CN115369984A - Annular sponge seepage well and construction method thereof - Google Patents

Abstract

The invention discloses an annular sponge seepage well and a construction method thereof, and the annular sponge seepage well comprises a main well, auxiliary wells and a branched pipe network, wherein the auxiliary wells are annularly distributed around the main well, the branched pipe network is communicated with the main well and the auxiliary wells, the main well and the auxiliary wells are arranged at the same height, the auxiliary wells comprise a plurality of low-level wells, a plurality of high-level wells and an annular pipe network, the annular pipe network is connected with the low-level wells and the high-level wells in series, the low-level wells and the high-level wells are arranged in a one-to-one correspondence and adjacent equidistant mode, the low-level wells comprise upper wells and lower wells which are in butt joint and embedded in an up-down mode, and communicating pipes communicated with the upper wells and the lower wells, and the main well, the low-level wells and the high-level wells are sequentially put into use through the branched pipe network and the annular pipe network which are communicated with all parts under different rainfall quantities. The annular sponge seepage well can be assembled and put into use quickly through prefabrication and assembly, can meet the requirement of quickly absorbing different rainfall quantities, and greatly improves the regulation and storage capacity and the permeability of the seepage well.

Description

Annular sponge seepage well and construction method thereof

Technical Field

The invention relates to the field of sponge city construction, in particular to an annular sponge seepage well and a construction method thereof.

Background

In recent years, the construction of sponge cities has played a good effect on solving urban flood disasters. According to the construction requirements of sponge cities, china puts forward numerous novel infrastructures and construction processes in different construction fields, improves the traditional process, and is more suitable for the development of the construction industry in the new era. According to the sponge city, principles such as ecological priority and the like are followed, natural ways and artificial measures are combined, and water resource utilization and ecological environment protection are promoted to the maximum extent on the premise that flood disasters can be prevented.

In sponge city construction, because the permeability of soil is less for vertical direction water permeability receives the restriction, consequently oozes the setting of well, is favorable to eliminating fast or reducing surface ponding. The seepage well is a vertical underground drainage facility, which is a facility for rainwater to seep down through the well wall and the well bottom, and in order to increase the seepage effect, horizontal seepage and drainage pipes can be arranged around the seepage well, and gravels (fragments) can be laid around the seepage and drainage pipes. However, the traditional seepage wells are arranged at long distance intervals, so that land is wasted, or the seepage capability of the seepage wells is seriously weakened due to the close-distance series arrangement, so that the popularization and the application of the seepage wells are seriously influenced.

Disclosure of Invention

The invention provides an annular sponge seepage well, which can be prefabricated and assembled on site, is quickly assembled on site, adopts a mode that auxiliary wells consisting of low wells and high wells are arranged at equal intervals around the outer circumference of the main well, can meet the requirement of quickly absorbing different rainfall, greatly improves the regulation and permeability of the seepage well, solves the problems that the traditional seepage well is arranged at long distance intervals to waste land, and the seepage capacity of the seepage well is seriously weakened due to short-distance series arrangement, simultaneously increases the water storage function, is convenient for daily irrigation, can be used for municipal roads, parks and residential areas, and greatly reduces the water consumption cost.

In a first aspect of the present invention, there is provided an annular sponge seepage well, comprising: the system comprises a main well, auxiliary wells and a branch pipe network, wherein the auxiliary wells are annularly distributed around the main well;

the main well and the auxiliary well are arranged at the same height, and the main well comprises a water inlet and a water outlet;

the auxiliary well comprises a plurality of low wells, a plurality of high wells and an annular pipe network for connecting the low wells and the high wells in series, and the low wells and the high wells are arranged in a one-to-one correspondence and adjacent equidistant mode; the low well comprises a completely closed upper well and a lower well with an opening at the top, the bottom of the upper well is embedded with the lower well through the opening at the top of the lower well, a first communicating pipe and a second communicating pipe are arranged in the low well, a pipe end at one side of the first communicating pipe penetrates through the upper well and extends out of the outer side of the top of the low well, the first communicating pipe penetrates through the bottom of the upper well, and the other pipe end is positioned in the lower well; the second communicating pipe is arranged in the upper well, the upper pipe end of the second communicating pipe is communicated with the first communicating pipe, and the lower pipe end of the second communicating pipe is arranged above the bottom of the upper well; the annular pipe network comprises a plurality of arc-shaped branch pipes, pipe ends on two sides of each arc-shaped branch pipe are respectively communicated with the lower part of the lower well and the lower part of the high well which are adjacent to each other, and two connecting parts are arranged on the same horizontal plane;

the branch network includes first branch pipe of a plurality of and a plurality of second branch pipe, first branch pipe both sides pipe end respectively with upper well lateral wall lower part with main well lateral wall upper portion intercommunication, second branch pipe both sides pipe end respectively with upper well upper portion with main well lateral wall upper portion intercommunication, first branch pipe with the main well junction height is less than the second branch pipe with the main well junction height.

Furthermore, the main well, the high-position well, the side wall and the bottom of the lower well, the dendritic pipe network and the annular pipe network are densely distributed with water seepage holes.

Further, the diameter of the main well is 3-5 times of the diameter of the low-position well or the high-position well, and the distance between the main well and the auxiliary well is equal to the diameter of the main well multiplied by a coefficient of 0.1-0.3.

Further, the second communicating pipe is an inverted L-shaped pipe, the distance between a pipe end arranged above the bottom of the upper well and the bottom of the upper well is 3-5 cm, and the joint of the second communicating pipe and the first communicating pipe is close to the top of the upper well.

Furthermore, the first branch pipe is respectively communicated with the bottom of the side wall of the upper well and 2/3-3/4 of the height of the main well.

Furthermore, the second branch pipe is respectively communicated with the upper part of the side wall of the high-position well and the position 4/5-5/6 of the height of the main well.

Furthermore, the height of the water outlet of the main well is greater than the height of the water inlet of the main well, the height of the joint of the first branch pipe and the main well and the height of the joint of the second branch pipe and the main well.

Further, the main well and the auxiliary well are respectively paved with fillers at the outer periphery and the inner bottom of the well, and the particle size of the fillers is larger than the pore diameter of the water seepage hole.

Further, the packing is gravel packing.

The second aspect of the invention also provides a construction method for constructing and obtaining the annular sponge seepage well, which comprises the following steps:

the method comprises the following steps: selecting a seepage well construction area, and marking the construction positions of a main well and an auxiliary well according to design requirements;

step two: excavating a pit according to the mark;

step three: paving gravels at the bottom of the pot hole;

step four: vertically placing a main well and an auxiliary well at the bottom of the pit;

step five: the main well and the auxiliary well are connected through a pipeline, the pipeline forms a branch pipe network and a ring pipe network, and the upstream rainwater pipeline and the downstream rainwater pipeline are connected by using a pipeline;

step six: filling gravel layer by layer around and on the top of the seepage well, wherein the filling depth of the gravel is kept between 20 and 30cm each time, and compacting;

step seven: and backfilling and compacting the upper part of the seepage well by adopting the original soil, and finally completely covering the seepage well and gravel by using a soil layer.

Has the advantages that:

according to the technical scheme, the annular sponge seepage well and the construction method thereof are provided, wherein the sponge seepage well with the annular structure saves a large amount of land, solves the problem that the conventional seepage well is insufficient in regulation and permeability, is added with a water storage function, facilitates daily irrigation, greatly reduces water cost, and can be used for municipal roads, parks and residential areas. In addition, the main well and the auxiliary well can be prefabricated and assembled, the field is fast to assemble, the construction is simple and fast, the maintenance is time-saving and labor-saving, and the carbon emission is greatly reduced.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic plan view of an annular sponge seepage well in the embodiment of the application;

FIG. 2 is a cross-sectional view of a ring-shaped sponge seepage well symmetrical low well in the embodiment of the application;

FIG. 3 is a sectional view of a symmetrical elevated well of an annular sponge seepage well in the embodiment of the application;

FIG. 4 is a construction diagram of an annular sponge seepage well low well in the embodiment of the application;

FIG. 5 is a diagram of an annular sponge seepage well elevated well structure in the embodiment of the application.

In the figures, the reference symbols have the following meanings:

1-main well, 2-auxiliary well, 21-low well, 211-upper well, 212-lower well, 213-first communicating pipe, 214-second communicating pipe, 22-high well, 23-annular pipe network, 231-arc branch pipe, 3-dendritic pipe network, 31-first branch pipe, 32-second branch pipe, 4-seepage hole and 5-filler.

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Based on the problems that in the prior art, when the traditional seepage well is actually put into use, the land is wasted due to overlarge arrangement distance, or the seepage capability of the traditional seepage well is seriously weakened due to too small distance, so that the popularization and the application of the seepage well are seriously influenced; the invention aims to provide an annular sponge seepage well which has good regulation and storage and permeability and can meet the requirement of rapid rainwater absorption under different rainfall amounts while being reasonably arranged by effectively utilizing land resources and a construction method thereof.

The present invention will be described in detail with reference to the embodiments shown in the drawings.

With reference to the annular sponge seepage well shown in fig. 1 to 5, the annular sponge seepage well comprises a main well 1, auxiliary wells 2 annularly distributed around the main well 1, and a branch pipe network 3 communicating the main well 1 and the auxiliary wells 2;

the main well 1 and the auxiliary well 2 are arranged at the same height, the main well 1 comprises a water inlet and a water outlet, the water inlet is used as a way for rainwater to enter the seepage well, and the water outlet is communicated with a municipal rainwater pipe network to be used as a rapid rainwater discharge channel;

the auxiliary well 2 comprises a plurality of low-position wells 21, a plurality of high-position wells 22 and an annular pipe network 23 which is connected with the low-position wells 21 and the high-position wells 22 in series, and the low-position wells 21 and the high-position wells 22 are arranged in a one-to-one correspondence and adjacent equidistant manner; the lower well 21 comprises an upper well 211 and a lower well 212, wherein the upper well 211 is completely closed, the top of the lower well 212 is opened, the bottom of the upper well 211 is embedded with the lower well 212 through the opening at the top of the lower well 212, a first communicating pipe 213 and a second communicating pipe 214 are arranged in the lower well 21, one pipe end of the first communicating pipe 213 penetrates through the upper well 211 and extends out of the top of the lower well 21, the first communicating pipe 213 penetrates through the bottom of the upper well 211, and the other pipe end is positioned in the lower well 212; the second communicating pipe 214 is arranged in the upper well 211, the upper pipe end of the second communicating pipe 214 is communicated with the first communicating pipe 213, and the lower pipe end of the second communicating pipe 214 is arranged above the bottom of the upper well 211; the annular pipe network 23 comprises a plurality of arc-shaped branch pipes 231, pipe ends on two sides of each arc-shaped branch pipe 231 are respectively communicated with the lower parts of the adjacent lower wells 212 and the lower parts of the adjacent high wells 22, and the two joints are arranged on the same horizontal plane;

dendritic pipe network 3 includes first branch pipe 31 of a plurality of and a plurality of second branch pipe 32, first branch pipe 31 both sides pipe end respectively with upper well 211 lateral wall lower part with 1 lateral wall upper portion intercommunication of main shaft, second branch pipe 32 both sides pipe end respectively with high-order well 22 upper portion with 1 lateral wall upper portion intercommunication of main shaft, first branch pipe 31 with 1 junction height of main shaft is less than second branch pipe 32 with 1 junction height of main shaft.

When raining, the flowing way of rainwater in the annular sponge seepage well can be divided into three ways: when the rainfall is small, rainwater enters the main well 1 through the water inlet of the main well and directly permeates into the surrounding soil through the main well 1; when the rainfall is large, the rainfall entering the main well 1 exceeds the digestion capacity of the main well, rainwater enters the auxiliary well 2 through the branch pipe network 3, and finally the main well 1 and the auxiliary well 2 jointly undertake digestion of the rainwater; and thirdly, when the rainfall exceeds the absorption capacity of the main well 1 and the auxiliary well 2, the rainwater accumulated in the well is quickly discharged into a municipal rainwater pipe network through a water outlet on the main well 1.

Considering that the annular sponge seepage well has strong regulation and storage capacity, all the components and the joints of the annular sponge seepage well have certain size ranges. Wherein, the main well 1 plays a role of mainly absorbing rainwater, and the diameter of the main well is 3 to 5 times of that of the low-level well 21 or the high-level well 22; the distance between the main well 1 and the auxiliary well 2 is equal to the diameter of the main well 1 multiplied by a coefficient of 0.1-0.3; in addition, as shown in fig. 4, the second communication pipe 214 is an inverted L-shaped pipe, the distance between the pipe end above the bottom of the upper well 211 and the bottom of the upper well 211 is 3 to 5cm, the connection position of the second communication pipe 214 and the first communication pipe 213 is close to the top of the upper well 211, and during use, the first communication pipe 213 and the second communication pipe 214 not only play a role in communicating the upper well 211 with the lower well 212, but also can be used as a water drawing pipe to draw rainwater accumulated in the upper well 211 for daily irrigation; the first branch pipes 31 are respectively communicated with the bottom of the side wall of the upper well 211 and 2/3-3/4 of the height of the main well 1, the second branch pipes 32 are respectively communicated with the upper part of the side wall of the upper well 22 and 4/5-5/6 of the height of the main well 1, and the height of the water outlet of the main well 1 is larger than the height of the water inlet of the main well 1, the height of the joint of the first branch pipes 31 and the main well 1 and the height of the joint of the second branch pipes 32 and the main well 1. During construction, the specific dimensions of the components and joints of the annular sponge seepage well can be determined by those skilled in the art by considering the above mentioned dimensional ranges according to actual construction conditions and actual requirements.

In specific implementation, in order to achieve better storage regulation and permeation effects of the annular sponge seepage well, under ideal construction conditions, the diameter of the main well 1 is 5 times that of the low-level well 21 or the high-level well 22; the distance between the main well 1 and the auxiliary well 2 is equal to the diameter of the main well 1 multiplied by a factor of 0.3; the distance between the pipe end of the second communicating pipe 214 arranged above the bottom of the upper well 211 and the bottom of the upper well 211 is 5cm, meanwhile, the joint of the second communicating pipe 214 and the first communicating pipe 213 is as close as possible to the top of the upper well 211, and the first branch pipe 31 is respectively communicated with the bottom of the side wall of the upper well 211 and the 3/4 height of the main well 1, so as to ensure that the low well 21 provides enough space for water storage; the second branch pipe 32 is respectively communicated with the upper part of the side wall of the high well 22 and the 5/6 height of the main well 1, wherein the joint of the first branch pipe 31 and the main well 1 and the joint of the second branch pipe 32 and the main well 1 have a certain height difference, so that the low well 21 and the high well 22 are activated in steps to correspond to different rainfall stages.

As shown in fig. 2 and 3, in order to enable rainwater to be discharged through the water outlet of the main well 1 when the regulation and infiltration capacity of the annular sponge infiltration well is saturated, the height of the water outlet of the main well 1 is greater than the height of the water inlet of the main well 1, the height of the joint of the first branch pipe 31 and the main well 1, and the height of the joint of the second branch pipe 32 and the main well 1. When the annular sponge seepage well in the embodiment is actually put into use, other rainwater treatment facilities such as a rainwater collection well are usually arranged on the periphery of the annular sponge seepage well. In order to avoid the phenomenon that rainwater in the rainwater collecting wells adjacent to the upstream cannot be smoothly discharged, the water outlet of the main well 1 is not higher than the inner bottom of the water outlet of the rainwater collecting well adjacent to the upstream.

Traditional seepage wells utilize the natural water seepage law to lead surface water and upper groundwater to deeper underground layers by digging vertical holes in the underground layers. Compared with the traditional seepage well, the annular sponge seepage well in the embodiment has the advantages that the main well 1, the high-position well 22, the side wall and the bottom of the lower well 212, the branched pipe network 3 and the annular pipe network 23 are all densely distributed with the seepage holes 4, so that the annular sponge seepage well not only has the drainage and seepage functions of the traditional seepage well, but also can realize the seepage when rainwater flows or accumulates in the whole device.

As shown in fig. 1, the main well 1 and the auxiliary well 2 are provided with fillers 5 at the outer periphery and the inner bottom, and the fillers 5 form a transition structure between the annular sponge seepage well and the peripheral soil layer, so that the regulation and storage space and the infiltration of the annular sponge seepage well on rainwater are further improved. It should be noted that when the filler 5 is selected, the particle diameter of the filler is larger than the pore diameter of the water seepage hole 4, so as to prevent the filler 5 from blocking the water seepage hole 4 during the use process and weakening the permeability of the annular sponge seepage well. In practical application, cheap and easily available gravel can be selected as the packing 5, wherein the following principles should be followed when selecting the gravel: the backfilling gravel is relatively clean, so that slurry is prevented from blocking holes of the seepage well and polluting the inside of the seepage well; gravel mixed with mortar cannot be backfilled, so that the mortar is prevented from being hardened and the permeability is damaged; the particle size of the gravel meets the design requirement and is relatively uniform, and the particle size is not smaller than the open pores of the seepage well so as to prevent the gravel from falling into the seepage well through the pores; the gravel must not have excessive edges to prevent damage to the wellbore and other construction materials such as geotextiles.

In addition to the regulation and permeation capabilities, the annular sponge seepage well in this embodiment should have sufficient compressive strength for selection of the main well 1 and the auxiliary well 2, so as to prolong the service life of the annular sponge seepage well. In view of the different practical requirements of use, the following points can be followed in the selection of wellbore materials for the main well 1 and the auxiliary well 2: in the greening area with low load, plastic and glass fiber reinforced plastic finished products can be infiltrated into the shaft; in areas with higher load, such as roads, squares and the like, prefabricated finished product seepage well shafts, such as reinforced concrete, silica sand and the like, can be adopted, wherein the silica sand well shaft can be perforated, and rainwater can permeate outwards through the pores of the well body; and in the case of lacking of finished products, the shaft can be made by punching by materials such as a rainwater barrel, a rainwater pipe and the like.

The embodiment also provides a construction method of the annular sponge seepage well related to the structure, which comprises the following steps:

the method comprises the following steps: selecting a seepage well construction area, and marking the construction positions of a main well and an auxiliary well according to design requirements; in the selection of the seepage well position, an area which is convenient to excavate, is connected with a municipal pipe network and keeps a horizontal distance of more than 3m with a building (structure) and a road foundation is selected for construction so as to prevent rainwater from infiltrating to damage the foundation; if the requirement of the horizontal distance cannot be met, measures such as a lateral impermeable film and the like are required to prevent secondary disasters;

step two: excavating a pit according to the mark; when the construction operable space is large, an excavator can be used for construction, when the construction space is limited, a small spiral drilling machine or manual excavation can be used, and meanwhile, the interference to the construction surrounding environment is reduced; wherein, the manual excavation can form a certain vertical gradient during construction, which is the most convenient construction operation;

step three: paving gravels at the bottom of the pot hole; after the gravel which is selected and meets the use requirement is poured, the stone layer is ensured to be flat, and the thickness of the gravel meets the design requirement;

step four: vertically placing a main well and an auxiliary well at the bottom of the pit; during construction, a gradienter can be adopted to measure the inclination of the well body, so that the well body is ensured to be vertically arranged, and the uniform rainwater permeation direction is ensured; when a light plastic or glass fiber reinforced plastic shaft is adopted, the shaft can be directly placed manually; when heavy shafts such as concrete and silica sand are adopted, a hoisting mode is adopted;

step five: the main well and the auxiliary well are connected by a pipeline, the pipeline forms a branch pipe network and a ring pipe network, and the upstream rainwater pipeline and the downstream rainwater pipeline are connected by a pipeline; the connection and installation of the upstream rainwater pipeline and the downstream rainwater pipeline are synchronously performed with the arrangement and installation of the seepage well, when the construction of the upstream rainwater pipeline and the downstream rainwater pipeline cannot be synchronously performed, the rainwater pipelines can be connected according to corresponding angles (corresponding to different gradients) before the installation of the seepage well, and can also be installed in a sleeving manner after the installation of the seepage well is completed;

step six: gravel is poured into the peripheral and top part layers of the seepage well in multiple times for packing, the pouring depth of the gravel is kept between 20 and 30cm each time, the gravel is compacted, and a certain distance is reserved between the compacted gravel layer and the peripheral soil layer to reserve an earth covering position;

step seven: backfilling and compacting the upper part of the seepage well by adopting original soil, and finally completely covering the seepage well and gravel by a soil layer; the elevation of the compacted soil layer is smooth connection between the soil layer and the surrounding field after plants such as turf are planted on the soil layer, the backfilled soil layer cannot protrude out of the ground, and meanwhile, the inspection hole of the seepage well is exposed out of the ground, so that later inspection is facilitated. After the construction is finished, the redundant earthwork is intensively cleaned and transported without damaging the surrounding field.

The operation of the annular sponge seepage well in the embodiment shown in fig. 1 to 5 is described in detail as follows:

when the rainfall is small, the collected rainwater enters the main well 1 from the water inlet and permeates into the peripheral soil through the seepage holes on the bottom and the peripheral side walls of the main well 1, and at the moment, the main well 1 can absorb all the rainwater;

as the rainfall increases, the rainwater inflow speed in the main well 1 is greater than the infiltration rate, the main well 1 cannot immediately absorb all the rainwater, the rainwater starts to accumulate inside the main well 1, when the water level gradually rises to a lower position, that is, the connection and communication position between the low well 21 and the main well 1, the rainwater enters the upper well 211 in the low well 21 through the first branch pipe 31 in the dendritic pipe network 3 and accumulates in the upper well to share the rainwater absorption pressure of the main well 1, as the accumulation amount of the rainwater in the upper well 211 increases, and the water level exceeds the connection and communication position between the first communication pipe 213 and the second communication pipe 214, the rainwater enters the lower well through the second communication pipe 214 and the first communication pipe 213, and permeates into the surrounding soil through the infiltration holes 4 at the bottom of the lower well 212 and the surrounding side walls, and part of the rainwater can be uniformly distributed to the adjacent high wells 22 through the annular pipe network 23, so as to accelerate the infiltration;

when the rainfall is increased continuously, the inflow speed of the rainwater in the lower well 212 is greater than the penetration rate, the water level in the lower well 212 rises rapidly until the lower well is full, at this time, the lower well 21 cannot bear the redundant rainwater, the water level in the main well 1 rises continuously until a higher position, namely a joint and communication position of the high well 22 and the main well 1 is reached, the rainwater enters the high well 22 through the second branch pipes 32 in the branched pipe network 3 and permeates into the surrounding soil through the seepage holes 4 in the bottom of the high well 22 and the surrounding side walls;

when rainstorm occurs, the inflow velocity of rainwater in the high level well 22 is greater than the penetration rate, and the main well 1, the low level well 21 and the high level well 22 are all filled with rainwater, so that excessive rainwater can be rapidly discharged through the water outlet on the main well 1 and enter a municipal rainwater network.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (10)

1. An annular sponge seepage well, comprising: the system comprises a main well (1), auxiliary wells (2) annularly distributed around the main well (1) and a dendritic pipe network (3) for communicating the main well (1) and the auxiliary wells (2);

the main well (1) and the auxiliary well (2) are arranged at the same height, and the main well (1) comprises a water inlet and a water outlet;

the auxiliary well (2) comprises a plurality of low-position wells (21), a plurality of high-position wells (22) and an annular pipe network (23) which is connected with the low-position wells (21) and the high-position wells (22) in series, and the low-position wells (21) and the high-position wells (22) are arranged in a one-to-one correspondence and adjacent equidistant mode; the lower well (21) comprises a completely closed upper well (211) and a lower well (212) with an open top, the bottom of the upper well (211) is embedded with the lower well (212) through the open top of the lower well (212), a first communicating pipe (213) and a second communicating pipe (214) are arranged in the lower well (21), a pipe end on one side of the first communicating pipe (213) penetrates through the upper well (211) and extends out of the top of the lower well (21), the first communicating pipe (213) penetrates through the bottom of the upper well (211), and the other pipe end is positioned in the lower well (212); the second communication pipe (214) is arranged in the upper well (211), the upper pipe end of the second communication pipe (214) is communicated with the first communication pipe (213), and the lower pipe end of the second communication pipe (214) is arranged above the bottom of the upper well (211); the annular pipe network (23) comprises a plurality of arc-shaped branch pipes (231), pipe ends on two sides of the arc-shaped branch pipes (231) are respectively communicated with the lower parts of the adjacent lower wells (212) and the lower parts of the adjacent upper wells (22), and joints of the two parts are arranged on the same horizontal plane;

dendritic pipe network (3) include a plurality of first branch pipe (31) and a plurality of second branch pipe (32), first branch pipe (31) both sides pipe end respectively with superior well (211) lateral wall lower part with main well (1) lateral wall upper portion intercommunication, second branch pipe (32) both sides pipe end respectively with high-order well (22) upper portion with main well (1) lateral wall upper portion intercommunication, first branch pipe (31) with main well (1) junction height is less than second branch pipe (32) with main well (1) junction height.

2. The annular sponge seepage well of claim 1, wherein: the main well (1), the high-position well (22), the side wall and the bottom of the lower well (212), the dendritic pipe network (3) and the annular pipe network (23) are densely distributed with water seepage holes (4).

3. The annular sponge seepage well of claim 1, wherein: the diameter of the main well (1) is 3-5 times of the diameter of the low-position well (21) or the high-position well (22), and the distance between the main well (1) and the auxiliary well (2) is equal to the diameter of the main well (1) multiplied by a coefficient of 0.1-0.3.

4. The annular sponge seepage well of claim 1, wherein: the second communicating pipe (214) is an inverted L-shaped pipe, the distance between a pipe end arranged above the bottom of the upper well (211) and the bottom of the upper well (211) is 3-5 cm, and the joint of the second communicating pipe (214) and the first communicating pipe (213) is close to the top of the upper well (211).

5. The annular sponge seepage well of claim 1, wherein: the first branch pipe (31) is respectively communicated with the bottom of the side wall of the upper well (211) and the position 2/3-3/4 of the height of the main well (1).

6. The annular sponge seepage well of claim 1, wherein: the second branch pipe (32) is respectively communicated with the upper part of the side wall of the high well (22) and the position of 4/5-5/6 of the height of the main well (1).

7. The annular sponge seepage well of claim 1, wherein: the height of the water outlet of the main well (1) is larger than the height of the water inlet of the main well (1), the height of the joint of the first branch pipe (31) and the main well (1) and the height of the joint of the second branch pipe (32) and the main well (1).

8. The annular sponge seepage well of claim 2, wherein: and the main well (1) and the auxiliary well (2) are respectively paved with fillers (5) at the outer periphery and the inner bottom of the well, and the particle size of the fillers (5) is larger than the aperture of the water seepage hole (4).

9. The annular sponge seepage well of claim 8, wherein: the packing (5) is gravel packing.

10. The construction method of the annular sponge seepage well is characterized in that the annular sponge seepage well as any one of claims 1 to 9 is constructed and obtained, and the construction method comprises the following steps:

the method comprises the following steps: selecting a seepage well construction area, and marking the construction positions of the main well (1) and the auxiliary well (2) according to design requirements;

step two: excavating a pit according to the mark;

step three: paving gravels at the bottom of the pot hole;

step four: vertically placing a main well (1) and an auxiliary well (2) at the bottom of the pit hole;

step five: the main well (1) and the auxiliary well (2) are connected through pipelines, the pipelines form a branch pipe network (3) and a ring pipe network (23), and the pipelines are used for connecting upstream and downstream rainwater pipelines;

step six: filling gravel layer by layer around and on the top of the seepage well, wherein the filling depth of the gravel is kept between 20 and 30cm each time, and compacting;

step seven: and backfilling and compacting the raw soil above the seepage well, and finally completely covering the seepage well and gravel with a soil layer.

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