KR20150085637A

KR20150085637A - Stable method and structure for soft ground

Info

Publication number: KR20150085637A
Application number: KR1020140005524A
Authority: KR
Inventors: 박남서; 김기준; 송재용
Original assignee: 주식회사 산하이앤씨; 산하토건(주)
Priority date: 2014-01-16
Filing date: 2014-01-16
Publication date: 2015-07-24

Abstract

The present invention relates to soft ground stabilization method and structure using a stabilizer and geotextile. According to the present invention, the soft ground stabilization method using a stabilizer and geotextile includes: a step of forming a stabilization layer in a pile form; a step of stabilizing the surface of the soft ground; and a step of inserting a head part, a conical insertion part, and a fixating unit into a through-hole of a bamboo mat or a geotextile to fixate the bamboo mat and the geotextile. Therefore, the soft ground stabilization method and structure using a stabilizer and geotextile allow the improvement of the soft ground through a combined treatment method; secure bearing power by stabilizing the soft ground through simple and effective structure and method; and improve the economic efficiency and workability.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for stabilizing soft ground using a stabilizer and a geotextile,

More particularly, the present invention relates to a method for stabilizing a soft ground using a stabilizer, a geotextile or a bamboo mat and a structure thereof, and more particularly, to a method for stabilizing a soft ground using a stabilizer and a geotextile or a bamboo mat, The present invention relates to a method for stabilizing a soft ground using a stabilizer and a geotextile, which can be stabilized by a simple and efficient structure and method, and maximizing utilization.

Generally, soft ground improvement methods have been used for preloading the ground with vertical drainage materials such as PBD, sand drain, pack drain and so on to promote consolidation drainage. However, even if the strength of the soft ground is increased, the damage of the structure due to the long-term consolidation or secondary compression and the occurrence of the unevenness of the foundation due to the subsidence of the foundation can not be completely avoided. Even if the strength of the ground is increased by the consolidation drainage method, If the load or the load of the structure is large, a basic system for preventing the destruction of the ground should be additionally introduced. For this purpose, replacement method, mixed treatment method and pile foundation are applied.

Sand blasting piles used in the replacement method and the mixed treatment method used in the high pile method are widely used because they can increase the bearing capacity by improving the strength of the soft ground through substitution or cementation of the surface layer or deep part, And the economical efficiency and the workability are deteriorated.

The basic system includes a raft foundation, a pile foundation, and a piled raft foundation. The pile supporting foundation is a method in which the raft supports the structure by supporting the upper structure by supporting the upper structure by securing the supporting force by dispersing the load of the upper structure and restraining the excessive settlement of the raft. Compared to other types of pile foundation, it is superior in economical method in terms of bearing capacity and settlement control. However, it is not effective in the settlement problem due to the weight of raft, reduction of supporting effect of raft and construction of pile to support layer when applied to soft ground . There is a way to share the load by installing geosynthetic fiber on the pile head similar to the pile support foundation foundation, and the related technology is as follows.

Korean Utility Model Registration No. 20-292926 discloses a method for increasing the bearing capacity of a soft ground using a compaction pile reinforced with a geotextile pack by a soft ground replacement method.

Fig. 1 is a view for explaining a state in which construction is carried out by the method disclosed in the above document.

1, first, a steel pipe is press-fitted into a soft ground 1, and then a packing material 2 such as gravel, sand or crushed stone is filled in a pack 2 reinforced with a high strength geogrid, (Column).

Thereafter, sand reinforced mat reinforcement 4 is laid on a certain plane. The disclosure of this document is part of a GCC (Geotextile Coated Column) method that supports the embankment load (5) in a soft ground with columns wrapped in a geotextile style.

This method constitutes a composite ground with increased shear strength by replacing a part of the soft ground with sand and gravel columns. Burlging and necking fractures of large-diameter stone columns must be prevented for more efficient ground displacement.

The method disclosed in the above document improves the quality of the stone column by filling the sand with the high strength geosynthetic fiber (2) to form a pack.

On the other hand, various methods other than the techniques disclosed in the above-mentioned documents are known to the Korean Intellectual Property Office for improving the soft ground.

No. 10-065761, soft ground support strengthening apparatus including geosynthetic fiber installed on a pile head, soft ground support of the soft ground of Publication No. 2000-006070, soft ground reinforcement made of slaked lime and zeolite disclosed in Publication No. 2002-002419 No. 10-081386, No. 10-020131, No. 10-020131, Publication No. 10-2004-A, No. 10-020131, and a method for rapidly improving the soft ground of the present invention, No. 0032-5050, No. 2000-0064143, No. 2001-0064143, which is incorporated herein by reference in its entirety, and the GeoGrid for geotechnical reinforcement of Registration No. 10-0943669, No. 10-2010-0040177 Mats for soft ground work and basic construction methods using them.

Among the above disclosed technologies, in particular, the technology of Registration No. 10-065761 discloses a technique in which a geosynthetic fiber is installed on the upper portion of a pile so as to support not only the axial load but also lateral pressure and lateral load, It is a device that strengthens the bearing capacity of the ground. That is, the technique disclosed in Registration No. 10-065761 is a method of applying a pile foundation to a foundation of a soft ground and supporting an upper load by connecting a pile with a geotextile instead of installing a reinforced concrete slab on the pile head.

Conventionally, piles are connected by concrete but they are connected with high strength geosynthetic fiber, which does not require member reinforcement due to sagging and connects the geosynthetic fiber with the pile to transmit the upper load directly to the pile. However, this technique also requires pile construction up to the support layer, and requires a new structural improvement because the pile structure is relatively complicated due to the necessity of the geosynthetic fiber, the pile, the sand mat, and the bolt.

Korean Intellectual Property Office Registration No. 10-065761

Therefore, it is an object of the present invention to provide a method for stabilizing soft ground using a stabilizing agent and geotextile, which can stabilize a soft ground with a simple and efficient structure and method, The purpose of the method and its structure is to provide.

This object is solved by a surface layer soft ground improvement of a plate-like structure; It is accomplished by mixing and mixing soft soil soil and stabilizer in the present position with stirring device, or by mixing a stabilizer after hammer grab excavation using auger excavator or oscillator and filling crushed stone aggregate with pile-shaped deep layer stabilized layer do.

It is another object of the present invention to provide a stabilized layer of soft ground which is formed on a surface of a soft ground by stabilizing a surface layer after mixing with a soft ground of a surface layer, Geosynthetic fiber; And a geotextile fixing unit inserted into the through hole of the geosynthetic fiber to fix the geosynthetic fiber, and a soft ground stabilizing structure using geosynthetic fibers.

As a result, the above object is achieved by a simple and efficient structure combining the improvement of the surface layer soft ground of the plate-like structure and the soft ground of the deep layer improved in the form of the pile into the structural form of the pile support surface foundation by using the geosynthetic fiber and the geotextile fixing unit .

According to the present invention, the soft ground can be improved through the mixing treatment method and the soft ground can be stabilized by a simple and efficient structure and method, so that the supporting force can be secured, thereby maximizing the utilization. In addition, it is possible to stabilize the soft ground and to improve the bearing capacity by the surface layer plate structure and the friction pile at the same time through the improvement of the deep layer and the surface layer using the stabilizer, and it is possible to reduce the replacement rate by the improvement, There is an effect that can be increased at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of a conventional soft ground replacement method,
FIGS. 2 to 5 are step-by-step structural diagrams of a soft ground stabilizing structure using a stabilizer and geosynthetic fibers according to an embodiment of the present invention,
Fig. 6 is a perspective view of the arrangement of the geosynthetic fibers and the geo-fiber fixing units,
7 is a flowchart of a method for stabilizing soft ground using a stabilizer and geosynthetic fibers according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment is a case where a person can walk or enter a construction machine.

FIGS. 2 to 5 are schematic structural views of the soft ground stabilizing structure using the stabilizer and the geotextile according to an embodiment of the present invention, FIG. 6 is a perspective view of the arrangement between the geotextile and the geotextile fixing unit, 7 is a flowchart of a method for stabilizing soft ground using a stabilizer and geosynthetic fibers according to an embodiment of the present invention.

Referring to these drawings, the soft ground stabilizing structure of the present invention is a structure using a stabilizer and geotextile. Referring to FIGS. 5 and 6, the soft ground stabilizing structure of the present invention is formed of a lattice- And the soil fiber and the stabilizer of the soft layer are mixed and stirred with a stirring device, or after a hammer grab excavation using an auger excavator or an oscillator, And a soil stabilizing layer in the form of a pile, and a geotextile fixing unit 120 for fixing the deep stabilized layer and the geotextile stabilizing layer. Also, instead of the geosynthetic fiber, a bamboo mat (not shown) formed by lattice-shaped net structure and formed by weaving at least one bamboo that is formed in the surface portion of the improved soft ground, have. However, in the embodiment of the present invention, the use of the geoscientific fibers 110 will be described as an example.

The geosynthetic fibers 110 are installed in the upper part of the so-called stabilized layer, that is, the surface area of the soft ground, which is obtained by modifying the soft ground by mixing the stabilizing agent on the soft ground above the support layer.

In the case of this embodiment, two layers of geosynthetic fibers 110 are used in a layered arrangement, but the scope of rights of the present invention can not be limited to such matters.

The geo-fiber fixing unit 120 includes a head portion 121, a conical insertion portion 122 disposed on the opposite side of the head portion 121, and a connecting portion 122 connecting the head portion 121 and the conical insertion portion 122 And is inserted into the through hole 111 of the geosynthetic fiber 110 to fix the geosynthetic fiber 110. [

Hereinafter, the construction procedure according to the type of the soft ground in the present invention will be described.

As shown in FIG. 2, the soft soil layer and the stabilizer of the soft layer are mixed and agitated by a stirring device as shown in FIG. 2, or after the excavation of a hammer graft using an auger or an oscillator, The mixed material or the crushed stone aggregate is filled and compaction to form a pile-shaped stabilizing layer (S11).

Next, as shown in FIG. 4, a soft ground improvement step of modifying the soft ground by mixing a stabilizing agent on the soft ground above the support layer; The soft ground surface layer stabilizing step for stabilizing the soft ground surface layer portion is performed by placing the geoscientific fibers 110 formed in a lattice-like net structure and having a plurality of through holes 111 formed on the flat surface thereof at the surface layer portion of the soft ground (S12).

5, a head portion 121, a conical insertion portion 122 disposed on the opposite side of the head portion 121, and a shaft portion 123 connecting the head portion 121 and the conical insertion portion 122 It is possible to easily finish the construction by advancing the geotextile fixing step of fixing the geotextile 110 by inserting the geotextile fixing unit 120 having the geotextile fixing unit 120 into the through hole 111 of the geotextile 110 .

The stabilizer used in the present invention will be further described. When selecting a stabilizer, cement and lime are most commonly used in terms of economy / construction. However, if the soft ground is clayey or contains organic components, the improvement effect may not be good with a single cement. In case of lime-based slurry, the improvement effect is lowered. Generally, lime, slag, fly ash, And mixed.

As described above, the above embodiment is a case where a person can walk or enter a construction machine. In the case of super soft ground, which is difficult for people to walk or enter into construction equipment, improvement should be made in the above procedure and stabilization phase of soft ground by using geosynthetics should be given priority.

The present invention can be differentiated from the prior art, in particular, the Korean Intellectual Property Office Registration No. 10-065761 as compared to the prior art.

First, since the present invention is a method of stabilizing a soft ground using a stabilizer and geosynthetics (110), it is possible to utilize the merits of a mixed treatment method, a geotextile reinforcement method, and a pile support surface, Which is far superior to the prior art.

Second, the present invention relates to a method for stabilizing a soft ground and a method for stabilizing a surface layer plate by supporting a top load by forming a rigid platy structure using a modified layer mixed with a stabilizer at a surface layer of a soft ground, Structure and friction pile can be simultaneously used to reduce the substitution rate due to the mixing treatment. Therefore, it is much more advantageous than the prior art in the stability of the soft ground.

Third, techniques for stabilization of soft ground, such as a top improvement method and a geotechnical fiber laying method, already exist, but the present invention relates to a technique for a geotextile reinforcing material for applying the upper improvement method and a geotextile (110) It is much more advantageous than the conventional technology in the stable surface of the soft ground.

Fourth, since the surface layer improvement layer and the lower improvement layer are connected to each other by the geosynthetic fiber and the civil engineering fixation unit, the bottom improvement method can be freely adjusted according to the site requirements.

As described above, the present invention relates to a method and structure for improving and stabilizing a surface layer of a softer soil using a stabilizer and geosynthetics 110, and a structure thereof. The core of the method is that it does not improve the entire soft ground, By forming a plate-like structure having rigidity by using the modified layer mixed with the stabilizer in the surface layer of the ground and the geosynthetic fibers 110 and supporting the upper load through the geosynthetic fiber fixing unit 120, In order to achieve the goal.

If such a method can be generalized, it will be more advantageous to carry out business for construction of large-scale ports, new cities, industrial complexes and airports on weak grounds such as domestic and overseas coasts and dredged landfills.

As described above, according to the present embodiment, the soft ground can be stabilized by a simple and efficient structure and method, and the utilization can be maximized.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

110: Geo fiber
111: Through hole
120: geo-fiber fixing unit
121:
122: conical insert
123: Shaft

Claims

The soil and the stabilizer are mixed and agitated on the soft ground at the upper part of the support layer or the stabilizer is mixed with the material or the crushed stone aggregate mixed with the hammer gravure after excavation using an auger excavator or oscillator to form a pile- ;
At least one geosynthetic fiber formed by lattice-like network structure and having a plurality of through holes formed on the surface thereof is placed on the stabilizing layer of the soft ground surface layer portion by stabilizing the surface layer portion by mixing the stabilizing agent in the soft ground portion of the surface layer portion, A soft ground surface stabilization step for stabilizing the soft ground;
And a fixing step of inserting a fixing unit having a head portion, a conical insertion portion disposed on the opposite side of the head portion, and a shaft portion connecting the head portion and the conical insertion portion into the through hole of the geoscientific fiber Stabilization method of soft ground using stabilizer and geosynthetics.

At least one geosynthetic fiber which is formed in a lattice-like net structure and has a plurality of through-holes formed on its surface, And
And a shaft portion connecting the head portion and the conical insertion portion, the insertion portion being inserted into the through hole of the geosynthetic fiber so that the geosynthetic fiber is inserted into the stabilization layer of the soft ground surface layer portion, And a fixing unit for fixing the reinforcing member to the soft ground supporting structure.

3. The method of claim 2,
Wherein the geosynthetic fiber further comprises a bamboo mat formed by laminating a plurality of bamboos and having a lattice-like net structure and having a plurality of through holes formed on the plate surface, the soft ground stabilization structure using the stabilizer and the geosynthetic fibers.