CN112093904A - Subsurface flow wetland construction method - Google Patents
Subsurface flow wetland construction method Download PDFInfo
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Abstract
The invention discloses an underflow wetland construction method, which relates to the field of underflow wetland construction, and comprises the following steps: carrying out impermeable membrane laying operation on an area to be constructed; then fine sand laying operation is carried out; backfilling the ecological materials to ensure that a packing layer is formed on the subsurface flow wetland; constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of the packing layer of the subsurface flow wetland, and enabling water to flow into wetland packing downwards through uniform holes on the water distribution pipeline after the water flows through the water distribution pipeline; and backfilling the planting soil. The subsurface flow wetland construction method mainly protects the realization of high-efficiency treatment of the subsurface flow wetland and large-area subsurface flow wetland anti-seepage treatment operation by adopting a specific construction mode and process.
Description
Technical Field
The invention relates to the field of wetland construction, in particular to an underflow wetland construction method.
Background
As is well known, subsurface flow wetlands are the most widely used type of constructed wetlands. The subsurface flow wetland is an artificial landscape which takes hydrophilic plants as surface greening materials and sandstone soil as fillers and leads water to permeate and filter naturally. The subsurface flow wetland has the characteristics of no surface water, small occupied area, high utilization rate and convenient maintenance, and is also widely applied to environmental construction.
Researchers find that the structure of the traditional subsurface flow wetland is simple, but the structure and the working condition environment of the traditional subsurface flow wetland are too complex in a certain project, and the structure and the working condition environment are especially important for ensuring the anti-seepage treatment of the large-area subsurface flow wetland and performing the water quality purification treatment.
Disclosure of Invention
The invention aims to provide a subsurface flow wetland construction method to solve the technical problem that seepage-proofing treatment of a large-area subsurface flow wetland cannot be realized in the prior art.
The embodiment of the invention provides a subsurface flow wetland construction method, which comprises the following steps:
carrying out impermeable membrane laying operation on an area to be constructed;
then fine sand laying operation is carried out;
backfilling the ecological materials to ensure that a packing layer is formed on the subsurface flow wetland;
constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of the packing layer of the subsurface flow wetland, and enabling water to flow into wetland packing downwards through uniform holes on the water distribution pipeline after the water flows through the water distribution pipeline;
backfilling planting soil, namely covering the upper layer of the filler with the planting soil with a preset thickness size to form a planting soil layer after the construction of the filler layer is finished;
and carrying out planting construction operation on aquatic plants and trees in the tree pool on a planting soil layer of the subsurface flow wetland.
Preferably, as one possible embodiment; the preset thickness dimension is 20 cm.
Preferably, as one possible embodiment; before the construction of the impermeable membrane laying operation of the area to be constructed, the operation of performing construction protection on the impermeable membrane is also performed;
a10 cm coarse sand protective layer was laid before the impermeable membrane was laid.
Preferably, as one possible embodiment; in the process of implementing impermeable membrane laying operation on the area to be constructed, the impermeable membrane laying operation on the area to be constructed specifically comprises the following steps;
the coiled membrane cloth is straightened and laid from one end of the underflow pool wall where the area to be constructed is located to the other end; reserving a 30-40cm crimp joint at the top of the tank, and reserving a 20cm lap joint between the adjacent impermeable membranes;
welding the adjacent overlapped impermeable films by using a hot melting machine, wherein the welding overlapping width of the adjacent impermeable films is 20 cm;
the anti-seepage film is well adhered to the wall of the undercurrent pool where the area to be constructed is located; after the anti-seepage film is adhered, the adhered part is pressed and fixed by a steel edge strip, and the steel edge strip is riveted on the wall of the undercurrent pool.
Preferably, as one possible embodiment; the fine sand laying operation is implemented by the following specific steps:
screening large-particle stones and impurities from the fine sand transported to the construction site, and preventing the brick tiles with sharp edges from entering the fine sand; the precision of the fine sand is particles with the particle size of more than 0.075mm-0.085 mm;
the artificial uniform spreading is used at the bottom of the rammed undercurrent pool, and the thickness is kept at 15 cm.
Preferably, as one possible embodiment; the ecological material backfilling operation ensures that a packing layer is formed on the subsurface flow wetland, and specifically comprises the following operation steps:
in order to ensure the protection of the impermeable film, a bamboo plywood is laid on the filler to be used as a temporary lane;
the filler transport vehicle can only carry out straight-forward and straight-back unloading operation at a constant speed when moving on the filler;
the height ratio of filler is higher than preset height by 5cm, prevents that the filler from sinking and causing the filler thickness not enough.
Preferably, as one possible embodiment; constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of a packing layer of the subsurface flow wetland, and making water flow downwards flow into wetland packing in the construction process through uniform holes on the water distribution pipeline after the water flow passes through the water distribution pipeline;
the water collecting pipe is a drainage pipeline of the subsurface flow wetland, and a De110UPVC pipe is adopted as a water collecting main pipe of the water collecting pipe and is arranged in the subsurface flow wetland;
a De63UPVC pipe is adopted as a water collecting branch pipe of the water collecting pipe and is arranged in the undercurrent pool; the main water collecting pipe is connected and communicated with the branch water collecting pipe; uniformly arranging holes on each section of the water distribution branch pipe, wherein the distance between every two holes is 250mm, the aperture is 10mm, and the holes are uniformly arranged in a plum blossom shape;
a plurality of vent pipes are arranged, the vent pipes adopt De63UPVC, and the vent pipes are connected with the water collecting branch pipes in a tee joint mode.
Preferably, as one possible embodiment; the water distribution pipeline is a water inlet distribution pipeline of the undercurrent pool, and a De110UPVC pipe is adopted as a main water distribution pipe of the water distribution pipeline and is arranged in the undercurrent pool;
a De63UPVC pipe is adopted as a water distribution branch pipe of the water distribution pipeline and is arranged in the undercurrent pool;
the water distribution branch pipes are uniformly provided with openings, the distance between the openings is 250mm, the aperture is 10mm, and the openings are uniformly arranged in a plum blossom shape.
Preferably, as one possible embodiment; before the impermeable membrane laying operation of the area to be constructed is carried out, the following operation steps are also carried out;
performing a ditch slotting operation; clearing and compacting a filling area, and organizing a mechanical excavation ditch foundation, a tree pool foundation and a wooden trestle foundation;
basic processing operation; ensuring that the bearing capacity characteristic value of the bearing capacity of the floor bearing layer of the ditch foundation, the tree pool foundation and the wooden trestle foundation is 120 kPa;
concrete engineering construction operation; the concrete construction project comprises a diversion canal, a water distribution canal, a water collecting canal, a tree pool, a retaining wall and a wooden trestle foundation, wherein the construction operation forms the subsurface flow wetland of a region to be constructed.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
by adopting the technical scheme, the subsurface flow wetland construction method provided by the application has the following technical effects:
in the technical scheme, impermeable film laying operation is carried out on the area to be constructed; then fine sand laying operation is carried out; backfilling the ecological materials to ensure that a packing layer is formed on the subsurface flow wetland; constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of the packing layer of the subsurface flow wetland, and enabling water to flow into wetland packing downwards through uniform holes on the water distribution pipeline after the water flows through the water distribution pipeline; and backfilling the planting soil. The subsurface flow wetland construction method mainly protects the realization of high-efficiency treatment of the subsurface flow wetland and large-area subsurface flow wetland anti-seepage treatment operation by adopting a specific construction mode and process. Compared with the prior art, the construction process is simplified, the construction efficiency and the construction quality are improved, and the seepage-proofing effect of the subsurface flow wetland is improved from various angles and modes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow chart of the subsurface wetland construction method provided by the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that "connected" is to be understood broadly, for example, it may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The embodiment of the invention provides a subsurface flow wetland construction method, which comprises the following operation steps:
step S41: carrying out impermeable membrane laying operation on an area to be constructed;
step S42: then fine sand laying operation is carried out;
step S43: backfilling the ecological materials to ensure that a packing layer is formed on the subsurface flow wetland;
step S44: constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of the packing layer of the subsurface flow wetland, and enabling water to flow into wetland packing downwards through uniform holes on the water distribution pipeline after the water flows through the water distribution pipeline;
step S45: backfilling planting soil, namely covering the upper layer of the filler with the planting soil with a preset thickness size to form a planting soil layer after the construction of the filler layer is finished;
step S46: and carrying out planting construction operation on aquatic plants and trees in the tree pool on a planting soil layer of the subsurface flow wetland.
Preferably, as one possible embodiment; the preset thickness dimension is 20 cm.
Preferably, as one possible embodiment; before the construction of the impermeable membrane laying operation of the area to be constructed, the operation of performing construction protection on the impermeable membrane is also performed;
step S40: a10 cm coarse sand protective layer was laid before the impermeable membrane was laid.
Preferably, as one possible embodiment; in step S41, the impermeable membrane laying operation performed on the area to be constructed specifically includes the following steps;
step S411, the coiled membrane cloth is straightened and laid from one end of the underflow pool wall where the area to be constructed is located to the other end; reserving a 30-40cm crimp joint at the top of the tank, and reserving a 20cm lap joint between the adjacent impermeable membranes;
step S412, welding the adjacent overlapped impermeable films by using a hot melting machine, wherein the welding overlapping width of the adjacent impermeable films is 20 cm;
step S413, gluing the anti-seepage film and the wall of the undercurrent pool where the area to be constructed is; after the anti-seepage film is adhered, the adhered part is pressed and fixed by a steel edge strip, and the steel edge strip is riveted on the wall of the undercurrent pool.
Preferably, as one possible embodiment; in step S42, the fine sand paving operation includes the following steps:
step S421: screening large-particle stones and impurities from the fine sand transported to the construction site, and preventing the brick tiles with sharp edges from entering the fine sand; the precision of the fine sand is particles with the particle size of more than 0.075mm-0.085 mm;
step S422: the artificial uniform spreading is used at the bottom of the rammed undercurrent pool, and the thickness is kept at 15 cm.
Preferably, as one possible embodiment; in step S43, the ecological material backfilling operation to ensure that the filler layer is formed on the subsurface flow wetland includes the following steps:
step S431: in order to ensure the protection of the impermeable film, a bamboo plywood is laid on the filler to be used as a temporary lane;
step S432: the filler transport vehicle can only carry out straight-forward and straight-back unloading operation at a constant speed when moving on the filler;
step S433: the height ratio of filler is higher than preset height by 5cm, prevents that the filler from sinking and causing the filler thickness not enough.
Preferably, as one possible embodiment; during the construction process of the step S44; the water collecting pipe is a drainage pipeline of the subsurface flow wetland, and a De110UPVC pipe is adopted as a water collecting main pipe of the water collecting pipe and is arranged in the subsurface flow wetland;
a De63UPVC pipe is adopted as a water collecting branch pipe of the water collecting pipe and is arranged in the undercurrent pool; the main water collecting pipe is connected and communicated with the branch water collecting pipe; uniformly arranging holes on each section of the water distribution branch pipe, wherein the distance between every two holes is 250mm, the aperture is 10mm, and the holes are uniformly arranged in a plum blossom shape;
a plurality of vent pipes are arranged, the vent pipes adopt De63UPVC, and the vent pipes are connected with the water collecting branch pipes in a tee joint mode.
Preferably, as one possible embodiment; the water distribution pipeline is a water inlet distribution pipeline of the undercurrent pool, and a De110UPVC pipe is adopted as a main water distribution pipe of the water distribution pipeline and is arranged in the undercurrent pool;
a De63UPVC pipe is adopted as a water distribution branch pipe of the water distribution pipeline and is arranged in the undercurrent pool;
the water distribution branch pipes are uniformly provided with openings, the distance between the openings is 250mm, the aperture is 10mm, and the openings are uniformly arranged in a plum blossom shape.
Preferably, as one possible embodiment; the following steps are also executed before step S41 is executed;
s10, performing a water channel grooving operation; clearing and compacting a filling area, and organizing a mechanical excavation ditch foundation, a tree pool foundation and a wooden trestle foundation; meanwhile, after the foundation trench is excavated, the earth surface is strictly prohibited from infiltrating foundation soil, and meanwhile, drilling work is needed;
s20, basic processing operation; ensuring that the bearing capacity characteristic value of the bearing capacity of the floor bearing layer of the ditch foundation, the tree pool foundation and the wooden trestle foundation is 120 kPa; the bearing capacity characteristic value of the bearing capacity layers of the engineering water channel and the foundation slab of the embodiment of the invention is 120kPa, if the bearing capacity characteristic value cannot be met, the bearing capacity characteristic value needs to be changed and filled, and the changing and filling method comprises the following steps: 1. removing weeds and deficient soil; 2. backfilling with mountain stone to the bottom of the cushion layer; 3. the filling requires layered compaction (4 layers), each layer being 250mm thick, and a compaction factor > 0.97.
S30, concrete engineering construction operation; the concrete construction project comprises a diversion canal, a water distribution canal, a water collecting canal, a tree pool, a retaining wall and a wooden trestle foundation, wherein the construction operation forms the subsurface flow wetland of a region to be constructed. The concrete of the canal of each structure is C30 grade impervious concrete, and the impervious grade is P6. The strength grade of the cement is not lower than 42.5MPa by adopting common Portland cement. The strength grade of the cement is not lower than 42.5MPa, and the cement must have factory pass and retest when entering the field. Construction technicians are familiar with drawings and specifications before construction, complete bottom-crossing work of construction technical schemes and safety technologies, and comprehensively master construction key points and nodes.
In the internal construction process of the subsurface flow wetland of the embodiment of the invention: the main construction process of the subsurface flow wetland comprises the following specific operation processes of laying two films (900 g/square meter) → 15cm thick fine sand, laying non-woven fabrics (300 g/square meter), mounting water collecting pipes, backfilling 105cm thick ecological fillers, mounting water distributing pipes, backfilling non-woven fabrics (300 g/square meter) → 20cm thick planting soil and planting aquatic plants;
step S41: the impermeable film laying (HDPE two-cloth one-film) is one of the important technical innovation points of the embodiment of the invention; and a, in view of protection of the anti-seepage film, a 10cm coarse sand protective layer is laid before the anti-seepage film is laid. b, when the anti-seepage film is laid, 6-8 people lay the rolled film cloth right, spread the film cloth from one end of the tank wall to the other end of the tank wall, stick to the wall body, lay the anti-seepage film to the uniform height of the filler epithelium, reserve a pressure joint at the top of the tank for 30-40cm, and reserve a lap joint for 20cm between the anti-seepage film and the film. c, welding the anti-seepage film by using a hot melting machine, wherein the laying and overlapping of the anti-seepage film is 20cm, cleaning the overlapping part of the anti-seepage film by using a cleaning cloth, otherwise, welding is not performed, the welding line is uniform and has no broken hole, current is kept during welding, the temperature of the hot melting machine is well controlled, and the anti-seepage film is prevented from being scalded. d, the anti-seepage film and the wall of the undercurrent pool are well adhered by the special geomembrane adhesive, the decocted special adhesive is required to be adhered with the anti-seepage film as soon as possible so as to prevent the colloid from losing the hydrophilic and strong viscosity after the temperature is reduced, and the colloid is decocted at any time. After the anti-seepage film is adhered, the adhered part is pressed and fixed by a steel edge strip, and the steel edge strip is riveted on the wall of the undercurrent pool. And e, a certain expansion and shrinkage amount is reserved when the impermeable membrane is laid, and the impermeable membrane is reserved uniformly, so that all connectors are prevented from being broken when the whole membrane sinks due to pressure when the filler is filled.
Step S42: fine sand laying operation: and screening out large-particle stones and impurities from the fine sand conveyed to the construction site, preventing brick tiles with sharp edges from entering the sand, loading a small-sized dump truck by using a forklift, conveying the small-sized dump truck into a subsurface flow wetland bed body, and manually and uniformly spreading the small-sized dump truck at the bottom of the rammed subsurface flow pond after the dump truck is used, wherein the thickness of the small-sized dump truck is kept at 15 cm. Before the thin sand is paved on the anti-seepage film, the thick sand and the thin sand must be tamped by pouring, wetting and tamping, so that the situation that people step on the anti-seepage film when paving the anti-seepage film and sink due to soft texture is avoided, and the situation that the welding port of the anti-seepage film is broken by sinking is avoided.
Step S43: backfilling the ecological materials: the ecological filler is fed in batches according to the site construction progress, the crushed stone is supplied by a local stock ground, the zeolite and the volcanic rock need to be transported far away, and the filler is mixed according to the proportion of 1:1:1 after being fed into the site. And (3) backfilling the peripheral pool of the underflow pool by using a 50 loader, backfilling part of the peripheral pool with a 30 loader when the working surface is narrow, backfilling most of the area in the pool by using a small transport vehicle, backfilling the transport vehicle from near to far in place at one time, and leveling by using a small excavator in cooperation with manpower. When the filler is backfilled, impurities, soil, branches and leaves of the household garbage are strictly forbidden to be doped, so that the water collection and distribution pipeline is prevented from being blocked. The filler transport vehicle can only move straight and back at a constant speed on the filler upper vehicle without turning and emergency braking, and temporary lanes can be built by bamboo rubber plates in partial areas. The height of the filler is 5cm higher than the design height, so that the insufficient thickness of the filler caused by filler sinking is prevented. And vehicles and people are strictly prohibited to run on the filler after the filler is backfilled, and the filler is fragile, so that the filler particles are prevented from being crushed, and the filtering and adsorbing effects cannot be realized.
In the above step S44: water collecting and distributing pipeline installation:
a, mounting a water collecting pipeline; the water collecting pipes are evenly distributed on the water collecting pipelines in the subsurface flow wetland, the water collecting pipes are constructed according to a construction drawing and evenly distributed at the lower part of the subsurface flow wetland filler, incoming water is filtered and purified by the ecological filler, collected by holes of the branch pipes on the water collecting pipes, collected to the water collecting main pipe, flows to the water collecting channel and then flows to the surface flow wetland. The water collecting pipes are drainage pipes of the subsurface wetland, De110UPVC pipes are adopted, four water collecting main pipes are arranged in each area in the subsurface wetland, each water collecting main pipe is 40m long (constructed according to the size of each unit construction drawing), each main pipe is uniformly arranged according to a pipeline branch pipe distribution diagram and laid according to the requirement of the central elevation of each unit pipe, the branch pipes are De63UPVC pipes, each unit is provided with corresponding number of vent pipes according to the construction drawing, the vent pipes are De63UPVC, and the vent holes are connected with the water collecting branch pipes in a De110UPVC multiplied by 63 tee joint mode. The upper opening of the vent pipe is flush with the upper skin of the subsurface wetland retaining wall, and each water distribution branch pipe is uniformly provided with openings with the spacing of 250mm and the aperture of 10mm, which are uniformly arranged in a plum blossom shape. One air-discharge outlet is arranged on each unit, and a DN200 gate valve set is arranged.
b, installing a water distribution pipeline; the water distribution pipes are uniformly arranged at the upper part of the wetland packing layer and are arranged according to the construction drawing arrangement elevation, water flows downwards into wetland packing through uniform holes on the pipes after passing through the water distribution pipes, the water inlet distribution pipes of the subsurface flow wetland are De110UPVC pipes, each area in the subsurface flow pond is provided with four main water distribution pipes, and the length of each main pipe is constructed according to the size of each unit construction drawing. The water distribution branch pipes are arranged on the main water distribution pipe at uniform intervals, the pipe fittings are laid according to the requirement of the central elevation of each unit pipe, the branch pipes are De63UPVC pipes and are connected by adopting a De110UPVC multiplied by 63 three-way pipe fitting, the uniform holes on each section of water distribution branch pipe are 250mm as the hole intervals of the water collecting pipes, the hole diameter is 10mm, and the water distribution branch pipes are uniformly arranged in a plum blossom shape.
During construction of each subsurface flow wetland unit cloth and water collecting pipeline, due to cross construction with the filler, the balance degree of the pipeline is noticed and the pipeline is protected, so that the pipeline is prevented from being damaged by rolling in the filler filling process.
c, water collecting pipeline protection measures: before the water collecting pipeline is laid, fine sand with the thickness of 15cm is laid, and a layer of geotextile is laid; when the water is filled, the water is lightly taken and lightly placed, and small equipment can walk when the water collecting pipe is filled with 50cm of filler.
d, water distribution pipeline protection measures: and laying a layer of geotextile after the water distribution pipeline is installed. When the water distribution pipeline is installed, the upper layer of the pipeline is kept level with the filler, and the pipeline is prevented from being higher than the filler. When the planting soil is backfilled on the geotextile, a small three-horse vehicle is used, and the wooden mat track is gradually pushed, so that the vehicle is prevented from directly pressing the pipeline.
Step S45: backfilling planting soil; after the ecological filler is constructed according to the design, covering planting soil with the thickness of 20cm on the upper layer of the filler; removing impurities, garbage, brick and tile fragments, branches and the like before filling the planting soil; b, selecting pollution-free planting soil, and loading and transporting the soil by using an excavator or a loader during soil taking; c, during backfilling, backfilling from the end close to the water distribution channel to the far end in sequence, paving a steel plate and wood-plastic plate road in the pond, conveying the steel plate and wood-plastic plate road into the pond by adopting a small dump truck or a three-horse vehicle, and manually leveling; the thickness of the planting soil is controlled to be 20 cm;
step S46: planting and constructing aquatic plants and trees in tree pools in the subsurface wetland: the lowest temperature in winter of the vinpocetine is-20 degrees, so that overwintering of aquatic plants needs to be considered; the overwintering requirement can be met after the aquatic plants are planted for 2 months in the vigorous growth period, the vigorous growth period of the aquatic plants in the Changchun region is 4-9 months, and the time suitable for planting is 4-7 months, so that the aquatic plants are arranged to be planted in 2018 in 4-5 months according to actual conditions.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The subsurface flow wetland construction method is characterized by comprising the following steps:
carrying out impermeable membrane laying operation on an area to be constructed;
then fine sand laying operation is carried out;
backfilling the ecological materials to ensure that a packing layer is formed on the subsurface flow wetland;
constructing a water collecting pipe at the lower part of the packing layer of the subsurface flow wetland to perform drainage operation on the subsurface flow wetland; constructing a water distribution pipeline on the upper part of the packing layer of the subsurface flow wetland, and enabling water to flow into wetland packing downwards through uniform holes on the water distribution pipeline after the water flows through the water distribution pipeline;
backfilling planting soil, namely covering the upper layer of the filler with the planting soil with a preset thickness size to form a planting soil layer after the construction of the filler layer is finished;
and carrying out planting construction operation on aquatic plants and trees in the tree pool on a planting soil layer of the subsurface flow wetland.
2. The subsurface wetland construction method according to claim 1, wherein the predetermined thickness dimension is 20 cm.
3. The subsurface wetland construction method according to claim 2, further comprising performing construction protection operation on the anti-seepage membrane before the construction of the anti-seepage membrane laying operation on the area to be constructed;
a10 cm coarse sand protective layer was laid before the impermeable membrane was laid.
4. The subsurface wetland construction method according to claim 3, wherein in the impermeable membrane laying operation performed on the area to be constructed, the impermeable membrane laying operation performed on the area to be constructed specifically comprises the steps of;
the coiled membrane cloth is straightened and laid from one end of the underflow pool wall where the area to be constructed is located to the other end; reserving a 30-40cm crimp joint at the top of the tank, and reserving a 20cm lap joint between the adjacent impermeable membranes;
welding the adjacent overlapped impermeable films by using a hot melting machine, wherein the welding overlapping width of the adjacent impermeable films is 20 cm;
the anti-seepage film is well adhered to the wall of the undercurrent pool where the area to be constructed is located; after the anti-seepage film is adhered, the adhered part is pressed and fixed by a steel edge strip, and the steel edge strip is riveted on the wall of the undercurrent pool.
5. The subsurface wetland construction method according to claim 1, wherein the fine sand laying operation is carried out, and the method comprises the following steps:
screening large-particle stones and impurities from the fine sand transported to the construction site, and preventing the brick tiles with sharp edges from entering the fine sand; the precision of the fine sand is particles with the particle size of more than 0.075mm-0.085 mm;
the artificial uniform spreading is used at the bottom of the rammed undercurrent pool, and the thickness is kept at 15 cm.
6. The subsurface flow wetland construction method according to claim 5, wherein the ecological material backfilling operation is performed to ensure that the packing layer is formed on the subsurface flow wetland, and the method specifically comprises the following operation steps:
in order to ensure the protection of the impermeable film, a bamboo plywood is laid on the filler to be used as a temporary lane;
the filler transport vehicle can only carry out straight-forward and straight-back unloading operation at a constant speed when moving on the filler;
the height ratio of filler is higher than preset height by 5cm, prevents that the filler from sinking and causing the filler thickness not enough.
7. The subsurface flow wetland construction method according to claim 6, wherein a water collection pipe is constructed under the packing layer of the subsurface flow wetland to perform a drainage operation for the subsurface flow wetland; constructing a water distribution pipeline on the upper part of a packing layer of the subsurface flow wetland, and making water flow downwards flow into wetland packing in the construction process through uniform holes on the water distribution pipeline after the water flow passes through the water distribution pipeline;
the water collecting pipe is a drainage pipeline of the subsurface flow wetland, and a De110UPVC pipe is adopted as a water collecting main pipe of the water collecting pipe and is arranged in the subsurface flow wetland;
a De63UPVC pipe is adopted as a water collecting branch pipe of the water collecting pipe and is arranged in the undercurrent pool; the main water collecting pipe is connected and communicated with the branch water collecting pipe; uniformly arranging holes on each section of the water distribution branch pipe, wherein the distance between every two holes is 250mm, the aperture is 10mm, and the holes are uniformly arranged in a plum blossom shape;
a plurality of vent pipes are arranged, the vent pipes adopt De63UPVC, and the vent pipes are connected with the water collecting branch pipes in a tee joint mode.
8. The subsurface flow wetland construction method according to claim 7,
the water distribution pipeline is a water inlet distribution pipeline of the undercurrent pool, and a De110UPVC pipe is adopted as a main water distribution pipe of the water distribution pipeline and is arranged in the undercurrent pool;
a De63UPVC pipe is adopted as a water distribution branch pipe of the water distribution pipeline and is arranged in the undercurrent pool;
the water distribution branch pipes are uniformly provided with openings, the distance between the openings is 250mm, the aperture is 10mm, and the openings are uniformly arranged in a plum blossom shape.
9. The subsurface wetland construction method according to claim 8, further comprising the following steps before the impermeable membrane laying operation is performed on the area to be constructed;
performing a ditch slotting operation; clearing and compacting a filling area, and organizing a mechanical excavation ditch foundation, a tree pool foundation and a wooden trestle foundation;
basic processing operation; ensuring that the bearing capacity characteristic value of the bearing capacity of the floor bearing layer of the ditch foundation, the tree pool foundation and the wooden trestle foundation is 120 kPa;
concrete engineering construction operation; the concrete construction project comprises a diversion canal, a water distribution canal, a water collecting canal, a tree pool, a retaining wall and a wooden trestle foundation, wherein the construction operation forms the subsurface flow wetland of a region to be constructed.
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Cited By (1)
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| CN112850909A (en) * | 2021-03-01 | 2021-05-28 | 北京京水建设集团有限公司 | Constructed wetland filler construction method |
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