CN114032729A - Non-self-weight collapsible loess-based permeable pavement and construction method thereof - Google Patents
Non-self-weight collapsible loess-based permeable pavement and construction method thereof Download PDFInfo
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- CN114032729A CN114032729A CN202111580999.8A CN202111580999A CN114032729A CN 114032729 A CN114032729 A CN 114032729A CN 202111580999 A CN202111580999 A CN 202111580999A CN 114032729 A CN114032729 A CN 114032729A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The utility model provides a non-dead weight collapsibility loess basic unit permeable pavement and construction method thereof, this permeable pavement is including setting up the infiltration layer on loess basic unit, graded pebble layer, the concrete basic unit that permeates water and the surface course of permeating water have set gradually from supreme on the infiltration layer, the infiltration layer with graded and be provided with the drainage network bed course between the pebble layer, the infiltration layer includes a plurality of infiltration net of splicing each other, be provided with on the infiltration net and be used for inserting extremely infiltration spare in the loess basic unit, be provided with a plurality of infiltration holes on the infiltration spare, the infiltration hole is used for permeating water the rivers on the net extremely in the loess basic unit. The seepage layer arranged in the invention enables water flow to change the flow direction and reduce the flow speed for many times under the action of the seepage grids and the seepage piece after reaching the seepage layer, thereby avoiding the instability of the loess base layer caused by scouring of the loess base layer and formation of flow channels in the loess base layer when the water flow enters the loess base layer.
Description
Technical Field
The invention relates to the technical field of sponge urban road engineering, in particular to a non-self-weight collapsible loess-based permeable pavement and a construction method thereof.
Background
Along with the suggestion of sponge city concept, more and more people begin to attach importance to ecological permeable pavement, and ecological permeable pavement also begins to use in urban road by a large scale, and permeable pavement's main function is through reducing peak flow and runoff, prolongs the peak and now the time, through handling the rainwater in the source, reduces the influence of city development to natural hydrology circulation system, alleviates drainage system load and urban waterlogging risk.
Current permeable pavement structures can be broadly divided into two categories, one being a full permeable pavement structure and the other being a semi-permeable pavement structure. However, no matter what kind of permeable pavement structure, it all has the potential safety hazard to collapsible loess area. This is because the collapsible loess is unsaturated, less dense soil having a certain structural strength under natural humidity, and when it is wetted with water, the strength is significantly reduced, and the collapsible deformation occurs, so that the structure of the soil is rapidly destroyed and the strength is significantly reduced after the natural loess is wetted with water under a certain pressure. The collapsible loess can be further subdivided into self-weight collapsible loess and non-self-weight collapsible loess, wherein the non-self-weight collapsible loess is required to be collapsed under the action of certain additional pressure after being soaked in water.
The traditional method for treating the non-self-weight collapsible loess permeable pavement mainly comprises a heavy hammer tamping method, a compaction pile method and a cushion layer method. The bedding method is a traditional method for treating a collapsible loess foundation in a shallow layer, and is an improved permeable pavement structure as disclosed in patent CN208965351U, in which a lightweight soil bedding is provided on a loess layer to reduce the overburden pressure of the lower loess layer, and cotton stalk fibers are mixed in the bedding to increase the strength and permeability of the lightweight soil layer. However, the light weight soil cushion layer still cannot get rid of the defect of the cushion layer method, the contact surface of the cushion layer and the loess base layer is still a plane, the added cotton stalk fiber has weak effect of relieving the overlying pressure, so the light weight soil cushion layer is only suitable for shallow layer treatment and is difficult to meet the engineering requirement, the combination capacity of the cushion layer and the loess base layer is poor, relative horizontal displacement is easy to generate to cause the collapse of the whole structure, and in addition, the permeated water flow easily flows in the loess quickly to cause the instability of the loess base layer subgrade.
Disclosure of Invention
The invention aims to provide a non-self-weight collapsible loess base layer permeable pavement, which aims to solve the problems that in the permeable pavement structure of the non-self-weight collapsible loess base layer in the prior art, the overlaying pressure of the loess base layer is high, the structural stability of the permeable pavement is poor, water flow permeating the loess base layer is easy to rapidly flow in the loess base layer to form a passage, so that the non-self-weight collapsible loess base layer permeable pavement is low in strength, the loess base layer is easy to collapse, the service life of the permeable pavement is short and the like, and realize the permeable pavement structure suitable for the non-self-weight collapsible loess base layer.
The invention is realized by the following technical scheme:
the utility model provides a non-dead weight collapsibility loess basic unit permeable pavement, is including setting up the infiltration layer on loess basic unit, the infiltration layer is last from supreme graded pebble layer, the concrete basic unit that permeates water and the surface course that permeates water of having set gradually on the infiltration layer, the infiltration layer with be provided with the drainage network bed course between the graded pebble layer, the infiltration layer includes the infiltration net of a plurality of mutual concatenations, be provided with on the infiltration net and be used for inserting extremely infiltration spare in the loess basic unit, be provided with a plurality of infiltration holes on the infiltration spare, the infiltration hole is used for permeating water the rivers on the net extremely in the loess basic unit.
In the technical scheme, the permeable pavement is sequentially provided with a water seepage layer, a graded pebble layer, a permeable concrete base layer and a permeable surface layer from bottom to top. The graded pebble layer is a mixture composed of aggregates with different size fractions, and preferably consists of cobbles with different sizes. The pervious concrete base layer can adopt the same pervious concrete, such as C20 pervious concrete, and can also adopt a mixture of various pervious concretes, such as C20 pervious concrete and C25 pervious concrete. The permeable surface layer can be made of concrete permeable bricks or permeable concrete.
In the technical scheme, a drainage net cushion layer is arranged between the water seepage layer and the graded pebble layer. The drainage mesh bed layer may be a structure formed by interlacing metal wires or plastic wires and having a certain thickness, for example, a multi-layer steel mesh. The effect that possesses certain thickness's drainage network bed course not only can play the support promotes road surface structure's bulk strength, and simultaneously, the mesh of intercommunication each other on the drainage network bed course can play the effect of permeating water again, and the moisture that sees through on the grading cobble layer can flow in the mesh of drainage network bed course. In some embodiments, the permeable pavement further comprises a rainwater well, wherein a drainage hole is formed in the rainwater well, the drainage hole is communicated with the drainage mesh pad, and the drainage mesh pad is communicated with the rainwater well, so that water penetrating into the drainage mesh pad can enter the rainwater well through the drainage hole to be collected.
In this technical scheme, the infiltration layer includes a plurality of infiltration grids of splicing each other, be provided with the infiltration piece on the infiltration grid. The structure of infiltration net is similar to the ceramic tile, and when the construction, the infiltration net of piece is assembled on the loess of ramming, and the joint line between the adjacent infiltration net pastes the shutoff through hot melt adhesive or other special glues, and when the rainwater well came too late to drain away the rainwater on the drainage network bed course, the rainwater of drainage network bed course will enter into the loess basic unit through the infiltration hole of the infiltration piece of infiltration net.
The arrangement of the water seepage grids and the water seepage pieces effectively improves the contact area between the water seepage layer and the loess base layer, can better reduce the overlying pressure compared with the prior art, and can remarkably improve the bearing capacity, improve the deep treatment capacity and meet the diversified requirements of the engineering by combining the design of the drainage network cushion; meanwhile, the water seepage piece inserted into the loess base layer can effectively prevent the transverse movement between the water seepage layer and the loess base layer, and the whole permeable pavement structure is more stable; moreover, rivers will change flow direction, velocity of flow many times under the effect of infiltration net and infiltration piece after arriving on the infiltration layer and reduce, avoid rivers to erode the loess basic unit, form the runner and lead to loess basic unit unstability in loess basic unit when getting into the loess basic unit.
As a preferred embodiment of the present invention, the water permeable grid is provided with through holes, the through holes are communicated with the inside of the water permeable member, the inside of the water permeable member is provided with a water retaining agent, and the amount of the water retaining agent is configured such that the water retaining agent can cover at least part of the water permeable holes on the water permeable member after water absorption and expansion. In the technical scheme, the water seepage piece is of a hollow structure, and the water retaining agent arranged in the water seepage piece can adopt one or more existing water retaining agents, such as acrylamide-acrylate copolymerization cross-linked substances.
The water-retaining agent is when not absorbing water or the volume of absorbing water is lower, and is small, and whole or most infiltration hole is opened this moment, and rivers on the infiltration net can enter into the loess basic unit through the infiltration hole. After a period of time, the water-retaining agent absorbs water and expands until all or most of the water seepage holes are covered, the covered water seepage holes are closed, water flow on the water seepage grid enters the water seepage piece through the through holes and can only slowly move through the expanded and soaked water-retaining agent, and finally permeates into the loess base layer around the water seepage piece through the water seepage holes, so that the scouring of rainwater on the loess base layer is further weakened, the expanded water-retaining agent is a hydrogel crystal, the hardness of the water-retaining agent can improve the strength of the water seepage piece to a certain extent, the loess base layer is reinforced, the movement of the loess base layer is reduced, and the stability of the permeable pavement is further improved; in addition, the distances among all the water seepage pieces of the water seepage layer are basically consistent, so that the uniform wettability of all parts in the loess base layer can be kept in the water absorption or water release process of the water retaining agent, and collapse caused by local transitional wetting is avoided; except absorbing the rainwater, the water retaining agent can also reduce the moisture in the loess basic unit, and then reduces the evaporation capacity of water in the loess basic unit, when temperature is lower, reduces icy road, improves driving safety.
As a preferable structure of the water seepage piece, a baffle is arranged in the through hole, a water passing hole is formed in the baffle, an adjusting plate is arranged below the water passing hole and connected to the drainage net cushion layer through a spring, the adjusting plate comprises a water passing state and a closing state, a gap is formed between the adjusting plate and the baffle in the water passing state, the water passing hole is opened, and the adjusting plate closes the water passing hole under the pushing of the water-retaining agent after water absorption and expansion in the closing state.
Among this technical scheme, the regulating plate is used for adjusting the inside discharge of entering infiltration piece, avoids the expanded water retaining agent to spill over the through-hole simultaneously. Specifically, the regulating plate includes a water passing state and a closed state. When the water-retaining agent did not absorb water and expand or did not expand to preset volume, the regulating plate hung in the infiltration piece through the spring, and the clearance between regulating plate and the baffle makes rivers can continue to flow into contact the water-retaining agent in the infiltration piece, and the regulating plate is in water state this moment. When the water retaining agent lasted to absorb water and expanded to predetermineeing the volume, the water retaining agent of inflation this moment drove the vertical rebound of regulating plate, and the water hole is closed to final regulating plate, reduces the discharge that can enter into in the infiltration piece by a wide margin, and the regulating plate is in the closed condition this moment. After the water-retaining agent releases water for a period of time and the volume is reduced, the adjusting plate without support is opened again, and water flow can enter the water-permeable piece through the water hole again. After the water-retaining agent expands, the water flow continuously entering the water seepage piece still permeates into the loess base layer around the water seepage piece through the covered water seepage holes, and the humidity degree of the loess around the water seepage piece is gradually improved. After having adopted above-mentioned mechanism, can adjust the water yield that enters into in the piece that seeps water adaptively, gush into too much rivers in avoiding the piece that seeps water, reduce the total water yield in the loess basic unit around the piece that seeps water, further improve the stability of loess basic unit, and simultaneously, the regulating plate can also prevent that the water retaining agent from expanding to the through-hole outside, and then realize the setting that the volume was predetermine in the water retaining agent inflation, adjust the water yield that can let in each piece that seeps water better, ensure that the wet degree of each department in the loess basic unit is balanced.
Further, the water passing state comprises an initial water passing state and a forced water passing state, the spring is in a natural state or a stretching state under the initial water passing state, the gap between the adjusting plate and the baffle is a first gap, the spring is in the stretching state under the forced water passing state, the adjusting plate is in the stretching state, the gap between the adjusting plate and the baffle is a second gap, and the width of the second gap is greater than that of the first gap.
In the technical scheme, the water passing state comprises an initial water passing state with lower water passing amount and a strong water passing state with larger water passing amount. Under the normal drainage condition, the regulating plate is in under the initial water state of crossing, and the spring is in natural state or the less tensile state of tensile range this moment, and water flows through first clearance and passes through, because discharge is not big, can not cause the downstream of regulating plate. When displacement steeply increases, the discharge that gushes into on the infiltration net through the drainage network bed course increases fast, and excessive rivers can promote the vertical downstream of regulating plate this moment, and the spring is in the tensile position of limit or is close the tensile position of limit, and the clearance between regulating plate and the baffle enlarges to the second clearance, allows more rivers to enter into and seep water the piece in with the contact of water retaining agent. The two-stage setting of crossing the water state is favorable to the regulating plate to adjust the water yield that enters the infiltration piece according to the size self-adaptation of displacement, further improves the regulating power, maintains the water yield in the infiltration piece, the water yield in the loess basic unit around the infiltration piece is balanced.
Furthermore, the lower surface of the adjusting plate is a conical surface. Among this technical scheme, the lower surface of regulating plate is the conical surface, the conical surface can be the convex surface also can be the concave surface, and the effect of conical surface lies in concentrating on the central point with the effort of the water retaining agent of inflation to the adjusting plate to make the regulating plate difficult in the in-process of vertical removal because of the irregular inflation of water retaining agent produce the upset, lead to adjusting the inefficacy, improve the stability and the reliability of mechanism.
Further, a step is arranged on the outer edge of the adjusting plate, and in the closed state, the step abuts against the inner edge of the baffle. The external diameter of the step on the regulating plate matches with the internal diameter of baffle to when making closed condition, regulating plate and baffle can stabilize the laminating, further reduce the throughput of rivers, simultaneously, the step possesses the function of location, and the problem that the water hole closed not closely that prevents that the irregular inflation of water retaining agent from leading to.
Further, the water seepage part is of a cone structure, and the outer diameter of the cone structure is gradually reduced from top to bottom. The pyramidal structure can be better inserted into the tamped loess basic layer during construction, and is more compact in combination with the loess basic layer, and the pyramidal structure is also favorable for the placement and the expansion of the water-retaining agent.
The invention also provides a preparation process of any one of the non-self-weight collapsible loess-based layer permeable pavements, which comprises the following steps:
paving water seepage grids on a tamped loess base layer, inserting water seepage pieces of the water seepage grids into the loess base layer, adhering and plugging connecting joints between adjacent water seepage grids by using viscose glue, and arranging a water retention agent in the water seepage pieces to form a water seepage layer; laying a plurality of layers of three-dimensional geonet pads on the water seepage layer to form a drainage net pad layer, wherein the drainage net pad layer is communicated with a rainwater well, and sequentially laying a graded cobble layer, a water-permeable concrete base layer and a water-permeable surface layer on the drainage net pad layer to the ground elevation.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the seepage layer arranged in the invention enables water flow to change the flow direction and reduce the flow speed for many times under the action of the seepage grids and the seepage piece after reaching the seepage layer, thereby avoiding the instability of the loess base layer caused by scouring of the loess base layer and formation of a flow channel in the loess base layer when the water flow enters the loess base layer;
2. the water seepage layer effectively improves the contact area between the water seepage layer and the loess base layer, can better reduce the overlying pressure compared with the prior art, and can obviously improve the bearing capacity, improve the deep treatment capacity and meet the diversified requirements of the engineering by combining the design of the drainage network cushion layer; meanwhile, the water seepage piece inserted into the loess base layer can effectively prevent the transverse movement between the water seepage layer and the loess base layer, and the whole permeable pavement structure is more stable;
3. according to the invention, the water-retaining agent is added into the water-permeable piece, so that water flow on the water-permeable grid can only slowly move through the expanded and soaked water-retaining agent after entering the water-permeable piece through the through holes, and finally permeates into the loess base layer around the water-permeable piece through the water-permeable holes, so that the scouring of rainwater on the loess base layer is further weakened, and the expanded water-retaining agent is a hydrogel crystal, the hardness of the water-retaining agent can improve the strength of the water-permeable piece to a certain extent, the loess base layer is reinforced, the movement of the loess base layer is reduced, and the stability of the permeable pavement is further improved; in addition, the distances among all the water seepage pieces of the water seepage layer are basically consistent, so that the uniform wettability of all parts in the loess base layer can be kept in the water absorption or water release process of the water retaining agent, and collapse caused by local transitional wetting is avoided; except absorbing the rainwater, the water-retaining agent can also reduce the moisture in the loess basic unit, and then reduces the evaporation capacity of water in the loess basic unit, when temperature is lower, reduces icy road, improves driving safety
4. According to the invention, through the self-adaptive adjusting plate mechanism, the amount of water entering the water seepage piece can be adjusted in a self-adaptive manner, excessive water flow is prevented from flowing into the water seepage piece, the total amount of water in a loess base layer around the water seepage piece is reduced, the stability of the loess base layer is further improved, meanwhile, the adjusting plate can prevent the water-retaining agent from expanding to the outer side of the through hole, the setting of the preset expansion volume of the water-retaining agent is further realized, the amount of water which can be introduced into each water seepage piece is adjusted better, and the balance of the wetting degree of each position in the loess base layer is ensured;
5. according to the invention, the two-stage arrangement of the water passing state of the adjusting plate is beneficial to the adjusting plate to adaptively adjust the water amount entering the water seepage piece according to the water displacement, so that the adjusting capability is further improved, and the balance between the water amount in the water seepage piece and the water amount in the loess base layer around the water seepage piece is maintained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of a permeable pavement according to an embodiment of the present invention;
FIG. 2 is a schematic view of the construction of a drainage mesh mat and a water-permeable layer in an embodiment of the present invention;
FIG. 3 is a schematic view showing the configuration of a water-retaining agent provided in a water-permeable member of one configuration according to an embodiment of the present invention when it is not expanded;
FIG. 4 is a schematic view showing the structure of a water-retaining agent provided in a water-permeable member of one structure according to an embodiment of the present invention when it is swollen;
FIG. 5 is a schematic structural view showing an adjustment plate in a water-passing state or an initial water-passing state when a water-retaining agent provided in a water-permeable member of another structure according to an embodiment of the present invention is not expanded;
FIG. 6 is a schematic view showing a closed state of an adjusting plate when a water-retaining agent provided in a water-permeable member of another structure according to an embodiment of the present invention is swollen;
fig. 7 is a schematic structural view of a permeable pavement construction method in an embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
1-loess base layer, 2-water seepage layer, 21-water seepage grid, 211-through hole, 22-water seepage piece, 221-water seepage hole, 23-water retention agent, 231-water swelling water retention agent, 24-baffle, 25-spring, 26-adjusting plate, 27-water seepage hole, 28-conical surface, step-29, 3-drainage net cushion layer, 4-graded pebble layer, 5-water permeable concrete base layer, 6-water permeable surface layer, 7-rainwater well and 8-drainage hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be taken as limiting the scope of the invention.
Example 1:
as shown in fig. 1 and fig. 2 a non-dead weight collapsible loess basic unit permeable pavement, including setting up the infiltration layer 2 on loess basic unit 1, infiltration layer 2 is last to have set gradually graded pebble layer 4, concrete basic unit 5 and the surface course 6 that permeates water from supreme down, infiltration layer 2 with graded pebble layer 4 between be provided with drainage network bed course 3, infiltration layer 2 includes a plurality of infiltration net 21 of splicing each other, be provided with on the infiltration net 21 and be used for inserting extremely infiltration spare 22 in loess basic unit 1, be provided with a plurality of infiltration holes 221 on the infiltration spare 22, infiltration hole 221 is used for permeating water on the net 21 extremely with permeating water in the loess basic unit 1.
In some embodiments, the graded pebble layer is composed of cobbles of different sizes. The pervious concrete base layer can adopt the same pervious concrete, such as C20 pervious concrete, and can also adopt a mixture of various pervious concretes, such as C20 pervious concrete and C25 pervious concrete. The permeable surface layer can be made of concrete permeable bricks or permeable concrete.
In one or more embodiments, the drainage mesh bed layer 3 comprises at least two layers of three-dimensional geonet mats, and the two adjacent layers of three-dimensional geonet mats are connected through bonding. In one embodiment, the drainage mesh cushion layer is formed by stacking and connecting a plurality of layers of steel wire meshes.
In some embodiments, as shown in fig. 1, the waterproof mattress further comprises a rainwater well 7, wherein a drainage hole 8 is formed in the rainwater well 7, and the drainage hole 8 is communicated with the drainage mat 3. Preferably, the drainage mesh mat is inclined toward the rainwater well so as to facilitate water flow into the rainwater well.
In one or more embodiments, the water permeating member may be a hollow structure, and allows water entering the inside to permeate into the loess base layer through the water permeating holes. In one or more embodiments, the water seepage grid and the water seepage piece can be of an integrated structure, so that the water seepage grid and the water seepage piece are convenient to produce and mold, and can also be two mutually independent parts, so that the water seepage piece and the water seepage grid can be conveniently replaced and maintained by dismounting and mounting when in use. In one or more embodiments, only one water-permeable member may be disposed on the water-permeable grid, or a plurality of water-permeable members may be disposed on the water-permeable grid.
In one or more embodiments, the structure of the water permeable member on the water permeable grid may be a cylinder, a pyramid, a cone, a cuboid, a cube, a hemisphere, or the like. Preferably, the water-permeable member 22 is a cone structure, and the outer diameter of the cone structure is gradually reduced from top to bottom. The pyramidal structure can be better inserted into the tamped loess basic layer during construction, and is more compact in combination with the loess basic layer, and the pyramidal structure is also favorable for the placement and the expansion of the water-retaining agent.
In the embodiment, the arrangement of the water seepage grids and the water seepage pieces effectively improves the contact area between the water seepage layer and the loess base layer, can better reduce the overlying pressure compared with the prior art, and can remarkably improve the bearing capacity, improve the deep treatment capacity and meet the diversified requirements of the engineering by combining the design of the drainage network cushion; meanwhile, the water seepage piece inserted into the loess base layer can effectively prevent the transverse movement between the water seepage layer and the loess base layer, and the whole permeable pavement structure is more stable; moreover, rivers will change flow direction, velocity of flow many times under the effect of infiltration net and infiltration piece after arriving on the infiltration layer and reduce, avoid rivers to erode the loess basic unit, form the runner and lead to loess basic unit unstability in loess basic unit when getting into the loess basic unit.
Example 2:
on the basis of embodiment 1, as shown in fig. 2 to 4, through holes 211 are provided on the water permeable grid 21, the through holes 211 are communicated with the inside of the water permeable member 22, a water retaining agent is provided inside the water permeable member 22, and the amount of the water retaining agent is configured to cover at least part of the water permeable holes 221 on the water permeable member 22 after the water retaining agent absorbs water and swells.
In this embodiment, the water-retaining agent is when not absorbing water or the water absorption is lower, as shown in fig. 3, the water-retaining agent is small, and whole or most infiltration hole is opened this moment, and rivers on the infiltration net can enter into the loess basic unit through the infiltration hole. After a period of time, as shown in fig. 4, the water-retaining agent absorbs water and expands until all or most of the water seepage holes are covered, the covered water seepage holes are closed, water on the water seepage grid enters the water seepage piece through the through holes, and then only can slowly move through the expanded and soaked water-retaining agent, and finally permeates into the loess base layer around the water seepage piece through the water seepage holes, so that the scouring of rainwater on the loess base layer is further weakened, and the expanded water-retaining agent is a hydrogel crystal, the hardness of the water-retaining agent can improve the strength of the water seepage piece to a certain extent, reinforce the loess base layer and reduce the movement of the loess base layer, so that the stability of the permeable pavement is improved; in addition, the distances among all the water seepage pieces of the water seepage layer are basically consistent, so that the uniform wettability of all parts in the loess base layer can be kept in the water absorption or water release process of the water retaining agent, and collapse caused by local transitional wetting is avoided; except absorbing the rainwater, the water retaining agent can also reduce the moisture in the loess basic unit, and then reduces the evaporation capacity of water in the loess basic unit, when temperature is lower, reduces icy road, improves driving safety.
Example 3:
on the basis of the above embodiment, as shown in fig. 5 and 6, a baffle plate 24 is arranged in the through hole 211, a water passing hole 27 is formed in the baffle plate 24, an adjusting plate 26 is arranged below the water passing hole 27, the adjusting plate 26 is connected to the drainage net cushion 3 through a spring 25, the adjusting plate 26 includes a water passing state and a closed state, in the water passing state, a gap exists between the adjusting plate 26 and the baffle plate 24, the water passing hole 27 is opened, and in the closed state, the adjusting plate 26 is closed under the pushing of the water retention agent 23 after water absorption expansion.
When the water retention agent is not swollen by water or is not swollen to a predetermined volume, as shown in fig. 5, the regulating plate is suspended in the water permeable member by a spring, and the gap between the regulating plate and the baffle plate enables water to continuously flow into the water permeable member to contact the water retention agent, at which time the regulating plate is in a water passing state. When the water retaining agent continuously absorbs water and expands to a preset volume, as shown in fig. 6, the expanded water retaining agent drives the adjusting plate to vertically move upwards, the water hole is closed by the final adjusting plate, the water flow rate in the water seepage piece is greatly reduced, and the adjusting plate is in a closed state. After the water-retaining agent releases water for a period of time and the volume is reduced, the adjusting plate without support is opened again, and water flow can enter the water-permeable piece through the water hole again.
In one or more embodiments, the predetermined volume can be adjusted by the type and amount of water retaining agent.
In some embodiments, the water passing state includes an initial water passing state in which the spring 25 is in a natural state or a stretched state, a gap between the adjusting plate 26 and the baffle plate 24 is a first gap, and a strong water passing state in which the spring 25 is in a stretched state, the adjusting plate 26 is in a stretched state, a gap between the adjusting plate 26 and the baffle plate 24 is a second gap, and a width of the second gap is greater than a width of the first gap. The two-stage setting of crossing the water state is favorable to the regulating plate to adjust the water yield that enters the infiltration piece according to the size self-adaptation of displacement, further improves the regulating power, maintains the water yield in the infiltration piece, the water yield in the loess basic unit around the infiltration piece is balanced.
In some embodiments, the lower surface of the adjustment plate 26 is a tapered surface 28.
In some embodiments, the adjusting plate 26 has a step 29 disposed on an outer edge thereof, and in the closed state, as shown in fig. 6, the step 29 abuts against an inner edge of the baffle 24.
Example 4:
as shown in fig. 7, the preparation process of the non-self-weight collapsible loess-based layer permeable pavement comprises the following steps:
paving water seepage grids on a tamped loess base layer, inserting water seepage pieces of the water seepage grids into the loess base layer, adhering and plugging connecting joints between adjacent water seepage grids by using viscose glue, and arranging a water retention agent in the water seepage pieces to form a water seepage layer;
laying a plurality of layers of three-dimensional geonet pads on the water seepage layer to form a drainage net pad layer, wherein the drainage net pad layer is communicated with a rainwater well, and sequentially laying a graded cobble layer, a water-permeable concrete base layer and a water-permeable surface layer on the drainage net pad layer to the ground elevation.
In this embodiment, can be at first according to the ground elevation to the work place of confirming downwards in the non-dead weight collapsible loess layer work place adopts pre-soaking treatment method to tamp non-dead weight collapsible loess extremely ground elevation, the non-dead weight collapsible loess basic unit of tamping reserves the slope that ground coefficient of putting is 4 ~ 8% to the position of rainwater well, and the non-dead weight collapsible loess basic unit of adopting pre-soaking treatment method to tamp is convenient for lay the infiltration net. Then, water seepage grids are laid on the tamped loess base layer, and hot melt adhesives or other special adhesives are adopted to adhere the connecting seams of the water seepage grids during construction. Then the permeable member is filled with a water retaining agent to form a permeable layer. And finally, after the drainage net cushion layer is laid, sequentially laying the graded pebble layer, the permeable concrete base layer and the permeable surface layer to the ground elevation.
As used herein, "first," "second," etc. merely distinguish the corresponding components for clarity of description and are not intended to limit any order or to emphasize importance, etc. Further, the term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a non-dead weight collapsible loess basic unit permeable pavement, is including setting up infiltration layer (2) on loess basic unit (1), infiltration layer (2) are gone up from bottom to supreme graded pebble layer (4) of joining in marriage, concrete basic unit (5) and the surface course (6) of permeating water that have set gradually, a serial communication port, infiltration layer (2) with be provided with drainage network bed course (3) between graded pebble layer (4), infiltration layer (2) are including a plurality of infiltration net (21) of splicing each other, be provided with on infiltration net (21) and be used for inserting extremely infiltration spare (22) in loess basic unit (1), be provided with a plurality of infiltration holes (221) on infiltration spare (22), infiltration hole (221) are used for the rivers infiltration extremely on infiltration net (21) in loess basic unit (1).
2. The non-self-weight collapsible loess-based layer permeable pavement according to claim 1, wherein the water-permeable mesh (21) is provided with through holes (211), the through holes (211) communicate with the inside of the water-permeable member (22), the inside of the water-permeable member (22) is provided with a water-retaining agent, the amount of the water-retaining agent is configured such that the water-retaining agent can cover at least part of the water-permeable holes (221) on the water-permeable member (22) after water absorption and expansion.
3. The non-self-weight collapsible loess-based water-permeable pavement according to claim 2, wherein a baffle (24) is provided in the through hole (211), a water passing hole (27) is opened on the baffle (24), an adjusting plate (26) is provided below the water passing hole (27), the adjusting plate (26) is connected to the drainage net cushion layer (3) through a spring (25), the adjusting plate (26) comprises a water passing state and a closed state, under the water passing state, a gap exists between the adjusting plate (26) and the baffle (24), the water passing hole (27) is opened, under the closed state, the adjusting plate (26) is closed under the pushing of the water-retaining agent (23) after water absorption expansion, and the water passing hole (27) is closed.
4. The non-self-weight collapsible loess-based layer permeable pavement according to claim 3, wherein the water passing state comprises an initial water passing state and a forced water passing state, the spring (25) is in a natural state or a stretched state in the initial water passing state, the gap between the regulating plate (26) and the baffle (24) is a first gap, the spring (25) is in a stretched state in the forced water passing state, the regulating plate (26) is in a stretched state, the gap between the regulating plate (26) and the baffle (24) is a second gap, and the width of the second gap is greater than the width of the first gap.
5. The non-self-weight collapsible loess-based layer permeable pavement as claimed in claim 3, wherein the lower surface of the regulating plate (26) is a tapered surface (28).
6. The non-self-weight collapsible loess-based layer permeable pavement as claimed in claim 3, wherein a step (29) is provided on an outer edge of the adjusting plate (26), and in the closed state, the step (29) abuts against an inner edge of the barrier (24).
7. The non-self-weight collapsible loess-based layer permeable pavement according to any one of claims 1 to 6, wherein the water-permeable member (22) has a cone structure, and the outer diameter of the cone structure is gradually reduced from top to bottom.
8. The non-self-weight collapsible loess-based layer permeable pavement according to any one of claims 1 to 6, wherein the drainage mesh bed (3) comprises at least two three-dimensional geonet mats, and the two adjacent three-dimensional geonet mats are connected by bonding.
9. The non-self-weight collapsible loess-based layer permeable pavement according to claim 8, further comprising a catch basin (7), wherein the catch basin (7) is provided with a drainage hole (8), and the drainage hole (8) is communicated with the drainage mesh mat (3).
10. The preparation process of the non-self-weight collapsible loess-based layer permeable pavement according to any one of claims 1 to 9, wherein the preparation process comprises the following steps:
paving water seepage grids (21) on a tamped loess base layer (1), inserting water seepage pieces (22) of the water seepage grids (21) into the loess base layer (1), adopting viscose glue for bonding and plugging connecting seams between adjacent water seepage grids (21), and arranging a water retention agent in the water seepage pieces (22) to form a water seepage layer (2);
lay the three-dimensional geotechnological net of multilayer pad and constitute drainage network bed course (3) on water seepage layer (2), drainage network bed course (3) and rainwater well intercommunication are laid graded cobble layer (4), concrete basic unit (5) and surface course (6) to the ground elevation of permeating water on drainage network bed course (3) in proper order.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114892463A (en) * | 2022-06-06 | 2022-08-12 | 四川公路桥梁建设集团有限公司 | Permeable pavement structure for high-groundwater-level area and laying method thereof |
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| US20200354900A1 (en) * | 2019-05-07 | 2020-11-12 | Beijing University Of Civil Engineering And Architecture | Method and device for a permeable pavement of dirt interception |
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| CN106351103A (en) * | 2016-11-09 | 2017-01-25 | 苏谦 | Permeable pavement structure with high strength and high permeability and paving method thereof |
| CN207727546U (en) * | 2017-12-23 | 2018-08-14 | 广州华磊建筑基础工程有限公司 | A kind of displacement hull and cured layer combined foundation structure |
| CN208965351U (en) * | 2018-09-29 | 2019-06-11 | 机械工业勘察设计研究院有限公司 | A kind of Collapsible Loess District permeable pavement structure |
| US20200354900A1 (en) * | 2019-05-07 | 2020-11-12 | Beijing University Of Civil Engineering And Architecture | Method and device for a permeable pavement of dirt interception |
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| CN114892463A (en) * | 2022-06-06 | 2022-08-12 | 四川公路桥梁建设集团有限公司 | Permeable pavement structure for high-groundwater-level area and laying method thereof |
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