CN105203442A - In-situ testing instrument and testing method for permeability coefficient of permeable pavement system - Google Patents

Abstract

The in-situ tester and test method for permeable pavement system permeability coefficient belong to the technical field of civil engineering. The in-situ tester includes a pavement system, foundation pipe fittings, measuring pipe fittings and a water supply system; the foundation pipe fittings are vertically installed on the pavement system Inside, the bottom end of the measuring pipe fitting is connected with the top end of the basic pipe fitting; the water supply system includes a water outlet pipe for supplying water to the measuring pipe fitting, and the outlet pipe is provided with a valve and a flow meter. The test method includes: supplying water to the measuring pipe fitting, making the water surface reach the overflow port and maintaining a state of no water overflow, and obtaining the seepage flow rate through the flow meter; dividing the seepage flow rate by the cross-sectional area of the basic pipe fitting is the seepage coefficient . The invention realizes the in-situ measurement on the road, can monitor the variation of the permeability coefficient at the same point on the permeable pavement for many years, and provides a basis for the optimal design of the permeable pavement and the selection of maintenance methods and timing.

Description

In-situ tester and test method for permeability coefficient of permeable pavement system

technical field

The invention relates to the technical field of civil engineering, in particular to an in-situ tester and a testing method for the permeability coefficient of a permeable pavement system, which are used for long-term in-situ monitoring of changes in the permeability coefficient of a permeable pavement.

Background technique

Permeable pavement is also called porous pavement, including permeable concrete pavement and permeable asphalt pavement. There are a large number of penetrating pores inside the coarse aggregate skeleton, which makes the pavement have good water permeability and can quickly allow a large amount of rainwater to seep into the ground, thereby effectively reducing the Minimize or eliminate urban rainstorm and flood disasters.

However, due to the large amount of suspended particles (such as silt, debris, etc.) contained in the surface runoff generated by rainfall, these mineral or organic fine particles will continue to enter the pores of the permeable pavement with the water flow, causing the pores to be blocked, thereby reducing the permeability of pervious concrete. , making it difficult for the permeable pavement to perform its drainage function, and eventually evolve into a non-permeable pavement, which shortens the service life and increases the possibility of urban flooding and freeze-thaw disasters.

At present, when measuring the permeability coefficient of cement, concrete and other building materials, the permeability coefficient is obtained by measuring the core sample or the fabricated test piece. However, only the original permeability coefficient of the building material can be obtained in this way. With the use of the pavement, in The permeability coefficient at the same point on the pavement cannot be obtained due to particle blockage, rainfall, cleaning, etc., resulting in the inability to determine the best maintenance method and timing for the permeable pavement. There is also a lack of reliable basis for the optimal design of the permeable pavement .

Contents of the invention

In view of the above problems, the object of the present invention is to provide a permeable pavement system permeability coefficient in-situ tester and testing method, the tester and testing method can carry out long-term in-situ measurement of the pavement, and provide an optimal design and maintenance method for the permeable pavement and timing selection.

The technical solution adopted by the present invention to solve the technical problem is: the permeable pavement system permeability coefficient in-situ tester, including the pavement system, which includes the permeable pavement, the permeable roadbed and the compacted original soil in sequence from top to bottom, and also includes Basic pipe fittings, measuring pipe fittings and water supply system; the basic pipe fittings are vertically installed in the road system, and the bottom end of the measuring pipe fittings is connected with the top of the basic pipe fittings; the water supply system includes a water outlet pipe, which is used for measuring Water is supplied in the pipe fitting, and a valve and a flow meter are arranged on the outlet pipe.

If it is to measure the permeability coefficient of the series system of the permeable pavement and the permeable roadbed, the end surface of the bottom end of the foundation pipe is located above the compacted original soil and there is a gap between the upper surface of the compacted original soil. Said gap is reserved for the purpose of draining the infiltrated water during measurement, and the width of the gap is generally 1 to 5 cm.

If it is for simply measuring the permeability coefficient of the permeable pavement, the end surface at the bottom of the foundation pipe is flush with the lower surface of the permeable pavement.

A further technical solution is: the top surface of the basic pipe is flush with the upper surface of the pavement system, and the connection between the measuring pipe and the basic pipe is detachable. When not measuring, the measuring pipe fittings can be removed. At this time, the top surface of the basic pipe fittings is flush with the upper surface of the pavement system, which does not affect the normal use of the pavement system.

A further technical solution is: the upper part of the side wall of the measuring pipe is provided with an overflow port. The overflow port is set, which makes the operation more convenient during the test and improves the accuracy of the result.

A further technical solution is: the bottom end of the measuring pipe fitting is sleeved outside the top end of the base pipe fitting, and the inner surface of the side wall of the measuring pipe fitting closely matches the outer surface of the side wall of the base pipe fitting. The two sleeves can effectively prevent water from flowing out from the gap between the basic pipe fitting and the measuring pipe fitting during the test, and the connection method can be plug-in or threaded. Set the measuring pipe fittings on the outside of the basic pipe fittings to ensure that the cross-sectional areas of the points to be measured are consistent and ensure the accuracy of the results.

A further technical solution is: the outer side of the basic pipe is provided with a joint pipe coaxial with the basic pipe, and an annular groove for accommodating the measuring pipe is arranged between the joint pipe and the basic pipe; when measuring, the measuring pipe is inserted into the In the annular groove, when the measurement is not performed, the plugging pipe is inserted into the annular groove to seal it. The joint pipe fittings are provided to facilitate the rapid installation of the measuring pipe fittings when in use. When the measuring pipe fittings are not in use, remove them and use the plugging pipe fittings to seal the annular groove. First, keep the road surface smooth without affecting the use of the road surface; It is to prevent debris from entering the annular groove.

A further technical solution is: the water supply system further includes a water storage tank and a water pump, the water pump is located inside the water storage tank; one end of the water outlet pipe is connected to the water pump, and the other end is located above the measuring pipe. The water is supplied by the water storage tank and the water pump, which is convenient for installation and disassembly anytime and anywhere, and the cost is low, and the movement, assembly and disassembly are very convenient.

The basic pipe fittings of the present invention can be UPVC pipes, PVC pipes or steel pipes, and the inner diameter is generally selected between 100-300 mm.

The technical solution adopted by the present invention to solve the technical problem also includes: the testing method of the permeable pavement system permeability coefficient in-situ tester, supplying water to the measuring pipe fitting through the outlet pipe, adjusting the water supply through the valve, so that the water surface reaches the overflow port and keeps In the state of no water overflow, the reading of the flow meter at this time is the seepage flow; the seepage flow is divided by the cross-sectional area of the foundation pipe to obtain the seepage coefficient of the pavement system.

A further technical solution is: the seepage flow rate is taken as the average value of the readings of the flowmeter within a period of time. Taking the average value of the readings of the flowmeter within a period of time can improve the reliability of the test results, and generally take the average value of 5 to 10 minutes.

The beneficial effects of the present invention are:

1. The basic pipe fittings of the tester of the present invention are directly installed in the pavement system. Instead of obtaining the permeability coefficient by measuring the core sample or the prepared sample, the permeability coefficient at the same point on the permeable pavement can be monitored over the years. Changes due to impacts such as particle clogging, rainfall and sweeping;

2. The structure and maintenance of the tester of the present invention are very simple. The measuring pipe can be quickly installed when in use, and can be removed when not in use. The top surface of the basic pipe is flush with the upper surface of the road system and does not affect the road system. normal use;

3. Since the basic pipe fittings of the present invention are located inside the pavement system, the measuring pipe fittings can be dismantled after the measurement is completed, and will not be attacked by wind, sun, etc., and have a long service life;

4. The test method of the present invention is easy to operate, and the result is accurate and reliable, which provides a basis for the optimal design of the permeable pavement and the selection of maintenance methods and timing.

Description of drawings

Fig. 1 is a structural schematic diagram of the pavement system, the basic pipe fittings, the measuring pipe fittings and the joint pipe fittings in Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the pavement system, the basic pipe fittings, the measuring pipe fittings and the joint pipe fittings in the second embodiment of the present invention;

Fig. 3 is a structural schematic diagram after installing a plugging pipe fitting in an embodiment of the present invention;

Fig. 4 is the top view of Fig. 3;

FIG. 5 is a schematic diagram of the overall structure of an embodiment of the present invention.

In the figure: 1 permeable road surface, 2 permeable roadbed, 3 compacted original soil, 4 foundation pipe fittings, 5 measuring pipe fittings, 6 joint pipe fittings, 7 overflow outlet, 8 plugging pipe fittings, 9 water pump, 10 water storage tank, 11 valve, 12 Flow meter, 13 outlet pipes.

detailed description

The present invention will be further described below in conjunction with accompanying drawing of description and specific embodiment:

Embodiment one:

As shown in Figure 1 and Figure 5. Permeable pavement system permeability coefficient in-situ tester, including pavement system, said pavement system includes permeable pavement 1, permeable roadbed 2 and compacted original soil 3 from top to bottom, and also includes foundation pipe fitting 4, measuring pipe fitting 5 and water supply system The basic pipe fitting 4 is vertically installed in the road system, and the bottom end of the measuring pipe fitting 5 is connected with the top end of the basic pipe fitting 4; For water supply, the outlet pipe 13 is provided with a valve 11 and a flow meter 12 .

As shown in FIG. 1 , the end surface of the bottom end of the foundation pipe 4 is located above the compacted raw soil 3 and has a gap with the upper surface of the compacted raw soil 3 . The slit is left to allow the infiltrated water to drain away during the measurement, and the width h of the slit is 2 cm.

The top surface of the basic pipe 4 is flush with the upper surface of the pavement system, and the connection between the measuring pipe 5 and the basic pipe 4 is detachable. When not measuring, the measuring pipe 5 can be removed, and the top surface of the basic pipe 4 is flush with the upper surface of the pavement system at this time, which does not affect the normal use of the pavement system.

The upper part of the side wall of the measuring tube 5 is provided with an overflow port 7 . The overflow port 7 is provided, which makes the operation more convenient during testing and improves the accuracy of the results.

The bottom end of the measuring pipe 5 is sleeved outside the top of the base pipe 4 , and the inner surface of the side wall of the measuring pipe 5 closely matches the outer surface of the side wall of the base pipe 4 . The nesting of the two can effectively prevent water from flowing out from the gap between the basic pipe fitting 4 and the measuring pipe fitting 5 during the test, and the connection method can be plug-in or threaded. Set the measuring pipe fitting 5 on the outside of the basic pipe fitting 4 to ensure that the cross-sectional area of the point to be measured is consistent and ensure the accuracy of the results.

The outer side of the basic pipe 4 is provided with a joint pipe 6 coaxial with the basic pipe 4, and an annular groove for accommodating the measuring pipe 5 is arranged between the joint pipe 6 and the basic pipe 4; when measuring, the measuring pipe 5 is inserted In the annular groove, as shown in Fig. 3 and Fig. 4, when no measurement is performed, the plugging pipe 8 is inserted into the annular groove to seal it. The joint pipe fitting 6 is provided to facilitate the rapid installation of the measuring pipe fitting 5 during use. When the measuring pipe fitting 5 is not in use, it is removed and the sealing pipe fitting 8 is used to seal the annular groove. One is to keep the road surface smooth without affecting the road surface The second is to prevent debris from entering the annular groove.

As shown in Fig. 5 , the water supply system also includes a water storage tank 10 and a water pump 9, the water pump 9 is located inside the water storage tank 10; Water is supplied through the water storage tank 10 and the water pump 9, which is convenient for installation and disassembly anytime and anywhere, with low cost and very convenient movement and assembly and disassembly.

The basic pipe fitting 4 of the present invention can adopt UPVC pipe, PVC pipe or steel pipe, and its inner diameter d is 200mm.

The test method of the in-situ tester for the permeability coefficient of the permeable pavement system includes the following steps:

Step 1): Install the basic pipe fittings: when the basic pipe fittings 4 use UPVC pipes or PVC pipes, embed the basic pipe fittings 4 into the pavement system synchronously with the construction. What materials (such as stones or concrete) are used in the construction of the pavement system are determined in the foundation pipe fittings. 4 Put the same material inside, and also go through the corresponding compaction process. When the basic pipe fittings 4 are steel pipes, the basic pipe fittings 4 are driven into the pavement system after the construction of the pavement system is completed.

The advantage of using steel pipes to drive into the pavement system is that they can be installed after the construction is completed without affecting the pavement construction.

Step 2): installing the measuring pipe fitting: installing the measuring pipe fitting 5 above the base pipe fitting 4 . The inner diameter of the measuring pipe fitting 5 is equal to the outer diameter of the basic pipe fitting 4, and the measuring pipe fitting 5 is not usually installed on the road surface, but is only installed when measurement is required.

Step 3): Obtain the seepage flow rate: supply water to the measuring pipe fitting 5 through the water outlet pipe 13, adjust the water supply through the valve 11, make the water surface reach the overflow port 7 and keep the state without water overflow, and the reading of the flow meter 12 at this time is Seepage flow. In order to ensure the accuracy of the results, the seepage flow rate is the average value within 12 ten minutes of the flow meter.

Step 4): obtaining the seepage coefficient: dividing the seepage flow rate by the cross-sectional area of the foundation pipe 4 to obtain the seepage coefficient of the pavement system. In this embodiment, the cross-sectional area of the basic pipe 4 is π×(d/2) ² .

Step 5): After the measurement is completed, the measuring pipe fitting 5 is removed, and the plugging pipe fitting 8 is inserted into the annular groove for the next measurement.

This embodiment is used to measure the permeability coefficient of the series system of the permeable pavement 1 and the permeable roadbed 2 .

Embodiment two:

As shown in FIG. 2 , the features of this embodiment that are the same as those of Embodiment 1 will not be repeated here. The difference between this embodiment and Embodiment 1 is that the end surface of the bottom end of the basic pipe 4 is flush with the lower surface of the permeable road surface 1 .

This embodiment is used to simply measure the permeability coefficient of the permeable pavement 1 .

In the above-mentioned embodiments, the tester is equipped with an overflow port 7. If the overflow port 7 is not provided, the amount of water supply needs to be adjusted through the valve 11 during the test, so that the water surface just reaches the upper end surface of the measuring pipe fitting 5, but And maintain the state of no water overflow, to obtain seepage flow. In this way, since there may be multiple water outlet points on the upper edge of the measuring tube 5 , it is not convenient for the operator to observe and may increase the error.

In the above-mentioned embodiment, the basic pipe fitting 4, the measuring pipe fitting 5, the joint pipe fitting 6 and the plugging pipe fitting 8 all adopt round pipes, but the shape of the above-mentioned pipe fittings in the present invention is not limited to round pipes. The principle of the structure and test method is the same as that of the above-mentioned embodiments, and the cross-section of the round tube has no edges and corners, which is convenient for matching and mass production, so the round tube is a preferred embodiment.

The above is only a preferred embodiment of the present invention, not all embodiments of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention , should be included within the protection scope of the present invention.

Except for the technical features described in the description, the rest of the technical features are known to those skilled in the art. In order to highlight the innovative features of the present invention, the above technical features will not be repeated here.

Claims (10)

1. porous pavement system infiltration coefficient in-situ test instrument, comprises Road System, and described Road System comprises porous pavement, permeable roadbed and compacting original soil from top to bottom successively, it is characterized in that, also comprises basic pipe fitting, measures pipe fitting and water system; What described basic pipe fitting was vertical is installed in Road System, and the measurement bottom of pipe fitting and the top of basic pipe fitting are connected; Described water system comprises rising pipe, and rising pipe is used for supplying water in measurement pipe fitting, and rising pipe is provided with valve and flowmeter.

2. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, is characterized in that, the end face of described basic pipe fitting bottom is above compacting original soil and and have gap between the upper surface of compacting original soil.

3. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, is characterized in that, the end face of described basic pipe fitting bottom is concordant with the lower surface of porous pavement.

4. the porous pavement system infiltration coefficient in-situ test instrument according to Claims 2 or 3, it is characterized in that, the top end face of described basic pipe fitting is concordant with the upper surface of described Road System, and the connection between described measurement pipe fitting and basic pipe fitting is for removably connecting.

5. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, is characterized in that, the top of described measurement pipe fitting sidewall is provided with overflow vent.

6. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, is characterized in that, the bottom of described measurement pipe fitting is nested with in the outside of basic tubular top, and the inside surface measuring pipe fitting sidewall coordinates with the intimate of basic pipe fitting sidewall.

7. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, it is characterized in that, the arranged outside of described basic pipe fitting has the coupling pipe elements with basic pipe fitting coaxial cable, is provided with the annular groove holding and measure pipe fitting between coupling pipe elements and basic pipe fitting; When measuring, measure pipe fitting and be plugged in described annular groove, when not measuring, shutoff pipe fitting is inserted annular groove and is sealed.

8. porous pavement system infiltration coefficient in-situ test instrument according to claim 1, it is characterized in that, described water system also comprises aqua storage tank and water pump, and water pump is positioned at the inside of aqua storage tank; Described rising pipe one end is connected with water pump, and the other end is positioned at the top of described measurement pipe fitting.

9. utilize the porous pavement system infiltration coefficient in-situ test instrument described in claim 5 to carry out the method for testing of testing, it is characterized in that, supply water in measurement pipe fitting, adjustment output, make the water surface reach overflow vent and keep not having the state of water overflow, now the reading of flowmeter is seepage flow flow; Described seepage flow flow, divided by the discharge section area of basic pipe fitting, obtains the seepage coefficient of Road System.

10. method of testing according to claim 9, is characterized in that, described seepage flow flow gets the mean value of reading in flowmeter a period of time.