CN111549603A

CN111549603A - Pavement considering water load coupling and construction method thereof

Info

Publication number: CN111549603A
Application number: CN202010207726.8A
Authority: CN
Inventors: 杨文领; 徐倩
Original assignee: Zhejiang College of Construction
Current assignee: Zhejiang College of Construction
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-08-18

Abstract

The invention discloses a sidewalk pavement considering water load coupling and a construction method thereof, wherein the sidewalk pavement comprises a graded broken stone cushion layer, a permeable cement stabilized broken stone base layer, a permeable mortar connection layer and permeable bricks which are sequentially paved from the soil foundation from bottom to top; wherein, aggregate of the permeable cement stabilized macadam base layer adopts graded macadam, and the cement content is 5.5-7%; the grain size of stone chips of the permeable mortar connecting layer is 3-5 mm, and the ratio of cement to the stone chips is 1: 5-1: 6. The construction method comprises the steps of soil foundation construction, cushion layer construction, base layer construction, leveling layer construction and surface layer construction, wherein graded broken stones are used as aggregate during base layer construction, and the graded broken stones and cement are blended and stirred to obtain the permeable cement stabilized broken stone base layer. The invention has the advantages that: aggregate of the permeable cement stabilized macadam base structure adopts carefully controlled graded macadam, and the permeable pavement has good compressive strength under the condition of meeting the requirement of permeability coefficient.

Description

Pavement considering water load coupling and construction method thereof

Technical Field

The invention belongs to the field of road and bridge structures, and particularly relates to a sidewalk pavement considering water load coupling and a construction method thereof.

Background

China has a large population, and in order to meet the increasing material demand of people, the urbanization process is accelerated year by year, which leads to the enlargement of urban area, the high density of population and the high utilization of land, and the impervious areas such as buildings, hardened pavements and the like occupy the great proportion of the urban area, and in the cities, rainfall basically enters an underground pipe network through surface runoff and is discharged into rivers and urban inland rivers. When the rainfall is large or the duration is long, the pressure of the urban drainage pipe network is increased, so that surface water cannot be drained and accumulated quickly, serious inland water logging disasters are generated, the normal operation of cities is influenced, and even serious casualty accidents are caused.

At present, most of urban sidewalk construction in Hangzhou city is mainly made of watertight structures and paved by sidewalk boards. According to the sidewalk structure, the road plate is easy to warp and loosen, when rainfall is large, the problem of drenching of the road plate due to water accumulation on the road surface and loosening after rain exists, and the using performance of the sidewalk is seriously influenced.

The main reason for this problem is the impermeability of the pavement. When raining, rainwater enters the pavement base layer through the gaps of the road plate bricks. Because of the impermeability of the structure, the infiltration rainwater will fill up the tiny gaps on the surface of the base layer, the ultra-static pore pressure generated under the action of external dynamic load and the action of freeze-thaw cycle will destroy the internal structure of the base layer. Especially, the joint of the road plate is washed by rainwater, the bottom plate peeling particles can be taken away, so that the bottom is hollow, the sludge phenomenon is generated, and the possibility of the road plate fracture is greatly increased. So far, the service performance of the sidewalk is greatly reduced.

The permeable sidewalk is divided into three types of permeable bricks, permeable concrete and permeable asphalt concrete from the surface layer type, and divided into a full-permeable type and a semi-permeable type from the base layer type. The semi-permeable base layer, namely the base layer, has no permeable function, and the ground rainfall penetrates into the bottom soil and directly enters the municipal rainwater collection system along the surface gradient of the base layer after penetrating through the surface layer.

Therefore, the pavement of the water permeable sidewalk can increase the 'sponge body' characteristic of the city to a greater extent, reduce the hardening area of the city in a great sense, enrich the underground water, improve the urban environment and the walking comfort, and has an immeasurable effect on the sustainable development of the city.

In 1997, national promulgated the first industry standard of Highway drainage design Specification (JTJ 018-97), and a great number of ideas and design methods for building internal drainage systems, pavement edge drainage systems and central separation zone drainage systems of pavement structures in developed countries in Europe, America and the like are introduced. Due to the limitation of the engineering practice and research conditions at the time, the parameter matching in the road drainage design specification is not enough, a plurality of improvements are provided in certain specified refinement aspects, and specific operation details and data ranges cannot give clear values. In addition, the territory of China is vast, the climatic and rainfall conditions are greatly different, and the drainage pavement structure is different. Due to differences of regions and climatic conditions, the composition of the drainage base material and the combination design of the drainage pavement structure should be intensively studied so as to provide reference for building water-permeable grounds in different regions.

Taking Hangzhou as an example, Hangzhou belongs to subtropical monsoon climate areas, thunderstorms are more in summer, the concentrated rainfall condition is serious, for example, in 2013, when typhoid lands, the Hangzhou rainfall reaches 161.6mm, and serious waterlogging occurs in the whole urban area. Meanwhile, in recent years, continuous drought conditions in Hangzhou summer are also serious, 2013 even artificial rainfall has to be carried out to relieve drought, and a sidewalk structure has to have enough water storage capacity to meet the requirement of water evaporation in high-temperature weather. In winter, the lowest temperature is below zero, and the pavement structure has frost heaving problem. In addition, the Hangzhou soil property condition is poor, the soil foundation is mainly silt soil, the strength is low, the permeability coefficient is low, and the underground water level is higher.

The above factors are considered comprehensively, and the design of the water permeable sidewalk in Hangzhou areas must meet the following requirements:

(1) firstly, the requirement of bearing capacity is met, and the drainage capacity of the sidewalk is improved as much as possible on the basis of sufficient strength;

(2) has good water permeating and storing functions;

(3) the selected surface material and the soil foundation in the freezing range should have frost heaving resistance;

(4) a soil foundation of sufficient strength.

The utility model discloses a grant utility model patent that bulletin number is CN209836734U discloses a sidewalk permeates water, including the pavement main part, still including installing the water conservancy diversion subassembly in pavement main part both sides, the water conservancy diversion subassembly includes the guiding gutter and installs the apron at the guiding gutter top, and the inlet opening that the apron that flows in and the water supply stream flowed in is seted up at the top of apron, and the both sides of guiding gutter all are provided with the direction inclined plane. When ponding is produced on the sidewalk in rainy days, the ponding can guide rainwater to other places through the guiding gutter, so that the ponding produced on the sidewalk is avoided. The water-permeable sidewalk is used for conveying water through the additionally arranged flow guide assembly, but the water permeability of the water-permeable sidewalk is not considered, and the problem that the mechanical strength of the water-permeable sidewalk is insufficient under the condition of slow water permeability or water accumulation is not considered.

Disclosure of Invention

The invention aims to solve the problem that the existing permeable sidewalk is insufficient in strength, and provides a sidewalk pavement considering water load coupling.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pavement considering water load coupling comprises a graded broken stone cushion layer, a permeable cement stabilized broken stone base layer, a permeable mortar connecting layer and permeable bricks which are sequentially paved from the soil base from bottom to top; wherein, aggregate of the permeable cement stabilized macadam base layer adopts graded macadam, and the cement content is 5.5-7%; the grain size of stone chips of the permeable mortar connecting layer is 3-5 mm, and the ratio of cement to the stone chips is 1: 5-1: 6.

Preferably, the graded crushed stone pad has a thickness of 10 cm.

Preferably, the thickness of the permeable cement stabilized macadam foundation is controlled to be 15 cm-30 cm.

Preferably, the thickness of the tie layer is 3 cm.

Preferably, the cement is 425# cement, and the water cement ratio is 0.40-0.42.

Preferably, a layer of medium coarse sand or stone chips is further paved between the graded broken stone cushion layer and the permeable cement stabilized broken stone base layer.

The invention also provides a construction method of the pavement considering water load coupling, which comprises the following steps:

s1: constructing a soil foundation, namely filling and compacting low-liquid-limit clay soil, low-liquid-limit silty soil and coarse-grained soil in a layered manner;

s2: constructing a cushion layer, and filling graded broken stones with the thickness of 10cm on a soil foundation;

s3: constructing a base layer, preparing graded broken stone aggregate additionally, mixing the broken stone aggregate with cement, controlling the cement content to be 5.5-7 percent and the water cement ratio to be 0.40-0.42, immediately transporting, paving on a cushion layer and rolling after mixing, controlling the thickness of the base layer to be 15-30 cm, and curing after the construction of the base layer is finished;

s4: leveling layer construction, namely mixing stone chips with the particle size of 3-5 mm with cement in a ratio of 1: 5-1: 6, paving on a base layer according to a ground tile datum line, and leveling to obtain a layer with the thickness of 3 cm;

s5: and (3) constructing a surface layer, namely paving water permeable bricks on the leveling layer by adopting a forward paving method, and compacting the surface bricks and filling sand into joints after paving.

Preferably, in the step S3, the loose coefficient in the paving process is 1.18-1.2.

Preferably, in step S3, a compaction process should be performed with a compact compactor tool not less than 20 kN.

Preferably, in step S3, the health preserving period is not less than 7 days, and the wet state is always maintained.

Compared with the prior art, the invention has the beneficial effects that:

(1) the cement-stabilized macadam foundation structure has a permeable cement-stabilized macadam foundation structure, and aggregates of the cement-stabilized macadam foundation structure adopt carefully controlled graded macadams, so that the permeable pavement has good compressive strength under the condition that the pavement meets the requirement of permeability coefficient;

(2) the structure of the pervious cement stabilized macadam base layer, the cement mortar connecting layer and the pervious brick not only has good water permeability, but also has a water storage function, and the urban heat island effect is relieved in summer;

(3) when the base layer is constructed, graded broken stones are used as aggregates, and the aggregates are mixed with cement to obtain a permeable cement stabilized broken stone base layer with good compressive strength and water permeability;

(4) when the leveling layer is constructed, the stone chips and the cement are mixed, the strength of the permeable cement stabilized macadam base structure is improved, and paving is made for laying of permeable bricks.

Drawings

Fig. 1 is a schematic structural diagram of a pavement considering water load coupling according to an embodiment of the invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

As shown in fig. 1, the sidewalk pavement considering water load coupling according to the embodiment of the present invention includes a graded broken stone cushion layer 101, a permeable cement stabilized broken stone base layer 102, a permeable mortar joint layer 103 and permeable bricks 104, which are sequentially laid from bottom to top from an earth base 100; wherein, the aggregate of the permeable cement stabilized macadam base 102 is graded macadam, and the cement content is 5.5-7%; the grain diameter of the stone chips of the permeable mortar connecting layer 103 is 3-5 mm, and the ratio of cement to the stone chips is 1: 5-1: 6.

Graded broken stone cushion 101: a layer of graded broken stone with the thickness of 10cm is paved on the soil foundation 100 to be used as a foundation of a drainage base layer, and in order to ensure certain compactness, the broken stone with good grading is selected.

Permeable cement stabilized macadam base 102: the permeable cement stabilized macadam base layer is open graded, the structural strength mainly refers to the embedding and squeezing effect between coarse aggregates and the adhesive force of cement paste, on the basis of meeting the strength, the permeable cement stabilized macadam base layer should have a larger void ratio as far as possible, and in order to achieve the largest possible water permeability, the aggregates should contain no or a small amount of fine aggregates. Therefore, in order to ensure the strength and the water permeability of the cement stabilized macadam mixture, the aggregate grading design must be considered.

The grading design of the permeable cement stabilized macadam is different from the grading design of the traditional dense grading cement stabilized macadam, the traditional cement stabilized macadam requires the compactness of the mixture to be larger, and meanwhile, the void ratio is as small as possible so as to meet certain mechanical strength. However, the permeable cement stabilized macadam not only requires mechanical strength, but also must have a certain porosity in order to satisfy a certain water permeability so as to satisfy the national building standard design drawing set: the effective porosity of the cement stabilized macadam permeable basic layer is not less than 10% in the paving of the urban road permeable sidewalks (10MR 204). But the material strength can be gradually reduced due to the larger porosity, so that the permeable cement stabilized macadam needs to be graded, and the mechanical strength and the porosity of the permeable cement stabilized macadam are ensured to reach ideal levels.

In order to ensure that the base layer can meet certain drainage requirements, materials with enough strength, good water permeability and good water stability are selected, graded broken stones, permeable cement concrete and permeable cement are adopted to stabilize the broken stone base layer, and the thickness of the base layer is controlled to be 15 cm-30 cm. In this example, the gradation composition of the aggregate of the permeable cement stabilized macadam foundation is shown in table 1:

TABLE 1 gradation table of aggregate of permeable cement stabilized macadam base

In order to ensure the bonding strength of the cement paste, the cement content of the cement stabilized macadam foundation gradation 1 is 5.5%, and the cement content of the gradation 2 is 7%. Considering the time from the beginning of adding water to the time of transportation, spreading and rolling, the time is generally required to be controlled within 3-4 hours, and the 425# ordinary portland cement with longer final setting time is preferably selected, and the water cement ratio is controlled between 0.40-0.42.

The grading composition has larger influence on the compressive strength of the cement stabilized macadam base, and compared with different permeable cement stabilized macadam grading, the steeper the grading curve is within the range of 9.5 mm-19 mm, the grading distribution is about uniform, large and small aggregates can be mutually embedded and extruded, and the compressive strength is larger under the bonding action of cement paste. The technical specification of highway pavement base course construction (JTJ034-2000) specifies that when the cement stabilized base course is applied to a second-level or lower highway, the 7d unconfined compressive strength is 2.5-3.0 MPa. As can be seen from Table 2, the experimental results of both the two gradations are greater than the strength requirement of the cement stabilized aggregate (aggregate) base course in the technical Specification for construction of asphalt road surfaces of highways.

TABLE 27 d unconfined compressive Strength

The void ratios of the two gradations are measured by adopting an underwater gravity method, the results are between 11 and 24 percent, the average value is 17 percent, and the requirement that the effective void ratio of the cement-stabilized macadam permeable basic layer in the national building standard design drawing set, namely the paving of urban road permeable sidewalks (10MR204) is not less than 10 percent is met.

Water-permeable mortar bond ply 103: the connecting layer plays the role of leveling and forming a tight interlocking function for the surface layer in the permeable sidewalk pavement structure. The connecting layer material can be sand cushion layer, cement mortar or cement stone chips and the like according to the load and the use condition of the pavement structure. The cement adopted in the embodiment is 425# ordinary portland cement, and the particle size of the stone chips is 3-5 mm. In order to balance the relationship between strength and permeability, the proportion range of the cement and the stone chips of the connecting layer is 1: 5-1: 6, the average effective porosity is 6%, the requirements of Beijing permeable sidewalk design and construction technical guidance and road sidewalk design and construction quality acceptance criteria are met, and the strength requirement of highway asphalt pavement construction technical criteria on cement-stabilized aggregate materials is also met.

Water permeable brick 104: the brick body of the permeable brick is provided with porous concrete with communicated pores, water can permeate through the brick body, and the requirement of the existing permeable brick industry standard JC/T945-2005 permeable brick on the permeability coefficient of the permeable brick is not less than 0.01 cm/s. The permeable bricks need to have enough compressive strength under the action of directly bearing the load of pedestrians or small vehicles on the upper part, and JC/T945-2005 permeable brick requires that the compressive strength of the permeable bricks is not less than 30 MPa. The embodiment selects the prefabricated water permeable brick.

The permeable pavement structure of the embodiment specifically comprises: the concrete water-permeable concrete composite material comprises a 10 cm-level broken stone cushion layer 101, a 20 cm-level 5% water-permeable cement-stabilized broken stone base layer 102, a 3cm M10 cement mortar connecting layer 103 and a 6 cm-thick Dutch water-permeable brick 104, wherein the total thickness is 39 cm. The cross section of the structure diagram of the road surface is shown in figure 1. Meanwhile, a layer of medium coarse sand or stone chips is laid between the graded broken stone cushion layer and the permeable cement stabilized broken stone base layer, so that larger gaps on the surface of the graded broken stone can be filled, the compaction degree of the drainage base layer is prevented from being influenced by the unevenness of the top surface of the drainage base layer, and meanwhile, part of lower-layer soil can be properly prevented from moving up to the inside of the drainage base layer.

The construction method of the pavement considering water load coupling of the embodiment of the invention comprises the following steps:

s1: and (3) constructing a soil foundation, namely filling and compacting the low-liquid limit clay soil, the low-liquid limit silty soil and the coarse-grained soil in a layered manner.

The soil foundation is filled by adopting low-liquid-limit clay, low-liquid-limit silty soil and coarse-grained soil which meet the requirements in a layered mode, a proper compaction tool is selected for compaction according to the actual situation on site, and the requirement on the compaction degree is not less than 90% of the light compaction standard. The compacted and formed soil foundation surface is smooth and free of water blocking phenomenon, and phenomena such as springs, waves and looseness cannot occur.

S2: and (5) constructing a cushion layer, and filling graded broken stones with the thickness of 10cm on the soil foundation.

The method comprises the steps of filling 10 cm-thick graded broken stones on a soil foundation, firstly determining the width and thickness of the pavement, controlling side lines by adopting stay wires, and controlling the thickness by adopting an elevation measuring method.

S3: and constructing a base layer, preparing graded broken stone aggregate in addition, mixing the broken stone aggregate with cement, immediately transporting, paving on a cushion layer and rolling after mixing, wherein the thickness of the base layer is controlled to be 15-30 cm, and the base layer needs to be maintained after the construction is finished.

When the drainage base layer mixture is mixed, the mixing proportion of various raw materials is strictly controlled, and the mixture is mixed by adopting a centralized plant mixing method. The method comprises the steps of firstly checking a metering device of mixing equipment, measuring the natural water content of each grade of aggregate before mixing every day so as to control the water adding amount, controlling the water-cement ratio between 0.40 and 0.42, carrying out visual inspection on each plate of discharged materials by technicians with certain experience, comparing the discharged materials with mixed materials in a test room, and immediately finding out reasons if the water-cement ratio is obviously too large or too small, and adjusting in time. The duration from the beginning of adding water to the transportation, paving and rolling molding is considered in the mixing process, and the mixing is generally required to be completed within 3-4 hours according to the characteristics of ordinary portland cement, so that the mixing output is consistent with the construction speed on site.

When in paving, the loose paving coefficient is firstly determined, and according to the related construction experience in the past, the construction time of a general grader is about 1.18, the construction time of a paver is about 1.15, and the construction time of artificial paving is about 1.2. And selecting the elm coefficient reference value according to a field paving mode to perform elevation control lofting (longitudinal slope and transverse slope should be considered). The graded crushed stone and various lateral confinement structure surfaces are then wetted to enhance bonding with the mix. The mixture is transported to a paving place by a dump truck, a shovel is used for shoveling the mixture to be paved immediately, the surface is scraped by a long wooden scraper according to the requirement of loose paving elevation, and more shovels and less supplements are needed, taking care that obvious segregation does not occur on the surface.

The mixture after being stricken off should be compacted immediately, under the condition that the working face of the scene allows, according to the past experience, can adopt 8T double steel wheel road roller to roll for 2 times, appear wheel track and edge uneven position and use the small-scale flat rammer to compact. Under the condition that the steel wheel road roller cannot be used, a small compaction machine tool not less than 20kN is adopted for compaction, and the compaction times can be controlled according to the change of the site elevation.

After the drainage base layer is rolled and qualified by elevation acceptance, the drainage base layer is required to be moisturized and maintained in time, and materials such as plastic films, linen, straw bags, geotextiles and the like can be generally adopted. And (3) timely watering and maintaining the cement after the cement reaches final setting, wherein the maintenance period is not less than 7 days, and the cement is kept in a wet state all the time. During the health preserving period, certain measures are taken to close the traffic and assign a specially-assigned person to take care.

S4: and (3) leveling layer construction, namely mixing the stone chips with the grain size of 3-5 mm with cement in a ratio of 1: 5-1: 6, paving on the base layer according to the datum line of the floor tiles, and leveling to obtain the layer with the thickness of 3 cm.

The following preparation work should be done in advance before the spreading and leveling layer:

a. removing pumice, sundries and the like on the base course of the pavement;

b. tensioning a horizon according to a datum line of the floor tiles;

c. and paving the leveling layer according to a stretched leveling line, wherein the leveling line is the top surface of the sand cushion layer with virtual paving thickness.

The construction method for spreading and leveling layer mainly includes 3 kinds, i.e. scraper method, raking method and spreading machine spreading method.

(1) Method of scraping

The construction of the scraper method is as follows, and it consists of 4 fixed frames, 2 guide rods and 1 scraper. The using method comprises the following steps:

firstly, uniformly spreading the cushion sand, wherein the thickness of the cushion sand is slightly higher than the elevation of the virtual pavement;

secondly, fixing 4 fixing frames on the base layer or the curbstones at two sides according to the required elevation;

thirdly, 2 round iron pipe guide rods are arranged on the fixed frame (the length of the guide rod is better to cross the sidewalk at one time), and then the fixed frame is used for fixing the round iron pipe guide rods

A scraper (generally about 3m in length) is placed on the guide rod, so that the bottom of the scraper is as high as the virtual paving thickness level line of the cushion sand;

and scraping the bedding sand by using a scraper along the guide rod (the scraper can not be separated from the guide rod all the time).

The scraper method is mainly characterized in that the surface of the sand cushion layer is relatively flat, the initial compaction degree is relatively uniform, the elevation control of the fixing frame is relatively strict and the fixing is firm, and the time is relatively long when the sand cushion layer is laid.

(2) Raking method

Stretching a criss-cross virtual paving thickness level line with a distance of 3-4 m, and raking the sand by using a rake to enable the top surface of the sand to be as high as the level line. The main disadvantage is represented by the greater construction variability in terms of material segregation and initial compaction.

(3) Spreading method of spreading machine

The method is suitable for the construction of the sand cushion layer on a wider pavement, has high construction efficiency and has certain compaction effect.

When paving, the following matters should be taken into consideration:

a. if sand or waste slag without cement is adopted, the material should be kept at a certain water content, generally controlled at 6-8%, for convenience of construction and compaction.

b. In order to avoid or reduce the segregation of cushion sand as much as possible during construction, the volume of each pile of material is not too large before the pile is spread by using the rake.

c. The construction length of the sand cushion layer is determined according to the length of paving the face bricks on the same day, and can be earlier than or synchronous with the construction of the face bricks. The thickness of the sand must meet the design requirement, the virtual paving coefficient (loose paving coefficient) is determined according to the test, and the natural sand can be 1.25-1.30.

d. After the sand cushion layer is paved, an iron roller can be adopted to roll the surface of the sand cushion layer back and forth properly (similar to cement concrete construction rolling) so as to ensure that the sand cushion layer has certain compactness and flatness.

e. The surface after construction should be even, level, forbid pedestrian, various mechanical equipment walking or park strictly.

Before the permeable facing bricks are constructed on a large scale, a construction surface is selected on a construction site and paved for at least 30m²And in the test section, large-scale construction operation can be performed after the summary.

(1) Construction of normal road section

The face brick should be laid following the construction of sand bed course, should pay attention to following each point when general highway section is laid:

a. determination of a reference line

There are curb stone

Because the two sides of the sidewalk are built with the kerbs according to a certain elevation requirement, only a transverse seam line is required to be pulled between the two kerbs as a reference line, but the problems of design gradient, compaction and settlement of face bricks and design height difference between the face bricks and the kerbs need to be considered and checked.

No kerbstone

The positioning of face brick laying can adopt a 'hanging line positioning method', a plurality of transverse sewing lines are selected as reference lines, the distance between adjacent transverse sewing lines is not more than 10m, and side lines and a plurality of unequal width lines of a sidewalk are hung on the vertical lines of the transverse sewing lines. The height of the hanging line needs to consider the design gradient and a certain throwing height value.

b. When in paving, a 'forward paving method' is adopted, construction personnel are strictly prohibited to stand on a sand cushion layer for operation and can stand on paved permeable face bricks, but the paved face bricks need to be covered with boards with certain areas within the operation range, so that firstly, the paved permeable face bricks are prevented from being polluted, and secondly, the influence on the surface flatness due to the concentrated load of the operation personnel is avoided.

c. The paving is generally conducted from one end of the kerbstone to the outside while advancing. The seams among the face bricks are preferably controlled to be about 3mm, and the face bricks can be properly adjusted by adopting wood or rubber hammers during construction, so that tools which are easy to damage the face bricks are forbidden.

d. In the process of paving, the flatness of the 3m ruler is required to be checked at any time, the checking comprises the three directions of horizontal direction, longitudinal direction and oblique angle, and the unevenness is found and is required to be adjusted in time.

e. The interval with two closed cross sections can be used as a construction section, and only one working surface can be arranged in one construction section to be paved according to the advancing direction of pedestrians.

f. If gaps of not more than 20mm are generated when the pavement is paved, the gaps of a plurality of pavement bricks can be properly adjusted to make up, and cement mortar is not suitable for direct filling.

(2) Construction of special parts

a. If ground facilities such as various municipal utility pipelines and the like, cover frames and the like are met, the concrete of C30 is timely poured on the parts which cannot be paved by the whole face bricks, and the pouring shape simultaneously considers the paving position of the whole face bricks.

b. In the construction of plane bending section, the method of adjusting the seam width is generally adopted, but the seam on the outer side of the bend is not less than 6mm, the seam on the inner side is not less than 2mm, and if the requirements are exceeded, the corner of the face brick is cut properly.

c. In the construction of vertical bending sections, generally, the stability of a vertical curve is required to be carried out as much as possible in the construction of a base layer and a cushion layer, the width of the seam between the upper surface and the lower surface of a face brick is also required to be controlled to be 2-6 mm, and if the requirements cannot be met, the face brick is also required to be cut properly.

d. The minimum size of all the paved road brick cutting blocks is not less than 20 mm.

e. When the construction is carried out on the edge part without the kerbstone, a concrete stop method or a face brick mortar bonding method is adopted to fix the face brick.

(3) Compacting and joint sand filling

After the face bricks are paved, proper rolling and joint sand filling treatment are carried out on the face bricks, so that the embedding and the squeezing between the contact surfaces of the face bricks are more compact.

a. A layer of fully-spread rain cloth or color stripe cloth is laid on the face brick to prevent the compacting machine from directly contacting the face brick to damage the edges and corners of the face brick.

b. The compacting machine is generally a hand-push type flat road roller.

c. The rolling direction is consistent with the pedestrian direction, the rolling sequence develops from the low side of the cross slope to the high side, the rolling speed is based on the normal pedestrian speed, and the rolling times are preferably 2 times.

d. And (4) performing sand filling and rolling on the surface joint, and repeating for a plurality of times until the joint is completely filled with sand.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A pavement considering water load coupling is characterized by comprising a graded broken stone cushion layer, a permeable cement stabilized broken stone base layer, a permeable mortar connecting layer and a permeable brick which are sequentially paved from the bottom to the top of a soil base; wherein, aggregate of the permeable cement stabilized macadam base layer adopts graded macadam, and the cement content is 5.5-7%; the grain size of stone chips of the permeable mortar connecting layer is 3-5 mm, and the ratio of cement to the stone chips is 1: 5-1: 6.

2. A pavement surface allowing for coupling of water loads according to claim 1, characterised in that the graded gravel pack has a thickness of 10 cm.

3. A pavement considering water load coupling as claimed in claim 1, wherein the permeable cement stabilized macadam base is controlled to have a thickness of 15cm to 30 cm.

4. A pavement surface allowing for coupling of water loads according to claim 1, wherein the thickness of the bonding layer is 3 cm.

5. A pavement surface considering water load coupling according to claim 1, wherein the cement is 425# cement, and the water cement ratio is 0.40-0.42.

6. A water load coupling considered pavement surface according to claim 1, wherein a layer of medium coarse sand or stone chips is laid between the graded broken stone cushion layer and the permeable cement stabilized broken stone base layer.

7. A construction method of a pavement considering water load coupling according to any one of claims 1 to 6, characterized by comprising the following steps:

8. The construction method according to claim 7, wherein in the step S3, the loose paving coefficient in the paving process is 1.18-1.2.

9. The construction method according to claim 7, wherein in step S3, a compaction machine with a small size not less than 20kN is used in the rolling process.

10. The construction method according to claim 7, wherein in step S3, the curing period is not less than 7 days and the wet state is maintained all the time.