KR102307108B1 - Soft ground on land improvement method using ball-type casing device and aggregate for mechanical stabilization - Google Patents

Abstract

The present invention relates to a weak ground improvement method capable of forming a compaction pile in weak ground using a granularity-adjusted aggregate compaction pile apparatus (100) including a ball type casing. The method includes: an intrusion process (S100) of dropping a ball type casing pipe (130) up to a support layer by installing the pipe on an intrusion position; an insertion process (S200) of inserting granularity-adjusted aggregate into the ball type casing pipe (130); a drawing process (S300) of discharging the inserted granularity-adjusted aggregate with air pressure which is preset in the ball type casing pipe (130); a re-intrusion process (S400) of expanding the discharged granularity-adjusted aggregate to the ball type casing pipe (130); and a repetition process (S500) of repetitively executing the drawing process (S300) to the re-intrusion process (S400) to form a granularity-adjusted aggregate compaction pile through the insertion of the granularity-adjusted aggregate and the compaction of the granularity-adjusted aggregate. The granularity-adjusted aggregate includes at least one among rubble, gravel, concrete rubble, stone dust, sand and blast furnace slag.

Description

Soft ground on land improvement method using ball-type casing device and aggregate for mechanical stabilization

The present invention relates to a combination of a drainage method of draining water inside a soft ground and a method of reinforcing the soft ground by compacting aggregate among the methods of improving and reinforcing the soft ground. More specifically, it relates to a land soft ground improvement method using a compaction pile device equipped with a ball-type casing, and using a particle size adjustment aggregate as an aggregate for forming a compacted pile.

In Korea, which is surrounded by sea on three sides and the land area is small, it is necessary to use the land efficiently by utilizing the soft ground along the coast. Various structures are being built on top of the soft ground existing on the coast for the efficient use of the land, but the soft ground treatment process is essential because the soft ground does not have enough bearing capacity to be used as the foundation of the structure.

As for the soft ground treatment method currently used. The coagulation method that injects quicklime and stabilizer into the soft ground, the drainage method that makes the ground itself hard by draining the water inside the soft ground (sand-drain method, PBD method, etc.) There is a replacement method of changing the ground with vibration, blasting, electricity, etc. to compact the ground, or a compaction method that increases the density of the ground by compacting crushed stone or sand.

When the soft ground is filled, consolidation does not end in a short time, but because long-term consolidation settlement occurs over a long period of time, there is a problem that the period required for improvement is long. The vertical drain method is widely used.

Among the vertical drainage methods, the Sand Drain method using sand has been widely used because it is easy to construct and has a good drainage effect. However, as a result of the large-scale use of sand for large-scale civil works, it became difficult to obtain the sand required for the treatment of soft ground, and the price increased, resulting in an increase in the construction cost. Therefore, it was necessary to develop an alternative material that has a high effect of improving the soft ground and is inexpensive.

Accordingly, recently, GD (Gravel Drain) and GCP (Gravel Compaction Drain) methods using gravel and crushed stone aggregate have been developed and used as substitutes for sand.

GCP method is a process of penetrating a casing pipe to a predetermined depth underground, a process of putting gravel, crushed stone, etc. into the casing pipe, a process of supplying air pressure to the inside of the casing pipe by an operator's operation, the casing pipe at a certain distance The process of drawing, penetrating and drawing the casing pipe is repeatedly performed to form crushed stone piles in the ground through compaction action.

However, the above GCP method was able to obtain drainage and compaction effects to a certain extent in the soft ground of the land, but the cohesive force and strength of the ground are very low in the soft ground such as soft cohesive soil, loose sandy soil, and organic soil. After penetration, aggregates such as gravel or crushed stone are inserted through the casing pipe and vibration compacted, the aggregate penetrates into the surrounding soft ground, so compaction piles with a constant top and bottom cross section are not formed. There were too many aggregates to be lost due to this formation, and there were many sections where soft ground soil penetrated into the voids between the aggregates and the voids were clogged (clogging phenomenon). It did not happen properly, and there was a problem that the voids between the aggregates did not lead up and down, left and right, and were cut off by the infiltrated soil in the middle, so that drainage was not done properly. Therefore, the strength improvement effect of the surrounding ground clay was insignificant.

The inventors of the present invention determined that the above problems of the existing GCP method are due to the fact that the grain size of the aggregates is not good, the meshing between the aggregates is not made properly, and the voids formed by the aggregates are large.

A particle size distribution curve is used as a method of indicating the particle size composition of aggregates or soil, and an example of the particle size distribution curve is shown in FIG. 9 .

As shown in FIG. 9 , the horizontal axis of the particle size distribution curve indicates the particle size of the soil (aggregate), and the vertical axis indicates the passing weight percentage with respect to the corresponding particle size (sieve size).

As shown in the curve A of FIG. 9 , the left and right range of the particle size curve is large, the gentler the slope, the wider the soil particle distribution range, the left and right range is narrow like the B curve, and the steeper the slope, the narrower the particle distribution range.

As the particle size corresponding to the particle size distribution curve passes through a weight percentage of 10% in the effective diameter and represented by D _10. D ₁₀ refers to the particle size through which 10 wt% of the total soil (aggregate) passes. That is, D ₁₀ means that 10% of the total weight of the soil is smaller than the size _{of D 10.}

In the same way, the particle diameter through which 60% of the total weight of the soil passes is _{called D 60} , and the particle diameter through which 30% of the total weight of the soil passes is called _{D 30.}

Using D ₁₀ , D ₆₀ , and D ₃₀ , the degree of particle size distribution and the particle size distribution state of the soil can be quantitatively expressed.

The coefficient of uniformity (C _u ) is calculated by _{C u} = D ₆₀ / D _{10 .} It can be said that the particle size distribution is poor and close to uniformity.

And, the curve C of FIG. 16 has a relatively wide left and right range, but is meandering up and down. In this case, the particle size distribution state can be quantitatively determined by calculating the coefficient of curvature (C _{g ).} The coefficient of curvature is obtained by the formula _{= (D 30} ) ² / (D ₁₀ × D _{60 ).} When the curvature coefficient is 1 to 3, it can be judged that the particle size distribution is good.

However, the conventional soft ground improvement did not reflect the particle size distribution characteristics of the aggregate, so there was a problem in that the crushed stone aggregate could not be used sufficiently in the soft ground drainage method performed on land.

In addition, the conventional GCP method has a problem in that it is difficult to predict the amount of aggregate required for the construction of the drainage pile in connection because it is difficult to grasp the actual amount of aggregate input and the amount of aggregate used to form the drainage pile.

Korean Patent Registration No. 10-0492512 (2005.05.23.)

In order to solve the problems of the prior art as described above, in the present invention, the aggregate used for the improvement of the soft ground on land is used as a particle size adjustment aggregate to maximize the interlocking between the aggregates, and a void capable of maximally expressing the capillary phenomenon. The purpose of this is to provide 'a method for improving land soft ground using ball-type casing and grain size-adjusted aggregate' that can secure the required shear strength and exhibit excellent drainage performance.

In addition, in the present invention, a ball casing pipe with a ball is coupled to the lower part of the casing pipe, and air nozzles are installed on the upper part and lower part of the ball casing pipe, effectively blocking the inflow of soil soil when the casing pipe penetrates, and particle size adjustment The purpose of this is to provide 'a method for improving the soft ground on land using ball-type casings and grain size-adjusted aggregates' that can improve the quality of compacted piles by maximizing the interlocking of aggregates.

In the present invention, in the land soft ground improvement method of forming compacted piles inside the soft ground by using the particle size adjustment aggregate compaction pile device 100 having a ball-type casing, the ball-type casing pipe 130 is inserted into the penetration position Intrusion step (S100) of installing in the lowering to the support layer; An input process (S200) of inputting the particle size adjustment aggregate into the ball-type casing pipe 130; a drawing process (S300) of discharging the particle size-adjusted aggregate injected into the ball-type casing pipe 130 with a preset air pressure; Re-penetration process (S400) of expanding the diameter of the particle size adjustment aggregate discharged to the ball-type casing pipe (130); A repeating process (S500) of repeatedly executing the extraction process (S300) to the re-penetration process (S400) to form a pile size adjustment aggregate through input of the particle size adjustment aggregate and compaction of the particle size adjustment aggregate (S500); including, but the particle size adjustment aggregate provides an onshore soft ground improvement method using a ball-type casing and particle size adjustment aggregate, characterized in that it contains at least one of crushed stone, gravel, concrete crushed stone, stone powder, sand, and blast furnace slag.

The drawing length of the drawing process (S300) for discharging the particle size adjustment aggregate of the present invention is 3m; It is characterized in that the re-penetration length of the re-penetration process (S400) of expanding the diameter of the discharged particle size adjustment aggregate is 2 m.

The particle size adjustment aggregate of the present invention, a particle diameter (D ₁₀ ) corresponding to a passing weight percentage of 10% is 0.3 to 0.9 mm; _{The particle diameter (D 30} ) corresponding to the passing weight percentage of 30% is 1.7 to 4.0 mm; It is characterized in that the particle diameter (D ₆₀ ) corresponding to the passing weight percentage of 60% is 5.0 to 8.0 mm.

The particle size control aggregate of the present invention is characterized in that all of the particle size distribution curve is located within the range between the lower limit curve of the particle size and the upper limit curve of the particle size of FIG.

The present invention performs a sieve test on the aggregate to be used before the input process (S200), D ₁₀ : 0.3 ~ 0.9 mm, D ₃₀ : 1.7 ~ 4.0 mm, D ₆₀ : to check whether it is 5.0 ~ 8.0 mm After performing the aggregate quality inspection process, it is characterized in that the grain size-adjusted aggregate to be input is confirmed.

The present invention performs a sieving test on the aggregate to be used before the input process (S200), and confirms whether the particle size distribution curve obtained by the sieving test is located within the range between the lower limit curve of the particle size and the upper limit of the particle size. After performing the aggregate quality inspection process, it is characterized in that the grain size-adjusted aggregate to be input is confirmed.

In the input process (S300) of the present invention, the moving bucket 162 provided in the leader 160 of the compaction pile apparatus 100 rises along the leader 160 and is provided on the top of the ball-type casing pipe 130 It includes inputting the particle size adjustment aggregate into the hopper 120 .

The present invention is characterized in that by counting the number of times the particle size adjustment aggregate is supplied to the moving bucket (162), the amount of the particle size adjustment aggregate input into the ball-type casing pipe (130) is calculated.

In the drawing process (S300) of the present invention, it is characterized in that air is injected to the inputted particle size adjustment aggregate by the upper air nozzle (132b) and/or the lower air nozzle (132c).

The ball-type casing pipe 130 of the present invention includes a casing pipe 131 having a vibration hammer 110 installed thereon, and a hopper 120 provided on one side of the upper outer periphery; a ball casing pipe 132 coupled to a lower portion of the casing pipe 131, and an extension portion 132a having an expanded diameter at the lower portion thereof; A plurality of reinforcing wings 134 formed in the longitudinal direction spaced apart from the inner surface of the extension portion 132a by a predetermined distance, and from which the lower protrusion 134a protrudes in the inner direction; An annular sealing member 136 formed to be positioned on the upper portion of the reinforcing wings 134; a ball support 138 formed on the lower protrusion 134a of the plurality of reinforcing wings 134; and a ball 139 installed to be movable up and down between the sealing member 136 and the ball support 138 .

The land soft ground improvement method using the ball-type casing and the particle size adjustment aggregate of the present invention has the following effects.

First, if the aggregate is selected to fit the particle size distribution curve of the particle size-adjusted aggregate derived in the present invention, crushed stone aggregate, which has been difficult to use in the vertical drainage method of soft ground on land, can be used, which can replace expensive and difficult-to-find sand. The construction cost is greatly reduced because crushed stone and stone powder that can be procured near the soft ground improvement construction site can be used.

Second, the aggregate to be used as a vertical drainage material is drained as a vertical drainage material by performing a sieve size analysis on the aggregate to be used as a vertical drainage material and confirming that the particle size distribution curve by the sieve size analysis is within the range of the particle size distribution curve presented in the present invention. It can be checked whether performance and strength can be secured. That is, by performing a sieve test on the aggregate to be used, drawing a particle size distribution curve, or _{measuring D 10} , D ₆₀ , D ₃₀ , it is possible to simply check whether it is suitable as a vertical drainage material, and as a result, drainage and improvement can be improved.

Third, the particle size-adjusted aggregate presented in the present invention exhibits sufficient vertical drainage performance to improve the soft ground, and the particle size of the aggregate suitable for expressing the required shear strength is uniformly secured. Since compaction piles are formed as they are compacted, interlocking between aggregates is good, the size of the pores between the aggregates is uniform, and the pores are connected to the top, bottom, left and right of the drainage pile without breaking, so vertical drainage due to capillary phenomenon can be smoothly performed. have.

Fourth, the compaction effect is high, and the interlocking between the compacted aggregates is higher because the air is sprayed to the input particle size adjustment aggregate by an air nozzle and vibration is compacted by the vibration hammer while using the particle size adjustment aggregate with the uniform particle size distribution. The shear strength of the compacted pile is improved, and the capillary phenomenon occurs easily due to the fine pores formed by the interlocking of large and small aggregates.

Fifth, the present invention can improve construction efficiency by additionally installing air nozzles on the upper and lower parts of the ball casing pipe so that the extraction of the casing pipe and the discharge of the particle size adjustment aggregate are made more smoothly to form a drainage pile stably. have.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic diagram showing a pile construction method according to a preferred embodiment of the present invention.
Figure 2 is a side schematic view showing a file device according to a preferred embodiment of the present invention.
3 is a partial front schematic view showing a pile device according to a preferred embodiment of the present invention.
4 is a partial detailed schematic view showing a file device according to a preferred embodiment of the present invention.
5 is a perspective cross-sectional view showing a ball casing pipe of a ball-type casing pipe according to a preferred embodiment of the present invention.
6 is a front sectional view showing a ball casing pipe of a ball-type casing pipe according to a preferred embodiment of the present invention.
7 is a front cross-sectional view of the ball casing pipe showing the insertion of the ball-type casing pipe according to a preferred embodiment of the present invention.
8 is a front cross-sectional view of the ball casing pipe showing the drawing of the ball-type casing pipe according to a preferred embodiment of the present invention.
9 is an example of a particle size distribution curve.
10 is a particle size distribution curve of the particle size adjustment aggregate according to the present invention.
11 is an example of the determination method of the particle size adjustment aggregate according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification. Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an onshore soft ground improvement method using a ball-type casing and a particle size adjustment aggregate. The particle size adjustment aggregate used in the present invention will be described first, and then the particle size adjustment aggregate compaction pile device and the improved method with a ball type casing will be described.

The grain size adjustment aggregate used in the present invention is an aggregate for promoting drainage of the soft ground and enhancing the strength of the ground by using it in the land soft ground improvement method, and refers to an aggregate having a specific particle size distribution and a grain size distribution curve in the present invention. The particle size adjustment aggregate may include at least one of crushed stone, gravel, crushed concrete, stone powder, sand, and blast furnace slag.

The particle size adjustment aggregate of the present invention, 'the maximum dimension is less than 25mm, the 200 sieve (sieve size 0.075mm) passing rate is 1 to 6% by weight, and the particle diameter (D ₁₀ ) corresponding to the passing weight percentage of 10% is 0.3 to 0.9 mm _{, the particle diameter (D 30} ) corresponding to 30% of the passing weight percentage is 1.7 to 4.0 mm, and the particle diameter (D ₆₀ ) corresponding to 60% of the passing weight percentage is 5.0 to 8.0 mm ' and/or 'as shown in FIG. It refers to an aggregate having a particle size distribution curve within the range between the lower grain size limit curve and the upper grain size limit curve.

The maximum dimension of the particle size adjustment aggregate specified above, the pass rate of 200 sieve, and D ₁₀ , D ₃₀ , and D ₆₀ are not determined independently of each other, but are determined organically under interaction with each other, and these parameters are By acting organically in the grain size adjustment aggregate, the aggregates are firmly engaged with each other in the compaction pile, and uniform voids are formed vertically and horizontally.

When the size of the aggregate forming the compaction pile is 25 mm or more, the meshing between the aggregates is not good, the void becomes too large, so capillary action is difficult to occur, and clogging is easy to occur, so the particle size of the present invention The maximum dimension of the adjusted aggregate should be less than 25mm in order to work organically with the numerical ranges _{of D 10} , D ₃₀ , and D _{60 .}

If there are a lot of fine powder of particle size less than 0.075mm in the aggregate to form a compaction pile, is too small, so the air gap decreases the vertical drainage effect, the particle size adjustment aggregate of the present invention are organically and the numerical range of D _10, D _30, D ₆₀ In order to act, the passing rate of No. 200 sieve is 1 to 6% by weight.

And 10% by weight of the total grain size adjustment aggregate is used to pass through the sieve size of 0.3 ~ 0.9 mm. If D ₁₀ is smaller than 0.3 mm, there are many fine particles, so it is difficult to expect engagement and drainage effect between the aggregates, and D ₁₀ is 0.9 mm If it is larger, the voids between the aggregates become larger and capillary action is reduced.

Full adjustment of the particle size aggregate to 30% by weight, it is difficult to expect the effect of the engagement between the drain and the more finely divided aggregate If sieve opening size is less than 1.7 ~, D ₃₀ for use to pass a 4.0 mm is 1.7mm, than the D ₃₀ 4.0mm If it is large, the voids between the aggregates become larger, thereby reducing capillary action.

60% by weight of the total grain size-adjusted aggregate is used to pass through the sieve size of 5.0 ~ 8.0 mm. If D ₆₀ is smaller than 5.0 mm, there is a lot of fine powder, so it is difficult to expect engagement and drainage effect between the aggregates, and if D ₆₀ is less than 8.0 mm If it is large, the voids between the aggregates become larger, thereby reducing capillary action.

The maximum dimension, 200 sieve passing amount, and D ₁₀ , D ₃₀ , D ₆₀ are all organically combined to form a particle size distribution. If any one of these parameters is out of the numerical range, It affects the left-right range and curvature of the lower-limit curve and upper-limit curve of particle size, and in the end, such aggregate is an aggregate with reduced interlocking and drainage effects.

When explaining the particle size distribution curve of the particle size adjustment aggregate in FIG. 10, the horizontal axis of FIG. 10 indicates the particle size (unit: mm) of the particle size adjustment aggregate, and the particle size increases from right to left, and displays from 0.001 mm to 100 mm has been However, since the maximum dimension of the particle size control aggregate of the present invention is less than 25 mm, the particle size distribution curve of the particle size control aggregate is used up to 25 mm (refer to the 25 mm red line in FIG. 10). Also, a red line corresponding to 0.075 mm (red line on the right of the two red lines) is also shown in FIG.

The vertical axis of FIG. 10 represents the passing weight percentage of the particle size-adjusted aggregate with respect to the corresponding particle size (sieve size).

The particle size lower limit curve of FIG. 10 has a No. 200 passing rate of 6% by weight, a particle diameter (D ₁₀ ) corresponding to a passing weight percentage of 10% is 0.3 mm, a particle size corresponding to a passing weight percentage of 30% (D ₃₀ ) is 1.7 mm, _{The particle diameter (D 60} ) corresponding to 60% of the passing weight percentage is 5.0 mm, the upper limit curve of the particle size shows that the 200 sieve passing rate is 1 weight%, and the particle diameter (D ₁₀ ) corresponding to 10% of the passing weight percentage is 0.9 mm, passing through It indicates that the particle diameter (D ₃₀ ) corresponding to 30% by weight is 4.0 mm, and the particle diameter (D ₆₀ ) corresponding to 60% of passing weight is 8.0 mm.

Therefore, after performing a sieving test on the aggregate to be used at the site of the soft ground improvement construction, as a result of drawing a particle size distribution curve for the aggregate, the particle size distribution curve of the aggregate is within the range between the particle size lower limit curve and the particle size upper limit curve of FIG. If it appears as a gentle curve, the aggregate can be judged to be of good quality with excellent drainage effect and shear strength. If it is not located within the range, the particle size distribution of the aggregate is judged to be unsuitable as a material for compacted piles for improving soft ground.

Several particle size distribution curves are shown in FIG. 11. The (a) particle size distribution curve of FIG. 11 is determined to be a high-quality particle size-adjusted aggregate because the entire curve is located within the range between the lower grain size curve and the upper grain size curve.

In addition, the (B) particle size distribution curve and (D) particle size distribution curve of FIG. 11 cannot be used as a particle size adjustment aggregate because most of the curves are outside the range between the particle size lower limit curve and the grain size upper limit curve, and (C) particle size distribution In the case of curves, most of the curves are located within the range between the lower grain size curve and the upper grain size curve, but some of them are outside the range between the lower grain size curve and the upper grain size curve, so it cannot be used as a grain size adjustment aggregate.

In addition, in determining the quality of the aggregate, in addition to the method of determining by the particle size distribution curve, it is possible to determine the quality of the aggregate by the numerical values of _{D 10} , D ₃₀ , D _{60 . That is, the quality of the aggregate can be confirmed by obtaining D 10} , D ₃₀ , and D ₆₀ after performing a sieve test on a certain aggregate, and checking whether these values are within the specified numerical range above.

Check that D ₁₀ is 0.3 ~ 0.9 mm, D ₃₀ is 1.7 ~ 4.0 mm, and D ₆₀ is 5.0 ~ 8.0 mm. If D ₁₀ , D ₃₀ , and D ₆₀ satisfy each range, the aggregate is drained It can be a material for compacted piles with excellent effect and shear strength, and if any one of the three ranges is exceeded, it is judged as an unsuitable aggregate.

Hereinafter, a particle size adjustment aggregate compaction pile device having a ball type casing used in the present invention will be described.

In the particle size adjustment aggregate compaction pile device 100 having a ball type casing of the present invention, the moving bucket 162 provided in the leader 160 of the compaction pile device 100 rises along the leader 160 . It is configured including inputting the particle size adjustment aggregate into the hopper 120 provided on the upper portion of the ball-type casing pipe 130 .

By counting the number of times the particle size adjustment aggregate is supplied to the moving bucket 162 , the amount of the particle size adjustment aggregate input into the ball-type casing pipe 130 can be calculated.

In addition, when the particle size adjustment aggregate compaction pile device of the present invention supplies a preset amount of particle size adjustment aggregate to the moving bucket 162 through the fixed bucket 150 as described above, the fixed bucket 150 is a hopper. Through the number of times supplied to (120), the actual amount of grain size adjusted aggregate used to form the compacted pile can be checked, and the grain size adjustment is made by comparing the required amount of grain size adjusted aggregate predicted before the implementation of the construction method and the amount of grain size adjusted aggregate actually used. By making it possible to confirm the loss rate of aggregate, it is possible to obtain the effect of improving the efficiency of construction by making the prediction and supply of the amount of grain size-adjusted aggregate required for the construction of adjacent compacted piles continuously constructed quickly and smoothly.

The leader 160 is installed so that a moving bucket 162 receiving a preset amount of particle size adjustment aggregate is raised and lowered on one side, and the ball-type casing pipe 130 is installed on the front side of the leader 160 and on the upper side A vibration hammer 110 is installed, and a hopper 120 is provided on one side of the upper part of the outer periphery to penetrate and draw into the ground.

That is, after the ball-type casing pipe 130 is penetrated by the vibration hammer 110 in the land soft ground improvement method to be described in detail later, when the particle size adjustment aggregate is supplied to the moving bucket 162, the moving bucket ( 162) rises along the leader 160 and supplies the particle size adjustment aggregate to the hopper 120 of the ball type casing pipe 130, and after the particle size adjustment aggregate is supplied to the inside of the ball type casing pipe 130, the ball As the type casing pipe 130 is drawn out, the particle size adjustment aggregate is discharged to the lower side, and as the ball type casing pipe 130 penetrates again, the particle size adjustment aggregate is compacted to form a compacted pile.

The ball-type casing pipe 130 has a cylindrical shape having a constant diameter in order to supply a particle size adjustment aggregate by pouring it into a soft ground, and a casing pipe 131 provided in the upper part and a ball casing pipe 132 provided in the lower part. ), and the ball casing pipe 132 is coupled to the lower portion of the casing pipe 131 to extend in the vertical direction.

Looking at the ball-type casing pipe 130 in detail, the casing pipe 131 in which the vibration hammer 110 is installed on the upper part, the hopper 120 is provided on one side of the upper outer periphery, the lower part of the casing pipe 131 . The ball casing pipe 132, which is coupled to the lower portion and has an extension portion 132a having an expanded diameter, is formed in the longitudinal direction spaced apart from the inner surface of the extension portion 132a by a certain distance, and is formed in the lower portion in the inward direction A plurality of reinforcing wings 134 from which the lower protrusions 134a protrude, an annular sealing member 136 formed to be positioned on the upper portion of the reinforcing wings 134, the lower protrusions of the plurality of reinforcing wings 134 ( 134a) includes a ball support 138 formed on the upper portion and a ball 139 that is installed to be movable up and down between the sealing member 136 and the ball support 138 .

The ball casing pipe 132 has an upper portion having the same diameter as that of the casing pipe 131 and is coupled to the lower portion of the casing pipe 131 to extend, and an extension portion 132a having an expanded diameter at the lower portion is provided. is formed, and a plurality of reinforcing wings 134, sealing member 136, ball support 138, and ball 139 are installed inside the expansion part 132a so that the ball-type casing pipe 130 is underground. When the ball 139 penetrates, the inflow of dirt can be prevented, and when the ball-type casing pipe 130 is drawn out, the particle size adjustment aggregate is discharged by the expansion part 132a, the diameter of which is expanded. to make it run smoothly.

An arc-shaped contact portion (not shown) corresponding to the ball 139 is formed on the inner surface of the reinforcing wing 134 to prevent the ball 139 from moving upward through the reinforcing wing 134 . .

The reinforcing wing 134 for forming the close contact portion is configured to include an upper protrusion 134b protruding in the inner direction of the ball casing pipe 132 on the upper portion, and the inner surface of the upper protrusion 134b, that is, The contact portion is formed on the surface formed in the inner direction of the ball casing pipe 132 . Therefore, when the ball-type casing pipe 130 is penetrated into the ground, the ball 139 is in close contact with the contact portion of the reinforcing wing 134, so that the adhesion between the ball 139 and the reinforcing wing 134 is more A strengthening effect can be obtained. At this time, if the curvature of the contact part and the curvature of the ball 139 are made the same, the effect of closer contact may be obtained.

At this time, the reinforcing wing 134 is configured to include a lower protrusion 134a protruding in the lower portion in the inward direction so that the particle size adjustment aggregate can be discharged to the lower portion, and the ball support 138 is the lower protrusion 134a. ) is stably provided at the top.

A sealing member 136 is formed around the upper portion of the reinforcing wings 134 , and the sealing member 136 is formed in an annular shape so as to be positioned above the reinforcing wings 134 , and the reinforcement An annular close contact portion to which the ball 139 is in close contact is formed together with the inner surface of the wing 134 , so that when the ball-type casing pipe 130 penetrates, the ball 139 expands the ball casing pipe 132 . The inside of the (132a) is sealed, the effect of preventing the inflow of dirt is realized. At this time, the inner diameter of the sealing member 136 should be smaller than the outer diameter of the ball.

The sealing member 136 has a structure in which the cross-section is formed to protrude in the shape of ">" at the same position as the contact portion of the reinforcing wing 134 to maintain the sealed state when the ball 139 is in close contact, and The upper plate 136a inclined to protrude, the lower plate 136c inclined opposite to the upper plate 136a, and the support plate 136b are formed in the inner center of the upper plate 136a and the lower plate 136c to form a ball 139 ), the shape is stably maintained after it is adhered.

At this time, the ball 139 has an empty spherical shape inside and is configured to float upward when a buoyant force is applied by groundwater or soil, and the ball support 138 is the ball type casing pipe 130 When the pipe 130 is drawn out, By supporting the lower portion of the ball 139, the ball 139 is prevented from being separated from the extension portion 132a of the ball casing pipe 132, as well as the particle size adjustment aggregate inside the ball-type casing pipe 130. It realizes the effect of smoothly discharging to the outside.

The operation of the ball-type casing pipe 130 of the present invention having the above configuration will be described as follows. First, in the process of penetrating the ball-type casing pipe 130 into the underground of the land soft ground, when groundwater and soil are introduced through the lower part of the ball casing pipe 132, the buoyancy of the groundwater and soil acts as a ball ( 140) rises, and accordingly, the ball 139 is firmly in close contact with the contact part of the sealing member 136 and the reinforcing blade 134, so that groundwater and soil are introduced into the ball casing pipe 132. it is prevented

Conversely, when the ball-type casing pipe 130 is drawn out after the particle size-adjusting aggregate is put into the ball-type casing pipe 130, the ball by gravity of the particle-size adjustment aggregate and the air pressure inside the ball-type casing pipe 130 (139) descends, and the ball 139 is seated on the ball support 138, and the particle size adjustment aggregate is quickly and through the space formed between the inner surface of the ball casing pipe 132 and the ball 139. As it is discharged smoothly, compacted piles are formed in the ground.

That is, the ball-type casing pipe 130 of the present invention can improve the construction quality of the compacted pile by more effectively preventing the inflow of groundwater and soil through the above-described configuration along with the air pressure formed therein.

In addition, an upper air nozzle 132b and a lower air nozzle 132c may be provided on the upper portion of the ball casing pipe 132 . The upper air nozzle 132b is positioned above the lower air nozzle 132c, and the lower air nozzle 132c is positioned above the extended part 132a.

The upper air nozzle (132b) realizes the effect of allowing the air pressure inside the ball-type casing pipe 130 to be stably and quickly formed at the same pressure throughout, and to smoothly discharge the particle size adjustment aggregate.

The lower air nozzle (132c) together with the upper air nozzle (132b) makes the discharge of the grain size adjusting aggregate more smoothly, so that the compaction pile by the grain size adjusting aggregate can be smoothly formed, and also of the grain size adjusting aggregate. It realizes the effect of smoothly drawing out the ball-type casing pipe 130 together with the discharge.

At least one of the upper air nozzle 132b and the lower air nozzle 132c may be provided. Preferably, each is provided as a pair, and when provided as a pair, the upper air nozzle 132b and the lower air nozzle 132b It is preferable that the nozzles 132c are disposed in a direction perpendicular to each other. When the upper air nozzle (132b) and the lower air nozzle (132c) spray air in an orthogonal direction, it exhibits the effect of allowing the discharge, mixing, compaction and engagement of the particle size adjustment aggregate to be made more smoothly.

At this time, the upper air nozzle (132b) and the lower air nozzle (132c) are formed so that the portion inside the ball casing pipe 132 is inclined downward so that the air is sprayed in the downwardly inclined direction. The same effect can be realized more efficiently.

In addition, the ball casing pipe 132 is formed to protrude upwardly on the outer periphery, and a guide protection part 132d formed to be positioned under the upper air nozzle 132b and the lower air nozzle 132c. The guide protection part 132d realizes the effect of preventing damage to the upper air nozzle 132b and the lower air nozzle 132c when the ball-type casing pipe 130 is penetrated or pulled out. do it

In particular, the particle size-adjusted aggregate of the present invention has a good particle size distribution as described above, and has a particle size and mixing ratio that can express special effects in compacted piles of land soft ground. It plays a role of allowing the particle size-adjusted aggregate to be evenly mixed and discharged. After that, if a compaction pile is formed by a vibration hammer and repeated process, interlocking and compaction effects are good, so high shear strength is exhibited, and the voids between the aggregates are not cut. It can be formed uniformly without a capillary phenomenon, thereby exhibiting a special effect of smoothly performing vertical drainage due to capillary action.

The detailed description of the land soft ground improvement method using the ball-type casing and the particle size adjustment aggregate of the present invention as described above is as follows.

The land soft ground improvement method of the present invention includes a penetration process (S100), an input process (S200), a drawing process (S300), a re-penetration (S400) and a repeating process (S500).

First, in the penetration process ( S100 ), the ball-type casing pipe 130 of the compaction pile device 100 is installed at the penetration position of the construction area and descends to the support layer with a vibration hammer or the like.

In the input process (S200), the required particle size adjustment aggregate is input through the hopper 120 into the ball-type casing pipe 130 lowered to the support layer. At this time, by counting the number of times of supply of the moving bucket 162 for supplying the particle size adjustment aggregate to the hopper 120 and calculating the amount of particle size adjustment aggregate input into the ball-type casing pipe 130, to form a compaction pile It is possible to check the amount of grain size-adjusted aggregate for

The drawing process (S300) draws out and discharges about 2.8 to 3.2 m of the particle size adjustment aggregate injected into the ball-type casing pipe 130 in the input process (S200) with a preset air pressure, but with an upper air nozzle (132b) and/or Air can be sprayed to the particle size adjustment aggregate discharged by the lower air nozzle (132c). In the drawing process (S300), it is preferable to set the drawing length to 3 m.

A pair of upper air nozzles and a pair of lower air nozzles are provided, and an upper air nozzle and a lower air nozzle are provided so that the air injection direction of the upper air nozzle is perpendicular to the air injection direction of the lower air nozzle, and each air is sprayed When this is done, the particle size adjustment aggregate, which is uniformly mixed in the particle size, is evenly mixed and discharged, and a compacted aggregate pile with better compaction and interlocking can be formed. be able to

The re-penetration process (S400) re-penetrates the grain size adjustment aggregate pile formed by the drawing process (S300) with the ball-type casing pipe 130 for about 1.8 to 2.2 m to expand the grain size adjustment aggregate pile to form a compacted pile. , it is preferable to set the length of the re-penetration to 2 m in the re-penetration step (S400).

After the drawing process (S300) to the re-penetration process (S400) is performed, the process of the drawing process (S300) and the re-penetration process (400) is continuously repeated to form a compacted pile up to the surface of the soft ground (S500) this goes on

In particular, by this action, it is possible to use a particle size adjustment aggregate such as crushed stone, etc. to construct a pile of grain size adjustment aggregate compacted pile with excellent construction quality. At this time, the particle size adjustment aggregate referred to in the present invention is an aggregate having a particle size that satisfies the range of the particle size distribution curve described above, and crushed stone, gravel, concrete crushed stone, stone powder, sand, blast furnace slag, etc. may be included.

The particle size-adjusted aggregate used in the present invention is an aggregate whose particle size distribution curve exists in the space between the lower limit curve and the upper limit curve of the particle size of the particle size distribution curve shown in FIG. In the present invention, by deriving the parameters with the particle size distribution curve in the vertical drainage method, the quality of the aggregate used in the land soft ground improvement method can be guaranteed, and also compacted piles capable of exhibiting a predetermined drainage effect by using these properties It is possible to check in advance the quality of the grain size-adjusted aggregate that can be used for

Before the input process (S200), a sieving test is performed on the aggregate to be used, and the particle size distribution curve obtained by the sieving test is located between the lower limit curve and the upper limit curve of the particle size distribution curve of FIG. It can be checked whether the aggregate is suitable for forming compacted piles.

In other words, if a sieving test is performed on the aggregate to be used, and all of the particle size distribution curves obtained by the sieving test are not located inside the space between the particle size lower limit curve and the particle size upper limit curve of FIG. It should be used after adjustment, and when all of the particle size distribution curves are within the range between the particle size lower limit curve and the particle size upper limit curve shown in FIG.

In addition, the aggregate quality inspection process is not only a particle size distribution curve, but also a particle diameter (D ₁₀ ) corresponding to a passing weight percentage of 10%, a particle diameter corresponding to a passing weight percentage of 30% (D ₃₀ ) and a passing weight percentage corresponding to 60% It can also proceed by checking whether the particle size (D ₆₀ ) exists within the numerical range described above.

When the particle size adjustment aggregate is provided according to the numerical range derived from the present invention, a special effect of obtaining high-quality aggregate required for the improvement of the land soft ground is exhibited.

Although the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

A : Land equipment
100: particle size adjustment aggregate compaction pile device
110: vibration hammer 120: hopper
130: ball type casing pipe
131: casing pipe 132: ball casing pipe
132a: extended part 132b: upper air nozzle
132c: lower air nozzle 132d: guide protection part
134: reinforcing wing 134a: lower protrusion
136: sealing member 138: ball support
139: ball 160: leader
162: moving bucket

Claims (10)

In the land soft ground improvement method of forming compacted piles inside the soft ground using the particle size adjustment aggregate compaction pile device 100 having a ball type casing,
Penetration process (S100) of lowering the ball-type casing pipe 130 to the support layer by installing it at the penetration position;
An input process (S200) of inputting the particle size adjustment aggregate into the ball-type casing pipe 130;
a drawing process (S300) of discharging the particle size-adjusted aggregate injected into the ball-type casing pipe 130 with a preset air pressure;
Re-penetration process (S400) of expanding the diameter of the particle size adjustment aggregate discharged to the ball-type casing pipe (130);
A repeating process (S500) of repeatedly performing the extraction process (S300) to the re-penetration process (S400) to form a pile size adjustment aggregate compaction pile through input of the grain size adjustment aggregate and compaction of the grain size adjustment aggregate (S500);
The particle size adjustment aggregate includes at least one of crushed stone, gravel, crushed concrete, stone powder, sand, and blast furnace slag,
The particle size adjustment aggregate,
_{The particle diameter (D 10} ) corresponding to the passing weight percentage of 10% is 0.3 to 0.9 mm;
_{The particle diameter (D 30} ) corresponding to the passing weight percentage of 30% is 1.7 to 4.0 mm;
_{The particle diameter (D 60} ) corresponding to the passing weight percentage of 60% is 5.0 to 8.0 mm,
Before the input process (S200), a sieve test is performed on the aggregate to be used, and D ₁₀ : 0.3 ~ 0.9 mm, D ₃₀ : 1.7 ~ 4.0 mm, D ₆₀ : Aggregate quality inspection to check whether it is 5.0 ~ 8.0 mm After the process, the method for improving the soft ground on land using a ball-type casing and particle size adjustment aggregate, characterized in that the grain size adjustment aggregate to be input is determined. According to claim 1,
The drawing length of the drawing process (S300) for discharging the particle size adjustment aggregate is 3 m;
The re-penetration process (S400) of re-penetrating the discharged particle size-adjusted aggregate is 2 m in length. delete In the land soft ground improvement method of forming compacted piles inside the soft ground using the particle size adjustment aggregate compaction pile device 100 having a ball type casing,
Penetration process (S100) of lowering the ball-type casing pipe 130 to the support layer by installing it at the penetration position;
An input process (S200) of inputting the particle size adjustment aggregate into the ball-type casing pipe 130;
a drawing process (S300) of discharging the particle size-adjusted aggregate injected into the ball-type casing pipe 130 with a preset air pressure;
Re-penetration process (S400) of expanding the diameter of the particle size adjustment aggregate discharged to the ball-type casing pipe (130);
A repeating process (S500) of repeatedly performing the extraction process (S300) to the re-penetration process (S400) to form a pile size adjustment aggregate compaction pile through input of the grain size adjustment aggregate and compaction of the grain size adjustment aggregate (S500);
The particle size adjustment aggregate includes at least one of crushed stone, gravel, crushed concrete, stone powder, sand, and blast furnace slag,
The particle size adjustment aggregate, all of the particle size distribution curve is located within the range between the lower limit curve of the particle size and the upper limit curve of the particle size,
Before the input process (S200), a sieving test is performed on the aggregate to be used, and the particle size distribution curve obtained by the sieving test is located within the range between the particle size lower limit curve and the particle size upper limit curve. After the process, a method for improving land soft ground using a ball-type casing and particle size adjustment aggregate, characterized in that the grain size adjustment aggregate to be input is determined.

(Vertical axis: passing weight percentage (%), horizontal axis: particle size (unit: mm)) delete delete According to any one of claims 1, 2, 4,
The input process (S200) is
The moving bucket 162 provided in the leader 160 of the compaction pile device 100 rises along the leader 160 to feed the particle size adjustment aggregate into the hopper 120 provided at the top of the ball-type casing pipe 130. An onshore soft ground improvement method using a ball-type casing and particle size adjustment aggregate including input. 8. The method of claim 7,
A ball-type casing and particle size-adjusted aggregate, characterized in that by counting the number of times that the particle size-adjusted aggregate is supplied to the moving bucket 162 , the amount of the particle-size-adjusted aggregate injected into the ball-type casing pipe 130 is calculated. A method of improving land soft ground using 8. The method of claim 7,
In the drawing process (S300),
An onshore soft ground improvement method using a ball-type casing and particle size adjustment aggregate, characterized in that air is sprayed to the input particle size adjustment aggregate by the upper air nozzle (132b) and/or the lower air nozzle (132c). According to any one of claims 1, 2, 4,
The ball type casing pipe 130,
a casing pipe 131 having a vibration hammer 110 installed on the upper portion and a hopper 120 provided on one side of the upper outer periphery;
a ball casing pipe 132 coupled to a lower portion of the casing pipe 131, and an extension portion 132a having an expanded diameter at the lower portion thereof;
A plurality of reinforcing wings 134 formed in the longitudinal direction spaced apart from the inner surface of the extension portion 132a by a predetermined distance, and from which the lower protrusion 134a protrudes in the inner direction;
An annular sealing member 136 formed to be positioned on the upper portion of the reinforcing wings 134;
a ball support 138 formed on the lower protrusion 134a of the plurality of reinforcing wings 134; and
A ball-type casing comprising a ball 139 that is installed so as to be movable up and down between the sealing member 136 and the ball support 138, and a method for improving land soft ground using a particle size adjustment aggregate.

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