Sponge type coast with gas injection device and construction method of sponge type coast

Abstract

The invention discloses a sponge type coast with an air injection device. The sponge type coast comprises the air injection device and a main body structure, wherein the air injection device is located in the main body structure; the surface of the main body structure comprises a side slope provided with an intercepting ditch and a side slope platform provided with a torrent groove; according to the sponge type coast, the backfill soil layer of the coast is fully fused with the gas injection device, so that the original soil or dredger fill of a coast zone is improved with low cost and high efficiency. According to the construction method of the sponge type coast, through the steps of determining a coast hydraulic reclamation area, paving a bottom layer structure, paving a single-layer soil body structure, carrying out coast treatment for the first time and the like, a gas injection and drainage device is paved while layered soil body filling is carried out, salt and pollution discharge treatment is carried out while the coast is paved, and the treatment efficiency is improved. According to the sponge type coast and the construction method thereof, the coast treatment time can be greatly shortened, the construction period is shortened, and meanwhile a coast soil body which is low in salt and pollution and suitable for planting is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of foundation treatment, and in particular to a sponge-type coast with an air injection device and a construction method thereof. Background Art

[0002] The coast is a waterfront area formed by waves, tides, and currents at the interface between the water and the land. The coastal zone is rich in natural resources such as organisms, minerals, energy, and land. The traditional coastal engineering construction process will cause damage to the coastal environment and waste resources to a certain extent. For this reason, relevant technicians have proposed some traditional coastal soil improvement methods.

[0003] There are two traditional methods of coastal soil improvement and salt removal technology: 1. Adding exogenous substances to the soil. This method requires adding a large amount of exogenous substances and stirring them evenly, which is costly and difficult to operate, and can easily lead to soil alkalinization; 2. Using biological improvement methods. This method has a long cycle and is difficult to improve the deep soil where plant roots are located.

[0004] For this reason, the salt isolation and salt discharge ecological utilization technology of coastal fill soil is still being studied. For example, Chinese patent CN117054628A (publication date: November 14, 2023) discloses a rapid salt discharge test device and method for simulating coastal fill foundation, which relates to the field of soft soil foundation engineering and soil remediation technology. The rapid salt discharge test device for simulating coastal fill foundation includes a test soil box, in which a gravel cushion layer, a permeable geotextile, a clay cake layer, and fine sand are arranged from bottom to top; a rainfall simulator is installed on the top surface of the test soil box; a sampling conduit for sampling and a drainage conduit for discharging accumulated water are installed on the side wall of the test soil box. The sampling conduit is provided with multiple conduits at different heights of the test soil box, and extends into the clay cake layer, and the drainage conduit extends into the gravel cushion layer. The invention realizes the simulation experiment of the salt dissolution and salt discharge mechanism of the salt-containing mud cake fill soil, and provides scientific control parameters for realizing the rapid salt discharge of the coastal mud cake foundation.

[0005] Chinese patent CN114351653A (publication date: April 15, 2022) discloses a coastal fill foundation and its salt removal method. A coastal fill foundation includes a permeable prism of blocks of stone piled around the fill area; a permeable geotextile covering the permeable prism of blocks of stone; a clay cake layer blown on the coastal ground of the fill area; there are pores between the clay cakes of the clay cake layer; and fine sand for filling the gaps laid on the clay cake layer; the fine sand for filling the gaps is hydraulically filled in the pores. This invention is to fundamentally solve the problem of salt removal from the soil of the coastal fill foundation and meet the conditions for plant growth on the coastal fill foundation.

[0006] Chinese patent CN113692796A (publication date: November 26, 2021) discloses a salt discharge structure for coastal saline-alkali land restoration and management, which relates to the field of soil restoration and management technology. The invention includes a solid foundation revetment, a salt washing pipe, a circulation well and an infiltration pipe group, wherein the solid foundation revetment and the infiltration pipe group are buried in the soil, the salt washing pipe is set on the surface, and the salt washing pipe and the infiltration pipe group are connected to the circulation well. The invention combines the infiltration pipes with the coastal revetment structure by setting up a solid foundation revetment and an infiltration pipe group, which can quickly and efficiently carry out soil desalination and restoration of coastal saline-alkali land, and can also use the solid foundation revetment to stabilize the coastal foundation; wherein, the infiltration pipe group is mainly used to infiltrate groundwater and lower the groundwater level, while the salt washing pipe and the circulation well can irrigate and desalinate the planting layer of the saline-alkali land, and the salt in the planting layer is discharged into the circulation well with the water flow for salt deposition and desalination; the desalinated water in the circulation well is used again for irrigation and desalination, which can quickly repair the coastal saline-alkali land.

[0007] Based on the above search results, it can be seen that although the currently proposed coastal foundation and its salt removal method solve the problem that the biological restoration and treatment methods of coastal saline-alkali land have a long action cycle and slow restoration speed, and the commonly used infiltration pipe restoration method easily destroys the soil structure, the existing salt removal methods are single and cannot well achieve low-cost and high-efficiency salt and sewage removal. Therefore, a method is urgently needed to greatly reduce the foundation treatment time, shorten the construction period, and obtain low-salt, low-pollution coastal soil suitable for planting. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a sponge coast with a gas injection device and a construction method thereof.

[0009] A sponge-type coast with an air injection device comprises an air injection device and a main structure; the surface of the main structure comprises a slope and a slope platform, the slope is provided with a water intercepting ditch, and the slope platform is provided with a rapids trough; the main structure is internally installed with an air injection device and a water-permeable pipe.

[0010] The main structure includes a base structure, block stone permeable prisms and multiple single-layer soil structures; the block stone permeable prisms are filled around the filling area, the base structure and multiple single-layer soil structures are located in the designed filling area, and the single-layer soil structure is located above the base structure.

[0011] The single-layer soil structure comprises a sand cushion layer and a clay cake layer, a water-permeable pipe is laid inside the sand cushion layer, and the clay cake layer is laid above the sand cushion layer.

[0012] The gas injection device comprises a gas supply device, a horizontal pipe and a vertical pipe. The horizontal pipe is buried in a sand cushion layer or a clay cake layer. The vertical pipe is perpendicular to the horizontal pipe and penetrates the sand cushion layer and the clay cake layer.

[0013] Furthermore, the material of the permeable pipe is a soft permeable pipe, and the cross section from inside to outside is a spring steel wire, a permeable layer, a filter layer and a covered layer; the permeable pipe is inclined downward by 3-4 degrees along the horizontal line at one end close to the intercepting ditch.

[0014] Furthermore, the pipe opening of the permeable pipe protrudes 10-20 cm from the surface of the single-layer soil structure.

[0015] Furthermore, the top elevation of the bottom structure is flush with the top elevation of the block stone permeable prism; and a permeable geotextile is laid at the connection between the bottom structure and the block stone permeable prism.

[0016] Furthermore, the bottom layer structure includes blown clay cakes and filling fine sand, and the filling fine sand is laid in the pores of adjacent clay cakes.

[0017] Further, the clay cake layer is formed by laying the clay cake.

[0018] Furthermore, the clay cake is in a lump shape, has a size greater than 3 cm, and has a liquid limit index lower than 0.55.

[0019] Furthermore, the thickness of the sand cushion layer is not less than 10 cm.

[0020] Furthermore, the interior of the sand cushion layer includes a drainage channel, and the drainage channel includes a plurality of drainage boards. The slope of the drainage boards is not less than 1%, and the spacing between adjacent drainage boards is 10 to 30 times the thickness of the clay cake layer.

[0021] Furthermore, a horizontal pipe is arranged in the middle of the sand cushion layer.

[0022] Furthermore, the horizontal pipe and the water-permeable pipe are arranged in parallel, and the horizontal pipe is provided with air injection holes, the aperture of the air injection holes is 1.5 to 2.5 mm, the hole spacing is 30 to 80 times of the aperture, and the air injection holes are covered with a filter screen.

[0023] A construction method of a sponge-type coast with an air injection device comprises the following steps:

[0024] Step S1, determining a coastal reclamation area, piling permeable prisms of block stones around the reclamation area, and laying a permeable geotextile on a side close to the reclamation area;

[0025] Step S2, paving the bottom structure, blowing the clay cake into the above-mentioned blowing area, forming pores in the clay cake, and laying filling fine sand in the pores to form a bottom structure, the top elevation of the bottom structure is flush with the top elevation of the block stone permeable prism.

[0026] Step S3, laying a single-layer soil structure. During the laying of each single-layer soil structure, the permeable pipe, the intercepting ditch of the slope and the rapid flow trough of the slope platform are laid simultaneously; when the thickness of the single-layer soil structure reaches the designed thickness, repeat this step until the coastal design elevation is reached;

[0027] Step S4: First coastal treatment: After all single-layer soil structures are laid, continue to inject air until no water flows out of the permeable pipe.

[0028] Furthermore, the construction method of the sponge coast with an air injection device also includes step S5, coast reprocessing, the specific content of which is: after the first foundation treatment is completed, the water discharged from the permeable pipe is collected in rainy weather, and the water is analyzed. If the salt content and pollutant content are greater than the specified value, the operation of step S4 is repeated to further process the coast.

[0029] Furthermore, the step S3 includes the following steps:

[0030] Step S3.1, laying a sand cushion layer, and burying horizontal pipes and permeable pipes in the sand cushion layer, wherein the horizontal pipes and the permeable pipes are evenly distributed in the middle of the sand cushion layer;

[0031] Step S3.2, laying a clay cake layer, laying a clay cake on the sand cushion layer and laying a vertical pipe synchronously according to the position of the horizontal pipe;

[0032] Step S3.3, gas injection and filling: when the clay cake reaches more than 50 cm, gas is injected into the sand cushion layer through the vertical pipe and the horizontal pipe to discharge the water inside the clay cake. The gas injection and filling are carried out simultaneously, and the water flowing out of the permeable pipe is cleaned up in time;

[0033] Step S3.4: When the thickness of the clay cake layer reaches the single-layer design thickness, a drainage ditch is laid on the slope, and a rapids trough is set on the slope platform to complete the laying of the single-layer soil structure.

[0034] Further, the step S4 includes the following steps:

[0035] Step S4.1, injecting air into each single-layer soil structure until no water flows out, and then stopping the injection;

[0036] Step S4.2: After 1-2 hours, inject air into each single-layer soil structure again. If water flows out, continue to inject air;

[0037] Step S4.3, repeat the above step S4.2 until no water flows out after gas is injected into each single-layer soil structure, thus completing the first foundation treatment.

[0038] Furthermore, the clay cake is formed by cutting seabed clay into lumps by a cutter suction dredger.

[0039] Furthermore, the installation method of the permeable pipe is specifically as follows: laying out lines for positioning, setting up scaffolding, positioning a drilling rig, drilling holes, installing a drainage pipe, and fixing the pipe opening.

[0040] Furthermore, the specific method for fixing the pipe mouth of the permeable pipe is: cut the filter membrane along the pipe axis 10-15 cm from the pipe mouth end, pull out and cut the spring, tie the cut filter membrane tightly, and fill the space between the pipe mouth and the drilled hole with cement mortar to prevent the soft drainage pipe from sliding down, and the filling length is 20-25 cm.

[0041] Furthermore, the slope and the slope platform are reinforced by using shotcrete with bidirectional steel mesh; the rapids trough is built with bricks and protected with mortar plastering and cement mortar cushion.

[0042] Compared with the prior art, the advantages and effects of the present invention are as follows:

[0043] 1. The present invention provides a sponge-type coast with an air injection device. The sponge-type coast structure is formed by fully integrating the backfill soil layer of the coast itself with the air injection device. It is adapted to local conditions and makes full use of local resources to achieve low-cost and high-efficiency improvement of the original soil or blown-fill soil in the coastal zone, so that it can be used to plant landscape plants or construct tourist attractions, thereby maximizing economic benefits.

[0044] 2. The present invention provides a sponge-type coast with an air injection device. A sand cushion layer and a clay cake layer are arranged at intervals to form a multi-layer soil structure. The sand cushion layer collects salt water and sewage discharged outward by the air injection device in the clay cake layer due to pressurization, and the clay cake is desalted and decontaminated as much as possible, retaining nutrients and providing nutrients and resources for vegetation growth, thereby making full use of local resources.

[0045] 3. The present invention provides a sponge-type coast with an air injection device. By setting block permeable prisms and permeable geotextiles, it can prevent waves from directly scouring clay cakes and sand and gravel, thereby preventing soil loss; at the same time, clay cakes and sand and gravel will not hinder the material exchange between the coastal ecosystem and the marine ecosystem, thereby improving the coastal species diversity and coastal ecology.

[0046] 4. The present invention provides a construction method for a sponge coast with an air injection device. While filling the layered soil, an air injection drainage device is laid to achieve salt and sewage discharge while laying the coast, which can greatly reduce the coast treatment time, shorten the construction period, and obtain low-salt, low-pollution coastal soil suitable for planting.

[0047] 5. The present invention provides a construction method for a sponge-type coast with an air injection device. The soil used is screened and applied, and the clay obtained by dredging and excavation is used to make mud cakes for paving, so that the project is simple to implement, the project period is short, the project is economical and environmentally friendly, and the sustainability is strong. It is suitable for large-scale promotion and application in the coastal zone.

[0048] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0049] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0051] in:

[0052] Figure 1 It is a structural schematic diagram of a sponge-type coast with a gas injection device;

[0053] Figure 2 This is a structural cross-section of a sponge-type coast with an air injection device;

[0054] Figure 3 The present invention is a flow chart of a construction method of a sponge coast with an air injection device.

[0055] Explanation of the reference numerals: 1-gas injection device; 11-horizontal pipe; 12-vertical pipe; 2-intercepting ditch; 3-permeable pipe; 4-rapid flow trough; 5-sand cushion layer; 6-clay cake layer; 7-stone permeable prism. DETAILED DESCRIPTION

[0056] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0057] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0058] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0059] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0060] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0061] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0062] Example 1

[0063] This embodiment is a sponge-type coast with an air injection device.

[0064] Please refer to Figure 1 A sponge coast with an air injection device comprises an air injection device 1 and a main structure; the surface of the main structure comprises a slope and a slope platform, the slope is provided with a water intercepting ditch 2, and the slope platform is provided with a rapids trough 4; the air injection device 1 and a water-permeable pipe 3 are installed inside the main structure.

[0065] The intercepting ditch 2 is located on the slope surface of the slope. The water flowing out from the soil layer through the permeable pipe 3 flows out and gathers through the intercepting ditch 2 on the slope, turns and flows out through the rapids trough 4 located on the slope platform, and finally gathers into the collection pool; it is used to prevent water accumulation on the coastal ground, prevent sewage backflow, and infiltrate back into the coastal soil during the collection process.

[0066] The rapid flow trough 4 is used to collect sewage discharged from the soil layer above the platform and flow it into the collection pool through the coastal platform. Each platform is arranged with a rapid flow trough, and the height difference between the platforms should not be too high to prevent the rapid flow trough from overflowing and causing sewage to flow back and seep back.

[0067] Technical effect of this embodiment: This embodiment provides a sponge-type coast, which forms a sponge-type coast structure by fully integrating the backfill soil layer of the coast itself with the gas injection device. It adapts to local conditions, makes full use of local resources, and achieves low-cost and high-efficiency improvement of the original soil or blown fill soil in the coastal zone, so that it can be used to plant landscape plants or construct tourist attractions, thereby maximizing economic benefits.

[0068] Example 2

[0069] Based on Example 1, this example is a further design of a sponge-type coast with an air injection device.

[0070] Please refer to Figure 2 The main structure includes a bottom structure, multiple single-layer soil structures and a block stone permeable prism 7; the block stone permeable prism 7 is filled around the filling area, the bottom structure and multiple single-layer soil structures are located in the designed filling area, and the single-layer soil structure is located above the bottom structure. The block stone permeable prism 7 serves as the foot of the coastal slope to prevent soil loss caused by wave scouring. The single-layer soil structure includes a sand cushion layer 5 and a clay cake layer 6, a permeable pipe 3 is laid inside the sand cushion layer 5, and the clay cake layer 6 is laid above the sand cushion layer 5.

[0071] The gas injection device 1 includes a gas supply device, a horizontal pipe 11 and a vertical pipe 12. The horizontal pipe 11 is buried in the sand cushion layer 5 or the clay cake layer 6, parallel to the permeable pipe 3, and has gas injection holes on the pipe wall for increasing the gas pressure in the soil; the vertical pipe is perpendicular to the horizontal pipe, penetrates the sand cushion layer 5 and the clay cake layer 6, and has no gas injection holes on the pipe wall for transmitting gas pressure.

[0072] Furthermore, the elevation of the bottom structure is flush with the top elevation of the block stone permeable prism 7; a permeable geotextile is laid at the connection between the bottom structure and the block stone permeable prism 7; the bottom structure includes blown clay cakes and blown clay cakes, and the caulking fine sand is laid in the pores of adjacent clay cakes.

[0073] Furthermore, the pipe opening of the water-permeable pipe 3 penetrates 10-20 cm from the surface of the single-layer soil structure, and a PVC orifice pipe is arranged at the pipe opening. The material of the water-permeable pipe 3 is a soft water-permeable pipe, and the cross section is a spring steel wire, a water-permeable layer, a filter layer and a covered layer from the inside to the outside; the water-permeable pipe 3 is inclined downward along the horizontal line by 3-4 degrees at one end close to the intercepting ditch 2.

[0074] Furthermore, the clay cake layer 6 is formed by laying clay cakes.

[0075] Furthermore, the clay cake is in a lump shape, has a size greater than 3 cm, and has a liquid limit index lower than 0.55.

[0076] Furthermore, the thickness of the sand cushion layer 5 is not less than 10 cm, and is used to initially collect the salt water and sewage discharged outward due to the pressurization of the gas injection device 1 in the clay cake layer.

[0077] Furthermore, a horizontal pipe 11 is arranged in the middle of the sand cushion layer 5 .

[0078] Furthermore, a drainage channel is provided inside the sand cushion layer 5 , and the drainage channel includes a plurality of drainage boards, the slope of the drainage boards is not less than 1%, and the spacing between adjacent drainage boards is 10 to 30 times the thickness of the clay cake layer 6 .

[0079] Furthermore, the horizontal pipe 11 is provided with air injection holes, and arranged in parallel with the water-permeable pipe 3 , the aperture of the air injection holes is 1.5 to 2.5 mm, the hole spacing is 30 to 80 times of the aperture, and the air injection holes are covered with a filter screen.

[0080] Furthermore, when the pressurized gas is injected into the sand cushion layer 5 through the gas injection device 1, since the sand cushion layer 5 is surrounded by clay cake layers with relatively weak water permeability, the pressurized gas will first diffuse horizontally in the sand cushion layer 5, causing the saturation of the sand to gradually decrease, thereby gradually driving the saturated water in the soil out of the soil through the water-permeable pipe 3. As the air pressure gradually increases, the pressurized gas is injected into the clay cake layer with low water permeability, and the clay cake will split, with radial fine cracks, increasing the water permeability of the blown fill soil, and the water in the clay cake will gradually transfer from the clay cake layer with higher water content to the sand cushion layer 5 from which the water has been discharged, and the salt and pollutants therein will be taken away during the transfer process, thereby achieving the treatment effect required for the sponge-type coastal foundation.

[0081] The technical effect of this embodiment is as follows: by clarifying the thickness of the sand cushion layer and increasing the drainage channel, the drainage efficiency of the sand cushion layer is improved, and the clay cake is desalted and decontaminated as much as possible at low cost and high efficiency, nutrients are retained, and nutrients and resources are provided for vegetation growth, making full use of local resources. By setting up block stone permeable prisms and permeable geotextiles, waves can be prevented from directly scouring the clay cake and sand and gravel, and soil loss can be prevented.

[0082] Example 3

[0083] Based on Examples 1-2, this example provides a construction method for a sponge-type coast with an air injection device.

[0084] Please refer to Figure 3 , a construction method of a sponge coast with an air injection device, comprising the following steps:

[0085] Step S1, determining a coastal filling area, piling up rock permeable prisms 1 around the filling area, and laying a permeable geotextile on the side close to the filling area;

[0086] Step S2, paving and filling the bottom structure, blowing and filling the clay cake to the above-mentioned blowing and filling area, and forming pores in the clay cake, and paving the pores with filling fine sand to form a bottom structure, wherein the top elevation of the bottom structure is flush with the top elevation of the block stone permeable prism;

[0087] Step S3, laying a single-layer soil structure. During the laying of each single-layer soil structure, the permeable pipe 3, the intercepting ditch of the slope and the rapid flow trough of the slope platform are laid simultaneously; when the thickness of the single-layer soil structure reaches the designed thickness, repeat this step until the coastal design elevation is reached;

[0088] Step S4, the first coastal treatment, after all single-layer soil structures are laid, continue to inject air until no water flows out of the permeable pipe 3.

[0089] The technical effect of this embodiment is as follows: while filling the layered soil, an air injection drainage device is laid to achieve salt and sewage treatment while laying the coast, which can greatly reduce the coastal treatment time, shorten the construction period, and obtain low-salt, low-pollution coastal soil suitable for planting.

[0090] Example 4

[0091] Based on Example 3, this example further optimizes the construction method of a sponge-type coast with an air injection device.

[0092] Furthermore, the construction method of the sponge coast with an air injection device also includes step S5, coast reprocessing, the specific content of which is: after the first foundation treatment is completed, the water discharged from the permeable pipe 3 is collected in rainy weather, and the water is analyzed. If the salt content and pollutant content are greater than the specified value, the operation of step S4 is repeated to further process the coast.

[0093] Technical effect of this embodiment: The present invention proposes a method for further processing the coast. By utilizing natural meteorology, the processing results of the processed coast can be tested. At the same time, natural rainwater can be used for sewage and salt treatment again to achieve the recycling of resources. At the same time, the method is simple, easy to operate, and can be promoted on a large area.

[0094] Example 5

[0095] Based on Example 3, this embodiment provides a further optimized solution for the construction method of a sponge-type coast with an air injection device.

[0096] Furthermore, the clay cake is formed by cutting seabed clay into lumps by a cutter suction dredger.

[0097] Furthermore, the step S3 includes the following steps:

[0098] Step S3.1, paving a sand cushion layer 5, and burying a horizontal pipe 11 and a permeable pipe 3 in the sand cushion layer 5 to improve the water permeability of the coast, and the horizontal pipe 11 and the permeable pipe 3 are evenly distributed in the middle of the sand cushion layer;

[0099] Step S3.2, laying the clay cake layer 6, laying the clay cake on the sand cushion layer 5 and laying the vertical pipe 12 synchronously according to the position of the horizontal pipe 11;

[0100] Step S3.3, gas injection and filling, when the clay cake reaches more than 50 cm, gas is injected into the sand cushion layer 5 through the vertical pipe 12 and the horizontal pipe 11 to discharge the water inside the clay cake. The gas injection and filling are carried out simultaneously, and the water flowing out of the permeable pipe 3 is cleaned up in time;

[0101] Step S3.4: When the thickness of the clay cake layer 6 reaches the single-layer design thickness, a drainage ditch 2 is laid on the slope, and a rapid flow trough 4 is set on the slope platform to complete the laying of the single-layer soil structure.

[0102] Furthermore, the installation method of the permeable pipe 3 is specifically as follows: laying out lines for positioning, setting up scaffolding, positioning a drilling rig, drilling holes, installing a drainage pipe, and fixing the pipe opening.

[0103] Furthermore, the specific method for fixing the pipe mouth of the permeable pipe 3 is: cut the filter membrane along the pipe axis 10-15 cm from the pipe mouth end, pull out and cut the spring, tie the cut filter membrane tightly, and fill the space between the pipe mouth permeable pipe and the drilled hole with cement mortar to prevent the soft drainage pipe from sliding down, and the filling length is 20-25 cm.

[0104] Furthermore, the slope and the slope platform are reinforced by spraying concrete with a bidirectional steel mesh; the rapids trough 4 is built with bricks and protected with mortar plastering and cement mortar cushioning.

[0105] Further, the step S4 includes the following steps:

[0106] Step S4.1, injecting air into each single-layer soil structure until no water flows out, and then stopping the injection;

[0107] Step S4.2: After 1-2 hours, inject air into each single-layer soil structure again. If water flows out, continue to inject air;

[0108] Step S4.3, repeat the above step S4.2 until no water flows out after gas is injected into each single-layer soil structure, thus completing the first foundation treatment.

[0109] The technical effect of this embodiment is as follows: by screening and applying the soil to be used, the clay obtained by dredging and excavation is used to make mud cakes for paving, which is simple to implement, has a short construction period, is economical and environmentally friendly, has strong sustainability, and is suitable for large-scale promotion and application in coastal areas.

[0110] In summary, the present invention provides a sponge coast with an air injection device and a construction method thereof, which can carry out salt and sewage treatment while laying the coast, which can greatly reduce the coast treatment time, shorten the construction period, and obtain low-salt and low-pollution coastal soil suitable for planting. The invention is original and innovative.

[0111] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sponge-type coast with an air injection device, characterized in that: It comprises an air injection device (1) and a main structure; the surface of the main structure comprises a side slope and a side slope platform, the side slope is provided with a water intercepting ditch (2), and the side slope platform is provided with a rapid flow trough (4); the inside of the main structure is installed with an air injection device (1) and a water permeable pipe (3).

2. A sponge-type coast with an air injection device according to claim 1, characterized in that: The main structure comprises a base structure, a block stone permeable prism (7) and a plurality of single-layer soil structures; the block stone permeable prism (7) is filled around the filling area, the base structure and the plurality of single-layer soil structures are located in the designed filling area, and the single-layer soil structure is located above the base structure.

3. A sponge-type coast with an air injection device according to claim 2, characterized in that: The single-layer soil structure comprises a sand cushion layer (5) and a clay cake layer (6), a water-permeable pipe (3) is laid inside the sand cushion layer (5), and the clay cake layer (6) is located above the sand cushion layer (5).

4. The sponge-type coast with an air injection device according to claim 3, characterized in that: The gas injection device (1) comprises a gas supply device, a horizontal pipe (11) and a vertical pipe (12); the horizontal pipe (11) is buried in a sand cushion layer (5) or a clay cake layer (6); and the vertical pipe is perpendicular to the horizontal pipe and penetrates the sand cushion layer (5) and the clay cake layer (6).

5. The sponge-type coast with an air injection device according to claim 2, characterized in that: The top elevation of the bottom structure is flush with the top elevation of the block stone permeable prism (7); and a permeable geotextile is laid at the connection between the bottom structure and the block stone permeable prism (7).

6. The sponge-type coast with an air injection device according to claim 3, characterized in that: The thickness of the sand cushion layer (5) is not less than 10 cm.

7. The sponge-type coast with an air injection device according to claim 3, characterized in that: The horizontal pipe (11) and the water-permeable pipe (3) are arranged in parallel. The horizontal pipe (11) is provided with air injection holes. The diameter of the air injection holes is 1.5 to 2.5 mm. The hole spacing of the air injection holes is 30 to 80 times the diameter. The outer surface of the air injection holes is covered with a filter.

8. A construction method for a sponge-type coast with an air injection device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, determining a coastal reclamation area, piling up rock permeable prisms (1) around the reclamation area, and laying a permeable geotextile on a side close to the reclamation area; Step S2, paving and filling the bottom structure, blowing and filling the clay cake to the above-mentioned blowing and filling area, and forming pores in the clay cake, and paving the pores with filling fine sand to form a bottom structure, wherein the top elevation of the bottom structure is flush with the top elevation of the block stone permeable prism; Step S3, laying a single-layer soil structure. During the laying of each single-layer soil structure, the permeable pipe (3), the intercepting ditch of the slope and the rapid flow trough of the slope platform are laid simultaneously; when the thickness of the single-layer soil structure reaches the designed thickness, repeat this step until the designed elevation of the coast is reached; Step S4, the first coastal treatment, after all single-layer soil structures are laid, continue to inject air until no water flows out of the permeable pipe (3).

9. The construction method of a sponge-type coast with an air injection device according to claim 8, characterized in that: The method further includes step S5, coast reprocessing, which specifically includes: after the first foundation treatment is completed, the water discharged from the permeable pipe (3) is collected in rainy weather and analyzed. If the salt content and pollutant content are greater than the specified values, the operation of step S4 is repeated to further process the coast.

10. A method for constructing a sponge-type coast with an air injection device according to claim 8 or 9, characterized in that: The step S3 comprises the following steps: Step S3.1, laying a sand cushion layer (5), and burying a horizontal pipe (11) and a water-permeable pipe (3) in the sand cushion layer (5), wherein the horizontal pipe (11) and the water-permeable pipe (3) are evenly distributed in the middle of the sand cushion layer; Step S3.2, laying a clay cake layer (6), laying the clay cake on the sand cushion layer (5) and laying the vertical pipe (12) synchronously according to the position of the horizontal pipe (11); Step S3.3, gas injection and filling, when the clay cake reaches more than 50 cm, gas is injected into the sand cushion layer (5) through the vertical pipe (12) and the horizontal pipe (11) to discharge the water inside the clay cake. The gas injection and filling are carried out simultaneously, and the water flowing out of the permeable pipe (3) is cleaned up in time; Step S3.4: When the thickness of the clay cake layer (6) reaches the single-layer design thickness, a drainage ditch (2) is laid on the slope, and a rapid flow trough (4) is set on the slope platform to complete the laying of the single-layer soil structure.

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