An assembled permeable pavement system and a modification method for heavy metal adsorption of the assembled permeable pavement

Abstract

The present application relates to a kind of for heavy metal adsorption assembly type water-permeable pavement modification method and assembly type water-permeable pavement system.Assembly type water-permeable pavement system includes from bottom to top sequentially arranged impermeable concrete lower base, assembly type water-permeable concrete upper base and assembly type water-permeable concrete pavement;The assembly type water-permeable concrete upper base is the concrete base treated by assembly type water-permeable concrete interface modifier;The assembly type water-permeable concrete pavement is the concrete pavement treated by assembly type water-permeable concrete interface modifier.Compared with the prior art assembly type water-permeable pavement, the present application aims to solve the problem that traditional water-permeable pavement is difficult to capture heavy metal elements contained in rainwater continuously and effectively.The method and prefabricated panel system provided by the present application can effectively realize the adsorption of heavy metals in rainwater, improve the mechanical properties of water-permeable concrete, and effectively increase the adsorption area of the modifier by the prefabricated panel of the present application, improve the capture efficiency of heavy metal elements in rainwater by water-permeable pavement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated permeable pavement, in particular to a prefabricated permeable pavement modification method for heavy metal adsorption and a prefabricated permeable pavement system. BACKGROUND

[0002] Permeable pavement is an important low-impact development technology in the construction of sponge cities. Permeable concrete is prepared by special technology with specific gradation of aggregate. Due to the small amount of permeable concrete slurry and short initial setting time, it is not suitable to stay for a long time after mixing, so most of the permeable cement concrete is mixed on site. The on-site mixing of permeable cement concrete is usually accompanied by complex construction process, difficult construction quality control, long maintenance time and other problems. Prefabricated cement concrete has the advantages of short construction time, quick traffic opening, small traffic disturbance, simple maintenance and small environmental impact, and is widely used in rapid repair engineering or new engineering of airport, road, port and other engineering.

[0003] In addition, with the rapid development of industrialization, cities and industrial areas often face the challenge of heavy metal pollution in stormwater runoff. Among them, Pb, Cu, Zn, Ni and other heavy metals have acute toxicity to aquatic organisms and persist in the food chain, becoming an increasingly serious environmental hazard. Traditional permeable pavement is difficult to continuously and effectively capture heavy metal elements contained in surface runoff, and has certain limitations.

[0004] CN107021539A discloses a permeable pavement composite system for intercepting heavy metals, which comprises a permeable pavement and a post-treatment system. The permeable pavement comprises, from top to bottom, a permeable pavement layer, a permeable upper base layer, a permeable lower base layer, a cushion layer and a roadbed. The post-treatment system comprises a flow guide pipe, a horizontal filter column, a heavy metal adsorption material and a pipe maintenance well. The heavy metal adsorption material is a mixture of sodium titanate nanofiber and activated carbon particles. When it rains, rainwater carrying heavy metals is preliminarily filtered through the permeable pavement, then enters the post-treatment system for efficient adsorption and interception, and finally the effluent can be injected into the ground as clean water to supplement groundwater. However, this system uses a mixture of sodium titanate nanofiber and activated carbon particles for adsorption, which has the problems of complex permeable pavement construction and long construction period. SUMMARY

[0005] The present application is to overcome the defects of the prior art and provide a prefabricated permeable pavement modification method for heavy metal adsorption and a prefabricated permeable pavement system. The prefabricated permeable pavement modification method for heavy metal adsorption and the prefabricated permeable pavement system use a prefabricated permeable concrete interface modifier to treat the prefabricated permeable concrete upper base layer and the prefabricated permeable concrete pavement, solve the problem that the current permeable concrete cannot achieve efficient adsorption of heavy metals in rainwater, and solve the problems of complex permeable pavement construction and long construction period.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] The first object of the present application is to provide a heavy metal adsorption functional assembled permeable pavement system, which comprises a non-permeable concrete lower base, an assembled permeable concrete upper base and an assembled permeable concrete pavement arranged in sequence from bottom to top; the heavy metal adsorption rate of the heavy metal adsorption functional assembled permeable pavement system is greater than 70%; the assembled permeable concrete upper base is a concrete base treated by an assembled permeable concrete interface modifier; and the assembled permeable concrete pavement is a concrete pavement treated by an assembled permeable concrete interface modifier.

[0008] The heavy metal adsorption functional assembled permeable pavement system adopts a prefabricated standard section structure, can quickly realize assembly construction, reduces the construction period, and is simple and convenient for maintenance and repair of the pavement in the later period. At the same time, the surface of the pavement structure is treated during prefabrication, and when rainwater permeates the assembled permeable concrete pavement and the assembled permeable concrete upper base, the surface modification material can adsorb heavy metal elements in the rainwater. After the rainwater permeates the assembled permeable concrete pavement and the assembled permeable concrete upper base, it is quickly discharged through the rapid drainage system in the non-permeable concrete lower base, thereby reducing the burden of urban drainage facilities and preventing river flooding.

[0009] Further, the heavy metal adsorption functional assembled permeable pavement system further comprises a drainage pipe assembly arranged in the non-permeable concrete lower base.

[0010] Further, the drainage pipe assembly is a rapid drainage mechanism, which comprises a beam pipe installed in the non-permeable concrete lower base structure, vertical pipes uniformly distributed in the top slots of the beam pipe, and a filter screen installed on the beam pipe.

[0011] Further, the assembled permeable concrete interface modifier comprises water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%; and the pH of the assembled permeable concrete interface modifier is adjusted to be between 7.6 and 8.5 by a pH adjuster.

[0012] Further, the pH adjuster is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

[0013] Further, the preparation method of the assembled permeable concrete interface modifier comprises gradually adding diammonium hydrogen phosphate into water while stirring, mixing, adjusting the pH to 7.6-8.5, and then preparing.

[0014] Further, in the preparation method of the prefabricated pervious concrete interface modifier, the diammonium hydrogen phosphate is gradually added to the water while stirring to ensure that the diammonium hydrogen phosphate is completely dissolved and uniformly distributed in the solution.

[0015] Further, the prefabricated pervious concrete upper base layer comprises a pervious concrete prefabricated plate and a prefabricated component; and the pervious concrete prefabricated plate and the prefabricated component are connected.

[0016] Further, the pervious concrete prefabricated plate is in a triangular shape; a plurality of the pervious concrete prefabricated plates are connected through the prefabricated component; and the prefabricated pervious concrete upper base layer and the impermeable concrete lower base layer form a slope.

[0017] A second object of the present application is to provide a prefabricated pervious road surface modification method for heavy metal adsorption, which is used for preparing a prefabricated pervious road surface system with heavy metal adsorption function. The method comprises the following steps:

[0018] (1) performing surface cleaning on the concrete base layer and / or the concrete road surface;

[0019] (2) after the surface cleaning, uniformly applying a prefabricated pervious concrete interface modifier to the surface of the concrete base layer and / or the concrete road surface, and further obtaining the prefabricated pervious concrete upper base layer and / or the prefabricated pervious concrete road surface.

[0020] Further, for the prefabricated pervious concrete upper base layer, when a plurality of pervious concrete prefabricated plates are connected to obtain the prefabricated pervious concrete upper base layer, the method comprises the following steps:

[0021] (1) performing surface cleaning on the pervious concrete prefabricated plate;

[0022] (2) after the surface cleaning, uniformly applying a prefabricated pervious concrete interface modifier to the surface of the pervious concrete prefabricated plate, and connecting a plurality of the pervious concrete prefabricated plates through the prefabricated component to obtain the prefabricated pervious concrete upper base layer.

[0023] Further, the method specifically comprises the following steps (taking the prefabricated pervious concrete upper base layer as an example):

[0024] Step 1: preparing a prefabricated pervious concrete interface modifier, which is mainly composed of water and diammonium hydrogen phosphate, wherein the mass fraction of the diammonium hydrogen phosphate is 10%;

[0025] When the water and the diammonium hydrogen phosphate are mixed, the diammonium hydrogen phosphate should be gradually added while stirring, and the pH is adjusted to 7.6-8.5 after complete mixing.

[0026] The solution for adjusting pH should use 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0027] Step 2: Negative pressure treatment of the pervious concrete prefabricated slab, the pervious concrete prefabricated slab is placed at 25 DEG C and 133 Pa for 24 hours.

[0028] Step 3: Surface treatment of the pervious concrete prefabricated slab

[0029] Before the modification of the pervious concrete prefabricated slab, the surface of the slab needs to be cleaned to keep the surface clean and free of sundries.

[0030] The assembled pervious concrete interface modifier liquid is uniformly applied on the pervious concrete prefabricated slab, the application amount of each time is 0.054 g / cm 2 , the treatment times are 10 times, and the treatment interval is 24 h.

[0031] Further, the surface cleaning is realized by brush cleaning.

[0032] Further, in the interface modification method of the pervious concrete prefabricated slab, the step (2) is that after the surface cleaning step (1) of the pervious concrete prefabricated slab is finished, the modifier is uniformly applied on the surface of the pervious concrete prefabricated slab, the application amount of each time is controlled to be 0.054 g / cm 2 , the treatment times are 10 times, and the treatment interval is 24 h.

[0033] Further, the upper base layer of the assembled pervious concrete and / or the assembled pervious concrete pavement obtained in the step (2) is used for assembling the assembled pervious pavement system with the heavy metal adsorption function.

[0034] Further, the assembling of the assembled pervious pavement system with the heavy metal adsorption function comprises the following processes:

[0035] The drainage pipeline assembly is arranged in the impermeable concrete lower base layer.

[0036] A plurality of pervious concrete prefabricated slabs treated by the assembled pervious concrete interface modifier are connected by the assembling component to obtain an assembled pervious concrete upper base layer.

[0037] The assembled pervious concrete upper base layer is connected with the impermeable concrete lower base layer and forms a slope.

[0038] The assembled pervious concrete pavement is connected with the assembled pervious concrete upper base layer.

[0039] The impermeable concrete lower base layer, the assembled pervious concrete upper base layer and the assembled pervious concrete pavement are sequentially arranged from bottom to top.

[0040] The water-permeable concrete slab (water-permeable concrete precast slab) is pretreated in advance using a modifying substance, so as to have heavy metal adsorption capacity. In addition, a prefabricated water-permeable pavement precast slab (water-permeable concrete precast slab) is provided, which increases the surface modification area, optimizes the flow and flow rate of rainwater in the water-permeable pavement, improves the heavy metal adsorption efficiency, and constructs a prefabricated water-permeable concrete pavement precast slab which is simple to construct, has strong bearing capacity and can realize heavy metal adsorption function, and is used to assemble a prefabricated water-permeable pavement system with heavy metal adsorption function.

[0041] The prefabricated water-permeable concrete precast slab is combined with pavement slab modification. The first layer (prefabricated water-permeable concrete pavement) performs heavy metal adsorption pretreatment on rainwater, the second layer uses a triangular water-permeable concrete precast slab to collect rainwater, the triangular water-permeable concrete slab optimizes the flow and flow rate of rainwater to ensure effective adsorption of heavy metals in rainwater to the maximum extent (the purpose is to uniformly distribute rainwater in the water-permeable concrete), the rainwater is finally quickly discharged from the pavement structure through the third layer of impermeable pavement (impermeable concrete lower base) isolation and drainage pipeline.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] 1) The prefabricated water-permeable pavement modification method and prefabricated water-permeable pavement system for heavy metal adsorption provided by the technical solution can realize effective adsorption of heavy metal elements. The present application pretreats the water-permeable concrete with a phosphate solution and increases the surface modification area and improves the adsorption efficiency through the triangular water-permeable concrete precast slab, while achieving the purpose of controlling the flow path and flow rate of rainwater.

[0044] 2) The prefabricated water-permeable pavement modification method and prefabricated water-permeable pavement system for heavy metal adsorption provided by the technical solution can effectively improve the road bearing capacity. The water-permeable concrete interface modifier of the present application can effectively improve the strength of the water-permeable concrete.

[0045] 3) The prefabricated water-permeable pavement modification method and prefabricated water-permeable pavement system for heavy metal adsorption provided by the technical solution adopt a prefabricated structure, which is convenient to construct, reduces the impact of on-site construction on the surrounding environment, and ensures the construction quality. Compared with ordinary cast-in-place water-permeable concrete pavement, the construction period is shortened by 80%. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is a structural schematic view of the prefabricated water-permeable pavement system with heavy metal adsorption function of the present application.

[0047] Figure 2 It is a structural schematic view of the prefabricated water-permeable concrete upper base of the present application.

[0048] Figure 3 Structure diagram of the drainage pipe assembly of the present application.

[0049] Reference signs in the figure:

[0050] 1- impermeable concrete subbase, 2- assembled permeable concrete superbase, 3- assembled permeable concrete pavement, 4- drainage pipe assembly, 21- permeable concrete precast slab, 22- assembled component, 41- beam pipe, 42- vertical pipe, 43- filter screen. DETAILED DESCRIPTION

[0051] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present application, and gives a detailed implementation manner and specific operation process, but the protection scope of the present application is not limited to the following embodiments.

[0052] In the present application, features such as component model, material name, connection structure, control method, etc. that are not explicitly described are considered as common technical features disclosed in the prior art.

[0053] The present application relates to the technical field of assembled permeable pavement, and particularly refers to a disposal method for heavy metal adsorption of assembled permeable pavement and an assembled permeable concrete precast slab structure. The permeable pavement comprises, from top to bottom, a permeable pavement layer (assembled permeable concrete pavement 3), a permeable superbase (assembled permeable concrete superbase 2), a drainage pipe system (drainage pipe assembly 4), and a permeable subbase (impermeable concrete subbase 1). The permeable pavement layer and the permeable superbase are treated with a permeable concrete surface modifier, and the raw materials of the modifier include diammonium hydrogen phosphate and water. Meanwhile, the present application provides a permeable concrete precast slab (permeable concrete precast slab 21). Compared with the existing assembled permeable pavement, the present application aims to solve the problem that the traditional permeable pavement is difficult to continuously and effectively capture heavy metal elements contained in rainwater. The method and precast slab system provided by the present application can effectively realize the adsorption of heavy metals in rainwater, improve the mechanical properties of permeable concrete, and effectively increase the adsorption area of the modifier through the precast slab of the present application, thereby improving the capture efficiency of heavy metal elements in rainwater. In addition, the modification method provided by the present application is convenient, and there is no significant safety hazard in the modification process. The precast slab is simple to construct, has good economy and construction convenience.

[0054] EMBODIMENT

[0055] REFERENCE Figures 1-2The embodiment provides an assembled water-permeable pavement system with heavy metal adsorption function, which comprises a water-impermeable concrete lower base layer 1, an assembled water-permeable concrete upper base layer 2 and an assembled water-permeable concrete pavement 3 arranged in sequence from bottom to top, and a drainage pipeline assembly 4 arranged in the water-impermeable concrete lower base layer 1; the heavy metal adsorption rate of the assembled water-permeable pavement system with heavy metal adsorption function is greater than 70%; the assembled water-permeable concrete upper base layer 2 is a concrete base layer treated by an assembled water-permeable concrete interface modifier; and the assembled water-permeable concrete pavement 3 is a concrete pavement treated by the assembled water-permeable concrete interface modifier.

[0056] The assembled water-permeable concrete interface modifier comprises water and diammonium hydrogen phosphate, wherein the mass fraction of the diammonium hydrogen phosphate is 10%; and the pH of the assembled water-permeable concrete interface modifier is adjusted to be between 7.6 and 8.5 by a pH regulator.

[0057] The pH regulator is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

[0058] The preparation method of the assembled water-permeable concrete interface modifier comprises gradually adding diammonium hydrogen phosphate into water while stirring, mixing, adjusting the pH to 7.6-8.5, and then obtaining; in the preparation method of the assembled water-permeable concrete interface modifier, the diammonium hydrogen phosphate needs to be gradually added into water while stirring, so as to ensure that the diammonium hydrogen phosphate is completely dissolved and uniformly distributed in the solution.

[0059] The assembled water-permeable concrete upper base layer 2 comprises water-permeable concrete prefabricated plates 21 and assembling components 22; and the water-permeable concrete prefabricated plates 21 and the assembling components 22 are connected. The shape of the water-permeable concrete prefabricated plates 21 is triangular; a plurality of water-permeable concrete prefabricated plates 21 are connected by the assembling components 22; and the assembled water-permeable concrete upper base layer 2 and the water-impermeable concrete lower base layer 1 form a slope, so as to optimize the rainwater flow path and ensure that the rainwater is quickly discharged from the pavement through the drainage system 2.

[0060] The embodiment further provides an assembled water-permeable pavement modification method for heavy metal adsorption, which is used for preparing the assembled water-permeable pavement system with heavy metal adsorption function. The method comprises the following steps:

[0061] (1) performing surface cleaning on a concrete base layer and / or a concrete pavement;

[0062] (2) after the surface cleaning, uniformly applying an assembled water-permeable concrete interface modifier on the surface of the concrete base layer and / or the concrete pavement, and further obtaining the assembled water-permeable concrete upper base layer 2 and / or the assembled water-permeable concrete pavement 3.

[0063] The method specifically comprises the following steps (assembled pervious concrete upper base 2) :

[0064] Step 1: prepare an assembled pervious concrete interface modifier mainly composed of water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%;

[0065] When water and diammonium hydrogen phosphate are mixed, diammonium hydrogen phosphate should be gradually added while stirring, and after complete mixing, the pH is adjusted to between 7.6 and 8.5.

[0066] The solution for adjusting the pH should use a 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0067] Step 2: negative pressure treatment of the pervious concrete precast slab 21, place the pervious concrete precast slab 21 at 25°C and 133 Pa for 24 hours.

[0068] Step 3: surface treatment of the pervious concrete precast slab 21

[0069] Before modifying the pervious concrete precast slab 21, a brush is used to clean the surface of the slab to keep the surface clean and free of debris.

[0070] The assembled pervious concrete interface modifier liquid is evenly applied to the pervious concrete precast slab 21, with a usage of 0.054 g / cm 2 , the treatment is performed 10 times with an interval of 24 hours, and the treated multiple pervious concrete precast slabs 21 are connected by assembly components 22 to obtain the assembled pervious concrete upper base 2.

[0071] The method specifically comprises the following steps (assembled pervious concrete pavement 3) :

[0072] Step 1: prepare an assembled pervious concrete interface modifier mainly composed of water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%;

[0073] When water and diammonium hydrogen phosphate are mixed, diammonium hydrogen phosphate should be gradually added while stirring, and after complete mixing, the pH is adjusted to between 7.6 and 8.5.

[0074] The solution for adjusting the pH should use a 3.5 mol / L or 0.1 mol / L sodium hydroxide standard solution.

[0075] Step 2: negative pressure treatment of the concrete pavement, place the concrete pavement at 25°C and 133 Pa for 24 hours.

[0076] Step 3: concrete pavement surface treatment, before the modification of the concrete pavement, the pavement needs to be cleaned with a brush to keep the pavement surface clean and free of debris.

[0077] The assembled pervious concrete interface modifier liquid is evenly applied on the concrete pavement, and the amount of each application is 0.054g / cm 2 , the treatment frequency is 10 times, the treatment interval is 24h, and the assembled pervious concrete pavement 3 is obtained.

[0078] The assembly of the heavy metal adsorption functional assembled pervious pavement system includes the following processes:

[0079] The drainage pipe assembly 4 is arranged in the impervious concrete lower base layer 1.

[0080] A plurality of pervious concrete prefabricated slabs 21 treated by the assembled pervious concrete interface modifier are connected by assembly components 22 to obtain an assembled pervious concrete upper base layer 2.

[0081] The assembled pervious concrete upper base layer 2 is connected with the impervious concrete lower base layer 1 and forms a slope.

[0082] The assembled pervious concrete pavement 3 is connected with the assembled pervious concrete upper base layer 2.

[0083] The impervious concrete lower base layer 1, the assembled pervious concrete upper base layer 2 and the assembled pervious concrete pavement 3 are arranged from bottom to top.

[0084] The drainage pipe assembly 4 is arranged close to the lower end of the assembled pervious concrete upper base layer 2.

[0085] In this embodiment, the impervious concrete lower base layer 1 is a C20 concrete base layer, the total thickness of the impervious concrete lower base layer 1 is preferably 150mm, the strength of the pervious concrete prefabricated slab 21 of the assembled pervious concrete upper base layer 2 is not less than C25, the total thickness of the assembled pervious concrete upper base layer 2 is 100mm, the assembly component 22 is a conventional assembly-to-slab connecting component, the assembled pervious concrete pavement 3 is a concrete base layer with a surface layer grade not less than C30, and the total thickness of the assembled pervious concrete pavement 3 is 180mm.

[0086] As shown in Figure 3 , the drainage pipe assembly 4 is a rapid drainage mechanism, which includes a beam pipe 41 installed in the structure of the impervious concrete lower base layer 1, vertical pipes 42 evenly distributed on the top slots of the beam pipe, and a filter screen 43 installed on the beam pipe, which is a conventional filter screen.

[0087] When it rains, the rainwater carrying heavy metals flows through the assembled pervious concrete pavement 3, and the pollutants and heavy metals are preliminarily filtered; the rainwater flows through the assembled pervious concrete upper base layer 2, the triangular structure of the assembled pervious concrete upper base layer 2 is used to re-regulate the flow and speed of the rainwater, and the heavy metal adsorption efficiency of the rainwater is improved; and the rainwater is quickly discharged from the road structure through the drainage pipe assembly 4 on the impervious concrete lower base layer 1.

[0088] Comparative Example

[0089] The present comparative example provides a pervious pavement system, which is compared with the embodiment, and the present comparative example does not treat the surface of the pervious concrete prefabricated slab 21, and other settings are basically the same.

[0090] The pavement systems in the embodiment and the comparative example are subjected to simulation tests, the heavy metal adsorption effects of the surface-modified pervious concrete and the un-surface-modified pervious concrete are simulated in a laboratory, the pervious concrete is directly soaked in a heavy metal solution, 1L of 500mg / L of Zn 2+ After soaking for 4 hours, the heavy metal ions potentially adhered to the surface of each test piece are immediately washed away by using 1L of pure water to flush above the beaker of each test piece, the residual solution after reaction of each test piece is obtained, and the treatment effects of the modified pervious concrete (the heavy metal adsorption functional assembled pervious pavement system of the embodiment and the pervious pavement system of the comparative example) are shown in Table 1 as follows:

[0091] Table 1 Treatment effects of the modified pervious concrete of the embodiment and the comparative example.

[0092] Sample No. Original zinc element concentration (mg / L) Zinc element concentration after immersion Compressive strength (MPa) 1 Example 500.00 139.72 32.61 2 Comparative Example 500.00 218.91 29.18

[0093] As shown in Table 1, the zinc interception rate of the embodiment reaches more than 72%, while the zinc interception rate of the comparative example only reaches 56%, and the method of the present application has obvious advantages. In addition, the compressive strength of the embodiment is improved compared with the comparative example.

[0094] The above description of the embodiment is for the purpose of facilitating the understanding and use of the present application by those skilled in the art. Those skilled in the art can easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without having to go through creative labor. Therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present application should be within the protection scope of the present application.

Claims

1. A heavy metal adsorption functional assembled permeable pavement system, characterized in that, The heavy metal adsorption function assembly type permeable pavement system comprises, from bottom to top, a non-permeable concrete lower base layer (1), an assembly type permeable concrete upper base layer (2) and an assembly type permeable concrete pavement (3); The heavy metal adsorption rate of the heavy metal adsorption function assembly type permeable pavement system is greater than 70%; The assembly type permeable concrete upper base layer (2) is a concrete base layer treated by an assembly type permeable concrete interface modifier; The assembly type permeable concrete pavement (3) is a concrete pavement treated by an assembly type permeable concrete interface modifier; The heavy metal adsorption function assembly type permeable pavement system further comprises a drainage pipe assembly (4) arranged in the non-permeable concrete lower base layer (1); The assembly type permeable concrete interface modifier comprises water and diammonium hydrogen phosphate, wherein the mass fraction of diammonium hydrogen phosphate is 10%; The pH of the assembly type permeable concrete interface modifier is adjusted to be between 7.6 and 8.5 by a pH adjuster; The preparation method of the assembly type permeable concrete interface modifier comprises gradually adding diammonium hydrogen phosphate into water while stirring, mixing, adjusting the pH to 7.6-8.5, and then obtaining; The assembly type permeable concrete interface modifier is uniformly applied to the surface of the concrete base layer and the concrete pavement to obtain the assembly type permeable concrete upper base layer (2) and the assembly type permeable concrete pavement (3).

2. The heavy metal adsorption functional assembled pervious pavement system according to claim 1, characterized in that, The pH adjuster is selected from one or more of a 3.5 mol / L sodium hydroxide standard solution and a 0.1 mol / L sodium hydroxide standard solution.

3. The heavy metal adsorption functional assembled pervious pavement system according to claim 1, characterized in that, The assembly type permeable concrete upper base layer (2) comprises a permeable concrete prefabricated slab (21) and an assembly component (22); The permeable concrete prefabricated slab (21) and the assembly component (22) are connected.

4. The heavy metal adsorption functional assembled pervious pavement system according to claim 3, characterized in that, The permeable concrete prefabricated slab (21) is in the shape of a triangle; A plurality of permeable concrete prefabricated slabs (21) are connected by assembly components (22); The assembly type permeable concrete upper base layer (2) forms a slope with the non-permeable concrete lower base layer (1).

5. A method for modifying the heavy metal adsorbing assembly type permeable pavement for heavy metal adsorption of the heavy metal adsorbing function assembly type permeable pavement system according to any one of claims 1 to 4, characterized by, The modification method comprises the following steps: (1) cleaning the surface of the concrete base layer and the concrete pavement; (2) uniformly applying the assembly type permeable concrete interface modifier to the surface of the concrete base layer and the concrete pavement to obtain the assembly type permeable concrete upper base layer (2) and the assembly type permeable concrete pavement (3).

6. The method according to claim 5, wherein the method is characterized by, The uniform application process is as follows: 0.054 g / cm2 per application 2 , 10 times of treatment, 24 h of treatment interval.

7. The method according to claim 6, wherein the method is characterized by, The assembly type permeable concrete upper base layer (2) and the assembly type permeable concrete pavement (3) obtained in step (2) are used to assemble the heavy metal adsorption function assembly type permeable pavement system.

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