A variable pavement asphalt layer water permeability experimental device and experimental method

Abstract

The present invention provides a variable pavement asphalt layer water permeability experimental device and an experimental method, which include a mounting plate for placing an asphalt layer and provided with a plurality of penetration holes, a slope adjusting device for rotatably connecting the mounting plate and adjusting the slope of the mounting plate, a first water collecting bucket detachable from the slope adjusting device and used for collecting water flowing horizontally from the asphalt layer, a second water collecting bucket detachable from the slope adjusting device and used for collecting water flowing vertically from the asphalt layer, a third water collecting bucket detachable inside the slope adjusting device and used for collecting water seeping from the asphalt layer, and a water storage tank installed on the slope adjusting device and used for supplying water to the asphalt layer.

Description

Technical Field

[0001] The invention relates to the technical field of road material construction, and in particular to a variable road surface asphalt layer water permeability test device and test method. Background Art

[0002] In recent years, the development of high-grade highways in my country has made great progress, and the scale and standards of highway construction have been continuously improved. However, the damage problem of highways and urban roads is also quite serious, especially the early damage problem of pavement is particularly prominent. Many roads have a large number of cracks, potholes, rutting, subsidence and other diseases within 35 years after opening to traffic, causing adverse social impacts and serious economic losses. The premature damage of asphalt concrete pavement and cement concrete pavement in my country is usually caused by the passage of heavy-loaded vehicles when the load-bearing structure is in a water-saturated state. For example, most roadbed subsidence, scouring, collapse and slurry, asphalt pavement loosening, peeling and cracking, cement concrete pavement pumping, misalignment, fracture and other diseases are all related to the erosion of surface water and groundwater to varying degrees. The action of water aggravates the damage of roadbed and pavement structure, accelerates the deterioration of pavement performance, and shortens their service life. Setting up a road drainage system is the key to solving this problem. In addition to setting up intercepting ditches, the use of permeable surface materials for pavement drainage systems is also particularly important. The permeability of the asphalt layer is a parameter that determines the service life of the road surface. The current experimental device for the drainage capacity of the asphalt layer has a complex structure. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a variable pavement asphalt layer water permeability test device and test method, the purpose of which is to solve the problem of the complex structure of the current asphalt layer drainage capacity test device.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] Provided is a variable pavement asphalt layer water permeability experimental device, which includes a mounting plate for placing an asphalt layer and provided with a plurality of penetration holes, a slope adjusting device rotatably connected to the mounting plate and used to adjust the slope of the mounting plate, a first water collecting bucket detachable from the slope adjusting device and used to collect water flowing horizontally from the asphalt layer, a second water collecting bucket detachable from the slope adjusting device and used to collect water flowing vertically from the asphalt layer, a third water collecting bucket detachable from the inside of the slope adjusting device and used to collect water seeping from the asphalt layer, and a water storage tank mounted on the slope adjusting device and used to supply water to the asphalt layer.

[0006] The beneficial effects of the present invention are as follows: in this solution, the slope adjustment device, the mounting plate, the first water collecting bucket, the second water collecting bucket and the third water collecting bucket are provided, which simplifies the existing experimental device and facilitates the detection of the water permeability of the asphalt layer.

[0007] Furthermore, the slope adjustment device includes four lifting devices distributed in a rectangular shape and a connecting plate for connecting the four lifting devices. The mounting plate is rotatably connected to the inner sides of the lifting rods of the four lifting devices. The first water collecting bucket, the second water collecting bucket and the third water collecting bucket are detachably connected to the connecting plate. The first water collecting bucket and the second water collecting bucket are located between the lifting devices.

[0008] Furthermore, the lifting device is any one of a screw mechanism, a cylinder mechanism, a hydraulic cylinder mechanism, and an electric telescopic mechanism.

[0009] Furthermore, the water storage tank is fixed on the connecting plate through two connecting rods.

[0010] Further, the connecting rod is "L" shaped.

[0011] Furthermore, a gate for opening or closing water is provided on the water storage tank.

[0012] Furthermore, a first water flow plate is provided at the lower end of the water storage tank for water to flow onto the asphalt layer, and a second water flow plate is provided on the mounting plate for water to flow onto the first water collecting bucket and the second water collecting bucket.

[0013] Furthermore, the second water collecting bucket and the third water collecting bucket are equally divided into a plurality of water tanks.

[0014] An experimental method for a variable pavement asphalt layer water permeability experimental device comprises the following steps:

[0015] S1. Adjust the slope adjustment device so that the transverse slope of the asphalt layer on the mounting plate is α and the longitudinal slope is β;

[0016] S2, filling a preset amount of water in the water storage tank, opening the gate, and after all the water flows into the first water collecting bucket, the second water collecting bucket, and the third water collecting bucket, respectively measuring the water volume of the first water collecting bucket, the water volume of the second water collecting bucket, and the water volume of the third water collecting bucket;

[0017] S3. Calculate the evaluation coefficient based on the water volume of the first water collecting bucket, the second water collecting bucket, and the third water collecting bucket:

[0018] S31, calculate the average value Y of each water tank in the second water collection bucket m and variance Y s :

[0019]

[0020] Among them, Y i is the water volume of the i-th water tank in the second water collection bucket;

[0021] S32, calculate the average value Z of each water tank in the third water collection bucket m and variance Z s :

[0022]

[0023] Among them, Z n is the water volume of the nth water tank in the third water collection bucket;

[0024] S33. Calculate the evaluation coefficient λ according to the water volume of the first water collecting bucket and the variance of the second water collecting bucket and the third water collecting bucket:

[0025]

[0026] S34, determining the drainage performance of the asphalt layer according to the evaluation coefficient. In step S1, the range of α is 0.9°-1.5° for the variable pavement, and the range of β is 0.3°-5.2° for the variable pavement.

[0027] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the beneficial effects brought about by the technical features of the technical solution described above, the present invention provides other technical problems that can be solved, other technical features included in the technical solution, and the beneficial effects brought about by these technical features, which will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural schematic diagram of a variable pavement asphalt layer water permeability experimental device in the present invention.

[0030] Among them: 1. the first water collecting bucket; 2. the second water flow plate; 3. the mounting plate; 4. the asphalt layer; 5. the first water flow plate; 6. the gate plate; 7. the water storage tank; 8. the connecting rod; 9. the universal seat; 10. the lifting device; 11. the second water collecting bucket; 12. the third water collecting bucket. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0032] Please refer to Figure 1The present invention provides a variable pavement asphalt layer permeability experimental device, which includes a mounting plate 3 for placing an asphalt layer 4 and provided with a plurality of penetration holes, a slope adjusting device rotatably connected to the mounting plate 3 and used to adjust the slope of the mounting plate 3, a first water collecting bucket 1 detachable from the slope adjusting device and used to collect horizontal water flowing from the asphalt layer 4, a second water collecting bucket 11 detachable from the slope adjusting device and used to collect vertical water flowing from the asphalt layer 4, a third water collecting bucket 12 detachable inside the slope adjusting device and used to collect water seeping from the asphalt layer 4, and a water storage tank 7 installed on the slope adjusting device and used to supply water to the asphalt layer 4.

[0033] In this solution, the slope adjustment device, the mounting plate 3 , the first water collecting bucket 1 , the second water collecting bucket 11 and the third water collecting bucket 12 are provided, which simplifies the existing experimental device and facilitates the operation to measure the water permeability of the asphalt layer 4 .

[0034] In this solution, the slope adjustment device includes four lifting devices 10 distributed in a rectangular shape and a connecting plate for connecting the four lifting devices 10, wherein the bottoms of the four lifting devices 10 can be bolted to the connecting plate, and the connecting plates can be welded. The mounting plate 3 is rotatably connected to the inner side of the lifting rods of the four lifting devices 10, and the mounting plate 3 and the lifting rods of the lifting devices 10 can be rotatably set through the universal seat 9, so that when the lifting device 10 is lifted, the slope of the mounting plate 3 can be changed, wherein the mounting plate 3 is located inside the rectangle formed by the four lifting devices 10, that is, the plate surface of the mounting plate 3 is smaller than the surface formed by the four lifting devices 10. The first water collecting bucket 1, the second water collecting bucket 11 and the third water collecting bucket 12 are detachably connected to the connecting plate, and latches can be set on the first water collecting bucket 1, the second water collecting bucket 11 and the third water collecting bucket 12, and a mounting hole used in conjunction with the latch is opened on the connecting plate, thereby realizing detachable connection. The first water collecting bucket 1 and the second water collecting bucket 11 are located between the lifting devices 10, so as to prevent water from flowing onto the lifting devices 10 and reduce experimental errors. The water tank 7 is fixed to the connecting plate by two connecting rods 8. The two ends of the connecting rods 8 can be connected to the water tank 7 and the connecting plate respectively by welding or bolts. The water tank 7 is provided with a gate plate 6 for opening or closing water. The lower end of the water tank 7 is provided with a first water flow plate 5 for water to flow to the asphalt layer 4. The first water flow plate 5 can be welded to the lower edge of the water tank 7. The mounting plate 3 is provided with a second water flow plate 2 for water to flow to the first water collecting bucket 1 and the second water collecting bucket 11. Figure 1, two second water flow plates 2 are respectively welded on the left side and the front side of the mounting plate 3. The second water collecting bucket 11 and the third water collecting bucket 12 are equally divided into multiple water tanks, wherein the second water collecting bucket 11 can be divided into a single row of water tanks, preferably 6-8 water tanks; the third water collecting bucket 12 can be decomposed into multiple rows, preferably 4 water tanks; in order to reduce the measurement error of the second water collecting bucket 11, a transparent scale line can be set on each water tank of the second water collecting bucket 11 to facilitate the measurement of the liquid level of the second water collecting bucket 11, and the liquid level measurement of the first water collecting bucket 1 and the third water collecting bucket 12 can be measured by a small level meter or an ultrasonic level meter.

[0035] Specifically, the connecting rod 8 is "L"-shaped.

[0036] Specifically, the lifting device 10 is any one of a screw mechanism, a cylinder mechanism, a hydraulic cylinder mechanism, and an electric telescopic mechanism. In order to facilitate the control of any one of the screw mechanism, the cylinder mechanism, the hydraulic cylinder mechanism, and the electric telescopic mechanism, four controllers can be used to control the lifting thereof, thereby changing the slope of the mounting plate 3. Specifically, the first water collecting bucket 1 is installed in the front, and the second water collecting bucket 11 is installed on the right side. The four lifting devices 10 are adjusted so that the water on the asphalt layer 4 can flow into the first water collecting bucket 1 and the second water collecting bucket 11.

[0037] An experimental method for a variable pavement asphalt layer water permeability experimental device comprises the following steps:

[0038] S1, adjusting the slope adjustment device so that the transverse slope of the asphalt layer 4 on the mounting plate 3 is α and the longitudinal slope is β;

[0039] S2, fill the water tank 7 with a preset amount of water, open the gate 6, and after all the water flows into the first water collecting bucket 1, the second water collecting bucket 11 and the third water collecting bucket 12, measure the water volume of the first water collecting bucket 1, the water volume of the second water collecting bucket 11 and the water volume of the third water collecting bucket 12 respectively;

[0040] S3. Calculate the evaluation coefficient according to the water volume of the first water collecting bucket 1, the second water collecting bucket 1 and the third water collecting bucket 12:

[0041] S31, calculate the average value Y of each water tank in the second water collection bucket 11 m and variance Y s :

[0042]

[0043] Among them, Y i is the water volume of the i-th water tank in the second water collection bucket;

[0044] S32, calculate the average value Z of each water tank in the third water collection bucket m and variance Z s :

[0045]

[0046] Among them, Z n is the water volume of the nth water tank in the third water collection bucket;

[0047] S33. Calculate the evaluation coefficient λ according to the water volume of the first water collecting bucket 1 and the variance of the second water collecting bucket and the third water collecting bucket:

[0048]

[0049] S34. Determine the drainage performance of the asphalt layer 4 according to the evaluation coefficient. The smaller the calculated value of λ is, the better the drainage capacity of the asphalt layer 4 is, and the worse the permeability is. Such an asphalt layer 4 is better for protecting the road surface.

[0050] In step S1, the α range is 0.9°-1.5° for a variable road surface, and the β range is 0.3°-5.2° for a variable road surface.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable pavement asphalt layer water permeability test device, It is characterized in that The invention comprises a mounting plate (3) for placing an asphalt layer (4) and provided with a plurality of penetration holes, a slope adjustment device rotatably connected to the mounting plate (3) and used to adjust the slope of the mounting plate (3), a first water collecting bucket (1) detachably connected to the slope adjustment device and used to collect water flowing horizontally from the asphalt layer (4), a second water collecting bucket (11) detachably connected to the slope adjustment device and used to collect water flowing vertically from the asphalt layer (4), a third water collecting bucket (12) detachably located inside the slope adjustment device and used to collect water seeping from the asphalt layer (4), and a water storage tank (7) mounted on the slope adjustment device and used to supply water to the asphalt layer (4); the second water collecting bucket (11) and the third water collecting bucket (12) are equally divided into a plurality of water tanks; The experimental method based on the above variable pavement asphalt layer water permeability experimental device includes the following steps: S1. Adjust the slope adjustment device so that the transverse slope of the asphalt layer (4) on the mounting plate (3) is α and the longitudinal slope is β ; S2, filling a water storage tank (7) with a preset amount of water, opening the gate (6), and after all the water flows into the first water collecting bucket (1), the second water collecting bucket (11) and the third water collecting bucket (12), measuring the amount of water in the first water collecting bucket (1), the amount of water in the second water collecting bucket (11) and the amount of water in the third water collecting bucket (12); S3. Calculate the evaluation coefficient based on the water volume in the first water collecting bucket (1), the second water collecting bucket (11) and the third water collecting bucket (12): S31, calculate the average value of each water tank in the second water collection bucket (11) and variance : ， in, For the second water collection bucket i The amount of water in each tank; S32, calculate the average value of each water tank in the third water collection bucket and variance : ， in, For the third water bucket n The amount of water in each tank; S33, calculating the evaluation coefficient λ according to the water volume of the first water collecting bucket (1) and the variance of the second water collecting bucket and the third water collecting bucket: ； S34. Determine the drainage performance of the asphalt layer (4) based on the evaluation coefficient.

2. A variable pavement asphalt layer water permeability test device according to claim 1, It is characterized in that The slope adjustment device comprises four lifting devices (10) distributed in a rectangular shape and a connecting plate for connecting the four lifting devices (10); the mounting plate (3) is rotatably connected to the inner sides of lifting rods of the four lifting devices (10); the first water collecting bucket (1), the second water collecting bucket (11) and the third water collecting bucket (12) are detachably connected to the connecting plate; the first water collecting bucket (1) and the second water collecting bucket (11) are located between the lifting devices (10).

3. A variable pavement asphalt layer water permeability test device according to claim 2, It is characterized in that The lifting device (10) is any one of a screw mechanism, a cylinder mechanism, a hydraulic cylinder mechanism, and an electric telescopic mechanism.

4. A variable pavement asphalt layer water permeability test device according to claim 2, It is characterized in that The water storage tank (7) is fixed to the connecting plate via two connecting rods (8).

5. A variable pavement asphalt layer water permeability test device according to claim 4, It is characterized in that The connecting rod (8) is L-shaped.

6. A variable pavement asphalt layer water permeability test device according to claim 4, It is characterized in that The water storage tank (7) is provided with a gate plate (6) for opening or closing water.

7. A variable pavement asphalt layer water permeability test device according to claim 6, It is characterized in that A first water flow plate (5) is provided at the lower end of the water storage tank (7) for water to flow onto the asphalt layer (4), and a second water flow plate (2) is provided on the mounting plate (3) for water to flow onto the first water collecting bucket (1) and the second water collecting bucket (11).

8. A variable pavement asphalt layer water permeability test device according to claim 1, It is characterized in that In step S1, the α range is 0.9°-1.5° for a variable road surface, and the β range is 0.3°-5.2° for a variable road surface.

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