CN115306009A - Novel drainage green belt construction method based on LID concept - Google Patents

Abstract

The invention relates to a green belt, and discloses a novel drainage green belt construction method based on LID concept, which comprises the following steps: firstly, measuring and paying off, and secondly, excavating a base groove (1); step three, installing a waterproof geotechnical cloth layer (26), and step four, constructing a gravel layer (25) and a medium-coarse sand layer (24); step five, mounting a water seepage geotextile layer (23), step six, backfilling planting soil, and planting vegetation after backfilling. The invention not only can effectively form a rainwater ecosystem for utilizing, discharging and storing accumulated water on the road surface, but also can effectively reduce the problems of water and soil loss, nutrient loss and the like of green belts.

Description

Construction method of new drainage green belt based on LID concept

technical field

The invention relates to a green belt, in particular to a new drainage green belt construction method based on the LID concept.

Background technique

With the rapid development of road engineering in our country, urban waterlogging has become a hot issue that people pay attention to. In the past, cities pursued "one row" for rainwater. The low urban drainage standards and the lack of rainwater utilization systems are the main reasons why resources become disasters. Therefore, we urgently need an environmental protection measure that can not only realize rainwater storage, infiltration and purification, but also ensure the safety of urban drainage and waterlogging prevention.

In order to improve the utilization rate of rainwater resources and improve the ecological environment protection mechanism, the LID concept, the design concept of "sponge city", came into being. In the framework of "sponge city", the road traffic system is one of the three major spaces of the city. It is a high-incidence area for waterlogging, and the urban road green belt is designed to be sunken to turn it into a sponge for water storage, which is of great significance to the establishment of a scientific and perfect urban green space water circulation system and the treatment of urban waterlogging.

The existing green belt based on the design concept of "sponge city" can realize the storage of accumulated water in the green belt, but the water, soil and nutrient loss of the green belt still need to be further improved.

Contents of the invention

The invention aims at the problems existing in the green belt based on the design concept of "sponge city" in the prior art, and provides a novel drainage green belt based on the LID concept.

In order to solve the above technical problems, the present invention is solved through the following technical solutions:

A new drainage green belt construction method based on the LID concept, which includes the following steps:

Step 1. Measure and set out the line, set up construction benchmarks and auxiliary construction baselines according to the coordinate control points and benchmarks, and set out to determine the elevation of the excavation surface and calculate the excavation depth to mark on the wooden piles according to the section size requirements of the drawings;

Step 2. Excavation of the foundation trench. Firstly, mechanically dig to the soil layer 5-10cm above the design trench bottom elevation, and then manually dig to the design trench bottom elevation;

Step ³ , the waterproof geotextile layer is installed, using a waterproof geotextile with a cloth and a membrane of 600g/m2, and laying it by a scraper;

Step 4, construction of gravel layer and medium-coarse sand layer; paving gravel and medium-coarse sand in sequence on the waterproof geotextile by paver;

Step 5: Install the water-permeable geotextile layer, laying 300g/ ^m2 geotextile on the medium-coarse sand layer by scraper;

Step 6: backfill the planting soil, and plant vegetation after backfilling.

As a preference, after the excavation of the foundation trench in step 2, the side wall of the foundation trench needs to be supported in time by means of support plates and cross braces. The support plate can effectively prevent the damage to the road curb stone caused by the instability of the slope of the foundation trench.

As preferably, after the foundation trench is dug, the rainwater pipe is installed before the waterproof geotextile layer is installed, the rainwater pipe includes a vertical pipe and a first horizontal pipe and a second horizontal pipe arranged at the bottom of the vertical pipe, the first horizontal pipe and the rainwater The well is connected, the second horizontal pipe is arranged along the length direction of the green belt body and the pipe wall is provided with seepage holes, and the upper end of the vertical pipe is provided with a cover protruding from the vegetation layer, and the cover is provided with an overflow hole.

Part of the water entering the rainwater pipe penetrates into the underlying soil through the seepage holes at the bottom, and the other part is discharged into the rainwater well to reasonably distribute the rainwater and fully relieve the pressure of rainwater accumulation in various locations. The setting of the cover can prevent leaves and lumps from entering the rainwater pipe. The cover is set on the upper part of the vegetation layer, which can make the rainwater infiltrate and absorb when only a small amount of water accumulates. When the amount of rainwater is large, it will be discharged through the rainwater pipe. Internal stormwater wells store water pressure.

As a preference, before installing the rainwater pipe, a pipe installation plate is arranged in the base groove, and the pipe installation plate includes a horizontal plate and a vertical plate; then the vertical pipe is fixed against the vertical plate, and the first horizontal pipe and the second horizontal pipe are It is supported on the end face of the horizontal plate. The setting of the pipe installation plate can effectively ensure the installation stability of the rainwater pipe in the foundation groove, and at the same time avoid the inclination of the rainwater pipe when setting each layer of the green belt body, which is convenient for construction and improves work efficiency.

中粗砂层中的中粗砂直径为8mm以下。碎石层和中粗砂层合适粒径的设置一方面能够保证种植土层的稳定性，防止下沉，另一方面还使得渗入种植土层内的水及时排出，减小对植被层积水影响。As preferably, the gravel particle size in the crushed stone layer in step 4 is

The medium-coarse sand in the medium-coarse sand layer has a diameter of 8mm or less. The setting of the appropriate particle size of the crushed stone layer and the medium-coarse sand layer can ensure the stability of the planting soil layer and prevent subsidence. influences.

As a preference, when paving the crushed stone layer and the medium-coarse sand layer, the material transportation and paving should be carried out in sequence from far to near, and the required materials should be placed in sections according to the pre-calculated amount. The gradation distribution should be uniform and consistent, without obvious particle separation.

As a preference, the particle size of the soil block in the planting soil layer in step 6 is 1-2 cm.

The present invention has remarkable technical effect owing to adopted above technical scheme:

The invention not only can effectively form a rainwater ecological system for utilization, discharge and storage of road area water, but also can effectively reduce problems such as water and soil loss and nutrient loss in green belts.

Description of drawings

Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of the base trench in Fig. 1 .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1

A new type of drainage green belt based on the LID concept, as shown in Figure 1 and Figure 2, includes a base groove 1, a green belt body 2 is arranged in the base groove 1, and the outside of the base groove 1 notch and along the length direction of the green belt body 2 Both sides are provided with curb stone 3 and curb stone 4, and curb stone 4 is provided with the drain outlet 41 toward green belt body 2, and the inner side of curb stone 3 is the inclined surface toward green belt body 2 in the present embodiment, The outer side is a step surface, and the roadside stone 4 is arranged on the step level of the outer step surface of the curb stone 3. The upper end surface of the roadside stone 4 is higher than the upper end of the curb stone 3. It flows into the upper end surface of the green belt body 2 through the drain port 41, and is gradually drained and discharged through the green belt body 2.

中粗砂层24中的中粗砂直径为8mm以下，铺设厚度均为25cm。The green belt body 2 includes a vegetation layer 21, a planting soil layer 22, a water seepage geotextile layer 23, a medium-coarse sand layer 24, a gravel layer 25 and a waterproof geotextile layer 26 from top to bottom. There is a rainwater pipeline 5 connected to the rainwater well, the foundation groove 1 is a trapezoidal groove whose width gradually decreases from top to bottom, the planting soil layer 22, the water seepage geotextile layer 23, the medium coarse sand layer 24, the crushed stone layer 25 and the waterproof geotextile The cloth layers 26 are laid sequentially in the foundation trench 1 . The green belt body 2 in this embodiment adopts a multi-layer structure, and the water-permeable geotextile layer 23 is specially set to effectively reduce the soil and nutrient loss of the planting soil layer 22, and a waterproof geotextile layer 26 is also set at the bottom of the foundation groove 1, which adopts One cloth and one film 600g/m ² , it needs to have good mechanical function, anti-corrosion, anti-aging, has the functions of isolation, waterproof, drainage, protection, stability, etc. Can maintain the original function. At the same time, the medium coarse sand layer 24 and the crushed stone layer 25 are filled in the middle part of the foundation trench 1, which effectively improves the stability of the planting soil layer 22, and can make the water infiltrated into the planting soil layer 22 be discharged in time, avoiding the long-term accumulation of the planting soil layer 22. Water situation affects vegetation, and in the present embodiment, gravel particle diameter is in gravel layer 25

The diameter of the medium-coarse sand in the medium-coarse sand layer 24 is less than 8 mm, and the laying thickness is 25 cm.

In addition, the side wall of the foundation tank 1 is provided with a supporting plate 6, which is arranged in a stepped form from top to bottom on the side wall of the base tank 1, and the supporting plate 6 arranged in a stepped shape can support more stably. Protected on the side wall of the foundation trench 1, it can effectively prevent the side slope of the foundation trench 1 from being unstable and causing damage to the road curb 3.

In this embodiment, the rainwater pipeline 5 includes a vertical pipe 51 and a first horizontal pipe 52 and a second horizontal pipe 53 arranged at the bottom of the vertical pipe 51. The first horizontal pipe 52 communicates with the rainwater well, and the second horizontal pipe 53 is arranged along the greening line. The belt body 2 is arranged along the length direction and the pipe wall is provided with seepage holes.

Wherein, the upper end of the vertical pipe 51 is provided with a cover 54 protruding from the vegetation layer 21, the cover 54 is provided with an overflow hole, and a pipeline mounting plate 7 is also pre-embedded in the green belt body 2, and the pipeline mounting plate 7 includes The horizontal plate 71 and the vertical plate 72 , the vertical tube 51 is arranged close to the vertical plate 72 , and the first transverse tube 52 and the second transverse tube 53 are both supported on the upper end surface of the horizontal plate 71 .

The new drainage green belt construction method based on the LID concept is also provided in the present embodiment, which includes the following steps:

Step 1. Measure and set out the line, set up construction benchmarks and auxiliary construction baselines according to the coordinate control points and benchmarks, and set out to determine the elevation of the excavation surface and calculate the excavation depth to mark on the wooden piles according to the section size requirements of the drawings;

Step 2. Excavation of foundation trench 1. Firstly, digging mechanically to the soil layer 5-10cm above the design trench bottom elevation, and then manually digging to the design trench bottom elevation. This method of first mechanical and then manual can not only effectively improve the work efficiency, and can avoid over-excavation and disturbance of the undisturbed soil; since the average excavation depth is about 1.6 meters, and the two sides are compacted soil foundations, slope excavation is adopted, so the excavation of foundation trench 1 in this embodiment is still The side wall of the foundation trench 1 needs to be supported in time by means of support plates 6 plus cross braces. The support plates 6 used in this embodiment are wooden boards and are arranged in steps from top to bottom on the side walls of the foundation trench 1. The support plate 6 arranged in steps can be more stably supported on the side wall of the foundation trench 1 , effectively preventing the road curb 3 from being damaged by the instability of the side slope of the foundation trench 1 .

Step 3, the waterproof geotextile layer 26 is installed, using a waterproof geotextile of 600g/m ² with one cloth and one film, and laying it by a scraper; the waterproof geotextile must have good mechanical properties, and be able to resist corrosion and aging. Waterproof, drainage, protection, stability and other functions, it can resist the damage of external force during construction, the creep is small, and it can still maintain the original function under long-term load.

Wherein, waterproof geotextile layer 26 laying methods comprise:

(1) The anti-seepage geotextile material has a large weight, so it should be transported and laid by a scraper;

(2) The seams of anti-seepage geotextiles must be parallel to the center line of the road;

(3) Damage and repair must meet the following technical requirements;

① The patch material used to fill holes or cracks must be consistent with the material of the anti-seepage geotextile;

②The patch should extend at least 30 cm outside the range of the damaged geotextile.

(4) After the anti-seepage geotextile is installed, the construction surface should be inspected, and objects that may puncture the anti-seepage geotextile should be cleaned up.

中粗砂直径不大于8mm，按设计厚度一次铺平，运料及摊铺应先远后近循序进行，所需材料按预先计算量分段分堆放置，采用人工配合机械进行摊铺，摊铺碎石时应级配分布均匀一致，无明显颗粒分离现象，严禁用四齿耙拉平料堆，造成粗细料局部集中，对摊铺时发生的粗细料集中情况应及时处理。Step 4, gravel layer 25 and medium-coarse sand layer 24 construction; lay gravel and medium-coarse sand successively on the waterproof geotextile by paver; pave the gravel layer 25 and medium-coarse sand layer 24, transport to the site After the crushed stones are leveled, the large and small particles should be evenly distributed, and the particle size of the gravel should be controlled within

The diameter of the medium-coarse sand is not more than 8mm, and it should be paved at one time according to the designed thickness. The material transportation and paving should be carried out in sequence from far to near, and the required materials should be placed in sections according to the pre-calculated amount. When crushing stones, the grading distribution should be uniform, and there should be no obvious particle separation. It is strictly forbidden to level the stockpile with a four-tooth rake, which will cause local concentration of coarse and fine materials. The concentration of coarse and fine materials that occurs during paving should be dealt with in time.

Step 5, the water-permeable geotextile layer 23 is installed, and a 300g/m ² geotextile is laid on the medium-coarse sand layer 24 by a scraper;

Step 6. Backfill the planting soil. Plant vegetation after backfilling. In addition to meeting the requirements of salt and PH value, the planting soil needs to control the particle size of the soil block to be about 1-2cm, and the soil block with a particle size of 2-4cm does not exceed 10%. , the surface is finely divided, loose, moist, free of sundries, and has a certain fertility. Before filling the soil, clean up the rubbish and other sundries on the base soil.

In this embodiment, after the foundation trench 1 is dug, the rainwater pipe 5 is installed before the waterproof geotextile layer 26 is installed. The rainwater pipe 5 includes a vertical pipe 51 and a first transverse pipe 52 and a second transverse pipe 52 arranged at the bottom of the vertical pipe 51. Pipe 53, the first transverse pipe 52 communicates with the rainwater well, the second transverse pipe 53 is arranged along the length direction of the green belt body 2 and the pipe wall is provided with water seepage holes, and the upper end of the vertical pipe 51 is provided with a hole extending out of the vegetation layer 21. Blocking cover 54, blocking cover 54 is provided with overflow hole, before installing rainwater pipe 5, pipe mounting plate 7 is set in base groove 1 earlier, and pipe mounting plate 7 comprises horizontal plate 71 and vertical plate 72; Then make vertical pipe 51 is fixed against the vertical plate 72 , and the first transverse tube 52 and the second transverse tube 53 are both supported on the upper end surface of the horizontal plate 71 .

After the rainfall, the rainwater on the road surface collects towards the green belt through the cross slope of the road, flows into the green belt from the outfall 41 in the roadside stone 4 on both sides of the green belt, and a part of the rainwater collected into the green belt is collected in the surface soil of the green belt. Seep, the part that can't infiltrate then sinks into the overflow hole of the rainwater pipe 5 in the green belt, and enters the rainwater pipe through the overflow hole, and a part of the water entering the vertical pipe 51 in the rainwater pipe flows through the second horizontal pipe 53 penetrates into the soil at the bottom of the green belt body 2 through the seepage holes on it, and the other part is discharged into the urban rainwater well through the first horizontal pipe 52 for subsequent use. The overall process realizes the utilization, discharge and storage of road surface water. A relatively complete rainwater ecosystem is formed, which can effectively filter the soil and garbage in the water, prevent the rainwater pipe 5 from being blocked, reduce the cleaning work of the pipeline in the later stage, and save 30% of the cleaning and maintenance cost in the later stage. At the same time, it can effectively prevent the flow of water from causing soil erosion and vegetation damage to the green belt. It can also collect rainwater and effectively use water resources. Compared with traditional construction methods, it can save about 8% of the overall cost. This construction method promotes the construction technology of green belts. It has good promotion and application value and broad market application prospects.

In a word, the above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Claims (7)

1. The new drainage green belt construction method based on the LID concept is characterized in that it comprises the following steps: Step 1. Measure and set out the line, set up construction benchmarks and auxiliary construction baselines according to the coordinate control points and benchmarks, and set out to determine the elevation of the excavation surface and calculate the excavation depth to mark on the wooden piles according to the section size requirements of the drawings; Step 2. Excavation of the foundation trench (1), first by mechanically digging to the soil layer 5-10 cm above the design trench bottom elevation, and then manually digging to the design trench bottom elevation; Step 3, waterproof geotextile layer (26) is installed, adopts the waterproof geotextile of one cloth one film 600g/m ² , lays by scraper; Step 4, construction of the gravel layer (25) and the medium-coarse sand layer (24); laying gravel and medium-coarse sand successively on the waterproof geotextile by a paver; Step 5, the water seepage geotextile layer (23) is installed, and a 300g/m ² geotextile is laid on the medium coarse sand layer (24) by a scraper; Step 6: backfill the planting soil, and plant vegetation after backfilling. 2. the novel drainage green belt construction method based on the LID concept according to claim 1, is characterized in that: after the excavation of the foundation groove (1) in step 2, it is also necessary to adopt a support plate (1) side wall to the foundation groove (1) 6) Support in time by adding cross braces. 3. the novel drainage green belt construction method based on the LID concept according to claim 1, is characterized in that: after the base trench (1) is dug, the rainwater pipeline (5) is installed before the waterproof geotextile layer (26) is installed, The rainwater pipe (5) includes a vertical pipe (51) and a first horizontal pipe (52) and a second horizontal pipe (53) arranged at the bottom of the vertical pipe (51), and the first horizontal pipe (52) communicates with the rainwater well , the second horizontal pipe (53) is arranged along the length direction of the green belt body (2) and the pipe wall is provided with seepage holes, and the upper end of the vertical pipe (51) is provided with a cover (54) extending out of the vegetation layer (21). ), the cover (54) is provided with an overflow hole. 4. The new drainage green belt construction method based on the LID concept according to claim 3 is characterized in that: before installing the rainwater pipeline (5), the pipeline installation plate (7) is first set in the base groove (1), and the pipeline installation plate (7) comprise horizontal plate (71) and vertical plate (72); Then make vertical pipe (51) close to vertical plate (72) and fix, first transverse pipe (52) and second transverse pipe (53) All are supported on the upper end face of the horizontal plate (71). 5. the novel drainage green belt construction method based on LID concept according to claim 3, is characterized in that: in step 4, gravel particle diameter is in gravel layer (25)

The medium-coarse sand in the medium-coarse sand layer (24) has a diameter of 8 mm or less. 6. The construction method of the novel drainage green belt based on the LID concept according to claim 5, characterized in that: when laying the gravel layer (25) and the medium-coarse sand layer (24), the material transportation and paving should be carried out in sequence from far to near , The required materials are placed in sections according to the pre-calculated amount, and paving is carried out manually and mechanically. When paving gravel, the gradation and distribution should be uniform, and there is no obvious particle separation. 7. The new drainage green belt construction method based on the LID concept according to claim 1, characterized in that: the soil block particle size in the planting soil layer (22) in step 6 is 1-2cm.

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