KR20040104433A - Soft Ground Improvement System and improvement method - Google Patents

Abstract

PURPOSE: A device for improving the sea bed soft ground and a method thereof are provided to reduce the construction period by constructing the column to the extension line with pile-driving, and to enhance the safety of the soft ground by forming the latticed concrete wall column in the soft ground. CONSTITUTION: A front column(110) is vertically formed and protruded forward in a soft ground improving device(100), and a cylinder support column is vertically and integrally formed in the rear part of the front column. Cylinders(121) are arranged vertically in the rear part of the cylinder support column, and a hydraulic pipe(122) is connected to the cylinder. The cylinder is connected to a piston(141), and integrally formed with a piston support column(140). Side wall columns(130) are formed at both sides of the piston support column and connected to the cylinder support column and the front column to surround the cylinder, the piston and the piston support column. A lower plate is formed to the back of the piston support column in the lower part of the soft ground improving device in pushing the piston with hydraulic pressure of the cylinder.

Description

Soft Ground Improvement System and improvement method

The necessity of developing coasts under the natural conditions of Korea, where the land is narrow and the sea on three sides, is gradually increasing, and industrial complexes and various port facilities are being built by developing coasts. Therefore, the saddle treatment of the soft ground is required in the process of development through coastal reclamation. The representative method is sand compaction pile developed in Japan in the 1950s, and its use is frequently used.

This sand compaction pile method is a marine soft ground improvement method that presses sand or similar material into sand of soft soil or coarse soil to form a compacted sand pile of large diameter. It is used for the purpose of increasing the bearing capacity, reducing the compression settlement, preventing liquefaction, and the horizontal decrease by forming sand pillars in the soft ground. Marine pollution caused by economical design of structures and construction of other construction methods such as forced substitution method by indentation. It is to minimize the soil treatment.

The construction method of the sand compaction pile method comprises the steps of first fixing the equipment in the construction position and confirming the construction position and operation state; Operating the vibratory hammer to insert the casing to the design depth or support layer and to inject sand into the casing; Operating a hammer with a compressed air injection vibrator in the casing and drawing it by a predetermined length to form a sand column, such as a casing cross-sectional area; Closing the compressed air valve and operating the hammer with a vibrator to compress the sand column by a predetermined length; Repeating forming the sand column equal to the casing cross-sectional area while operating the hammer with the compressed air injection vibrator in the casing again when the indentation is complete; The compressed air valve is closed and the vibrator is operated to repeatedly compress the sand column by a predetermined length while repeatedly forming the sand column in the subsea soft ground.

The sand compaction pile method repeatedly forms the sand pillars on the sea soft ground at regular intervals and shapes while repeatedly repeating the above processes. As described above, in order to form one sand pillar, the driving and drawing of the casing is repeatedly performed. Not only does this prolong the construction period, but it is also difficult to construct precise specifications. In addition, the main facilities such as the quay have a problem that can not effectively cope with the horizontal stress caused by the arc activity due to the pressure of the backfilling of the quay.

1 is a partial cutaway perspective view of the soft ground improvement device of the present invention

Figure 2 is a plan view of the soft ground improvement device of the present invention

Figure 3 is a cross-sectional view of the soft ground improvement device of the present invention

4 is a construction flowchart showing a method for improving soft ground using the soft ground improving apparatus of the present invention.

5 is a plan view showing a soft ground improvement method using the soft ground improvement apparatus of the present invention.

<Name of Main Parts of Drawing>

100. Improvement device 110. Front pillar

120. Cylinder support pillar 121. Cylinder

122. Hydraulic Pipe 130. Both Side Wall Columns

140. Piston Support Column 141. Piston

142. Back of piston support post 150. Bottom plate

200. Soft ground 210. Space

220. Sand 230. Substitutions

300. Farmland

In order to efficiently overcome the above problems, the soft ground improvement device and the improvement method will be described in detail with reference to the drawings as a method for continuously forming sand wall pillars in the sea soft ground.

First, Figure 1 is a partially cut perspective view of the soft ground improvement device of the present invention the device 100 is made of a solid steel material. Looking at the configuration is improved device 100 is made of a vertical front pillar 110 protruding at a predetermined angle toward the front. At the rear of the front column 110, the cylinder support column 120 is also formed vertically integrally with the front column 110, the cylinder 121 is arranged up and down at regular intervals on the back of the cylinder support column 120 Is arranged. At this time, the cylinder 121 is installed through the dynamic adjustment of the arrangement interval in order to constantly advance the improved device 100 by the uniform force in the interior of the soft ground offshore 200. The cylinder support pillar 120 and the cylinder 121 are, of course, integrally formed, and the cylinder support pillar 120 has a hydraulic pipe 122 for operating hydraulic pressure inside the cylinder 121 and connected to each cylinder 121. have.

Piston 141 is connected to each of the cylinder 121, and the piston support pillar 140 integrally with the piston 141 is also formed vertically in the form of a constant wall.

Both side wall pillars 130 are integrally connected to both the front pillar 110 and the cylinder support pillar 120 at both sides of the piston support pillar 140 to be in contact with both ends of the piston support pillar 140. Piston support pillar 140 is a side support for the piston 141 to repeat the front and rear movement with the piston support pillar 140 by the hydraulic pressure of the cylinder 121.

The lower part of the improvement apparatus 100 is formed with a lower plate 150 connecting the lower part of the front column 120 and the lower part of both side wall pillars 130, and the front and rear lengths of the lower plate 150 are the front column 110. When the piston 141 is pushed to the maximum by the hydraulic pressure from the cylinder 121, the piston support pillar is formed to the rear surface 142, even if the improvement device 100 is driven into the marine soft ground 200, the cylinder 121 or The piston 141 serves to prevent the flow of soil of the soft ground 200 flows.

The improvement method of the marine soft ground 200 using this improvement apparatus 100 is demonstrated based on the construction flowchart which shows the soft ground improvement method using the soft ground improvement apparatus of FIG. 4 as follows.

The position of the marine soft ground 200 to be improved is selected, and the apparatus 100 is driven into the hard soft ground 300 by using the marine crane in the marine soft ground 200.

Although not shown in the drawings, the hydraulic pipe 122 of the retrofit apparatus 100 is connected to the hydraulic system of the ship on the sea surface of the sea, and the retrofit device 100 easily advances in the sea soft ground 200. It will be mentioned that the device is mounted on the retrofit device 100 as a hydraulic vibrating rocking the retrofit device 100 in order to.

When the retrofit device 100 is incorporated in the marine soft ground 200. First, as shown in FIG. 4A, when each piston 141 is advanced in the direction of the arrow with the hydraulic force inside each cylinder 121, as shown in FIG. 4B, the piston support pillar 140 is advanced in the direction of the arrow. The space 210 is formed on the rear surface of the piston support pillar 142. The casing installed on the work line in which the sand 220 is loaded on the sea surface in the space 210 is pressurized to the sand 220 from the lower plate 150 of the retrofit device 100 to improve the space of the retrofit device 100. The sand 220 is consolidated to the upper portion of the 210 to form a substitute 230. When the condensed sand 220 replaces the space 210 as shown in FIG. 4C, the pressure increases in each cylinder 121 through the hydraulic pipe 122 connected to the sea work line as shown in FIG. 4D. Piston support pillar 140 is pushed to the replacement portion 230 filling the portion 210 and the front column 110 of the improvement device 100 consolidates the marine soft ground 200 to both sides of the improvement device 100 and Advance in the direction of the arrow, that is, the front of the improvement device 100. At this time, the condensed sand 220 inside the space 210 is recompressed and a part of the sand 220 is pushed by the reformer 100 to advance, so that both side wall pillars 130 of the reformer 100 are moved. The soft ground 200 at the end is pushed out so that the width of the replacement portion 230 is wider than the width of the improvement device 100.

As shown in e of FIG. 4, when the pressure inside each cylinder 121 is reduced again, each piston 141 is advanced in the direction of the arrow and the piston support pillar 140 connected to each piston 141 is also advanced. At this time, as shown in f of FIG. 4, the space 210 is formed on the back surface of the piston support pillar 142, and as shown in FIG. 4 g, the repeated process of consolidating and replacing sand 220 with the space 210 is continuously performed. It is carried out to form a sand 220 wall pillar in the sea soft ground 200.

5 is a sand 220 wall column formed in the sea soft ground 200 as shown in the plan view showing the soft ground improvement method using the soft ground improvement device of the present invention than the width of the improved device 100 as shown in FIG. It is formed larger, because sand is pushed out of both side wall pillars 130 of the reformer 100 by pressure for advancing the reformer 100 on the marine soft ground 200.

FIG. 5 is a drawing constructed at one constant direction and at regular intervals, but the present construction method may be constructed in a lattice shape as needed. In addition to sand (220) as a substitute material can be used in various ways, such as crushed stone, stone powder, masato, shell, etc. In particular, using a concrete as a substitute material to form a grid wall column and to cure concrete in the soft ground grid If the internal soft ground of the concrete wall column formed by dredging and substituting with high-quality substitution material, it is possible to obtain the marine soft ground improvement effect of economical and excellent structure.

Using the improved method of the marine soft ground 200 using the improvement device 100 as described above has the following effects.

First, it is possible to reduce the air because it can be installed at once to improve extension line with one stroke drawing.

Second, the combination of construction equipment is simple and the process is simple.

Third, by forming a straight or lattice wall pillar, it is safer to the side load and the transverse pressure caused by the arc activity.

Fourth, it is possible to use a variety of substitution materials, and using the replacement material as concrete, after creating the concrete grid wall pillar dredging the soft ground between the wall pillars can be replaced with a good replacement material can be expected excellent safety.

Claims (2)

In constructing the marine soft ground (200) improvement device 100, the material is made of a solid steel material. The structure is vertically made of the front pillar 110 protruding at a predetermined angle toward the front of the improvement device 100, the cylinder support pillar 120 integrally with the front pillar 110 at the rear of the front pillar 110. ) Is formed vertically, the cylinder 121 is arranged in a line up and down at regular intervals on the back surface of the cylinder support pillar 120, the cylinder support pillar 120 and the cylinder 121 is also formed integrally cylinder support pillar Hydraulic pipe 122 for operating the hydraulic pressure of the cylinder 121 to 120 is connected to each cylinder 121, the piston 121 is connected to the piston 141 and the piston 141 and The piston support column 140 is integrally formed vertically in a constant wall form, and both side wall columns 130 are provided on both sides of the piston support column 140 at the front column 110 and the cylinder support column 120. Connected to the vertically formed cylinder 121 and Surrounding the stone 141, the piston support pillar 140, the lower portion of the improvement device 100 is connected to the lower portion of the front column 120 and the lower portion of both side wall pillar 130 to the hydraulic pressure from the cylinder 121 When the piston 141 is pushed to the maximum, the marine soft ground (200) improvement device having a structure of the lower plate 150 formed up to the piston support pillar rear surface 142 Driving the reinforcement apparatus 100 in the marine soft ground 200; By advancing the piston 141 to the front with the piston support pillar 140 by hydraulic pressure in the inside of each cylinder 121 through the hydraulic pipe 122 connected to the sea work line, as long as the piston support pillar 140 is advanced. Forming a space portion 210; The air pressure is applied to the sand 220 from the lower plate 150 of the reforming apparatus 100 through a casing installed on a working ship in which sand 220 is loaded on the sea surface in the space 210. Consolidating the sand 220 to an upper portion of the space 210 to form a substitute 230; When the condensed-substituted sand 220 fills the space 210, the pressure is increased in the cylinder 121 through the hydraulic pipe 122 connected to the sea work line, thereby replacing the replacer 230 filling the space 210. Piston support pillar 140 is pushed so that the front column 110 of the improvement device 100 consolidates the marine soft ground 200 to both sides of the improvement device 100 and advances in the front direction of the improvement device 100. of; Performing the process continuously and repeatedly to inject the improvement device 100 into the marine soft ground 200 once to form a column 220 wall pillar in the marine soft ground 200 in a straight or lattice shape to the planned extension line. Marine Soft Ground (200) Improvement Method