KR100756524B1 - Method for reinforcing ground and apparatus for the same - Google Patents

Abstract

The present invention relates to a soft ground improvement method and a ground improvement apparatus used therein. In the soft ground improvement method of the present invention, a casing insertion step of inserting a casing into a perforated hole formed in the ground soil, a pocket member insertion step of inserting a pocket member inflated by injection of the ground improvement material into the casing, and a bag member It is configured to include a reforming material injection step to inflate a portion of the pocket member that is not wrapped with a casing by injecting the ground improvement material into the interior of the pocket member after the insertion step. Therefore, it is possible to construct a columnar improved body at a lower cost through a simpler process.

Grouting, Soil Improvement

Description

Ground Improvement Method and Ground Improvement Equipment {METHOD FOR REINFORCING GROUND AND APPARATUS FOR THE SAME}

1 and 2 are views for explaining a conventional soft ground reinforcement method

3 to 10 show the structure of the ground improvement apparatus according to an embodiment of the present invention.

3 is a schematic diagram of a ground improvement device;

4 is a longitudinal cross-sectional view of the bag member of the ground improving apparatus of FIG.

5 is a cross-sectional view taken along the cutting line VV of FIG. 4.

6 is a perspective view showing a deformable example of the bag member of FIG.

7 is a perspective view showing a groutable deformation example of the bag member of FIG.

Figure 8 is an exploded perspective view of the lower end of the casing of Figure 3

9 is a cross-sectional view taken along the line VII-VII of FIG. 8.

FIG. 10 is a cross-sectional view illustrating a deformable example of FIG. 9.

11A through 11E are cross-sectional views sequentially illustrating the soil improvement method using the soil improvement apparatus of FIG. 3.

12A and 12B are cross-sectional views showing the ground improvement method of the second embodiment of the present invention step by step.

** Description of the symbols for the main parts of the drawings **

10: pocket member 11: longitudinal pleats

12: Lateral pleat 13: Pouch protection member

14: shape holding member 20: casing

21: casing body 22: shoe

30: drawing device 40: improved material injection device

41: transfer pipe 42: pump device

The present invention relates to a ground improvement method and a ground improvement device used in the soft ground reinforcement method, and can be constructed at a lower cost through a simpler process of a column-shaped improvement body formed with a diameter larger than the diameter of the first perforated hole. The present invention relates to a ground improvement method and a ground improvement apparatus.

In the past, various methods for reinforcing soft ground have been proposed. A representative method is to drill a hole having a large diameter in the ground and inject water and hardener at high pressure, or inject air, water, and hardener at high pressure. Is choosing. In other words, the clay component around the hole drilled in the soil is removed by the high pressure water sprayed through the nozzle, and then the hardener liquid is injected to mix with the aggregate component of the soil in which the clay component is removed. It is to strengthen the soft ground by forming a solidified body.

According to the method described above, the clay component of the soil is excavated with high pressure water and then pushed to the ground, so that it is difficult not only to treat the enormous amount of clay muddy water which is pushed to the ground, but also simultaneously with the discharge of the clay component. Due to the injection of the hardening material is mixed with a large amount of cement liquid as a hardening material in the muddy water discharged to the ground causes a pollution problem. In addition, the conventional method is difficult to achieve the object because the hardening material may be discharged along the boundary of the ground layer in the ground in which the complicatedly deposited ground or thin layers are laminated.

In order to solve these problems, the method of reinforcing the soft ground to form a solidified body in the ground by injecting the hardened material mixed with the hardened material of the sand and the gravel and sand components below the prescribed standards into the ground, but the hardened material is contained in the bag (Korea Patent Publication No. 10-379076) has been developed.

The soft ground reinforcement method described above with reference to FIGS. 1 and 2 will now be described in detail. First, a hole 1 having a predetermined diameter is drilled in the ground G of the work place, and then the bag 4, the outer injection pipe 5, and the inner circumference in which the hardening material is to be sequentially inserted from the outside in the hole 1 are sequentially formed. Insert the inlet tube (6). Next, while injecting the hardening material 7 at a predetermined pressure through the internal injection pipe 6, the internal injection pipe 6 is raised step by step, and the hardening material 7 injected through the internal injection pipe 6 is the internal injection pipe ( 6) is ejected through the through hole (6a) formed in the side wall of the lower end portion and the through hole (5a) formed in the outer injection pipe (5) to be injected into the bag 4 with a strong pressure. Thus, when the hardener 7 is accommodated inside the bag 4, the soil is pushed to the side with a strong pressure to form a solid body having a diameter that is much extended than the first hole drilled in the soil to reinforce the soft ground. Is designed.

In the above soft ground reinforcement method, the through-hole (in order to prevent the hardened material 7 ejected through the inner injection pipe 6 from flowing upward through the space between the inner injection pipe 6 and the outer injection pipe 5). Packers 6b are installed at the top and bottom of the region where 6a) is formed. In the above-described soft ground reinforcement method, since the inner injection pipe 6 must be moved in the vertical direction at the same time as the hardening material 7 is injected, the weight and construction of the inner injection pipe 6 itself when the inner injection pipe 6 is moved vertically. Due to carelessness, the packer 6b disposed between the outer inlet tube 5 and the inner inlet tube 6 can be easily separated.

Furthermore, the packer 6b is for preventing the hardening material 7 from flowing upward and downward through the space between the outer inlet pipe 5 and the inner inlet pipe 6, so that if the packer 6b is the outer inlet pipe ( If it becomes loose between 5) and the inner injection pipe 6, and becomes loose, it will become impossible to prevent the outflow of the hardening | curing material 7 effectively.

On the other hand, since the hardening material 7 must pass through the plurality of through holes 5a and 6a formed in the inner injection pipe 6 and the outer injection pipe 5, the diameter of the aggregate component constituting the composition of the hardening material 7 is the through hole ( There is a restriction that must be smaller than the size of 5a and 6a). In addition, since the inner injection pipe 6 must be vertically moved in step while injecting the hardening material 7, the process is complicated and the construction cost increases, and a plurality of through holes 5a and 6a are provided in the outer injection pipe 5 and the internal injection pipe 6. ), The manufacturing cost is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a ground improvement method and a ground improvement apparatus that can be installed at a low cost through a simpler process.

The present invention provides a casing insertion step of inserting the casing into the perforated hole formed in the ground to achieve the object as described above; A bag member inserting step of inserting a bag member whose volume is expanded by the injection of a ground improving material into the casing; And an improved material injection step of infusing a portion of the bag member that is not wrapped with the casing by injecting a ground improvement material into the bag member after the bag member insertion step.

Therefore, the columnar improved body can be constructed at a low cost through a simpler process.

In addition, the casing drawing step of drawing a predetermined amount of the casing after the improving material injection step; And repeating the improving material injection step to the casing drawing step to form a columnar improved body in the drilling hole.

And, after the improving material injection step, the step of chopping the upper end of the pouch member inflated by reciprocating the casing in the longitudinal direction; it is effective to further include.

On the other hand, as another field of the present invention, the present invention is a casing body with a hollow formed therein; And a shoe formed thicker than the thickness of the casing main body at a lower end in the longitudinal direction of the main body.

Here, the casing body and the shoe are preferably screwed.

And, the present invention is inserted into the perforated hole formed in the soil, the bag member is expanded in volume by the injection of the ground improver; A casing disposed to surround the outside of the bag member to prevent volume expansion of the bag member; A drawing device for drawing out the casing; And an improved material injecting device for injecting the ground improving material into the bag member.

Here, the improved material injection device is connected to the upper end of the bag member, the improved material conveying pipe formed so that its length is longer than the length of the casing; And a pump device for pumping the improvement material to the transfer pipe.

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

However, in describing the present invention, a detailed description of known functions or configurations will be omitted in order not to disturb the gist of the present invention. In addition, the same reference numerals are given to the same and the same components as those described above, and detailed description thereof will be omitted.

3 to 10 show the structure of the ground improvement apparatus according to an embodiment of the present invention, FIG. 3 is a schematic view of the ground improvement apparatus, FIG. 4 is a longitudinal sectional view of the bag member of the ground improvement apparatus of FIG. 4 is a perspective view showing a deformable example of the bag member of FIG. 4, FIG. 7 is a perspective view showing an example that can be deformed by reciprocating the bag member of FIG. 4, FIG. 8 is an exploded perspective view of the casing of FIG. 3, FIG. 9 is a sectional view taken along the line VII-VII of FIG. 8, and FIG. 10 is a sectional view showing a deformable example of FIG. 9.

As shown in these figures, the ground improvement apparatus of the present invention is a bag member 10 is inserted into the drilling hole (1) formed in the ground soil (2), and the casing 20 disposed to surround the bag member (10) ), A drawing device 30 for drawing the casing 20, and an improved material injection device 40 for injecting the ground improvement material into the bag member 10.

The bag member 10 is formed with a longitudinal pleat 11 corrugated in a bellows shape in the longitudinal direction, and a pleated transverse pleat 12 so as to expand in the radial direction of the cross section. Therefore, the bag member 10 can be easily expanded in the longitudinal direction as well as in the radial direction of the cross section.

In addition, the outer side of the bag member 10 is provided with a bag protection member 13 that is easily torn. The pocket protecting member 13 prevents the pocket member 10 from being easily unfolded laterally until the improver is inserted into the pocket member 10 so that the pocket member 10 can be easily inserted into the casing 20. To do so. The bag protection member 13 may be manufactured using a vinyl material, a rubber band, or the like, and should be formed to a strength that can be torn when the improvement material is inserted into the bag member 10.

6 and 7, the bag-shaped holding member 14 is further provided to be wound around the bag member 10 to limit the degree of lateral expansion of the bag member 10. The bag shape holding member 14 is formed of a wire such as a wire, and is formed to surround the inside of the bag, preferably the outside. The bag-shaped holding member 14 shown in FIG. 6 is formed in a ring shape, and arranged in the longitudinal direction of the bag member 10, and the bag-shaped holding member 14 shown in FIG. 7 is formed in a spiral shape. It is wound in the longitudinal direction of the bag member 10. The shape holding member 14 as described above prevents the bag from expanding in atypical shape.

The casing 20 is composed of a casing body 21, a shoe 22 coupled to a lower end of the casing body 21, and an upper end cap 24 fixed to an upper end of the casing 20.

The casing body 21 is formed in a pipe shape, and a thread 21b for engaging with the shoe is formed at the lower end thereof.

The shoe 22 has an annular ring shape as a whole, a thick groove 22c is formed at a lower end thereof, and a thread 22a is formed at an inner side thereof. The shoe 22 serves to compact the upper surface of the bag member 10 inflated in the lower portion of the shoe 22.

The casing main body 21 and the shoe 22 may be coupled to each other by forming a thread on the outer surface of the main body 21 and the inner surface of the shoe 22, as shown in FIG. 8. Threads may be formed on the inner side and the outer side of the shoe 22 to join.

In addition, the casing body 21 and the shoe 22 may be coupled in various ways in addition to screwing. For example, the lower end of the casing body 21 and the upper end of the shoe 22 may be welded to each other.

The upper stopper 24 has a stopper 24a formed with a hollow 24b into which the transfer pipe 41 or the pocket member 10 can be inserted at the center to prevent the improvement material flowing out of the bag from overflowing to the upper end of the casing. Equipped.

Drawing device 30 is a device that can move the casing 20, such as a crane in the longitudinal direction.

Improved material injection device 40 is composed of a transfer pipe 41 connected to the upper end of the bag member 10, and a pump device 42 for feeding the improved material to the transfer pipe 41. The conveying pipe 41 is coupled to the bag member 10 and is formed such that the length exposed on the ground is longer than the length of the casing 20. This is in order to be able to fill the improved material while gradually pulling the casing 20 upward.

As the ground improving material used in the present invention, earth, grouting material, concrete, mortar, cement mixture and the like may be used.

11A to 11E are cross-sectional views sequentially illustrating a method for improving soil by using the apparatus for improving soil in FIG. 3.

The ground improvement method includes a casing inserting step of inserting a casing 20 into a boring hole formed in the ground soil, inserting a bag member 11a into the casing 20, and inserting a bag member 11a. After the improved material injection step (Fig. 11b), and the improved material injection step (Fig. 11b) after the improved material injection step (Fig. 11b) of the bag member 10 inflated by the reciprocating motion of the casing in the longitudinal direction It consists of a step of compacting the upper end, casing drawing step (Fig. 11c) to draw a certain amount of casing, reforming material injection step to casing drawing step to form a column-shaped improved body.

In the casing insertion step may be inserted to the hem of the improved body to form the casing, it may be inserted so as to penetrate the solidified layer.

In the step (11a) of inserting the bag member is injected through the interior of the casing 20 after a portion of the improved material is injected into the inside of the bag member.

In addition, in the case of the soft ground, the end of the bag member 10 can be excavated to the desired depth by the self-weight of the improved material partially injected into the inside of the bag member 10.

When the improvement material is injected in the improvement material injection step (FIG. 11B), the bag member 10 is expanded in the horizontal direction by the lateral wrinkles.

The step of compacting the upper end of the bag member is to reciprocate the casing in the longitudinal direction, so that the ball portion 22c of the shoe to compact the upper end of the inflated portion of the bag member (10).

Then, the casing drawing step and the improving material injection step are repeatedly performed, whereby the columnar improved body can be formed.

As described above, the present invention has a structure and method much simpler than the conventional one, and can form a columnar improved body. Therefore, the construction period and the cost can be significantly reduced.

In addition, since the swollen portion of the bag member is chopped using the shoe 22 having the ball 22c, the improved body can be chopped more firmly, and the bag can be prevented from being torn in the chopping operation.

And, by further comprising a shape holding member, the improved body can be formed in a constant shape.

12A and 12B are cross-sectional views showing the ground improvement method of the second embodiment of the present invention step by step.

The ground improvement method of the second embodiment of the present invention can be applied to the case where the lower layer 3 is formed to have the strength to be excavated only by the axial weight input applied to the injection pipe 41. 20) and through the hollow of the casing 20 is installed, the step of injecting the injection tube 41 wrapped in the bag member 10 to the desired depth (Fig. 12a) and through the injection tube 41 Injecting the improved material is made to inflate the bag member 10 (12b).

In order to prevent the bag member 10 from being damaged in the step of injecting (FIG. 12A), a tip cap 23 positioned at the bottom of the injection tube 41 and a protection member 13 formed to surround the bag member 10. Is provided.

Tip cap 23 is formed in the shape of a collar so that it can easily proceed to the bottom.

The protective member 13 may be formed of a material such as vinyl or a rubber band, and is formed to be easily torn by the expansion pressure of the modifier.

The ground improvement method of the second embodiment of the present invention can also form a columnar improved body using a simple method, so that the construction period and cost can be significantly reduced.

According to the embodiment of the present invention as described above, various effects including the following matters can be expected. However, the present invention is not achieved by exerting all of the following effects.

First, the present invention has a structure and method much simpler than the conventional one, and can form a columnar improved body. Therefore, the construction period and the cost can be significantly reduced.

In addition, since the swollen portion of the bag member is chopped using a shoe having a ball part, the improved body can be chopped much more firmly, and the bag can be prevented from being torn in the operation.

And, by further comprising a shape holding member, the improved body can be formed in a constant shape.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

Claims (5)

A pocket member inserted into a drilling hole formed in the ground soil, the volume of which is expanded by the injection of the ground improving material; A casing disposed to surround the outside of the bag member to prevent volume expansion of the bag member; A drawing device for drawing out the casing; And Improved material injection device for injecting the ground improvement material in the bag member; Including, A bag shape holding member wound around the bag member to limit the degree of lateral expansion of the bag member; Ground improvement device comprising a. delete delete delete The method of claim 1, The casing is, A casing body having a hollow formed therein; And A shoe thicker than the thickness of the casing body at the lower end in the longitudinal direction of the casing body; Geotechnical improvement device comprising a.

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