of the lower bearing layer and the flatness of the spreading layer are in a balanced state:
step 3): measuring the virtual paving thickness of the paving layer, measuring the compacted thickness of the compacted and molded paving layer at the same point, and calculating the actual measurement virtual paving coefficient of the paving layer, wherein the actual measurement virtual paving coefficient of the paving layer is the ratio of the virtual paving thickness of the paving layer to the compacted thickness of the paving layer;
step 4): when the actually measured virtual paving coefficient is close to the target virtual paving coefficient, continuous paving operation is carried out;
when the actual measurement virtual paving coefficient is not close to the target virtual paving coefficient and is larger than the target virtual paving coefficient, increasing the vibration frequency of the paver, so as to reduce the actual measurement virtual paving coefficient of the paving layer, and performing the step 5);
when the actual measurement virtual paving coefficient is not close to the target virtual paving coefficient and is smaller than the target virtual paving coefficient, reducing the vibration frequency of the paver, so as to improve the actual measurement virtual paving coefficient of the paving layer, and performing the step 5);
step 5): measuring the virtual paving thickness of the paving layer again, measuring the compacted thickness of the compacted and molded paving layer at the same point, and calculating the adjusted actual measurement virtual paving coefficient;
when the adjusted actual measurement virtual paving coefficient is close to the target virtual paving coefficient, continuous paving operation is carried out; otherwise, repeating the step 4) to the step 5) until the adjusted actually measured virtual paving coefficient is close to the target virtual paving coefficient.
2. The method for improving the construction flatness of the road surface according to claim 1, wherein the step 1) specifically comprises:
step 1.1): measuring the flatness Delta H of the lower bearing layer waiting for paving01And calculating the flatness Delta H of the molding surface determined by the flatness of the lower bearing layer according to the formula (1)1：
△H1＝(1-1/K)△H01 (1)；
Step 1.2): measuring the flatness delta H of the paved layer which is paved and not rolled02And calculating the flatness delta H of the molding surface determined by the flatness of the spreading layer according to the formula (2)2；
△H2＝(1/K)△H02 (2)。
3. The method for improving the construction flatness of the road surface according to claim 2, wherein the step 2) specifically comprises:
when Δ H1＝ΔH2During this time, the influence of the flatness of the lower bearing layer and the flatness of the spreading layer on the flatness of the forming surface is equivalent, and at this time:
then
4. The method of claim 1, wherein the step of measuring the flatness of the underlayment and the paved layer is performed using a ruler or a flatness measuring instrument.
5. The method for improving the flatness of a pavement according to claim 4, wherein the length of the straight ruler is 3 m.
6. The method of improving the smoothness of a roadway surface according to claim 1, wherein a ruler or a level gauge is used to measure the mat virtual thickness and mat compaction thickness.
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