Collapsible loess area sponge city sidewalk structure

Abstract

The utility model provides a collapsible loess area sponge city sidewalk structure which comprises a sidewalk permeable structure, a waterproof geomembrane is arranged in the sidewalk permeable structure, a first graded broken stone layer is arranged above the waterproof geomembrane, a first perforated pipe is arranged in the first graded broken stone layer, and a second perforated pipe is arranged in the second graded broken stone layer. The first perforated pipe is connected with a first drainage pipe extending outwards; a planting groove is formed in one side of the sidewalk permeable structure; through the combination of the sidewalk water permeable structure and the planting grooves, effective collection, purification and discharge of rainwater are realized, and meanwhile, the problem of settlement of collapsible loess caused by rainwater infiltration is avoided. The sidewalk adopts a multi-layer permeable material design, so that the pavement is dry and comfortable in rainy days, and the slipping risk of pedestrians is reduced. The multi-layer structure in the planting groove can store and purify rainwater, delay runoff and reduce urban inland inundation. In addition, due to the design of the reinforced concrete structure and the steel wire rings of the planting grooves, the overturning resistance of the border trees is enhanced, and the overall stability of the sidewalk is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of city construction, and specifically relates to a sponge city sidewalk structure in collapsible loess area. BACKGROUND

[0002] With the acceleration of urbanization, the traditional urban drainage system faces many challenges, such as urban waterlogging caused by rapid discharge of rainwater runoff, water resource waste, and water pollution. The concept of sponge city construction emerged as the times required, emphasizing the use of technical measures such as "seepage, detention, storage, purification, use, and discharge" to achieve source control and resource utilization of rainwater. However, in collapsible loess areas, sponge city construction faces special technical challenges.

[0003] Collapsible loess is a special geological condition, and its soil structure is prone to settlement after being soaked, and the bearing capacity quickly decays. When rainwater infiltrates into the collapsible loess layer, it may cause uneven settlement of building foundations and even structural damage, thereby endangering the safety of buildings and infrastructure. Currently, the national standard has not yet provided clear technical guidelines for sponge city construction in collapsible loess areas. In actual engineering practice, most relevant cities adopt the "strictly guarded type (comprehensive impermeable)" approach, or list collapsible loess areas in the "exemption list" and do not carry out sponge city construction. Although these approaches can to some extent avoid safety problems caused by rainwater infiltration, they lack scientific evidence and fail to fully utilize the functions of sponge cities, such as rainwater resource utilization and runoff pollution control.

[0004] In addition, traditional sidewalk design usually uses impermeable materials, and rainwater cannot penetrate, which can easily form puddles in rainy days, causing pedestrians to slip and fall and other safety hazards. Even if some sidewalks use permeable materials, they cannot effectively solve the problem of collapsible loess settlement caused by rainwater infiltration, and lack systematic measures for rainwater collection, purification, and utilization. SUMMARY

[0005] The utility model provides a kind of collapsible loess area sponge city sidewalk structure, the combination of sidewalk permeable structure and planting groove is realized Effective collection, purification and discharge of rainwater, while avoiding the problem of collapsible loess settlement caused by rainwater infiltration. The sidewalk is designed with multiple layers of permeable material to ensure dry pavement on rainy days and reduce the risk of pedestrian slipping. The multi-layer structure in the planting groove can store and purify rainwater, delay runoff and reduce urban waterlogging. In addition, the reinforced concrete structure and steel wire ring design of the planting groove enhance the anti-overturning ability of the sidewalk trees and improve the overall stability of the sidewalk.

[0006] The utility model discloses a technical scheme is: a kind of sponge city sidewalk structure in collapsible loess area, including sidewalk water-permeable structure, waterproof geomembrane is provided in sidewalk water-permeable structure inside, waterproof geomembrane upper is equipped with graded broken stone layer one, the inside of graded broken stone layer one has first perforated pipe, first perforated pipe is connected with the first drainage pipe extending outward;

[0007] One side of sidewalk water-permeable structure is equipped with planting groove, and graded broken stone layer two is equipped in the bottom of planting groove, the tail end of first drainage pipe extends to graded broken stone layer two, second perforated pipe is equipped in the inside of graded broken stone layer two, and second drainage pipe is connected on second perforated pipe, and the tail end of second drainage pipe extends to external rainwater well, and inverse check valve is installed at the tail end of second drainage pipe.

[0008] The sidewalk water-permeable structure further includes a water-permeable concrete layer, a cement mortar layer and a water-permeable brick layer arranged in sequence on the graded broken stone layer one; and further includes a rammed clay sealing layer located below the waterproof geomembrane.

[0009] In the sidewalk water-permeable structure, the thickness of the water-permeable brick layer is 6 cm, the thickness of the cement mortar layer is 3 cm, the thickness of the water-permeable concrete layer is 15 cm, the thickness of the graded broken stone layer one is 10 cm, and the thickness of the rammed clay sealing layer is 30 cm.

[0010] The planting groove is a reinforced concrete prefabricated structure, and the cross-sectional shape is a U-shaped structure.

[0011] The thick sand layer, the planting soil layer and the sunken vegetation pebble water storage layer are arranged in sequence in the planting groove and above the graded broken stone layer two.

[0012] The thickness of the sunken vegetation pebble water storage layer is 10-15 cm, the thickness of the planting soil layer is 150 cm, the thickness of the thick sand layer is 10 cm, and the thickness of the graded broken stone layer two is 20 cm.

[0013] The outer bottom of the planting groove is provided with a concrete cushion layer, and the thickness of the concrete cushion layer is 10 cm.

[0014] The sidewalk tree is planted on the planting soil layer in the planting groove, the tree trunk of the sidewalk tree is provided with a cushion, a plurality of steel wire rings are installed at the sidewall position of the planting groove, and the steel wire rings and the cushion are connected by a steel wire rope.

[0015] The utility model has the advantages that:

[0016] 1. The utility model discloses a sidewalk water-permeable structure and planting groove are combined, realize the effective collection, purification and discharge of rainwater. The multilayer material design (including water-permeable brick, cement mortar layer, water-permeable concrete layer and graded broken stone layer) in the sidewalk water-permeable structure allows rainwater to infiltrate quickly, avoids the accumulation of rainwater on the road surface. After the preliminary filtration of rainwater through the graded broken stone layer, it enters the planting groove through the first perforated pipe and the first drainage pipe. In the planting groove, rainwater is further filtered and purified through the thick sand layer, the planting soil layer and the subsided vegetation pebble water storage layer, and finally discharged to the external rainwater well through the second perforated pipe and the second drainage pipe. This systematic design not only realizes the efficient collection and purification of rainwater, but also avoids the problem of collapsible loess settlement caused by rainwater infiltration, ensuring the safety of the sidewalk and the surrounding infrastructure.

[0017] 2. The utility model discloses a sidewalk adopts multilayer water-permeable material design, ensures that the road surface is dry in rainy days, reduces the risk of slipping of pedestrians. The combined design of the water-permeable brick layer, the cement mortar layer and the water-permeable concrete layer allows rainwater to infiltrate quickly, avoiding the formation of water accumulation on the surface of the sidewalk. This design not only improves the walking comfort of pedestrians, but also significantly reduces the risk of slipping caused by water accumulation, ensuring the safety of pedestrians.

[0018] 3. The multilayer structure in the planting groove can store and purify rainwater, delay runoff and reduce urban waterlogging. The subsided vegetation pebble water storage layer, the planting soil layer, the thick sand layer and the graded broken stone layer two are sequentially arranged in the planting groove. The subsided vegetation pebble water storage layer can temporarily store rainwater and delay the runoff speed of rainwater; the planting soil layer and the thick sand layer further filter impurities and pollutants in rainwater; the graded broken stone layer two provides a good infiltration channel for rainwater, which is finally discharged through the perforated pipe, not only reducing the pressure of rainwater runoff on the urban drainage system, but also realizing the resource utilization of rainwater and improving the ecological environment quality of the city.

[0019] 4. The utility model discloses a planting groove adopts a reinforced concrete prefabricated structure, which has high strength and stability. In addition, the steel wire ring embedded in the side wall of the planting groove is connected with the liner on the trunk of the sidewalk tree through a steel wire rope, which significantly enhances the anti-overturning ability of the sidewalk tree, not only ensuring the stability of the sidewalk tree in strong wind and other adverse weather conditions, but also improving the overall safety of the sidewalk and prolonging the service life of the sidewalk. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Among them:

[0022] 1, water permeable brick layer; 2, cement mortar layer; 3, water permeable concrete layer; 4, graded gravel layer one; 5, waterproof geomembrane; 6, rammed clay sealing layer; 7, first perforated pipe; 8, first drainage pipe; 9, planting groove; 10, sunken vegetation pebble water storage layer; 11, planting soil layer; 12, thick sand layer; 13, graded gravel layer two; 14, second perforated pipe; 15, second drainage pipe; 16, check valve; 17, concrete cushion layer; 18, steel wire ring; 19, steel wire rope; 20, street tree; 21, gasket; 22, rainwater well. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] As shown in the figure, a kind of collapsible loess area sponge city sidewalk structure, including sidewalk water permeable structure, waterproof geomembrane 5 is provided in the inside of sidewalk water permeable structure, graded gravel layer one 4 is provided above waterproof geomembrane 5, waterproof geomembrane 5 is used to block rainwater infiltration to collapsible loess layer, prevent soil settlement, the inside of graded gravel layer one 4 has first perforated pipe 7, first perforated pipe 7 is connected with the first drainage pipe 8 extending outward;

[0025] One side of sidewalk water permeable structure is equipped with planting groove 9, graded gravel layer two 13 is equipped in the bottom of planting groove 9, the end of first drainage pipe 8 extends to graded gravel layer two 13, second perforated pipe 14 is equipped in the inside of graded gravel layer two 13, second drainage pipe 15 is connected on second perforated pipe 14, the end of second drainage pipe 15 extends to the outside rainwater well 22, and check valve 16 is installed at the end of second drainage pipe 15.

[0026] Among them, the first perforated pipe 7 in the inside of graded gravel layer one 4 is provided with multiple small holes on outer wall, for collecting infiltrated rainwater, and rainwater is guided into planting groove 9 by first drainage pipe 8;The structure of second perforated pipe 14 arranged in graded gravel layer two 13 is same as first perforated pipe 7, second perforated pipe 14 is connected with second drainage pipe 15, rainwater can be guided into rainwater well 22 by second drainage pipe 15, and check valve 16 is arranged at the end of second drainage pipe 15 to prevent rainwater from backflowing.

[0027] The sidewalk water permeable structure further includes water permeable concrete layer 3, cement mortar layer 2 and water permeable brick layer 1 located on graded gravel layer one 4 in sequence;Further includes rammed clay sealing layer 6 located below waterproof geomembrane 5.

[0028] Specifically, in the sidewalk water-permeable structure, the thickness of the water-permeable brick layer 1 is 6 cm, high water-permeable ceramic water-permeable bricks can be used, and the surface has a microporous structure, or concrete water-permeable bricks are used to quickly guide the infiltration of rainwater.

[0029] The thickness of the cement mortar layer 2 is 3 cm, and a dry M10 cement mortar with a ratio of 1:5 is used to bond the water-permeable bricks and provide a certain flatness.

[0030] The thickness of the water-permeable concrete layer 3 is 15 cm, and water-permeable concrete with large porosity is used to quickly conduct rainwater to the lower layer.

[0031] The thickness of the graded gravel layer one 4 is 10 cm, for example, gravel with a particle size of 20-40 mm is used, which has good water permeability and compressive strength.

[0032] The thickness of the rammed clay sealing layer 6 is 30 cm, for example, clay with a compaction degree ≥93% is used to ensure the stability and impermeability of the roadbed.

[0033] The planting groove 9 is a reinforced concrete prefabricated structure, and the cross-sectional shape is a U-shaped structure.

[0034] Inside the planting groove 9 and above the graded gravel layer two 13, a thick sand layer 12, a planting soil layer 11, and a sunken vegetation pebble water storage layer 10 are sequentially arranged.

[0035] Specifically, the thickness of the sunken vegetation pebble water storage layer 10 is 10-15 cm, and is filled with pebbles and vegetation, which is used to temporarily store rainwater and slow down the runoff speed.

[0036] The thickness of the planting soil layer 11 is 150 cm, and nutrient-rich planting soil can be used to plant sidewalk trees 20.

[0037] The thickness of the thick sand layer 12 is 10 cm, and medium-coarse sand can be used to further filter rainwater.

[0038] The thickness of the graded gravel layer two 13 is 20 cm, which can be the same material as the above-mentioned graded gravel layer one 4, and is used to provide good drainage performance.

[0039] The outer bottom of the planting groove 9 is provided with a concrete cushion layer 17, and the thickness of the concrete cushion layer 17 is 10 cm, which is made of C20 concrete and is mainly used to support the main structure of the planting groove 9.

[0040] The street trees 20 are planted on the planting soil layer 11 inside the planting groove 9, the gaskets 21 are installed on the tree trunks of the street trees 20, a plurality of steel wire rings 18 are installed at the side wall positions of the planting groove 9, the steel wire rings 18 are connected with the gaskets 21 through the steel wire ropes 19, the steel wire rings 18 are pre-buried at the side wall positions of the planting groove 9 and are used for connecting the street trees 20 through the steel wire ropes 19, and the tightness of the steel wire ropes 19 can be adjusted according to the growth of the street trees 20, so that the stability of the street trees 20 is ensured.

[0041] The specific principle of the structure of the sponge city sidewalk in the collapsible loess area is as follows: when it rains, the rainwater first infiltrates into the graded gravel layer one 4 through the sidewalk water permeable brick layer 1, the cement mortar layer 2 and the water permeable concrete layer 3, and then is drained into the graded gravel layer two 13 in the planting groove 9 through the first perforated pipe 7 and the first drainage pipe 8. In the planting groove 9, the rainwater is filtered and purified through the sunken vegetation pebble water storage layer 10, the planting soil layer 11 and the thick sand layer 12, and the excess rainwater is discharged to the external rainwater well 22 through the second perforated pipe 14 and the second drainage pipe 15. The whole system realizes effective collection, purification and discharge of the rainwater, avoids the problem of settlement of collapsible loess caused by rainwater infiltration, and guarantees the safety of the sidewalk and the surrounding infrastructure.

[0042] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sponge city sidewalk structure for collapsible loess areas, characterized in that, It includes a permeable sidewalk structure, which is equipped with a waterproof geomembrane. A graded crushed stone layer is provided above the waterproof geomembrane. The graded crushed stone layer has a first perforated pipe inside, and the first perforated pipe is connected to a first outwardly extending drainage pipe. A planting trough is provided on one side of the permeable structure of the sidewalk. A graded crushed stone layer 2 is provided at the bottom of the planting trough. The end of the first drainage pipe extends into the graded crushed stone layer 2. A second perforated pipe is provided inside the graded crushed stone layer 2. A second drainage pipe is connected to the second perforated pipe. The end of the second drainage pipe extends into the external rainwater well, and a check valve is installed at the end of the second drainage pipe.

2. The sponge city sidewalk structure for collapsible loess areas according to claim 1, characterized in that, The permeable structure of the sidewalk also includes a permeable concrete layer, a cement mortar layer and a permeable brick layer located sequentially on the graded crushed stone layer; it also includes a compacted clay seal layer located under the waterproof geomembrane.

3. A sponge city sidewalk structure for collapsible loess areas according to claim 2, characterized in that, In the permeable structure of the sidewalk, the thickness of the permeable brick layer is 6cm, the thickness of the cement mortar layer is 3cm, the thickness of the permeable concrete layer is 15cm, the thickness of the graded crushed stone layer is 10cm, and the thickness of the rammed clay seal layer is 30cm.

4. A sponge city sidewalk structure for collapsible loess areas according to claim 1, characterized in that, The planting trough is a precast reinforced concrete structure with a U-shaped cross-section.

5. A sponge city sidewalk structure for collapsible loess areas according to claim 4, characterized in that, Inside the planting trough, above the graded crushed stone layer two, there are a thick sand layer, a planting soil layer, and a sunken vegetation pebble water storage layer.

6. A sponge city sidewalk structure for collapsible loess areas according to claim 5, characterized in that, The thickness of the sunken vegetation pebble water storage layer is 10cm-15cm, the thickness of the planting soil layer is 150cm, the thickness of the thick sand layer is 10cm, and the thickness of the graded crushed stone layer II is 20cm.

7. A sponge city sidewalk structure for collapsible loess areas according to claim 1, characterized in that, The bottom of the planting trough is provided with a concrete pad, which is 10cm thick.

8. A sponge city sidewalk structure for collapsible loess areas according to claim 5, characterized in that, Street trees are planted on the soil layer inside the planting trough. The trunks of the street trees are fitted with pads. Multiple wire rings are installed on the side walls of the planting trough, and the wire rings are connected to the pads by wire ropes.

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