KR102699632B1 - Stabilization of the surface layer for dredged soil ponds and embankment - Google Patents

Abstract

The present invention relates to a surface drying method and a backfilling method for a dredged soil dump site, and more specifically, to a surface drying method and a backfilling method for a dredged soil dump site, which simultaneously remove surface water and pore water in the super-soft ground of a dredged soil dump site created by dredging and reclamation, etc., while differentially increasing the ground strength of a construction-use road area requiring high bearing capacity, thereby enabling early entry of large equipment into the dredged soil dump site and early commencement of backfilling work. The present invention divides the super-soft ground of a dredged soil dump site into a construction-use road area and a general area, and intensively installs open channels and drainage materials, as well as rigid perforated pipe drainage materials, capillary evaporation-induced drainage materials, and micro drainage materials in the construction-use road area requiring high bearing capacity, thereby differentially increasing the strength of the super-soft ground of the construction-use road area. Accordingly, large equipment can be brought into the dredged soil dump site, which is in a very soft state, early to begin backfill work, and thus the site preparation work for the dredged soil dump site can be completed quickly and inexpensively.

Description

Stabilization of the surface layer for dredged soil ponds and embankment

The present invention relates to a surface drying method and a backfilling method of a dredged soil dump site, and more specifically, to a surface drying method and a backfilling method of a dredged soil dump site, which simultaneously removes surface water and pore water in the super-soft ground of a dredged soil dump site created by dredging and reclamation, while differentially increasing the ground strength of a road section for construction use requiring high bearing capacity, thereby enabling early entry of large equipment into the dredged soil dump site and early commencement of backfilling work.

In general, soft ground dredging landfills must be preceded by soft ground treatment work involving heavy equipment. In other words, in order to perform soft ground treatment work on dredging landfills, the minimum bearing capacity must be secured to ensure the drivability of heavy equipment deployed on the dredging landfill. In contrast, the ultra-soft ground of dredging landfills is in a sludge state and has high compressibility and deformability, so it has almost no bearing capacity.

The method of securing drainage and heavy equipment driving capability of ultra-soft ground, which has been mainly applied to construction so far, was to leave the site for a long period of time after dredging and filling, and then spread reinforcing materials such as geotextiles and sand. However, with this method, the site must be left for a long period of time to secure the minimum bearing capacity for heavy equipment and personnel to enter the site and work. In other words, for soft ground treatment construction, a period of at least several months to several tens of months is required after dredging and filling.

However, this method of securing durability by allowing a period of abandonment has the problem that the construction period is prolonged, and there is also the problem that collective complaints are made by residents around the dredged landfill site due to the habitat of pests during the period of abandonment. Accordingly, a method for early drainage of the super-soft ground surface is required.

However, it is impossible to install and construct conventional heavy-duty drainage structures in ultra-soft ground with sludge characteristics that are highly compressible and deformable.

In addition, even if conventional drainage channels and collection wells are installed, only surface water can be collected and drained, and there is a problem of a large amount of sludge flowing into the drain.

In addition, vertical and horizontal drainage materials made of pipes may be applied, but their structure increases the manufacturing cost, and unlike open channels, they cannot handle large amounts of water during the rainy season or heavy rain. In addition, since these drainage materials alone can only improve the surface of soft ground, the construction cost increases significantly.

Accordingly, there is a need for economical technological development that can shorten the construction period.

The patented technology registered as Patent No. 784174, Patent No. 964893, and Patent No. 1019882 is to install a channel and drainage material that have both permeability and drainage functions on the surface layer of ultra-soft ground to remove surface water and ground water of ultra-soft ground created by dredging and reclamation, etc. This is a technology that increases the strength of the surface layer of ultra-soft ground by draining surface water and ground water at the same time.

According to this, surface water could be efficiently and quickly drained out of the dredged soil dump site by the open channel. However, it was not easy to economically and quickly remove the ground water in the entire surface layer of the vast dredged soil dump site by only using the lower drainage material of the open channel.

In particular, the above patented technology has no construction road for transporting backfill materials (soil, rocks, sand, gravel, etc.) and moving large equipment (dump trucks, excavators, bulldozers, etc.) in the super-soft dredged soil dump site, making it difficult to enter the site, transport backfill materials, and complete the work. In other words, backfill work still requires high construction costs and a long construction period.

The present invention has been made to solve the above-described problems, and aims to provide a surface drying method and a backfilling method of a dredged soil dump site, which can quickly and efficiently dry the surface layer of ultra-soft ground in a dredged soil dump site at a low cost and perform backfilling work early.

In addition, the present invention aims to provide a surface construction method and a backfilling method for a dredged soil dump site, which can secure a wide and high-strength construction road early, allowing the entry and driving of large heavy equipment such as dump trucks, excavators, and bulldozers at a rapid pace, and enabling the transport and leveling of backfilling materials such as earth, rocks, sand, and gravel.

The technical problems of the present invention are not limited to the above-mentioned purposes, and other purposes and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, it will be easily understood that the purposes and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

In order to solve the above-described problem, the present invention divides the ultra-soft ground of a dredged soil dump site into a construction road area (area 1) and a general area (area 2), and, in the construction road area requiring high bearing capacity, intensively installs a rigid perforated pipe drainage material, a capillary evaporation-induced drainage material, and a micro-drainage material together with the open channel and drainage material described below, thereby differentially increasing the strength of the ultra-soft ground of the construction road area.

Accordingly, large equipment can be brought into the dredged soil dump site, which is in a very soft state, early to begin backfill work, so that the site preparation work for the dredged soil dump site can be completed quickly and inexpensively.

The present invention provides a surface drying facility for a dredged soil dumping site.

The above surface drying facility comprises a plurality of channels.

The above-mentioned structure comprises a mesh-shaped frame and a water-permeable filter wall covering the surface of the mesh-shaped frame, and is extended in the first direction and embedded in ultra-soft ground.

In a plurality of numbers, they are arranged spaced apart from each other in a second direction intersecting the first direction.

The above surface drying facility includes a plurality of rigid perforated pipe drainage materials.

The above-mentioned rigid perforated pipe drainage material is connected to the bottom surface of each of the above-mentioned channels and is extended in the second direction longer than the width of the above-mentioned channels compared to the above-mentioned channels.

A plurality of rigid perforated pipe drainage materials are arranged spaced apart from each other in the first direction on the bottom surface of each of the above-described channels.

The above rigid perforated pipe drainage material includes a rigid perforated pipe extending in the second direction, and a permeable filter material extending in the second direction and sewn onto a permeable filter wall on the bottom surface of each of the above channels.

The above-mentioned filter material has the above-mentioned rigid porous tube penetrating and accommodated therein.

The above rigid perforated tube extends longer in the second direction than the width of the channel. Accordingly, the above rigid perforated tube supports a stable position of the channel.

The above-mentioned pitcher filter material extends slightly longer in the second direction than the above-mentioned rigid perforated tube.

The above surface drying facility includes a water collection and drainage material accommodated inside the above rigid perforated pipe drainage material.

The above-mentioned water collection and drainage material penetrates a plurality of the above-mentioned rigid perforated pipes aligned in the second direction and connects a plurality of the above-mentioned water channels.

The ends of the above rigid perforated pipe are finished by tying the longitudinal ends of the above permeable filter material with cable ties, strings, etc. while the above water collection and drainage material penetrates them. Accordingly, it is possible to prevent sludge from flowing into the inside of the above rigid perforated pipe through the ends of the above rigid perforated pipe.

The above-mentioned water collection and drainage material includes a water collection and drainage core material extending in the second direction and a permeable filter material surrounding the water collection and drainage core material.

The above surface drying facility includes a capillary evaporation-induced drainage material.

The above capillary evaporation-induced drainage material is installed at multiple locations within a first area of ultra-soft ground extending a predetermined distance in the second direction from both sides of the width direction of the above-mentioned water channel.

The above capillary evaporation-induced drainage material is installed in a plurality of locations spaced apart from each other in the first direction and the second direction in the first region.

The above capillary evaporation-induced drainage material is installed so that its upper part is exposed above the surface of the ultra-soft ground.

The installation density of the capillary evaporation-induced drainage material installed in the first area is higher than the installation density of the capillary evaporation-induced drainage material installed in the second area other than the first area.

The above capillary evaporation-induced drainage material includes a press-fit permeable filter material whose lower part is buried in the ground of the ultra-soft ground and whose upper part is exposed to the upper surface of the ultra-soft ground, and a support stick that is press-fitted together near the press-fit position of the press-fit permeable filter material.

The above-mentioned pressurized permeable filter material extends upward from the surface and is fixed to the support stick.

The tip of the above-mentioned pressurized permeable filter material is positioned at a position lower than the fixed portion of the above-mentioned support stick.

The tip of the above-mentioned pressurized permeable filter material is sewn into a ring shape.

The above surface drying facility includes a micro drainage material embedded in the ultra-soft ground, which is connected to the permeable filter wall of the above channel and extends away from the above channel.

The above micro-drainage materials are installed at multiple locations spaced apart along the extension direction of the water channel.

The above micro-drainage material is connected by sewing the longitudinal end portion to the permeable filter wall of the above water channel.

The above micro-drainage material further comprises additional drainage materials that are sewn and connected to extend in both width directions at multiple locations along the length direction.

The above micro drainage material has its tip sewn into a ring shape.

The above micro-drainage material includes at least one of a horizontal micro-drainage material that is embedded so as to be connected to a side surface or a bottom surface of the channel and extend laterally outward, and a vertical micro-drainage material that is embedded so as to be connected to a side surface or a bottom surface of the channel and extend downward.

The present invention provides a surface drying method for drying a surface layer by constructing the surface drying facility in a dredged soil dumping site.

This includes the step of burying the above-mentioned channel in the surface layer of the dredged soil dumping area together with a rigid perforated pipe drainage material connected to the lower portion of the above-mentioned channel, with the upper portion of the above-mentioned channel being exposed above the surface layer.

The above rigid duct is buried while containing the water collection and drainage material.

The above micro-drainage material is buried together with the water channel with the base portion sewn to the permeable filter wall of the water channel. Then, the ring provided at the tip of the micro-drainage material is pressed and buried with a long stick.

The above capillary evaporation-induced drainage material is buried in the first area around the above water channel after installing the above water channel and micro drainage material, but the upper part is exposed above the surface.

The above capillary evaporation-induced drainage material is formed by forcing a pressurized permeable filter material into the ground using a pressurized mold, and burying the pressurized permeable filter material in the ground with the gaps between the pressurized permeable filter materials widened.

The upper part of the above capillary evaporation-induced drainage material is tied to a support stick, and its tip is allowed to droop toward the ground.

The present invention provides a method for backfilling a dredged soil dump site.

The above-mentioned backfilling method first constructs the surface drying facility described above, and then proceeds to a drying step of drying the surface of the dredged soil dumping site using the above-mentioned surface drying method.

The above-mentioned backfilling method includes a laying step of laying ground reinforcement material on the surface of the dredged soil dump site after the drying step.

The above-mentioned backfilling method performs backfilling after the above-mentioned laying step.

This includes a construction road construction step of transporting, unloading, and stopping backfill material in the upper area of the ground reinforcement material of the first area around the above-mentioned waterway and its left and right sides, thereby constructing a plurality of construction roads spaced apart from each other in the width direction.

The above-mentioned number of avenues and the first area correspond to the planned road construction site.

Next, the backfill material is transported through the above construction road, the backfill material is unloaded near the width-wise edge of the above construction road, and the backfill material is pushed in by leveling equipment to approximately the midpoint with respect to another adjacent construction road to perform the first backfill.

Next, the backfill material is transported through the other construction road, and the backfill material is unloaded near the edge of the other construction road adjacent to the edge of the other construction road, and the backfill material is pushed in by a leveling device to approximately the midpoint of the other construction road adjacent to the backfill material, thereby connecting the two construction roads in the width direction.

As described above, the stages of constructing a road for construction, performing the first backfill, and performing the second backfill can be performed sequentially, simultaneously with a time difference, or repeatedly.

According to the present invention, since large equipment can be introduced early into a dredged soil dumping site that is in a super-soft state, the construction of a dredged soil dumping site can be carried out more quickly and inexpensively.

As described above, the surface drying and backfilling method of the dredged soil dumping site according to the present invention can inexpensively and quickly improve the strength of ultra-soft ground by installing a water collection/drainage device that functions both as a water infiltration and a drain, a rigid perforated pipe drainage material, a capillary evaporation-induced drainage material, and a micro drainage material at regular intervals and at regular depths. Accordingly, large equipment (dump trucks, excavators, bulldozers, etc.) can enter and transport backfill materials (soil, sand, gravel, etc.).

In addition to the effects described above, specific effects of the present invention are described below together with specific details for carrying out the invention.

Figure 1 is a perspective view of an example surface drying facility constructed in a dredged soil dumping site.
Figure 2 is a plan view of Figure 1.
Figure 3 is a front cross-sectional view of Figure 1.
Figure 4 is a side cross-sectional view of Figure 1.
Figure 5 is an enlarged perspective view of the canal.
Figure 6 is a bottom perspective view of Figure 5.
Figure 7 is a cross-sectional perspective view of a rigid perforated pipe and a water collection and drainage material built into it.
Figure 8 is a cross-sectional perspective view of a drainage core material.
Figure 9 is a cross-sectional perspective view of the water collection core material of Figure 8 with a permeable filter material surrounding it.
Figure 10 is a plan view of a waterway and a rigid perforated pipe drainage material.
Figure 11 is a perspective view of a capillary evaporation-induced drainage material.
Figure 12 illustrates that the capillary evaporation-induced drainage material is pressed in by a press mold.
Figure 13 is a cross-sectional view of a dredged soil dumping site with a capillary evaporation-induced drainage material installed.
Figure 14 is a plan view of a surface drying facility with a capillary evaporation-induced drainage material installed.
Figure 15 is a cross-sectional view of a surface drying facility with micro-drainage installed.
Figure 16 is a plan view of a horizontal micro drainage device.
Figure 17 is a side view of a vertical micro drain.
Figure 18 is a perspective view of a construction road built on a canal and its surrounding area.
Figure 19 is a perspective view of the state in which backfill material has been unloaded on the construction road of Figure 18.
Figure 20 is a perspective view of the state in which the backfill material of Figure 19 has been stopped, the first backfill material has been applied, and another backfill material has been unloaded.
Figure 21 is a perspective view of the state in which the backfill material of Figure 20 has been stopped and the second backfill has been applied to connect the adjacent construction road in the width direction.
Figure 22 is a cross-sectional view of a construction road built on a canal and its surrounding area.
Figure 23 is a perspective view of the state in which backfill material has been unloaded on the construction road of Figure 22.
Figures 24 to 27 are drawings showing the soil restoration construction in order.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

The present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and with various modifications. The present embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Therefore, the present invention is not limited to the embodiments disclosed below, but should be understood to include all modifications, equivalents, or substitutes included in the technical spirit and scope of the present invention, as well as substituting or adding the configuration of one embodiment with the configuration of another embodiment.

The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention. In the drawings, the components may be expressed exaggeratedly large or small in size or thickness for convenience of understanding, but the protection scope of the present invention should not be construed as being limited due to this.

The terminology used herein is only used to describe specific implementations or examples and is not intended to limit the present invention. And the singular expression includes the plural expression unless the context clearly indicates otherwise. In the specification, terms such as "comprises", "consists of", etc. are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification. That is, it should be understood that terms such as "comprises", "consists of", etc. do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Terms including ordinal numbers such as first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. Thus, unless otherwise stated, a first component may also be a second component.

When it is said that a component is "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components in between. On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

When a component is referred to as being "above" or "below" another component, it should be understood that it is not only positioned directly above that other component, but that there may also be other components intervening there.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless expressly defined in this application.

[by number]

Referring to the drawings, the surface drying method and backfilling method of the dredged soil dumping site according to the embodiment of the present invention provides an open channel (10) having a side surface and a bottom surface.

The above-mentioned channel (10) is open and has an equilateral trapezoidal cross-section shape with a width that narrows downward. Accordingly, the above-mentioned channel (10) can be easily installed by burying it underground from the surface of the dredged soil dumping area. However, the cross-sectional shape is not necessarily limited to this.

The above-mentioned water channel (10) includes a mesh-shaped frame (11) forming a side portion and a bottom portion. The above-mentioned water channel (10) is manufactured by covering and fixing a water filter wall (12, geosynthetics, etc.) forming a water filter layer to the outside of the mesh-shaped frame (11). Accordingly, the water filter wall (12) surrounds the side portion and the bottom portion of the water channel (10). The water filter wall (12) allows water to pass into the water channel (10), but blocks the inflow of sludge.

A surface water passage (13) is provided on the upper side of the above-mentioned channel (10) to allow surface water (3) floating on the sludge to quickly flow into the inside of the channel (10).

The above-mentioned water channels (10) are laid in a parallel arrangement at regular intervals on the surface of the ultra-soft ground. At this time, the upper part of the water channels (10) is exposed higher than the ground. Accordingly, during the rainy season or heavy rain, a large amount of water can quickly flow into the upper part of the open water channels (10) and be discharged.

By burying the canal (10) in this way, the ground water of the super-soft ground (1) can be quickly discharged without the inflow of sludge to the depth of the minimum canal (10) burying, so that the surface layer of the super-soft ground can be improved early. The pressure inside the super-soft ground (1) facing the canal (10) with the permeable filter wall (12) in between is greater than the pressure inside the canal (10). The ground water or the pore water of the super-soft ground (1) naturally flows into the canal through the permeable filter wall (12) due to this pressure difference.

The inside of the above-mentioned channel (10) can be filled with a buoyancy control weight (14) that does not interfere with water flow. If the buoyancy control weight (14) is properly injected, the surface water passage hole (13) can be arranged near the ground (2). According to the present invention, the burial depth of the channel (10) can be simply adjusted in this way, and the early improvement of the surface layer can be promoted by promoting rapid drainage of surface water (3).

It is not necessary to insert the above buoyancy control weight (14) into the inside of the channel (10). For example, it may be provided in the form of being attached or hung on the side or bottom surface of the channel (10).

In order to facilitate the flow of water flowing into the channel (10), a drainage space (17) not filled with a buoyancy control weight (14) may be provided inside the channel (10). The drainage space (17) may be provided by a permeable member (15) that provides a porous surface of a size that the buoyancy control weight (14) cannot pass through. The embodiment exemplifies a structure in which a perforated pipe (16) is placed at the bottom of the channel (10) as a permeable member (15) and gravel or the like is filled as a buoyancy control weight (14).

However, this is only one example, and there may be various ways to provide a drainage space (17). For example, a mesh screen that extends horizontally to connect both side surfaces of a water channel (10) may be installed as a water-permeable member (15), and a weight (14) for buoyancy control may be placed on top of the mesh screen, so that the lower space of the mesh screen can be utilized as a drainage space (17).

As the above buoyancy control weight (14), various materials such as gravel, sand, waste blocks, etc. may be used as long as they do not impede the drainage flow of surface water or ground pore water flowing into the channel (10).

The drainage space (17) provided in this way prevents the phenomenon of branches, gravel, soil, etc. flowing into the drainage channel (10) and accumulating, thereby obstructing the drainage flow and hindering the function of the drainage channel (10).

In particular, it is noteworthy that gravel, etc. filled with the above buoyancy control weight (14) has a filtering function that prevents tree branches or foreign substances from flowing into the drainage space (17).

A drainage pump (22) can be connected at regular intervals on the revetment side. The water filled inside the channel (10) that can collect and drain surface water and ground water simultaneously can be forcibly drained through the drainage pump (22) on the revetment side or can be naturally drained.

In the case where the canal (10) is extended long, drainage pumps can be installed at regular intervals in the canal (10) as needed to facilitate drainage. For example, water in the canal (10) close to the land side and far from the shore can be pumped to the shore side drainage pump through the drainage pump, so that water collected in the canal (10) of the land side can be smoothly drained.

[Collecting Department]

If necessary, a water collection unit (20) may be installed adjacent to the above-mentioned water channel (10). The water collection unit (20) may be installed near the water channel (10) close to the embankment side. However, as explained above, natural drainage and forced drainage can be smoothly achieved with only the water channel (10) without the water collection unit (20).

In this way, the embodiment can rapidly improve the surface of the super-soft ground by quickly and forcibly or naturally draining the water that has flowed into the channel (10) out of the dredged soil dump site.

[Gangseong Yugongwan drainage material]

According to an embodiment, a rigid perforated pipe drainage material (30) may be further installed on the lower part of the bottom surface of the above-mentioned water channel (10).

In the embodiment, a rigid perforated pipe drainage material (30) is installed so as to extend longer than the width of the water channel (10) in a direction intersecting the extension direction of the water channel (10), thereby performing a complementary and complex water collection and drainage function together with the water channel (10), and maintaining a stable position of the water channel (10) of the upper and lower narrowing that is extended vertically.

The above rigid perforated pipe drainage material (30) is provided in a form in which a rigid perforated pipe (31) that extends longer than the width of the channel (10) in a direction intersecting the extension direction of the channel (10) provides rigidity for increasing the lateral stability of the channel (10) and can provide a water collection and drainage space that extends in a direction intersecting the extension direction of the channel (10).

In particular, in order to stably maintain the position of the channel (10) into which the buoyancy control weight (14) is introduced, it is desirable that the channel (10) and the rigid perforated pipe drainage material (30) be stably connected. In addition, it is desirable that the connection between them be easily made.

In the embodiment, a flexible permeable filter material (32, geosynthetics, etc.) is sewn to produce a cylindrical shape into which a tube can be inserted, but is made longer than the width of the permeable filter wall (12) that surrounds the bottom surface of the water channel (10), and is fixed to the bottom surface of the water channel (10) by sewing or the like.

And, each rigid perforated pipe (31) is inserted into each of the permeable filter materials (32). The length of the permeable filter material (32) is extended slightly longer than the length of the rigid perforated pipe (31). The rigid perforated pipe (31) is inserted into the permeable filter material (32) connected to the bottom surface of the water channel (10) and connected to the water channel (10). Accordingly, the ground pore water flowing into the water collection and drainage material (40) described later can be easily collected in the water channel (10).

The above rigid porous pipe (31) may be, for example, a PVC pipe having a porous surface.

The two ends of the above rigid perforated pipe (31) are finished so that dredged soil, etc., do not flow into the inside while the water collection and drainage material (40) described later penetrates through them. For example, the above finishing can be achieved by tying the two ends of a water filter material (32) longer than the rigid perforated pipe (31) with a string or cable tie, etc.

According to this structure, it is very easy to connect the drainage material (40) to the bottom of the channel (10) and to arrange the drainage material (40) so as to cross a plurality of channels (10).

The porous rigid perforated tube (31) is closely connected to the water channel (10) through the permeable filter material (32), and due to the permeability of the permeable filter material (32), water is not prevented from permeating into the rigid perforated tube (31) even in the section inserted into the permeable filter material (32).

The example exemplifies a porous PVC pipe as the rigid perforated pipe (31), but pipes made of various materials can be used as long as the surface is porous and the material can secure rigidity. In addition, the cross-sectional shape of the rigid perforated pipe (31) is not limited to a cylindrical shape. For example, since the permeation filter material (32) sewn to the above-mentioned water channel (10) is flexible, the rigid perforated pipe (31) can also have various cross-sectional shapes. In other words, a rigid perforated pipe (31) in the shape of a square tube can also be used.

[Drainage drainage material]

A water collection and drainage material (40) can be inserted into the above rigid perforated pipe (31). The water collection and drainage material (40) is fixed to the bottom surface of a plurality of channels (10) spaced apart from each other in the second direction and is sequentially inserted into a plurality of rigid perforated pipes (31) aligned in the second direction, thereby connecting a plurality of the above rigid perforated pipe drainage materials (30) and the above channels (10) in the second direction.

The above-mentioned water collection and drainage material (40) may be in the form of a water collection and drainage core material (41) having a mesh shape, plate shape, harmonica shape, or perforated pipe shape, etc., with a water permeable filter material (42, geosynthetics, etc.) surrounding the surface. Then, the internal space of the water collection and drainage core material (41) provides a space where water can be collected and drained, and the water permeable filter material (42) allows water to pass into the internal space, but prevents sludge, mud, or dredged soil from flowing in.

Accordingly, in the lower part of the water channel (10), groundwater or ground pore water flows into the interior of the rigid perforated pipe (31) through the porous surface of the rigid perforated pipe (31) in the section where the water collection and drainage material (40) is inserted into the rigid perforated pipe (31), and flows into the internal space of the water collection and drainage core material (41) through the water-permeable filter material (42) and is collected. In addition, in the section where the water collection and drainage material (40) is exposed to the outside of the rigid perforated pipe (31), it flows into the internal space of the water collection and drainage core material (41) through the water-permeable filter material (42) and is collected.

And, the ground pore water collected in the drainage material (40) in this way flows into the drainage material (10) through the bottom surface of the drainage material (40) in contact with the drainage material (10) and can be quickly drained to the outside of the dredged soil dumping site through the drainage material (10).

The water collection and drainage core material (41) of the above water collection and drainage material (40) has relatively weak rigidity compared to the rigid perforated pipe (31), but can support the standing posture of the open channel (10) together with the rigid perforated pipe (31). The rigid perforated pipe (31) and the water collection and drainage core material (41) are simply and sturdily connected to the bottom surface of the open channel (10) and are arranged in a grid shape, thereby allowing a plurality of open channels (10) and a plurality of rigid perforated pipe drainage materials (30) and water collection and drainage materials (40) to maintain a constant gap between each other, and exhibit a supporting function that prevents the open channel (10) from tilting on ultra-soft ground or falling over due to wind, etc. This is of great help not only after the installation of the open channel (10) but also during the installation process of the open channel (10).

In addition, according to this, the width of the channel (10) can be minimized, making the construction of the channel (10) easier, the manufacturing cost of the channel (10) is greatly reduced, and a small amount of weight (14) for buoyancy control can be injected into the channel (10), thereby greatly reducing the construction cost.

[Capillary evaporation-induced drainage material]

If the surface water and the pore water in the surface layer of the dredged soil dumping area in a sludge (glutinous, super soft) state are drained to the open channel (10) and the water collection and drainage material (40) and dried in the sun alone, it may be difficult to allow early entry of large heavy equipment for site development. In other words, although it is excellent compared to the past, the above-mentioned configuration alone cannot rule out the possibility of a collapse accident in the soft ground during construction due to insufficient ground strength for backfilling or equipment operation, and a considerable amount of construction time is still required, and more construction cost savings are required.

In particular, construction road areas where heavy construction equipment is to be driven require high ground strength. In order to secure the ground strength required for construction road areas along with the open channel (10) and the water collection and drainage material (40), the embodiment proposes a method of first intensively increasing the ground strength of the construction road area so that construction equipment can be deployed early.

In other words, by designating areas where heavy equipment needs to be deployed early as construction road areas, classifying other areas as general areas, and focusing ground improvement differentially on construction road areas, the construction heavy equipment can be used to improve general areas where ground improvement is not yet sufficient in the construction road areas.

In this way, the example promotes rapid deployment of heavy construction equipment required for soft ground reinforcement work, thereby eliminating the possibility of heavy equipment deployed first suffering a sinking accident in soft ground, shortening the construction period, and increasing the effect of reducing construction costs.

The example suggests a method for securing the strength of the ground for construction work in a short period of time at low cost by intensively increasing the ground strength in a designated construction road area, injecting highly absorbent, quick-drying materials (fibers, sponges, etc.) into the surface layer, while exposing some of them to the surface to induce a capillary phenomenon and cause a lot of evapotranspiration.

In the example, the capillary phenomenon occurs and evapotranspiration occurs rapidly and abundantly. The left and right sections of the canal are divided into a construction road area and a general area other than the construction road. Then, the capillary evapotranspiration-inducing drainage material (50, geosynthetics, etc.) of high-absorbent, quick-drying material is concentrated on the surface of the construction road area, penetrated at a certain depth, at a certain interval, and in a certain shape, and exposed on the surface.

Even in general areas, it is possible to inject highly absorbent, quick-drying materials at a certain depth, at certain intervals, and in a certain shape, and expose them on the surface. However, it is desirable to further increase the installation density of the highly absorbent, quick-drying materials so that the construction road area can secure ground strength first.

Specifically, considering the on-site conditions, construction period, current ground strength, and required ground strength, one or more I-shaped, L-shaped, or U-shaped capillary evaporation-inducing drainage materials (50) made of highly absorbent, quick-drying materials can be installed. Depending on the need, one capillary evaporation-inducing drainage material (50) can be used, or capillary evaporation-inducing drainage materials (50) of different shapes can be mixed and used.

The above capillary evaporation-induced drainage material (50) may have a shape such as a long strip, band, or belt, and its cross-sectional shape may vary.

The example exemplifies a form in which the central part of a pair of U-shaped capillary evaporation-induced drainage materials (50) overlapping in a '+' shape is buried by pressing against the lower part of a support stick (51), and the upper part exposed above the ground is tied to the upper part of the support stick (51) and fixed.

At this time, the capillary evaporation-induced drainage material (50) can be installed by wrapping the capillary evaporation-induced drainage material (50) in a rigid press-fitting mold (53) and pressing it together so that the gap between the capillary evaporation-induced drainage material (50) is maintained and buried, and then only the press-fitting mold (53) is pulled out and removed after pressing. The support stick (51) can be pressed in separately or together later.

By pressing in one U-shaped capillary evaporation-induced drainage material (50), the capillary evaporation-induced drainage material (50) can be installed in a '-' shape.

In this way, by injecting the capillary evaporation-induced drainage material (50) into the left and right surface of the channel (10) and exposing the upper part to the surface of the ground, high absorbency and evaporation are induced, thereby improving the drying speed and allowing rapid removal of pore water in the ground.

Rather than erecting the above capillary evaporation-inducing drainage material (50) high, it may be more advantageous to install it by bending it at a certain height to promote evaporation. This is because it takes into account the phenomenon that water that has risen by capillary phenomenon flows down from the bent part due to gravity. The capillary phenomenon utilizes the tension of liquid, but there is a limit to the capillary phenomenon overcoming gravity and rising. Therefore, if the part of the capillary evaporation-inducing drainage material (50) exposed to the ground is erected straight, the capillary phenomenon can no longer continue, and the rise of water due to the capillary phenomenon is prevented.

On the other hand, if a capillary evaporation-induced drainage material (50) is installed by bending at a certain height, water that has risen to a certain height will fall again and evaporate or fall to the ground surface, and through this cycle, the capillary phenomenon will continue to occur and promote evaporation.

Evapotranspiration occurs more when solar radiation is high, relative humidity is low, temperature is high, wind speed is fast, and the surface area of capillary evapotranspiration-induced drainage material is large.

Therefore, when the capillary evaporation-induced drainage material (50) exposed to the surface for ground pore water is fixed and erected by tying it to a support stick (51) made of wood, synthetic resin, etc., more evaporation occurs than when it is left lying on the ground surface.

In addition, rather than standing upright all the way to the tip of the capillary evaporation-induced drainage material (50), as explained above, bending it at a certain height so that the tip goes down continuously induces smooth capillary phenomenon, which can further increase the amount of evaporation.

In the area where the above capillary evaporation-induced drainage material (50) is installed, the pore water in the surface layer is quickly removed, so that the ground strength of the surface layer can be secured early.

Accordingly, in an area extending from the center of the canal where the construction road is to be installed in the width direction to a predetermined distance, the capillary evaporation-induced drainage material (50) is installed while being densely arranged. The predetermined distance may be about 5 m left and right, that is, about 10 m in total width. In general areas other than areas designated as construction roads, the material may be arranged and installed more sparsely. If the material is not installed in general areas at all, the pore water in the general area may move to the road construction area, thereby hindering the concentrated drying improvement effect. Therefore, it is preferable to install the capillary evaporation-induced drainage material (50) even in general areas.

For reference, the cross-sectional shapes of the capillary evaporation-induced drainage material (50) and the support stick (51) may be polygonal, circular, or oval, etc. For example, the cross-sectional shape of the support stick (51) may be modified in various ways as long as it has a structure that is advantageous in securing rigidity for pressing and standing. The cross-sectional shape of the capillary evaporation-induced drainage material (50) may also be changed in various ways as long as it can secure a tensile strength sufficient to prevent the phenomenon of breaking when pressing into the ground while increasing the surface area.

Meanwhile, referring to the drawing, both ends of the capillary evaporation-induced drainage material (50) can be sewn into a ring shape so that the ends of the capillary evaporation-induced drainage material (50) can be fitted or fixed during the process of installing and erecting the capillary evaporation-induced drainage material (50). The width of the ring should preferably be about 10 to 15 cm.

[Micro drainage]

When the clay on the seabed is disturbed to a state almost like mud and then dumped into a dredged soil dumping area using a pump dredger, the dredged soil dumping area is in a super-soft (sludge, mushy) state with almost no ground strength and the moisture content of the dredged soil is very high.

The pore water in the sand naturally drains out in a short period of time. However, the pore water in the dredged soil dumping area clay drains out to some extent near the side or bottom surface by simply installing a drainage channel (10) and drainage material (40), but it takes a long time for the entire water to drain out.

In the embodiment, as a means of rapidly draining the pore water in the ground around a channel to be used as a construction road, micro-drainage materials (60, geosynthetics, etc.) made of inexpensive, easy-to-construct, highly absorbent, quick-drying materials (fibers, sponges, etc.) are sewn longitudinally and transversely to connect them, and then, while again sewing them to the side and bottom surfaces of the channel (10), they are injected horizontally and vertically into the surface portion together with the channel (10).

The material of the above micro drainage material (60) is similar to that of the capillary evaporation-induced drainage material (50), and its shape is also similar, so a repeated description thereof will be omitted.

The above micro drainage material (60) can be divided into horizontal micro drainage material (601) and vertical micro drainage material (602) depending on the installation direction. This can be understood as being determined by the position of the channel (10) to which the micro drainage material (60) is connected by a seal or the like, and the direction in which the micro drainage material (60) extends from the channel (10), rather than the difference in the shape of the micro drainage material (60).

One longitudinal side of the micro drainage material (60) is connected to the permeable filter wall (12) of the water channel (10) by sewing, and the other side is formed into a ring (62) by sewing so that it can be inserted or fixed when installed and erected. In addition, additional drainage materials (63) that extend in the width direction intersecting the longitudinal direction are connected by sewing at multiple locations spaced apart from each other in the micro drainage material (60) that extends in the longitudinal direction.

The embodiment exemplifies a method of installing a plurality of such micro drainage materials (60) at regular intervals along the length of a water channel (10).

Specifically, in the embodiment, two horizontal micro-drainage materials (601) are installed on the left and right sides of the side of the channel (10) and installed at multiple locations at equal intervals along the length of the channel (10), thereby installing multiple horizontal micro-drainage materials. Of course, the horizontal micro-drainage materials may also be connected to the bottom surface of the channel (10).

In addition, the embodiment installs a pair of vertical micro-drainage materials (602) at both ends in the width direction of the bottom surface of the channel (10) and installs them at multiple locations at equal intervals along the length direction of the channel (10), thereby installing a plurality of vertical micro-drainage materials. Of course, the vertical micro-drainage materials may also be connected to the side surface of the channel (10).

Since the base portion of the above micro drainage material (60) is sewn and connected to the water channel (10), when burying the above micro drainage material (60), the water channel (10) to which the base portion of the micro drainage material (60) is connected is buried, and the ring portion provided at the tip portion of the micro drainage material (60) is pressed into the ground while being hung with the end portion of a long stick with a bent end.

When the micro-drainage material (60) is pressed into the channel (10) in this way, the ground pore water flows in from each part of the micro-drainage material that is sewn together and can be drained into the channel (10) through the micro-drainage material (60). Since the micro-drainage material (60) is connected to the channel (10), the ground pore water on both sides and the lower side of the channel (10) in the width direction can quickly flow into the channel (10) through the micro-drainage material (60). Accordingly, the ground strength of the road area under construction can be quickly improved, thereby shortening the construction period with low construction costs.

[Recovery]

The general construction sequence of a dredged soil dumping site is as follows: 1) embankment construction, 2) dumping of dredged soil, 3) abandonment, 4) surface drying or ground reinforcement (using geosynthetics, bamboo mats, etc.) or surface solidification, 5) backfilling, 6) pouring of vertical drainage material, and 7) refilling.

The dredged soil dump site has very soft ground, making it very difficult to access equipment, transport backfill materials, and reloading materials. If construction is carried out while the ground strength is insufficient, there is a risk of serious disasters such as lateral movement of the ground or subsidence during construction.

By carrying out backfilling, construction can be carried out more safely. Through this backfilling, the ground support capacity can be secured to enable the operation of large heavy equipment and the operation of large cranes for vertical drainage material pouring.

The total height of the general backfill is approximately 0.3 to 3.0 m, and the height of the first layer of backfill is 0.3 to 3.0 m depending on the strength of the soft ground. Backfill is done in one or two layers, and is repeated according to the backfill height and backfill width. The main materials for backfill are sand or crushed stone.

The conventional backfill method was to dump dredged soil, leave the dumping site naturally for a long period of time, and then begin backfilling. However, even if the surface water dries in the sunlight under the natural leftover condition, there was a problem that the surface water would fill up again if it rained once. If the surface water is left for a long period of time like this, harmful insects can appear or run rampant, which can cause complaints from nearby residents, and it can have a negative impact on the environment because large amounts of toxic chemicals must be sprayed over a long period of time to exterminate harmful insects.

In addition, according to the conventional backfill method, backfilling is carried out when the ground strength is insufficient, so the ground reinforcement and construction costs are high, the construction period is long due to the insufficient ground strength, and since the ground reinforcement material is laid on the water using barges, the construction cost is even higher and the construction period is even longer. In addition, since there is no separate road for construction, the construction cost is even higher and construction management is difficult.

In addition, since the conventional backfill method continuously backfills from the start to the end area, there is a risk of major disasters such as lateral movement of soft ground and ground destruction during construction, and there is a risk of construction delays or increased construction costs.

According to an embodiment, after surface drying is completed through a surface drying method of a dredged soil dumping site using the previously described water channel (10), water collection drainage material (40), a rigid perforated pipe drainage material (30), a capillary evaporation-induced drainage material (50), and a micro drainage material (60), a backfilling method according to the present invention can be applied.

According to the backfill method of the example, first, ground reinforcing materials (geosynthetics, bamboo mats, etc.) are laid on the surface of the dredged soil dump site.

Next, in the upper area of the ground reinforcement material laid on the canal (10) and its left and right surroundings, which is the scheduled construction road area, the backfill material is transported, unloaded, and stopped in a balanced manner on the canal (10) and its left and right areas, and multiple construction roads (71) of the required width are constructed with the construction materials spaced apart from each other in the width direction.

The backfill material (74) is transported through the constructed construction road (71), and after the backfill material (74) is unloaded near the width-wise edge of the construction road (71), the backfill material (74) is pushed in with a stationary device to approximately the midpoint with the neighboring construction road (71) to perform the first backfill (72).

Likewise, at the edge of the construction road (71) being backfilled and the edge of another construction road (71) adjacent to it, backfill material (74) is transported through the construction road (71) in the same manner as described above, and the backfill material (74) is unloaded near the widthwise edge facing the construction road (71) described above on the construction road (71), and then the backfill material (74) is pushed in by a stationary device to approximately the midpoint with the neighboring construction road (71) to perform a second backfill (73), thereby connecting the two construction roads (71) in the widthwise direction.

In addition, the above-mentioned backfill work is carried out continuously, repeatedly and sequentially up to the width of the dredged soil dumping area and the required backfill height.

Although the present invention has been described with reference to the drawings as examples, it is obvious that the present invention is not limited to the embodiments and drawings disclosed in this specification, and that various modifications can be made by those skilled in the art within the scope of the technical idea of the present invention. In addition, even if the effects according to the configuration of the present invention were not explicitly described while describing the embodiments of the present invention, it is natural that the effects that can be predicted by the corresponding configuration should also be recognized.

1 Super soft ground
2: Ground
3: Surface water
4: Sleep
5: Hoan
6: Seawater
7: Ground
10: By number
11: Mesh skeleton
12: Pitcher filter wall
13: Surface water permeation hole
14: Weight for buoyancy control
15: Absence of pitcher
16: Yugongwan
17: Drainage space
20: The catch basin
22: Drainage pump
30: Gangseong Yugongwan drainage material
31: Kang Sung-yoo's Public Office
32: Pitcher filter material
40: Drainage catch basin
41: Drainage core material
42: Permeable filter material
50: Capillary evaporation-induced drainage
51: Support Stick
52: Pressure-permeable filter material
53: Pressing mold
60: Micro drainage
601: Horizontal Micro Drain
602: Vertical Micro Drain
62: Ring
63: Additional drainage
71: Road for construction
72: First restoration
73: Second restoration
74: Recycling

Claims (10)

A plurality of channels (10) having a mesh-shaped frame (11) and a water-permeable filter wall (12) covering the surface of the mesh-shaped frame, and extending long in a first direction and embedded in an ultra-soft ground, but spaced apart from each other in a second direction intersecting the first direction;
A plurality of rigid perforated pipe drainage materials (30) connected to the bottom surface of the plurality of above-mentioned channels (10), extending in the second direction, and spaced apart from each other in the first direction; and
A surface drying facility including a water collection and drainage material (40) connecting a plurality of the above-mentioned water channels (10);
The above rigid water-absorbing pipe drainage material (30) is:
A plurality of rigid perforated pipes (31) arranged to extend in the second direction from the lower portion of each of the above-mentioned numbers (10), but spaced apart in the first direction; and
It includes a plurality of permeable filter materials (32) that extend in the second direction and are sewn to the permeable filter wall (12) of the bottom surface of each of the above channels (10), and are spaced apart in the first direction so that the rigid perforated tube (31) passes through and is received;
The above water collection and drainage material (40) penetrates a plurality of the above rigid perforated pipes (31) aligned in the second direction,
The above-mentioned pitcher filter material (32) extends longer in the second direction than the above-mentioned rigid perforated tube (31),
A surface drying facility in which both ends of the above rigid perforated pipe (31) are finished by wrapping the end of the above water permeable filter material (32) longer than the above rigid perforated pipe (31) around the above water collection and drainage material (40).
In claim 1,
The above water collection and drainage material (40) is:
A water collection core material (41) extending in the second direction; and
A surface drying facility including a permeable filter material (42) surrounding the above-mentioned water collection core material (41).
In claim 1,
A surface drying facility further comprising a capillary evaporation-induced drainage material (50) which is installed buried in a plurality of locations spaced apart from each other in the first direction and the second direction in a first area of ultra-soft ground extending a predetermined distance in the second direction from both sides of the width direction of the above-mentioned waterway (10), and whose upper end is exposed above the surface of the ultra-soft ground.
In claim 3,
A surface drying facility of a dredged soil dumping site, in which the installation density of the capillary evaporation-induced drainage material (50) installed in the first area above is higher than the installation density of the capillary evaporation-induced drainage material (50) installed in the second area other than the first area above.
In claim 3,
The above capillary evaporation-induced drainage material (50) is:
A pressurized permeable filter material (52) whose lower part is buried in the ground of the above-mentioned ultra-soft ground and whose upper part is exposed to the upper surface of the above-mentioned ultra-soft ground; and
It includes a support stick (51) that is pressed in together with the press-fit position of the above press-fit permeable filter material (52);
A surface drying facility, wherein the above-mentioned pressurized permeable filter material (52) extends upward from the surface and is fixed to the support stick (51), and the tip of the above-mentioned pressurized permeable filter material (52) is positioned lower than the fixing portion of the above-mentioned support stick (51).
In claim 1,
A surface drying facility of a dredged soil dumping site, comprising a micro drainage material (60) connected to a permeable filter wall (12) of the above-mentioned channel (10), extending in a direction away from the above-mentioned channel (10), and embedded in the above-mentioned ultra-soft ground.
In claim 6,
The above micro drainage material (60) is a surface drying facility in which the longitudinal end is sewn and connected to the permeable filter wall (12) of the water channel (10), and additional drainage materials (63) extending to both sides in the width direction are sewn and connected at multiple locations along the longitudinal direction, and the tip end is sewn in the shape of a ring (62).
In claim 6,
The above micro-drainage material (60) is a surface drying facility including at least one of a horizontal micro-drainage material (601) that is embedded so as to be connected to the side surface or bottom surface of the water channel (10) and extend laterally outward, and a vertical micro-drainage material (602) that is embedded so as to be connected to the bottom surface or side surface of the water channel (10) and extend downward.
A surface drying method for drying a surface by constructing a surface drying facility according to any one of claims 1 to 8 in a dredged soil dumping site.
As a method of backfilling a dredged soil dump site,
A drying step of drying the surface layer of a dredged soil dumping site using the surface drying method of claim 9;
The laying stage of laying ground reinforcement material on the surface of the dredged soil dumping area;
A construction road construction step in which a plurality of construction roads are constructed by transporting, unloading, and stopping the backfill material in the upper area of the ground reinforcement material of the first area of the above-mentioned waterway (10) and its left and right surroundings, and by placing a plurality of construction roads spaced apart from each other in the width direction;
The first backfilling stage involves transporting backfill materials through the above construction road, unloading the backfill materials near the width-wise edge of the above construction road, and then pushing the backfill materials into the approximate midpoint with respect to another adjacent construction road using leveling equipment and backfilling;
A second backfilling step of transporting backfill materials through the other construction road, unloading the backfill materials near the edge of the other construction road adjacent to the edge of the other construction road, and then pushing the backfill materials into the approximate midpoint of the other construction road adjacent to the backfilling road with a leveling device to connect the two construction roads in the width direction; and
A method for backfilling a dredged soil dump site, comprising: repeating the above-mentioned construction road construction step, the first backfill step, and the second backfill step according to backfill height and backfill width.