KR101033197B1 - Improvement surface processing method of construction of the very soft ground - Google Patents

Abstract

The present invention relates to an ultra soft ground improved surface treatment method for improving the upper surface layer of landfills formed by buried with marine clay of the seabed, wherein hot wires are arranged on the upper surface layer of the landfill so as to be spaced apart from each other by a predetermined interval and depth. Hot wire arrangement step; And a heat supply step of supplying heat to the hot wire so that the upper surface layer is dried. According to the present invention, it is an object of the present invention to provide an ultra soft ground improvement method that is environmentally friendly and is not affected by the weather and can be quickly and reduce the high quality ground improvement effect and construction cost of landfills.

Description

Improving surface processing method of construction of the very soft ground}

The present invention relates to a super soft ground surface treatment method for improving the reclaimed land, which is a super soft ground created by dumping the marine dredged soil of the seabed to a level where heavy equipment can work.

In order to efficiently utilize the land, Korea developed and developed the west and south coasts into new industrial areas in the 2000s to develop lands through coastal reclamation to meet the growing demand for industrial and residential lands, airports, and ports. It is actively promoting.

In the early stages of coastal reclamation in Korea, crushed rocks and soil were used as landfill materials. However, as the reclamation work becomes more active, the amount of collected soil for high quality soil can be limited. It is becoming.

In order to construct a site using the marine dredged soil obtained by dredging the seabed, the following steps are usually carried out. ① Dividing the landfill section by constructing the revetment and containment dyke, ② Landfill by dredging clay using a pump dredger, ③ Remove the free water during dredging landfill, ④ Self-consolidation After some progress, the super soft ground is exposed to the upper surface of the water, ⑤ Laying the ground reinforcing mat and send mat after leaving, and drainage construction (can be omitted depending on site conditions), ⑥ Complex plan and residual settlement Review your cover with Santo.

The present invention relates to the improvement of the upper surface layer to enable the running of construction equipment, the landfill in the ultra soft ground state of the various steps.

The super soft ground landfill is formed by dredged soil, which is mixed with water and dumped into the landfill, and enters the self-consolidation state which depends only on the self-weight of the granules through the coagulation, sedimentation and sedimentation stages. At this time, there is no effective stress, so it is impossible for a person to walk or enter the equipment. Self-consolidation, which relies solely on the self-weight of the cultivator, takes too long to change into a state where humans can walk or enter heavy equipment. Therefore, it is very important in terms of time and economics.

In order to improve such an upper surface layer, various things have conventionally been used, and the following method is typically used.

First, there is an ultra soft ground surface solidification method. This is a chemical soil stabilization method that mixes and stirs a special solidifying agent on an ultra soft ground composed of high-functional viscous soils and improves it into a hard ground having a predetermined strength.The surface layer of soft ground such as reclaimed land, dredged landfill or inland is It is a technology that can be improved by solidifying treatment to high quality ground having a predetermined bearing capacity and aqueous property.

Next, there is a Progressive Trenching Method (PTM) of super soft ground through the staged composition of the drainage network. This method is a surface drying treatment method using the Progressive Trenching Method (PTM), and dredging is made only with marine clay (dredged soil) without using sea sand or terrestrial soil, and then heavy equipment can work on the super soft ground. It is the construction method to treat at the level.

This method gradually forms trenches in the upper surface layer, inducing surface drainage and groundwater level reduction, forming a surface dry layer, and increasing the thickness of the surface dry layer by adjusting the depth and spacing of the trenches. It is a method to secure ground support for the process and trafficability of construction equipment, and is used for large-scale dredging reclamation work and surface dry processing of super soft ground with high water content.

Next, there is a basic treatment method of the ultra soft ground revetment and temporary road using a bamboo mat. This method installs a bamboo mat under the soil structure under the structure of the soil, which is designed to maximize the rigidity of the bamboo through the basic treatment design and construction technology of the coastal and temporary roads constructed on the ultra soft ground. It is a foundation method on the super soft ground that is distributed evenly on the lower ground to build a stable fill structure at the minimum depth of substitution.

However, the conventional techniques have the following problems.

In other words, in the super soft ground surface solidification method, a chemical solidifying agent should be used. The solidifying agent is not only expensive but also fluctuates due to the fluctuation of crude oil price, and special care is required during construction. The problem is that it is harmful to the environment and adversely affects the environment.

In addition, the Progressive Trenching Method (PTM) of super soft ground through the gradation of drainage network can be delayed due to the influence of climate, and the deeper the depth, the lower the effect. There is a problem such as stopping the surface after improvement.

In addition, the basic treatment method of the ultra soft ground revetment and temporary road using the bamboo mat takes a lot of time in the installation, and when the soil and sand is deposited on the upper part at once, due to frequent opening of the bar or dismantling of the bamboo joint , Lateral flows are excessively generated due to concentrated loads, so the indentation of the fill is large, and the uneven soil is large, resulting in ground breakage and uplift plastic flow, which causes frequent delays in construction and incurs air delays. have.

The present invention, in order to solve the above problems, environmentally friendly, ultra-soft ground improvement method that can obtain a high quality ground improvement effect quickly, without significantly affected by the weather, and also can reduce the construction cost The purpose is to provide.

In order to achieve the above technical problem, the present invention is a super soft ground improved surface treatment method using a hot wire, in order to improve the upper surface layer of the landfill formed by buried with the marine clay of the seabed, in the upper surface layer of the landfill, a predetermined distance from each other Hot wire arrangement step of placing the hot wire to be spaced apart; And a heat supply step of supplying heat to the hot wire to dry the upper surface layer.

On the other hand, the heating wire is a pipe in the form of a pipe, the working fluid circulates in the inside of the heating wire, the access path close to the landfill, the heat supply device for heating the working fluid and a pump for circulating the working fluid includes It is preferable.

The hot wires are preferably spaced apart from each other by 0.2 m to 1.5 m over the entire surface of the upper surface layer, and both ends of the hot wires are connected to a heat supply device located in an access path close to the landfill.

On the other hand, the upper surface layer is a layer within a depth of 2m from the surface of the landfill, and the heating wire is disposed inside the upper surface layer, extending from the upper side to the lower side of the upper surface layer, and extending from the lower side to the upper side again. It is preferable to arrange repeatedly.

In addition, both ends of the heating wire is connected to a power supply located in an access path close to the landfill, the heating wire is preferably configured to generate heat by receiving electricity from the power supply.

In the heat supply step, it is preferable to repeat the supply of heat to the hot wire for a predetermined time and to stop the heat supply for a predetermined time.

On the other hand, in the heating wire arrangement step, it is preferable to support the heating wire to the support ship that can be supported on the surface of the landfill at predetermined intervals.

And, in the heat supply step, it is preferable to dry the upper surface layer to a dry surface layer of the level that can proceed and mount the equipment having a ground pressure of 2 ~ 12 kgf / cm2.

According to the super soft ground improved surface treatment method using the hot wire of the present invention, the super soft ground surface layer of the landfill where dredged landfilling was carried out with only the marine clay (the marine clay generated during the dredging route) to the level that the equipment can work By making it possible to process within the landfill, the supply and demand of landfill materials is stable and economical, and the effect of minimizing the use of heavy intestines and natural destruction can be minimized by minimizing the landfill facility.

In addition, by using the hot wire to evaporate the water between the particles of the ultra-soft ground to obtain a predetermined ground strength, there is an effect that it is possible to minimize the natural effects such as sunshine or temperature. In addition, it is possible to arrange the hot wires at predetermined intervals and depths, and thus there is an effect that uniform and reliable surface layer processing is possible.

Hereinafter, with reference to the accompanying drawings, the super-soft ground improved surface treatment method using a hot wire of a preferred embodiment according to the present invention will be described in detail.

FIG. 1 is a schematic cross-sectional view of a landfill which is surrounded by a lake and a ground, and is made of dumped marine clay, and FIG. 2 is a plan view showing the topography of FIG.

3-7 is a figure for demonstrating installing a heating wire in the landfill of FIG.

The super soft ground improved surface treatment method using the hot wire of the embodiment according to the present invention, the super soft ground improved surface treatment method for improving the upper surface layer of the landfill 10 formed by buried with the marine clay of the sea bottom of the sea 40 As a heat wire 50 arrangement step and a heat supply step for supplying heat to the heat wire 50 comprises. The landfill 10 is surrounded by a raft 20 and a base 30.

The hot wire arrangement step is to arrange the hot wire 50 on the upper surface layer of the landfill 10 so as to be spaced apart from each other by a predetermined interval.

In the present embodiment, the hot wire 50 is a pipe in the form of a tube. Made of a material such as PVC, it is an elastic pipe that can be bent as needed with a certain degree of rigidity. However, it is not necessary that all of the arranged heating wires are made of the same material, and heating wires that are more rigidly required, for example, heating wires located at the rightmost side in FIG. 7 may be made of a light metal such as aluminum, It may be made of a material such as plastic.

The working fluid circulates inside the hot wire 50. The working fluid is appropriately selected from materials capable of transferring heat. At this time, it is preferable to consider the material of the hot wire. Water is used in this embodiment.

The hot wire 50 is disposed on the upper surface layer of the landfill 10. In this case, the upper surface layer means a layer within 2 m depth from the surface of the landfill. This is usually when a layer of about 2m depth from the surface is dried to a certain degree, various equipment and manpower for additional improvement work on the upper surface layer can enter. However, in the present invention, the thickness of the upper surface layer is not limited to 2 m.

On the other hand, in the present embodiment, the hot wire 50 is disposed inside the upper surface layer, and it is preferable that the heating wire 50 is repeatedly arranged to extend from the upper side to the lower side and again from the lower side to the upper side.

That is, in arranging the heating wire 50 in the upper surface layer, the heating wire that has been disposed on the upper surface layer looks like a straight line when viewed from the top view as shown in FIG. 7, but when viewed from the side view as shown in FIG. It is arranged as such.

Thus, a portion of the hot wire is arranged to be close to the surface of the upper surface layer, and the other portion is to be disposed below the upper surface layer. This structure is a structure for advancing the upper surface layer more effectively and maintaining the improvement depth at a predetermined planned depth.

As one method for arranging the heating wire 50 as described above, in fixing the heating wire 50 to the flotation line 60, the heating wire 50 is fixed in close proximity to one support line, and the next support line The heating wire 50 may be fixed at a predetermined depth of the upper surface layer so that the heating wire 50 may have a wavy shape as a whole.

On the other hand, in the present embodiment, the arranged heating wires 50 are arranged to maintain approximately 1 m around (0.8 to 1.2 m) with respect to the entire area of the upper surface layer of the landfill 10.

However, the spacing interval of the heating wire is 0.2m to 1.5m in consideration of the specific condition of the marine clay constituting the landfill, the desired period of improvement completion, the diameter of the arranged heating wire, and the temperature of the working fluid supplied. It is preferable to select suitably within. If it is smaller than the raised range, there is a problem that too much material is required for the placement of the heating wire, and if it is large, there is a problem that the drying speed of the landfill is too slow.

On the other hand, in the present invention, that the hot wires are spaced apart from each other by a predetermined interval means that not only the horizontal distance shown in the plan view, but also a predetermined distance in three dimensions. That is, it is desirable to consider both the placement depth and the transverse spacing of the hot wires so that the hot wires can be evenly distributed over the entire upper surface layer.

In addition, in the present invention, in order to arrange the heating wires at a predetermined interval, the supporting wires 60 are supported on the surface of the landfill.

Referring to FIGS. 9 (top view) and 10 (front view), which exemplarily show a floatation line supporting an intermediate portion rather than both sides of the arranged heating line, the floatation line 60 passes through the heating line at both lower ends thereof. It is a structure that can support hot wire at the same time. In addition, by connecting the wire extending to the upper end of the flotation line by hanging the heating wire, the supported heating wire can be fixed so as not to move or can be slidably supported.

In addition, if the heating wire is to be kept spaced downward from the flotation line to the desired degree (that is, to place the heating wire under the upper surface layer), the connecting line may be extended downward as desired.

In other words, by using the flotation line 60, the heating wire may be maintained at a constant horizontal interval, and at the same time, it may be arranged and maintained at a desired depth. The flotation line 60 serves as a depth maintaining device at the same time as the horizontal space keeping device. However, the flotation vessel employed in the present invention is not limited to the above-described configuration, and may be modified into various configurations that achieve the same purpose. In addition, the depth holding device may be provided separately.

On the other hand, the specific example of arranging a heating wire as a temporary example of the present invention will be described.

In FIG. 3, the heating wire 50 is supported on the flotation line 60, and is pushed into the landfill 10 as indicated by the arrow indicated. As the heating wire 50 proceeds, the support line is additionally supported at every necessary interval.

FIG. 4 is a view illustrating a state where the arrangement of one hot wire 50 is completed, and FIG. 5 is a diagram illustrating that the additional hot wire 50 is pushed by using the hot wire that has been arranged first. 6 shows a state where the arrangement of two hot wires is completed. By repeating this process, the arrangement of the hot wires is shown in FIG. 7.

On the other hand, when explaining the meaning of "○" and "X" displayed on the flotation line, the indication of "○" means that the heating wire is slidably supported at the lower end of the flotation line, and the indication of "×" indicates that the heating line is floated. It means that it is fixed to the bottom of the line to prevent movement.

However, the present invention is not limited to the illustrated embodiment and may be variously modified. For example, after the completion of the mutual arrangement of hot wires on the ground or on the access road, the hot wires can be placed on the landfill by pushing them into the landfill as a whole.

Alternatively, in the exemplary embodiment illustrated in FIG. 7, a plurality of heating wires are interconnected by a flotation line, but in another embodiment, separate support lines are arranged in one heating line, and separate supporters are arranged in another heating line. It is also possible to push the hot wire combined with the flotation line as a unit to the desired location of the landfill.

The hot wire supply step, which is performed after the placement of the hot wire is completed, is a step of supplying heat to the hot wire 50 so that the upper surface layer of the landfill 10 is dried.

In order to supply heat to the hot wire, the present embodiment includes a heat supply device for heating the working fluid and a pump for circulating the working fluid in an approach path close to the landfill. In addition, it is preferable to include a storage tank capable of supplying a working fluid to the hot wire.

An access road close to a landfill means a part of a base that can be accessed by equipment or personnel to assemble a heating wire. In this approach, the installation of a device for supplying heat to the heating wire is also performed.

In FIG. 8, it is conceptually shown that the storage tank 80 including the heat supply device 70 and the pump is connected to the heating wire 50. As a heat supply device 70, a boiler is used, and an outlet line 52 and an inlet line 54 are connected to the boiler, and both ends of each heating line are connected to the outlet line and the inlet line 54.

Therefore, the heating wire is supplied with a working fluid heated in the boiler, and the supplied fluid heats around the heating wire while rotating the heating wire. The heated portion is gradually dried and improved. The cooled fluid enters the boiler again and is heated, and this circulation is repeated.

This heat supply step is carried out until the top surface is dried to a level of drying surface at which the equipment can proceed and mount with a ground pressure of 2 to 12 kgf / cm2.

Equipment with a ground pressure of 2 to 12 kgf / cm2 is intended for subsequent processing after the top layer improvement. However, the desired dryness can be adjusted as needed.

On the other hand, in the heat supply step, after the heat supply to the heating wire for a predetermined time may be repeated to stop the heat supply for a predetermined time. This is because the intermittent supply of heat to the hot wire can reduce the cost for the boiler without significantly affecting the effect of drying the upper surface layer compared with the continuous supply.

On the other hand, in the present embodiment, as a configuration for supplying heat to the heating wire, it was exemplified as including a tank including a pipe heating wire, a working fluid, a boiler and a pump for heating it, but the present invention is not limited thereto. .

That is, the heat supply device is a power supply capable of supplying electricity, and the heating wire may be a resistance wire capable of generating heat by receiving electricity from the power supply device. This configuration eliminates the need for a pump and a tank, and the arrangement of the heating wire and the connection of the heating wire and the power supply may be simple.

According to the ultra-soft ground improved surface treatment method using the heating wire of the present invention having the above-described configuration, the following effects are obtained.

In the super soft ground improved surface treatment method using the hot wire of the present invention, the equipment can work the super soft ground surface layer of the landfill where dredged landfilling is carried out only with sea clay (sea clay produced during dredging) without using sea sand or land soil. As a process that can be processed in the shortest possible time, the supply and demand of landfills is stable and economical, and it has the advantage of being an environmentally friendly method that minimizes the use of heavy costs and natural destruction by minimizing the landfill facility.

In addition, by using a hot wire it is possible to minimize the natural effects such as the amount of sunshine and temperature required to evaporate the water between the particles of the ultra-soft ground to obtain a predetermined ground strength effect. In addition, hot wires can be arranged at predetermined intervals and depths, thereby enabling uniform and reliable surface treatment (fastness and reliability).

In addition, as a homogeneous surface treatment becomes possible, problems such as settlement and ridge due to uneven distribution can be minimized even in the staged filling after surface stabilization treatment, thereby minimizing the use of high quality fill materials such as sand (economical efficiency). ).

In addition, development of a heat supply device having excellent thermal efficiency enables rapid and accurate surface treatment with minimal energy (fastness and reliability).

When using a heat supply device using natural energy, it can double the environmentally friendly characteristics, and minimize industrial waste by recovering the installed heating wires, the depth of the heating wires, and the space keeping device after surface treatment (eco-friendliness).

Most of the processes are simple, such as the arrangement of hot wires and the connection to the heat supply, so the use of heavy equipment is small, minimizing the risk of safety accidents and catastrophic events (safety).

1 is a schematic cross-sectional view of a reclaimed land surrounded by a lake and a base, and is made by dumping marine clay of the seabed;

FIG. 2 is a plan view from above of the terrain of FIG. 1, conceptually illustrating this; FIG.

3 to 7 are views for explaining the installation of a heating wire in the landfill of FIG.

8 is a conceptual view showing that a heating wire is disposed in a landfill of FIG. 2, and a working fluid and a heat supply device are connected to the heating wire.

9 is a schematic plan view of the support ship provided in FIG. 8,

10 is a schematic front view of the flotation of FIG.

Claims (8)

As an ultra soft ground improved surface treatment method to improve the upper surface layer of landfill formed by being made of marine clay of seabed, A hot wire arrangement step of disposing hot wires on the upper surface layer of the landfill to be spaced apart from each other by a predetermined interval; And Ultra-soft ground improved surface treatment method using a hot wire characterized in that it comprises a heat supply step for supplying heat to the hot wire to dry the upper surface layer. The method of claim 1, The heating wire is a tubular pipe, The working fluid circulates inside the heating wire, An approach surface close to the landfill, the super soft ground improved surface treatment method using a heating wire, characterized in that it comprises a heat supply device for heating the working fluid and a pump for circulating the working fluid. The method of claim 2, The hot wires are arranged to be spaced apart from each other by 0.2 m to 1.5 m over the entire area of the upper surface layer, Both ends of the heating wire is connected to a heat supply device located in an access path close to the landfill, super soft ground improved surface treatment method using a heating wire. The method of claim 1, The upper surface layer is a layer within 2 m depth from the surface of the landfill, The hot wire is disposed in the upper surface layer, the super soft ground improved surface treatment method using a hot wire, characterized in that it is arranged to extend from the upper side to the lower side of the upper surface layer to extend again from the lower side toward the upper side. The method of claim 1, Both ends of the heating wire is connected to a power supply located in an access path close to the landfill, The hot wire is a super soft ground improved surface treatment method using a hot wire, characterized in that to generate heat by receiving electricity from the power supply. The method of claim 1, The heat supply step, The super soft ground improved surface treatment method using a hot wire, characterized in that to repeat the heat supply for a predetermined time after the heat supply to the hot wire for a predetermined time. The method of claim 1, The hot wire arrangement step, The super soft ground improved surface layer treatment method using a hot wire, characterized in that for supporting the hot wire to a support ship that can be supported on the surface of the landfill at predetermined intervals. The method of claim 1, The heat supply step, The super soft ground improved surface treatment method using a hot wire, characterized in that for drying the upper surface layer to a dry surface layer that can be carried out and mounted equipment of ground pressure 2 ~ 12 kgf / cm2.

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