DEVICE FOR SIMULATING CLOGGING AND MONITORING RAINWATER PURIFICATION OF PERMEABLE CONCRETE PAVEMENT

Abstract

Disclosed is a device for simulating clogging and monitoring rainwater purification of permeable concrete pavement. The device includes a fixed upright post, a telescopic upright post, a clogging simulation device, a 5 rainwater runoff monitoring device and a drainage device, where the fixed upright post and the telescopic upright post are arranged side by side. The telescopic upright post includes a hydraulic cylinder and a piston rod, a bottom end of the piston rod is arranged in the hydraulic 10 cylinder, and the hydraulic cylinder is capable of driving the piston rod to move up and down. The clogging simulation device includes a simulation barrel and an air conditioner, the air conditioner is arranged on the fixed upright post, the simulation barrel is fixedly arranged 15 between the fixed upright post and the telescopic upright post, and an inner cavity of the simulation barrel is provided with a permeable concrete test block.

Description

l DEVICE FOR SIMULATING CLOGGING AND MONITORING RAINWATER PURIFICATION OF PERMEABLE CONCRETE PAVEMENT TECHNICAL FIELD [OI] The present invention relates to the technical field of concrete tests, and in particular to a device for simulating permeable concrete pavement clogging and monitoring rainwater purification. BACKGROUND ART

[02] At present, with the continuous development of urbanization, urban roads are crisscrossed, but because the development speed of urban road surface permeability is far less than the construction speed of urban roads, a series of problems are caused, such as urban waterlogging in the rainy season, groundwater recharge reduction, and natural rainfall with class II water quality being polluted to class V or even worse than class V rainfall runoff. In this case, permeable concrete pavement is a pavement form. that can effectively solve such. problems. When precipitation far exceeds the drainage capacity of ordinary pavement, the permeable concrete pavement can still quickly reduce rainwater runoff, and also has good ecological functions, which can effectively alleviate an urban heat island effect.

[03] However, the permeable concrete pavement is often blocked by dust, gravel and household waste due to large pores of permeable concrete, which makes it difficult to give full play to the permeable characteristics of the permeable concrete. For existing permeable concrete clogging simulation devices, the structures disclosed in CN201310390322.7 and. CN201520670845.1 are as follows: a permeability coefficient of permeable concrete is obtained by means of a flowmeter, but the flowmeter is expensive, and fine sediment is likely to damage the flowmeter. Moreover, dynamic factors generated. by coupling' between vehicles and the pavement and environmental factors of the pavement fail to be simulated in the prior art, an entire process of clogging of permeable concrete and the relationship between the clogging and purification of rainwater runoff fail to be nmnitored, and influence of various clogging factors on a purification effect of the permeable concrete cannot be obtained. SUMMARY

[04] An objective of the present invention is to provide a device for simulating permeable concrete pavement clogging and monitoring rainwater purification, so as to solve the problems existing' in the prior art and. more accurately simulate permeable concrete clogging and monitor water purification conditions.

[05] To achieve the abovementioned objective, the present invention provides the solutions as follows:

[06] The present invention provides a device for simulating permeable concrete pavement clogging and monitoring rainwater purification. The device includes a fixed upright post, a telescopic upright post, a clogging simulation device, a rainwater runoff monitoring device and a drainage device, where the fixed upright post and the telescopic upright post are arranged side by side. The telescopic upright post includes a hydraulic cylinder and a piston rod, a bottom end of the piston rod is arranged in the hydraulic cylinder, and the hydraulic cylinder is capable of driving the piston rod to move up and down. The clogging simulation device includes a simulation. barrel and an air conditioner, the air conditioner is arranged on the fixed upright post, and the air conditioner is capable of adjusting an ambient temperature of the simulation barrel. The simulation barrel is fixedly arranged between the fixed upright post and the telescopic upright post, a lower portion of the simulation barrel is provided with a drainage port, and an inner cavity of the simulation barrel is provided with a permeable concrete test block. A horizontal flow velocity simulation device is arranged above the permeable concrete test block, and the horizontal flow velocity simulation device includes a stainless steel sprinkler and a rotating mechanical device. The stainless steel sprayer is connected to the rotating mechanical device by means of a slender pipe, and the other end. of the slender pipe is connected. to a water suction pump by means of a pipeline. The rotating mechanical device is arranged on the piston rod, and the rotating mechanical device is capable of :moving' up and down along with the piston rod. A temperature detector is arranged on an inner wall of the simulation barrel, and the temperature detector is arranged above the permeable concrete test block. An upper end of the permeable concrete test block is provided. with. a vehiclepavement coupling simulation device, and a lower end of the permeable concrete test block is provided with the rainwater runoff monitoring device. The drainage port is connected to a drainage device, a main body of the drainage device is composed of a flexible pipe, and a stop valve is arranged on the flexible pipe. A receiving tank is arranged. at a water outlet of the flexible pipe, a filter screen is arranged at an upper port of the water receiving' tank, and ea weighing' sensor* is arranged. at a lower end of the water receiving tank.

[07] Compared with the prior art, the present invention achieves the following technical effects:

[08] The present invention designs a brandnew multifunctional test device for simulating permeable concrete pavement clogging and monitoring rainwater runoff purificationthe , utilizes the vehiclepavement coupling simulation device to simulate dynamic influence generated by coupling of vehicles and pavement, simulates an adverse environment of permeable concrete by adjusting the release amount of pollutants, and. utilizes the rainwater* runoff monitoring device to monitor water purification conditions in the whole process. The present invention not only can simulate clogging factors of the permeable concrete pavement under an action of vehicles more comprehensively and accurately, but also can monitor the filtering effect of the permeable concrete pavement on rainwater runoff. Moreover, a scientific experimental apparatus for studying permeable concrete pavement clogging and rainwater runoff purification of the pavement is provided, which can simulate the permeable concrete pavement clogging more simply and conveniently, and monitor a purification effect of the test block on the rainwater runoff in the whole process. A permeability coefficient of permeable concrete in the whole process of clogging can be obtained by means of an intelligent water pressure sensor and. a weighing sensor. The experimental device is not only simple in structure and low in cost, but also can simulate the coupling action of many factors and has high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[09] FIG. 1 is a schematic diagram of a device for simulating permeable concrete pavement clogging and monitoring rainwater purification provided by the present invention; and

[10] FIG. 2 is a schematic diagram of a using method of a device for simulating permeable concrete pavement clogging and monitoring rainwater purification provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[11] The technical solutions in the examples of the present invention will be clearly and completely described below with reference to the accompanying drawings in the examples of the present invention. Obviously, the described examples are merely some examples rather than all examples of the present invention. All the other examples obtained by those of ordinary skill in the art based. on the examples in the present invention. without creative efforts shall fall within the scope of protection of the present invention.

[12] An objective of the present invention is to provide a device for simulating clogging and. monitoring rainwater purification of permeable concrete pavement, so as to solve the problems existing in the prior art and. more accurately simulate permeable concrete clogging and monitor water purification conditions.

[13] .As shown. in FIGs. 1 and. 2, the present invention provides a device for simulating clogging and monitoring rainwater purification of permeable concrete pavement. The device includes a fixed upright post 23, a telescopic upright post, a clogging simulation. device, a rainwater runoff monitoring device and a drainage device, and the fixed upright post 23 and the telescopic upright post are arranged side by side. The telescopic upright post includes a hydraulic cylinder 24 and a piston rod 25, a bottom end of the piston rod 25 is arranged in the hydraulic cylinder 24, and the hydraulic cylinder 24 is capable of driving the piston rod 25 to move up and down. The clogging simulation device includes a simulation barrel 1 and an air conditioner 21, the simulation barrel 1 is preferably made of an acrylic material, the air conditioner 21 is arranged on the fixed upright post 23, and. the air conditioner 21 is capable of adjusting an ambient temperature of the simulation barrel 1 so as to facilitate simulation of the ambient temperature in rainy weather. The simulation barrel 1 is fixedly arranged between the fixed upright post 23 and the telescopic upright post, several overflow ports 10 are vertically provided at intervals in an upper portion of an outer wall of the simulation barrel 1, a lower portion of the outer wall of the simulation barrel 1 is provided with drainage ports, and the drainage ports of different heights are to simulate water head heights of rainwater on the pavement during rainfall. An inner cavity of the simulation barrel 1 is provide with a permeable concrete test block 6, and a horizontal flow velocity simulation device is arranged above the permeable concrete test block 6 in order to simulate a flow velocity of the rainwater on the pavement. A temperature detector 22 is arranged on an inner wall of the simulation barrel 1, and the temperature detector 22 is arranged above the permeable concrete test block 6 in order to monitor the ambient temperature of the simulation barrel 1. .An upper end. of the permeable concrete test block 6 is provided with a vehiclepavement coupling simulation device, so as to accurately simulate a coupling dynamic action of vehicles and the pavement. A lower end of the permeable concrete test block 6 is provided with the rainwater runoff monitoring device, so as to monitor purification conditions of permeable concrete to sewage in the whole process. The rainwater runoff monitoring device includes an intelligent water quality chemical oxygen demand. (COD) sensor 12, an intelligent ammonia. nitrogen sensor 13, an intelligent water turbidity / suspended solid (SS) sensor 14. The drainage port is connected. to the drainage device, and a main body of the drainage device is composed of a flexible pipe 17. The flexible pipe 17 is preferably a PVC transparent steel wire flexible pipe, and a stop valve 16 is arranged on the flexible pipe 17. A water receiving tank 18 is arranged at a water outlet of the flexible pipe 17, a filter screen 15 is arranged at an upper port of the water receiving tank 18, and a weighing sensor 19 is arranged at a lower end of the water receiving tank 18. The water receiving tank 18 is preferably a rectangular polymethyl methacrylate (PMMA) water tank, and the filter screen 15 is preferably a rectangular high efficiency particulate air (HEPA) filter screen.

[14] The horizontal flow velocity simulation device includes a stainless steel sprinkler 2 and a rotating mechanical device 11, the stainless steel sprayer 2 is connected to the rotating mechanical device 11 by means of a slender pipe, and the other end of the slender pipe is connected to a water suction pump 20 by means of a pipeline. The slender pipe is preferably a polyvinyl chloride (PVC) pipe. Water flow of the stainless steel sprinkler 2 is kept unchanged, and a rotation speed of the rotating mechanical device 11 is changed (rotation speed being 10 r / min40 r / min) to simulate a horizontal flow speed of the pavement during rainfall. The rotating mechanical device 11 is arranged on the piston rod 25, and the rotating mechanical device 11 is capable of moving up or down along with the piston rod 25, such that the stainless steel sprinkler 2 can. move down. to enter the simulation. barrel 1 or move up to leave the simulation barrel 1.

[15] The vehiclepavement coupling simulation device is composed of a customized lowfrequency waterproof bolt vibrator 4 and a digital display frequency modulation controller 5 which are connected, the customized low frequency waterproof bolt vibrator 4 is bonded on an upper surface of the permeable concrete test block 6 by means of waterproof glue, and the controller is intermittently adjusted to simulate the relative action generated between the running vehicles and the pavement.

[16] Upper and lower sides of the permeable concrete test block 6 are fixed on the simulation barrel 1 and are provided with an upper surface intelligent water pressure sensor 3 and a lower surface intelligent water pressure sensor 8 respectively, so as to calculate a permeability coefficient.

[17] Both sides of the permeable concrete test block 6 are coated with vaseline and then wrapped around an elastic rubber sleeve 7, and the permeable concrete test block is integrally mounted on the simulation barrel 1 and fixed by means of a flange connecting member 9.

[18] The rainwater runoff monitoring device is connected to a computer by means of an analogtodigital converter, the computer is utilized to monitor a purification effect of the test block on main pollutants in rainwater runoff in the whole process while clogging is simulated, and a relationship curve between the permeable concrete clogging and. the purification effect on the rainwater runoff is obtained. Clogging conditions of the permeable concrete under different environments are simulated by adding pollutants such as oil stains and heavy metals in different amounts.

[19] The sieving particle size of the filter screen 15 is 0.6 um, and the function is to filter out gravel in the water, so as to calculate the permeability coefficient more accurately.

[20] A using method of a device for simulating clogging and monitoring rainwater purification of permeable concrete pavement includes the following steps:

[21] S1: determine a permeability coefficient;

[22] S2: perform a sand grain and oil stain clogging test; and

[23] S3: monitor a purification effect of permeable concrete on rainwater runoff.

[24] The step of determining a permeability coefficient include the following steps:

[25] (11) Soak a permeable concrete test block 6 in a NaCl solution. for a period. of time to ensure that all pores are fully soaked.

[26] (12) Take out the permeable concrete test block 6, smear vaseline on the side surface, and mount the permeable concrete test block 111 a simulation. barrel 1 under assistance of an elastic rubber sleeve 7, where four ends of the permeable concrete test block 6 is fixed by means of flange connecting members 9.

[27] (13) Drive the piston rod 25 to move downwards by means of the hydraulic cylinder 24, such that a stainless steel sprinkler 2 moves downwards and enters the simulation barrel 1, stays at a proper height, open the customized stainless steel sprinkler 2 to start slow rotating water injection, and. when. the whole simulation barrel 1 is filled with water and the water overflows from the upper portion, open a stop valve 16 to make the water flow for a period of time to start the test.

[28] (14) Determine a hydraulic gradient J according to water pressure which is recorded online above and below the permeable concrete test block 6.

[29] I=§=¥

[30] The above formula is Formula I, where dh represents head loss, dl represents a test block thickness, h1 represents upper surface pressure of the test block, and he represents lower surface pressure of the test block.

[31] (15) Determine the mass of water discharged by the drainage device per unit time when the water flow is stable according to a (Neighing sensor 19 under za water receiving tank 18 to determine a Q value when the water flow is stable.

[32] (2:?

[33] The above formula is Formula 2, where mg represents the mass of the water flowing out in unit time t, p represents the density of the water, and t represents unit time.

[34] According to the Darcy's law, the formula is obtained:

[35] KZË

[36] The above formula is Formula 3, where mg represents the mass of the water flowing out in unit time t, p represents the density of time water, t represents unit time, and A represents the upper surface area of the test block.

[37] The sand grain and oil stain clogging test includes the following steps:

[38] (21) After the water permeability coefficient of the test block is determined, keep the water flow of the customized stainless steel sprinkler 2 unchanged, weigh dry sand with a certain mass and different particle sizes and pollutants such as oil stains and heavy metals with a certain mass, and uniformly pouring the dry sand and pollutants on the upper portion of the permeable concrete test block 6.

[39] (22) Observe the water flow at a water outlet of the drainage device, and since the porosity of the permeable concrete test block 6 is reduced. due to sand. and. dust clogging, after the flow is stable, calculate the permeability coefficient K of the test block by using Formula 3.

[40] (23) Study influence of an ambient temperature, a water head height, a horizontal flow velocity, gravel gradation, an environment and other factors on the anti clogging performance of the permeable concrete test block 6 by changing one of the following factors in the clogging process, that is, vibration factors caused by environmental conditions and traffic loads are simulated by controlling the addition amount of the pollutants such as oil stains and heavy metals.

[41] The step of monitoring a purification effect of permeable concrete on rainwater runoff includes the follow steps:

[42] (31) Connect an intelligent water quality COD sensor 12, an intelligent ammonia nitrogen sensor 13 and an intelligent water turbidity / SS sensor 14 to the computer by means of the analogtodigital converter, and monitor the purification condition of the test block on main pollution components in the runoff when the permeable concrete test block 6 is clogged.

[43] (32) Study influence of ana ambient temperature, a water head height, a horizontal flow velocity, gravel gradation, an environment and other factors on the anti clogging performance of the permeable concrete test block 6 by changing one of the following factors in the clogging process, that is, vibration factors caused by environmental conditions and traffic loads are simulated by controlling the addition amount of the pollutants such as oil stains and heavy metals.

[44] (33) Analyze a filtering effect of the permeable concrete test block 6 on the main pollution components in the rainwater runoff at different clogging stages by using the computer, and present filtering curves of COD, ammonia nitrogen and SS, which are used for studying mechanisms of permeable concrete clogging and rainwater runoff 5 purification.

Claims

1. A device for simulating clogging and monitoring rainwater purification of permeable concrete paving, comprising a fixed upright post, a telescopic upright pole, a blockage simulacrum drainage device, a rainwater discharge monitoring device and a drainage device, in which the fixed upright pole and the telescopic upright pole next to each other are fitted, with the telescopic upright pole comprises a hydraulic cylinder and a piston rod, where a lower end of the piston rod is attached brought into the hydraulic cylinder, whereby the hydraulic cylinder is able to drive the piston rod to moving up and down, simulating the blockage the device includes a simulation tank and an air conditioner, where the air conditioner is mounted on the fixed right upright pole, where the air conditioner is able to ambient temperature of the simulation vessel. to adjust, where the simulation vessel is fixed between the fixed upright pole and the telescopic upright pole, where a lower part of the simulation vessel is for seeing a drainage port, where an internal cavity of the simulation vessel is equipped with a permeable concrete test block, where a horizontal flow velocity simulation device is installed above the permeable concrete test block, where the horizontal flow velocity simulation is towards a stainless steel sprinkler and a rotating me mechanical device, in which the stainless steel sprinkler is connected to the rotating mechanical device by means of a slender tube, the other end of which of the slender tube is connected to a water suction pump by by means of a pipeline, in which the rotating mechanical device is fitted to the piston rod, whereby the ro mechanical device capable of moving upwards and to move down together with the piston rod, whereby a temperature detector is mounted on an inner wall of the simulation vessel, in which the temperature detector is installed above the permeable concrete test block, with an upper end of the permeable concrete test block is provided with a vehicle pavement coupling simulation device, where a lower end of the permeable concrete test block is equipped with the rainwater discharge monitoring direction, where the drainage port is connected to the drain post-installation, in which a main body of the drainage The device consists of a flexible tube, in which a stop valve is fitted to the flexible pipe, whereby a water receiving tank is fitted at a water outlet of the flexible tube with a filter screen attached to it an upper port of the water receiving tank, and where a weighing sensor is mounted at a lower end of the water receiving tank. OOO FIG. 1 S1 Determine a permeability coefficient S2 Perform a sand grain and oil stain clogging test S3 Monitor a purification effect of permeable concrete on rainwater runoff FIG. 2

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