KR101401645B1 - Poor ground improvement method and system by forming cast-in-place plain concrete column and using separated doughnut auger having suction duct - Google Patents

Abstract

The present invention relates to a method and a system for improving a soft ground by using a double auger and forming a concrete pillar on a site, and more particularly, to a method and a system for constructing a foundation in a soft foundation, By calculating the ratio of concrete containing sand, gravel, cement and water based on the geological information, and by constructing the foundation structure of the structure in accordance with the calculated ratio, the structural safety of the construction applied to the soft ground such as the sea is improved Be able to
In addition, the present invention can be applied by adjusting the plan height optimized for the foundation and the structure at the time of constructing the foundation structure of the structure, and since the sufficient compression strength can be obtained even at a relatively low lipid improvement rate, And the construction cost can be reduced.
In addition, the present invention has the advantage of reducing the environmental pollution problem due to the construction of the structure by using less cement for discharging carbon dioxide when the same strength is realized.
Therefore, it is possible to improve the structural safety of the structure, the competitiveness in construction, and the reliability of the structure in the construction field of the soft ground such as the sea.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for improving a ground by using a double auger equipped with a suction port,

The present invention relates to a method and system for improving soft ground by using a double auger (SDA: Separated Donut Auger or DRA) excavated while rotating casing and auger in opposite directions, And more particularly to improve the structural safety and workability of a structure to be applied to soft ground such as marine.

Particularly, the present invention relates to a method for producing a deep soil stabilization by chemical (DCM) method in which a cement milk is mixed with a ground soil based on the geological information of the ground on which the foundation structure of the structure is installed, This paper deals with a method and system for improving the soft ground by using double auger instead of the method and forming a concrete column in the field.

Deep soil stabilization by chemical method (DCM) is an excellent chemical soil improvement method by strengthening the ground by mixing and mixing lime or cement in deep ground.

In particular, it is possible to construct an underground structure that is physically and chemically solidified through hydration reaction generated by mixing soft ground and stabilizer.

Due to these advantages, the deep mixing treatment method is currently used for construction of most soft grounds.

On the other hand, soft grounds, especially marine soft grounds, can contain large amounts of clay.

In the case of the foundation construction using the deep mixing treatment method in such a ground, even if a large amount of cement is administered, the desired strength may not be expressed.

In addition, the deeper excavation depths of the individual rods during multi-axis auger operation lead to an increase in the resistance of the existing ground piles and ground that are not removed from the top. Therefore, even though the weathering layer (target layer) is not agitated, it can be seen that the equipment is stopped due to overload, or the load is no longer lowered and idling.

In order to confirm this, even if confirmation boring is performed, clusters of several centimeters to several tens of centimeters of clay may be generated from the applied tip to the weathering layer, and the clay portion of such core may have a strength for securing the safety of the structure And it may cause the structure to settle when the time elapses.

In addition, in the deep mixing process, the volume of the cement milk is increased by the volume of the cement milk introduced by the agitation of the cement milk in the ground pile soil, the construction part is raised by the sludge, Soils should be treated with industrial waste mixed with cement.

On the other hand, the SDA (Separated Donut Auger) method is called double auger method, and it is also called DRA (Double Rod Auger) method in the field. The SDA method was originally designed as a method for constructing a PHC (Pretensioned Spun High Strength Concrete) column. However, it is not easy to hose at sea and it is difficult to transport, This method can be used to produce concrete columns that are installed on site because it causes deterioration and increase of construction cost.

The SDA method uses a casing to prevent air collapse and underground pressure, and by removing the soil inside the casing with a screw auger, it is not subjected to the pressure applied at the top, thereby reducing the overgrowth of the auger .

Since the hanger is not required in the process, the screw auger and the casing can be drawn at the same time, and the screw auger and the auger motor rotating the casing can be integrated and multi-shaft can improve the workability and economy.

An object of the present invention is to provide a method and system for improving soft ground by forming a concrete pillar on site using a double auger so as to sufficiently guarantee the structural safety of a structure to be applied to soft ground such as marine.

To this end, in the construction of a structure on a soft ground, the present invention calculates the ratio of sand, gravel, cement and water based on the geological information of the ground on which the foundation structure of the structure is installed, It is an object of the present invention to provide a method and a system for improving soft ground by using a double auger to improve the structural safety of the structure by constructing a foundation structure and forming a concrete pillar on a site.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

In order to accomplish the above object, the present invention provides a method of improving soft ground by using a double auger and forming a concrete pillar on a site, comprising the steps of: a) excavating a set point and, when the corresponding depth of cut reaches a set depth, Controlling operation of the sand / gravel silo, cement silo and water supply pump corresponding to the ratio of sand, gravel, cement and water calculated based on the geological information of the set depth; b) By pouring concrete containing sand, gravel, cement and water at a controlled rate into the excavation pits, the pillar of the foundation structure is formed by the method (DCX method: Deep plain concrete column eXpress) ; And c) constructing a base construction having a height that is adjusted to correspond to the plan height on top of the formed column.

The step a) comprises: a-1) confirming whether the excavation limit is reached while excavating the set point; a-2) confirming whether the drilling depth is a set depth when the drilling limit is reached; a-3) calculating the injection amount or ratio of sand, gravel, cement, and water by confirming the geological information of the excavation site when the corresponding excavation depth is the set depth; And a-4) controlling the operation of at least one of a sand silo, a gravel silo, a cement silo, and a water supply pump corresponding to the amount or the ratio of the sand, gravel, cement, and water.

The step c) includes the steps of: c-1) confirming the planned height of the foundation construction; c-2) confirming the construction method for the height adjustment; c-3) In the case where the above-described high-modulus construction method is a discharge method, the slab is formed by casting concrete after the column is installed.

The step c) includes the steps of: c-1) confirming the planned height of the foundation construction; c-2) confirming the construction method for the height adjustment; c-3) In the case where the determined plan height adjustment construction method is a variable two method, at least one height-adjusting unit block is stacked after installing the column to install a variable cap.

The soft ground improvement system for the use of the double auger according to the present invention and for the formation of the non-rigid concrete column in the field is based on the DCX method (Deep plain concrete column eXpress) A sand / gravel supply device for separately supplying sand and gravel for forming columns, respectively; The sand and gravel separated and supplied by the sand / gravel supply device are separately stored, and the control is performed in accordance with the ratio of the sand and gravel calculated based on the geological information of the set depth, A sand / gravel silo for controlling the feed rate of at least one of sand and gravel stored according to the signal; A water supply pump for controlling a supply amount of water in accordance with a control signal inputted corresponding to a ratio of water calculated on the basis of the set depth of the foundation structure; A cement silo for controlling a supply amount of cement according to a control signal input corresponding to a ratio of cement calculated based on geological information of a set depth to which the foundation structure is applied; A concrete mixer for mixing sand, gravel, cement and water supplied from the sand / gravel silo, water supply pump and cement silo; And a base machine for excavating a position where the foundation structure is to be installed and discharging the product generated during excavation to the outside, wherein the base machine includes a double auger, wherein the double auger comprises a casing, A discharge port formed at a lower portion of the auger for discharging water supplied from the water supply pump and a bearing inserted in the rod at the upper portion of the auger, And a suction port which is disposed between the inner surface of the casing and the auger and is fixedly coupled to the fixture and sucks water discharged from the discharge port and by-products generated during excavation.

And a variable cap installation device for installing a variable cap for adjusting the height of the foundation structure based on the plan height on the column of the constructed foundation structure.

The variable cap installation device includes: a hollow cap-shaped coupling member coupled to an upper portion of the longitudinal shaft; At least one height-adjusting unit block stacked on top of the coupling means; And a finishing tool fixedly installed on the upper portion of the unit block are sequentially stacked.

According to the above-mentioned solution, the present invention has an advantage that the structural safety of a structure applied to soft ground such as marine can be sufficiently secured.

In addition, the present invention has an advantage in that it is possible to adjust the planned height in accordance with the ground and structure when the foundation structure of the structure is constructed.

In particular, since the present invention can obtain a sufficient compressive strength even at a relatively low lipid improvement rate as compared with the existing deep-sea mixing treatment method, the construction period can be shortened and the construction cost can be reduced.

In addition, by using a method of forming an in-situ concrete concrete column in the deep layer when constructing a foundation structure, there is no need to lay a foundation stone, which can shorten the construction period and reduce the construction cost.

In addition, since the present invention generally uses sand / gravel rather than a marine ground sole mainly composed of clay, it is possible to realize a desired strength even with a relatively small amount of cement, thereby reducing the use of cement for discharging carbon dioxide to prevent global warming There is an advantage that can be helpful.

Therefore, it is possible to improve the structural safety of the structure, the competitiveness in construction, and the reliability of the structure in the construction field of the soft ground such as the sea.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a system for improving a soft ground by using a double auger according to an embodiment of the present invention and forming a concrete pillar on a site.
Fig. 2 is a schematic view schematically showing the double auger of Fig. 1;
3 is a flowchart illustrating a method of improving soft ground by using a double auger according to an embodiment of the present invention and forming a concrete pillar in a field installation.
FIG. 4 is a flowchart illustrating a specific embodiment of step 'S100' of FIG.
5 is a flowchart illustrating a specific embodiment of step S300 of FIG.
Fig. 6 is a view for explaining the release method in the method of Fig.
Fig. 7 is a view for explaining the variable bending method in the method of Fig.

Examples of the method of improving the soft ground by the use of the double auger equipped with the inlet according to the present invention and the formation of the concrete pillar in the field can be variously applied. An example will be described.

Before describing the soft ground improvement method of the present invention, the system used there will be described first, and the soft ground improvement method will be described.

FIG. 1 is a schematic view of a soft ground improvement system by using a double auger according to an embodiment of the present invention and forming a concrete pillar without a spot; FIG. 2 is a schematic view schematically showing the double auger of FIG. to be.

1 and 2, the soft ground improvement system 100 includes a sand / gravel feeder 110, a sand / gravel silo 120, a water feed pump 130, a cement silo 140, A concrete machine 150, a concrete stirrer 160, a concrete pump 170, and an auger 190.

The sand / gravel supply unit 110 is a column (or column) of the foundation structure to be constructed based on a DCX method (DCX method) in which a spot-free concrete column is formed in the deep layer Sand and pebbles are separately supplied to form a long sandy shale. For example, the sand / gravel feeder 110 may include an automatically controlled excavator.

The sand / gravel silo 120 separately separates and supplies sand and gravel separated and supplied by the sand / gravel feeder 110, and supplies the sand and gravel. In one embodiment, the sand / gravel silo 120 includes a sand silo 121 and a gravel silo 122. For example, the sand silo 121 and the gravel silo 122 may be separately configured to have a separate storage space, and each silo may be configured to individually control the supply amount of the stored sand or gravel.

The sand / gravel silo 120, the water supply pump 130 and the cement silo 140 may supply sand, gravel, cement and water to the concrete mixer 150, respectively.

The concrete mixer 150 mixes sand, gravel, cement and water supplied from a sand / gravel silo, a water supply pump and a cement silo.

The concrete mixed in the concrete mixer 150 is supplied to the base machine 180 through the concrete mixer 160 and the concrete pump 170.

The base machine 180 includes a double auger 190 which includes an inlet 191, a casing 192, an outlet 193, an auger 194 and a fixture 195.

Here, the casing 192 and the auger 194 are rotated and rotated in opposite directions to each other, and a detailed description thereof will be omitted for the general description of the double auger. .

The intake port 191 is inserted into the casing 192 and is disposed between the inner surface of the casing 192 and the auger 194. The outer surface of the auger 194 is supported by a bearing Sand, gravel, and the like contained in the ground during the excavation by the auger 194 and the water supplied through the discharge port 193 to the outer tractor.

That is, the suction port 191 is fixed to the fixture 195, and the fixture 195 is inserted into the rod, and the bearing is interposed between the fixture 195 and the rod, (191) to the rod.

The discharge port 193 can supply water at the time of excavation. Here, the supplied water facilitates excavation and enables the soil, sand, gravel, and the like generated during the excavation process to be sucked into the suction port 191 smoothly. In one embodiment, the discharge port 193 is capable of injecting the mixed concrete by the present invention once the excavation is completed.

The auger 194 excavates the ground. The excavation screw 194a may be provided at the end of the auger 194 and a hollow may be formed inside the auger 194 to communicate with the discharge port 193.

That is, the water supplied from the water supply pump 130 at the time of excavation by the auger 194 is discharged to the discharge port 193 through the hollow of the auger 194.

In one embodiment, the soft ground improvement system using the double auger comprises a variable cap installation device (not shown) for installing a variable cap for adjusting the height of the foundation structure on the basis of the plan height, ).

For example, the variable cap mounting apparatus includes a hollow cap type coupling member 31 coupled to an upper portion of a column as shown in FIG. 7, at least one height adjusting unit block 32 and a finishing hole 33 fixedly installed on the upper portion of the unit block 32 are sequentially stacked.

As another example, the variable cap installation apparatus may be provided with at least one of the coupling hole 31 and the finishing hole 33 on the column. In other words, the unit block 32 can be omitted depending on the needs of the person skilled in the art.

The specific configurations and coupling relationships of the respective devices described above can be variously modified according to the needs of those skilled in the art, and therefore, it is obvious that they are not limited to specific ones.

Hereinafter, a method for improving the soft ground using the soft ground improvement system 100 will be described.

FIG. 3 is a flowchart illustrating a method of improving a soft ground by using a double auger according to an embodiment of the present invention and forming a concrete pillar on a site. FIG. 4 is a flowchart illustrating a concrete implementation of step S100 of FIG. FIG. 5 is a flow chart for explaining a specific embodiment of the step 'S300' of FIG. 3, FIG. 6 is a view for explaining the release method in the method of FIG. 3, 3 is a view for explaining the variable bending method.

Referring to FIG. 3, in the course of improving the ground of a specific area (area where a structure is to be constructed) using the soft ground improvement system, a set point is set by using an auger 190 of the excavation base machine 180 (Step S100). In one embodiment, the sand / gravel silo 120 includes a sand silo 121 and a gravel silo 122.

After completion of the excavation at a desired excavation depth by the excavation base machine 180, concrete containing sand, gravel, cement and water is injected into the excavation hole to form a concrete structure of a foundation structure by DCX (Deep Plain Concrete Column eXpress) Thereby forming a column (step S200). In one embodiment, the pillars of the foundation structure can be constructed to be repeated at regular intervals.

A foundation construction having a height adjusted to correspond to the planned height is constructed on the top of the formed column (step S300). In one embodiment, the adjustment of the planning height can be controlled by the Release Method or the Variable-Head Method of the DCX method. For example, the release method can be adjusted by constructing a slab (20) by pouring concrete after pillar construction. As another example, the variable roofing method can adjust the planned height by installing the variable cap 30 on the top of the column 10.

4, in excavating the excavation hole, the excavation hole can be excavated while injecting water through the auger 190 of the base machine 180 (step S101). In one embodiment, the water injected during excavation can be mixed with the excavated soil, sand and gravel, so that water, soil, sand, gravel, etc. generated during excavation can be sucked through the suction port 191 and transferred to the toe line .

It is possible to confirm whether or not the excavation limit is reached while excavating the set point using the auger 190 of the base machine 180 (step S102).

In one embodiment, when the excavation limit is reached, it can be confirmed whether the excavation depth is the set depth (step S103). For example, if the excavation depth is the set depth (step S104), the geological information of the excavation point can be confirmed (step S105). As another example, if the corresponding excavation depth is not the set depth (step S104), the excavation depth can be corrected to correspond to the set depth (step S106).

In one embodiment, when the geological information at the corresponding excavation point is confirmed, the amount or the ratio of the sand and the gravel can be calculated based on the geological information (step S107), and the calculated amount or proportion of the sand and gravel The operation of at least one of the sand silo 121, the gravel silo 122, the water supply pump 130, and the cement silo 140 can be controlled (step S107).

Referring to FIG. 5, when the long construction of the foundation structure is completed, the plan height of the foundation construction structure can be confirmed (step S301), and the construction method for the confirmed plan height adjustment can be confirmed (step S302).

In one embodiment, if the identified planned height adjustment construction method is the discharge method (step S302), a concrete slab (step S304) is placed on top of the applied column 10 (step S303) 20) (step S305). For example, the discharge method can adjust the height of the slab 20 by adjusting the thickness of the slab 20 to pour the concrete.

In another embodiment, when the slab 20 is not installed, only the column 10 is used, or a higher precision plan height adjustment is required, or in order to prevent an increase in the construction cost due to the slab 20 construction In order to prevent the upper limit of the height of the column 10 from being adjusted, the plan height can be adjusted by using the variable cap 30 installed by the variable cap installation apparatus as shown in FIG.

In more detail, if the determined height adjustment method is variable (step S302), at least one height adjusting unit block is stacked after the column is constructed (step S306) (step S307) to install the variable cap 30 (Step S308). For example, a coupling hole 31 is provided on the top of the column 10, a unit block 32 for height adjustment is stacked on the coupling hole 31, and a finishing hole 33 is provided It is possible to prevent breakage of the upper end portion of the longitudinal groove 10. Through holes (not shown) corresponding to the reinforcing bars 11 of the column 10 may be formed in the coupling hole 31, the unit block 32 and the finishing hole 33, respectively.

In the foregoing, the use of the double auger according to the present invention and the method of improving the soft ground by the formation of the concrete pillar in the field have been described. It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it is to be understood that the embodiments described above are intended to be illustrative, and not restrictive, in all respects, and that the scope of the invention is indicated by the appended claims rather than the foregoing description, And all equivalents and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

100: Soft ground improvement system
110: sand / gravel supply device 120: sand / gravel silo
121: Sandy silo 122: Gravel silo
130: Water supply pump 140: Cement silo
150: Mixer for concrete 160: Mixer for concrete
170: Concrete pump 180: Base machine
190: Double Auger

Claims (7)

A sand / gravel supply system for separating and supplying sand and gravel to form a column of a foundation structure to be installed on the basis of a method (DCX method: Deep plain concrete column eXpress) for forming a spot-free concrete column;
A sand / gravel silo for supplying at least one of sand and gravel on the basis of geological information of set depth to which the foundation structure is installed, ;
A water supply pump for supplying water based on geological information at a set depth at which the foundation structure is installed;
A cement silo for supplying cement based on geological information at a predetermined depth at which the foundation structure is installed;
A concrete mixer for mixing sand, gravel, cement and water supplied from the sand / gravel silo, water supply pump and cement silo; And
And a base machine for excavating a site where the foundation structure is to be installed and discharging the product generated during excavation to the outside,
The base machine includes a double auger, wherein the double auger includes a casing, an auger disposed in the casing, the auger having a hollow formed therein, and water formed at a lower portion of the auger, A fixture which is inserted into the rod of the upper portion of the auger and has a bearing on an inner circumferential surface thereof and is fixed in position without being interlocked with the rotation of the rod, And a suction port for sucking water discharged from the discharge port and by-products generated during excavation,
A hollow is formed in the end portion of the auger so as to communicate with the discharge port and water supplied from the water supply pump is discharged to the discharge port through the hollow of the auger when excavated by the auger,
On the pillar of the constructed foundation structure,
Further comprising: a variable cap mounting device for mounting a variable cap for adjusting the height of the foundation structure based on the plan height,
The variable cap installation device includes:
A hollow cap-type coupling unit coupled to an upper portion of the longitudinal shaft;
At least one height-adjusting unit block stacked on top of the coupling means; And
And a finishing tool fixedly installed on the upper portion of the unit block are sequentially stacked. By using the double auger and the soft ground improvement system for forming the on-site reinforced concrete column,
a) operating a sand / gravel silo, cement silo and water supply pump for the supply of sand, gravel, cement and water to the set depth when the set point is drilled and the depth of the drilling reaches the set depth;
b) Forming a pillar of foundation structure by DCX method (Deep plain concrete Column eXpress) by injecting concrete containing sand, gravel, cement and water set in advance into the excavation hole step; And
c) constructing a base construction having a height adjusted to correspond to a plan height on top of the formed column,
The step a)
a-1) confirming whether the excavation limit is reached while excavating the set point;
a-2) confirming whether the excavation depth is a set depth when the excavation limit is reached as a result of checking whether the excavation limit is reached;
a-3) calculating the injection amount or ratio of sand, gravel, cement, and water by confirming the geological information of the excavation site when the excavation depth is the set depth as a result of checking whether or not the excavation limit is reached; And
a-4) operating at least one of a sand silo, a gravel silo, a cement silo, and a water supply pump corresponding to the amount or ratio of the calculated amounts of sand, gravel, cement and water,
The step c)
c-1) confirming the planned height of the foundation construction;
c-2) confirming the construction method for the height adjustment;
c-3) forming the slab by pouring the concrete after the column is installed, if the confirmed high-regulation construction method is a discharge method, and if the confirmed high-regulation construction method is variable, And a step of stacking at least one height-adjusting unit block after installation to provide a variable cap. The method of improving the soft ground by using a double auger and forming a concrete column in a field installation. delete delete delete A sand / gravel supply system for separating and supplying sand and gravel to form a column of a foundation structure to be installed on the basis of a method (DCX method: Deep plain concrete column eXpress) for forming a spot-free concrete column;
A sand / gravel silo for supplying at least one of sand and gravel on the basis of geological information of set depth to which the foundation structure is installed, ;
A water supply pump for supplying water based on geological information at a set depth at which the foundation structure is installed;
A cement silo for supplying cement based on geological information at a predetermined depth at which the foundation structure is installed;
A concrete mixer for mixing sand, gravel, cement and water supplied from the sand / gravel silo, water supply pump and cement silo; And
And a base machine for excavating a site where the foundation structure is to be installed and discharging the product generated during excavation to the outside,
The base machine includes a double auger, wherein the double auger includes a casing, an auger disposed in the casing, the auger having a hollow formed therein, and water formed at a lower portion of the auger, A fixture which is inserted into the rod of the upper portion of the auger and has a bearing on an inner circumferential surface thereof and is fixed in position without being interlocked with the rotation of the rod, And a suction port for sucking water discharged from the discharge port and by-products generated during excavation,
A hollow is formed in the end portion of the auger so as to communicate with the discharge port and water supplied from the water supply pump is discharged to the discharge port through the hollow of the auger when excavated by the auger,
On the pillar of the constructed foundation structure,
Further comprising: a variable cap mounting device for mounting a variable cap for adjusting the height of the foundation structure based on the plan height,
The variable cap installation device includes:
A hollow cap-type coupling unit coupled to an upper portion of the longitudinal shaft;
At least one height-adjusting unit block stacked on top of the coupling means; And
And a finishing tool fixedly installed on the upper portion of the unit block are sequentially stacked. The system for improving the soft ground for use of the double auger and the formation of the unfilled concrete column in the field. delete delete

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