CN115369984B - Annular sponge seepage well and construction method thereof - Google Patents

Abstract

The application discloses an annular sponge seepage well and a construction method thereof, wherein the annular sponge seepage well comprises a main well, auxiliary wells which are annularly distributed around the main well and a branch pipe network which is communicated with the main well and the auxiliary wells, the main well and the auxiliary wells are arranged at equal heights, the auxiliary wells comprise a plurality of low-level wells, a plurality of high-level wells and an annular pipe network which is connected with the low-level wells and the high-level wells in series, the low-level wells and the high-level wells are correspondingly arranged at equal intervals one by one, the low-level wells comprise upper wells, lower wells and communicating pipes which are in butt joint and embedded up and down, and the main well, the low-level wells and the high-level wells are sequentially put into use through the branch pipe network and the annular pipe network which are communicated with each part under different rainfall. The annular sponge seepage well can be quickly assembled and put into use through prefabrication assembly, can meet the requirement of quick absorption of different rainfall, and greatly improves the storage and permeation capacity of the seepage well.

Description

Annular sponge seepage well and construction method thereof

Technical Field

The application 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 a good effect on solving urban flood disasters. According to the construction requirements of sponge cities, a plurality of novel infrastructures and construction processes are provided in different construction fields in China, the traditional process is improved, and the method is more suitable for the development of new times of construction industry. The sponge city proposes to follow the principles of ecological priority and the like, combines natural approaches with manual measures, and can ensure that water resource utilization and ecological environment protection are promoted to the maximum extent on the premise of preventing flood disasters.

In the sponge city construction, because the permeability of soil is less for vertical direction water permeability is restricted, consequently the setting of seepage well is favorable to eliminating or reducing the surface ponding fast. The seepage well is a vertical underground drainage facility, which is a facility for carrying out rainwater seepage through a well wall and a well bottom, wherein in order to increase the seepage effect, horizontal seepage pipes can be arranged around the seepage well, and gravel (crushed) can be paved around the seepage pipes. However, the popularity and application of a conventional seepage well are seriously affected by either wasting the land due to the long distance spacing arrangement or by the short distance series arrangement, which seriously weakens the seepage capability of the seepage well.

Disclosure of Invention

The application provides a ring-shaped sponge seepage well, which can be prefabricated and assembled in situ, is quickly assembled in situ, adopts a mode that auxiliary wells consisting of low-level wells and high-level wells are equidistantly arranged around the circumference of the outer side of the main well, can meet the requirement of quick absorption of different rainfall, greatly improves the regulation, storage and permeability of the seepage well, solves the problems that the traditional seepage well is arranged at long distance intervals so as to waste land, the seepage capacity of the seepage well is seriously weakened by short-distance serial arrangement, simultaneously increases the water storage function, is convenient for daily irrigation, can be used for municipal roads, parks, gardens and residential areas, and greatly reduces the water cost.

A first aspect of the present application provides a ring-shaped sponge diffusion well comprising: the main well, the auxiliary wells which are annularly distributed around the main well and the dendritic pipe network which is communicated with the main well and the auxiliary wells;

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 wells comprise a plurality of low-level wells, a plurality of high-level wells and a ring pipe network connected with the low-level wells and the high-level wells in series, wherein the low-level wells and the high-level wells are arranged in one-to-one correspondence, adjacent and equidistant; the lower 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 lower well, one pipe end of the first communicating pipe penetrates through the upper well and extends out of the top of the lower well, and the first communicating pipe penetrates through the bottom of the upper well and the other pipe end of the first communicating pipe 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 two side pipe ends of the arc-shaped branch pipes are respectively communicated with the lower well lower part and the upper well lower part which are adjacent, and the joints of the two positions are arranged on the same horizontal plane;

the branch pipe network comprises a plurality of first branch pipes and a plurality of second branch pipes, wherein pipe ends on two sides of the first branch pipes are respectively communicated with the lower part of the side wall of the upper well and the upper part of the side wall of the main well, pipe ends on two sides of the second branch pipes are respectively communicated with the upper part of the upper well and the upper part of the side wall of the main well, and the height of the junction between the first branch pipes and the main well is smaller than that between the second branch pipes and the junction between the main well.

Furthermore, the main well, the high-level 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-level well or the high-level 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 the pipe end arranged above the upper well bottom and the upper well bottom is 3-5 cm, and the joint of the second communicating pipe and the first communicating pipe is close to the upper well top.

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

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

Further, the height of the water outlet of the main well is larger 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.

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

Further, the packing is a gravel packing.

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

step one: selecting a seepage well construction area, and marking the construction positions of a main well and a secondary well according to design requirements;

step two: digging pits according to the marks;

step three: paving gravel at the bottom of the pit;

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

step five: the main well and the auxiliary well are connected through pipelines, the pipelines form a dendritic pipe network and an annular pipe network, and the pipelines are used for connecting an upstream rainwater pipeline and a downstream rainwater pipeline;

step six: layering and pouring gravel into the periphery and the top of a seepage well in batches for packing, and keeping the pouring depth of the gravel at 20-30 cm each time and compacting;

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

The beneficial effects are that:

according to the technical scheme, the annular sponge seepage well and the construction method thereof are provided, wherein the annular sponge seepage well saves a large amount of land, solves the problems of insufficient regulation and seepage capabilities of the traditional seepage well, increases the water storage function, facilitates daily irrigation, greatly reduces the 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 in situ, the construction is simple and quick, 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, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.

The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the application, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the application.

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 application will now be described, by way of example, with reference to the accompanying drawings, in which:

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

FIG. 2 is a cross-sectional view of a symmetrical low-level well of an annular sponge seepage well in an embodiment of the present application;

FIG. 3 is a cross-sectional view of a symmetrical high-level well of an annular sponge seepage well in an embodiment of the present application;

FIG. 4 is a schematic diagram of a low level well construction of an annular sponge seepage well in accordance with an embodiment of the present application;

FIG. 5 is a schematic diagram of a high-level well construction of an annular sponge seepage well in an embodiment of the present application.

In the drawings, the meanings of the reference numerals are as follows:

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

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present application more clear, the technical solution of the present application will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.

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 application 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 the land is wasted due to overlarge arrangement space or the permeability of the traditional seepage well is seriously weakened due to overlarge space when the traditional seepage well is actually put into use in the prior art, the popularization and the application of the seepage well are seriously influenced; the application aims to provide a ring-shaped sponge seepage well which has good regulation, storage and seepage capabilities and can meet the requirement of rapid rainwater absorption under different rainfall capacities by effectively utilizing land resources for reasonable arrangement and a construction method thereof.

The annular sponge seepage well and the construction method thereof are further specifically described below with reference to the embodiment shown in the drawings.

The annular sponge seepage well is shown in combination with figures 1-5, and comprises a main well 1, auxiliary wells 2 which are annularly distributed around the main well 1, and a dendritic pipe network 3 which is communicated with 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 path 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-level wells 21, a plurality of high-level wells 22 and a ring pipe network 23 which connects the low-level wells 21 and the high-level wells 22 in series, wherein the plurality of low-level wells 21 and the plurality of high-level wells 22 are arranged in one-to-one correspondence, adjacent and equidistant; the lower well 21 comprises a completely closed upper well 211 and a lower well 212 with an opening at the top, wherein 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, and 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 disposed in the upper well 211, an upper pipe end of the second communicating pipe 214 is communicated with the first communicating pipe 213, and a lower pipe end of the second communicating pipe 214 is disposed above the bottom of the upper well 211; the annular pipe network 23 comprises a plurality of arc-shaped branch pipes 231, the pipe ends at two sides of the arc-shaped branch pipes 231 are respectively communicated with the lower part of the lower well 212 and the lower part of the upper well 22 which are adjacent, and the two joints are arranged on the same horizontal plane;

the branch pipe network 3 comprises a plurality of first branch pipes 31 and a plurality of second branch pipes 32, the pipe ends on two sides of the first branch pipes 31 are respectively communicated with the lower part of the side wall of the upper well 211 and the upper part of the side wall of the main well 1, the pipe ends on two sides of the second branch pipes 32 are respectively communicated with the upper part of the upper well 22 and the upper part of the side wall of the main well 1, and the height of the joint of the first branch pipes 31 and the main well 1 is smaller than that of the joint of the second branch pipes 32 and the main well 1.

During rainfall, the flow path of rainwater in the annular sponge seepage well can be divided into three types: firstly, when the rainfall is smaller, rainwater enters the main well 1 through a water inlet of the main well 1 and directly permeates into the surrounding soil through the main well 1; secondly, when the rainfall is large, the rainfall entering the main well 1 exceeds the digestion capacity of the main well, the rainwater enters the auxiliary well 2 through the dendritic pipe network 3, and finally the main well 1 and the auxiliary well 2 jointly bear the digestion of the rainwater; and thirdly, when the rainfall exceeds the digestion capacity of the main well 1 and the auxiliary well 2, the rainwater accumulated in the well is rapidly discharged into a municipal rainwater pipe network through a water outlet on the main well 1.

Considering that the annular sponge seepage well has stronger regulation and storage capacity, each component part of the annular sponge seepage well and the connecting part thereof have a certain size range. Wherein the main well 1 plays a main role of absorbing rainwater, and the diameter of the main well is 3-5 times of that of the low well 21 or the high 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 communicating pipe 214 is an inverted L pipe, the distance between the pipe end above the bottom of the upper well 211 and the bottom of the upper well 211 is 3-5 cm, the connection between the second communicating pipe 214 and the first communicating pipe 213 is close to the top of the upper well 211, and in use, the first communicating pipe 213 and the second communicating pipe 214 serve as a water drawing pipe for drawing rainwater accumulated in the upper well 211 as daily irrigation water in addition to the function of communicating the upper well 211 and the lower well 212; the first branch pipe 31 is respectively communicated with the bottom of the side wall of the upper well 211 and the 2/3-3/4 height of the main well 1, the second branch pipe 32 is respectively communicated with the upper part of the side wall of the upper well 22 and the 4/5-5/6 height of the main well 1, and 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. In construction, the specific dimensions of the various components of the annular sponge seepage well and the joints thereof can be determined by those skilled in the art in combination with the actual construction conditions and actual requirements and with reference to the above-mentioned size ranges.

In the concrete implementation, in order to achieve better regulation, storage and permeation effects of the annular sponge seepage well, under ideal construction conditions, the diameter of the main well 1 is 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 factor of 0.3; the distance between the pipe end above the bottom of the upper well 211 and the bottom of the upper well 211 on the second communicating pipe 214 is 5cm, meanwhile, the connection between 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 sidewall of the upper well 211 and the 3/4 height of the main well 1, so as to ensure that the lower 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-level 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-level well 21 and the high-level well 22 are enabled step by step 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 permeation capacity of the annular sponge seepage well is saturated, the height of the water outlet of the main well 1 is greater than that of the water inlet of the main well 1, the height of the junction between the first branch pipe 31 and the main well 1 and the height of the junction between the second branch pipe 32 and the main well 1. When the annular sponge seepage well in the embodiment is put into practical use, other rainwater treatment facilities such as a rainwater collecting well and the like are also arranged on the periphery of the annular sponge seepage well. In order to avoid that rainwater in the rainwater collecting well adjacent to the upstream cannot be smoothly discharged, the water outlet of the main well 1 is not higher than the water outlet inner bottom of the rainwater collecting well adjacent to the upstream.

The traditional seepage well utilizes the natural seepage law, and ground water and upper groundwater are led to a deeper underground layer by cutting vertical holes in the stratum. Compared with the traditional seepage well, the annular sponge seepage well in the embodiment has the advantages that the seepage holes 4 are densely distributed on the side wall and the bottom of the main well 1, the side wall and the bottom of the lower well 212, the dendritic pipe network 3 and the annular pipe network 23, so that the annular sponge seepage well has drainage and seepage functions of the traditional seepage well, and can realize seepage when rainwater flows or accumulates in the whole device.

As shown in fig. 1, the outer periphery and the inner bottom of the main well 1 and the auxiliary well 2 are both paved with filler 5, and the filler 5 forms a transition structure between the annular sponge seepage well and the peripheral soil layer, so that the regulation and storage space and the seepage effect of the annular sponge seepage well on rainwater are further improved. It should be noted that, when the filler 5 is selected, its particle size should be larger than the pore size of the water seepage hole 4, so as to prevent the filler 5 from blocking the water seepage hole 4 during use and weakening the permeability of the annular sponge seepage well. In practical construction, the packing 5 can be selected from low-cost and easily available gravels, wherein the following principles are adopted when the gravels are selected: the backfill gravel should be relatively clean, so as to prevent mud from blocking seepage holes and polluting the inside of the seepage well; gravel mixed with mortar cannot be backfilled, so that the mortar in the gravel cannot be hardened, and the permeability is damaged; the particle size of the gravel accords with the design requirement, is relatively uniform, and is not smaller than the perforated holes of the seepage well so as to prevent the gravel from falling into the seepage well through the holes; the gravel must not have excessive corners to prevent damage to the wellbore and other construction materials such as geotextiles by the corners.

In this embodiment, besides the storage and permeation capabilities, the main well 1 and the auxiliary well 2 should be selected with sufficient compressive strength, so as to prolong the service life of the annular sponge seepage well. Taking into account the different practical demands, the following points can be followed in the choice of wellbore materials for the main well 1 and the auxiliary well 2: in the greening area with low load, a plastic and glass fiber reinforced plastic finished product seepage shaft can be adopted; in areas with higher loads 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 shafts can be free from holes, and rainwater can permeate outwards through the holes of the well bodies; under the condition of lacking a finished product, a self-made shaft can be perforated by adopting materials such as a rainwater cylinder, a rainwater pipe and the like.

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

step one: selecting a seepage well construction area, and marking the construction positions of a main well and a secondary well according to design requirements; in the aspect of the selection of the seepage well position, an area which is convenient to excavate and connect with 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 the seepage of rain water from damaging the foundation; if the requirements of the horizontal distance cannot be met, measures such as a lateral seepage-proofing film should be arranged to prevent secondary disasters;

step two: digging pits according to the marks; when the construction operable space is larger, the excavator can be used for construction, and when the construction space is limited, a small spiral drilling machine or a manual work can be used for excavation, and meanwhile, the interference to the surrounding environment of construction is reduced; wherein, the manual excavation can form a certain vertical gradient during construction, which is the most convenient construction operation;

step three: paving gravel at the bottom of the pit; the gravel which is selected and meets the use requirement is required to ensure the flatness of the stone layer after being poured, and the thickness of the gravel is required to meet the design requirement;

step four: vertically placing a main well and a secondary well at the bottom of the pit; during construction, the inclination of the well body can be measured by adopting a level gauge, so that the well body is ensured to be vertically placed, and the rainwater permeation direction is ensured to be uniform; when the light plastic and glass fiber reinforced plastic shaft is adopted, the light plastic and glass fiber reinforced plastic shaft can be directly placed manually; when a heavy shaft such as concrete, silica sand and the like is adopted, a hoisting mode is adopted;

step five: the main well and the auxiliary well are connected by using a pipeline, the pipeline forms a dendritic pipe network and an annular pipe network, and an upstream rainwater pipeline and a downstream rainwater pipeline are connected by using the pipeline; the connection and installation of the upstream and downstream rainwater pipelines are synchronous with the arrangement and installation of the seepage well, when the construction of the upstream and downstream rainwater pipelines cannot be carried out simultaneously, the rainwater pipelines can be connected according to corresponding angles (corresponding to different slopes) before the seepage well is installed, and the rainwater pipelines can also be installed in a sleeving manner after the seepage well is installed;

step six: layering and pouring gravels into the periphery and the top of the seepage well for stacking, wherein the pouring depth of the gravels is kept at 20-30 cm each time, compacting is carried out, and a certain distance is reserved between the upper part of the compacted gravels and the peripheral soil layer so as to reserve a soil 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 considered that the soil layer is smoothly connected with surrounding sites after plants such as turfs are planted on the soil layer, the backfilled soil layer cannot protrude out of the ground, and meanwhile, an inspection opening of the seepage well is exposed out of the ground, so that later inspection is facilitated. After the construction is finished, the redundant earthwork should be concentrated and cleared, and the surrounding sites should not be destroyed.

The following describes in detail the annular sponge seepage well in the embodiment shown in fig. 1 to 5, the working procedure of which is as follows:

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

with the increase of the rainfall, the inflow speed of the rainwater in the main well 1 is greater than the permeation speed, the main well 1 cannot immediately absorb all the rainwater, the rainwater starts to accumulate in the main well 1, when the water level gradually rises to a lower position, namely, the junction and communication between the lower well 21 and the main well 1, the rainwater enters the upper well 211 in the lower well 21 through the first branch pipe 31 in the branched pipe network 3 and accumulates in the upper well to share the rainwater absorption pressure of the main well 1, and with the increase of the rainwater accumulation in the upper well 211, the water level exceeds the junction and communication between the first communicating pipe 213 and the second communicating pipe 214, the rainwater sequentially enters the lower well through the second communicating pipe 214 and the first communicating pipe 213, and permeates into peripheral soil through the holes 4 at the bottom and the peripheral side walls of the lower well 212, and part of the rainwater can also be uniformly distributed to adjacent upper wells 22 through the annular pipe network 23, so that the rainwater permeation is accelerated;

when the rainfall continues to increase, the inflow speed of rainwater in the lower well 212 is greater than the infiltration speed, the water level in the lower well 212 rises rapidly until the lower well 21 is full, at this time, the water level in the main well 1 continues to rise until the higher position, namely the junction and communication position between the upper well 22 and the main well 1, is reached to the upper well 22 through the second branch pipes 32 in the branched pipe network 3, and permeates into the surrounding soil through the infiltration holes 4 at the bottom and on the surrounding side walls of the upper well 22;

when in heavy rain, the inflow speed of rainwater in the high-level well 22 is larger than the penetration speed, the main well 1, the low-level well 21 and the high-level well 22 are filled with rainwater, and at the moment, excessive rainwater can be rapidly discharged through a water outlet on the main well 1 and enters a municipal rainwater pipe network.

While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present application. Accordingly, the scope of the application is defined by the appended claims.

Claims (9)

1. A ring-shaped sponge seepage well, comprising: the device comprises a main well (1), auxiliary wells (2) which are annularly distributed around the main well (1) and a dendritic pipe network (3) which is communicated with 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-level wells (21), a plurality of high-level wells (22) and an annular pipe network (23) for connecting the low-level wells (21) and the high-level wells (22) in series, wherein the plurality of low-level wells (21) and the plurality of high-level wells (22) are arranged in one-to-one correspondence, adjacent and equidistant; the lower well (21) comprises a completely-closed upper well (211) and a lower well (212) with an opening at the top, wherein 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), and the first communicating pipe (213) penetrates through the bottom of the upper well (211) and the other pipe end of the first communicating pipe 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 at two sides of each arc-shaped branch pipe (231) are respectively communicated with the lower part of the lower well (212) and the lower part of the upper well (22) which are adjacent, and the two joints are arranged on the same horizontal plane;

the branch pipe network (3) comprises a plurality of first branch pipes (31) and a plurality of second branch pipes (32), pipe ends at two sides of the first branch pipes (31) are respectively communicated with the lower part of the side wall of the upper well (211) and the upper part of the side wall of the main well (1), pipe ends at two sides of the second branch pipes (32) are respectively communicated with the upper part of the upper well (22) and the upper part of the side wall of the main well (1), and the height of the joint of the first branch pipes (31) and the main well (1) is smaller than that of the joint of the second branch pipes (32) and the main well (1);

the main well (1), the high-level 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).

2. A ring-shaped sponge seepage well as claimed in claim 1 wherein: the diameter of the main well (1) is 3-5 times of the diameter of the low-level well (21) or the diameter of the high-level 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.

3. A ring-shaped sponge seepage well as claimed in claim 1 wherein: the second communicating pipe (214) is an inverted L-shaped pipe, the distance between the 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).

4. A ring-shaped sponge seepage well as claimed in 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 2/3~3/4 height of the main well (1).

5. A ring-shaped sponge seepage well as claimed in claim 1 wherein: the second branch pipe (32) is respectively communicated with the upper part of the side wall of the high-level well (22) and the 4/5-5/6 height of the main well (1).

6. A ring-shaped sponge seepage well as claimed in 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).

7. A ring-shaped sponge seepage well as claimed in claim 1 wherein: and filler (5) is paved at the outer periphery and the inner bottom of the main well (1) and the auxiliary well (2), and the particle size of the filler (5) is larger than the pore diameter of the water seepage hole (4).

8. A ring-shaped sponge seepage well as claimed in claim 7, wherein: the filler (5) is a gravel filler.

9. A construction method of a ring-shaped sponge seepage well, characterized in that the ring-shaped sponge seepage well as claimed in any one of claims 1 to 8 is constructed and obtained, comprising the following steps:

step one: selecting a seepage well construction area, and marking the construction positions of a main well (1) and a secondary well (2) according to design requirements;

step two: digging pits according to the marks;

step three: paving gravel at the bottom of the pit;

step four: the main well (1) and the auxiliary well (2) are vertically arranged at the bottom of the pit;

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

step six: layering and pouring gravel into the periphery and the top of a seepage well in batches for packing, and keeping the pouring depth of the gravel at 20-30 cm each time and compacting;

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