KR20140017381A - A reinforcement method of a foundation structure used a micro pile - Google Patents

A reinforcement method of a foundation structure used a micro pile Download PDF

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Publication number
KR20140017381A
KR20140017381A KR1020120084428A KR20120084428A KR20140017381A KR 20140017381 A KR20140017381 A KR 20140017381A KR 1020120084428 A KR1020120084428 A KR 1020120084428A KR 20120084428 A KR20120084428 A KR 20120084428A KR 20140017381 A KR20140017381 A KR 20140017381A
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KR
South Korea
Prior art keywords
concrete
micro pile
foundation
hole
pile
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KR1020120084428A
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Korean (ko)
Inventor
황판용
이병희
황기수
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황판용
이병희
황기수
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Priority to KR1020120084428A priority Critical patent/KR20140017381A/en
Publication of KR20140017381A publication Critical patent/KR20140017381A/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/01—Flat foundations
    • E02D27/08—Reinforcements for flat foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/28—Stressing the soil or the foundation structure while forming foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The purpose of the present invention is to provide a method for reinforcing a foundation structure using a micro pile, wherein the method is to simplify the reinforced structure of foundation concrete in order to easily reinforce the foundation structure; to form a drilled hole in order to minimize a cross-sectional loss; to stably support the bottom of the foundation concrete as much as a predetermined width; to prevent the generation of pile punching shear due to the installation of the micro pile; and to allow the foundation concrete to integrally behave with reinforcing concrete when a displacement is generated in the ground. To accomplish the purpose, the method comprises: a step of forming the drilled hole (12b) with a small diameter from the upper surface of the reinforced part of the foundation concrete (10) to the lower surface of the reinforced part of the foundation concrete (10) in order to install the micro pile; a step of forming a drilled hole (12a) with a large diameter and a larger width than the width of the drilled hole (12b) at the lower side of the drilled hole (12b) and in the ground (24) as much as a predetermined depth in order to install a concrete bulb supporting the bottom of the foundation concrete (10) as much as the predetermined width; a step of installing a hollow circular casing (23) at the bottom of the drilled hole (12a) and in the ground as much as a predetermined depth in order to install the micro pile (22); a step of sequentially fastening a lock nut (21), a base plate (20), and a lock nut (21) to the male-threaded outer circumferential surface of the micro pile (22), and installing the micro pile (22) in the casing (23); and a step of filling the reinforcing concrete in the drilled holes.

Description

A reinforcement method of a foundation structure used a micro pile}

The present invention forms a small diameter drilled hole enough to install a micro pile in the foundation structure when subsidence occurs in the foundation structure and reinforces it, and a drill hole of a large diameter is formed on the bottom of the foundation structure to support it. The present invention relates to a reinforcement method of a foundation structure using micro piles capable of supporting and reinforcing the settled foundation structure by forming concrete bulbs.

In general, when subsidence, cracks, etc. occur in the foundation structure to reinforce it, as shown in the prior art Figures 1a, 1b, the width of the width 500 to 700mm to install the base plate 20 in the reinforcement portion of the foundation concrete A rectangular perforated hole is formed, and a circular casing 23 having a hollow part is installed on the bottom of the foundation structure so that the micro pile 22 can be installed.

On the side of the rectangular boring hole, the reinforcing bar is fixed to the foundation concrete (not shown), and the micro pile having male threads formed on the outer circumferential surface to which the lock nut 21 and the base plate 20 and the lock nut 21 are sequentially fastened. 22 is installed in the center of the drilling hole, the end of the micro pile 22 is inserted into the casing 23 and installed on the ground, and then filled the reinforcement concrete 11 in the rectangular drilling hole to support the foundation structure do.

However, in the conventional micro pile upper fixing method, the cross-sectional loss of the foundation concrete is increased by forming a wide drilling hole for installing the micro pile, and the pile punching shear (pile punching) at the coupling site as the reinforcement concrete is coupled to the foundation concrete. shear) is likely to occur,

It is not easy to fix the reinforcing bars to the foundation concrete in the rectangular hole, the noise and dust generated by the crushing of the foundation concrete to form the drilling hole, the construction period is long due to the curing of the reinforced concrete There is a problem.

Another prior art micro pile top fixing method (Patent No. 868987) using a key plate is shown in FIGS. 2A to 2D. FIG. 2A is a cross-sectional view showing that a micro pile is installed in a drilling hole. 2b is a plan view showing that the key plate installed on the micro pile is installed on the bottom of the base concrete,

FIG. 2C is a cross-sectional view illustrating a process of installing a micro pile using a jig, and FIG. 2D is a cross-sectional view illustrating a key plate supporting a bottom of a base concrete and a reinforcing concrete is filled in a drilling hole provided with a micro pile.

In FIGS. 2A and 2B, a drill hole is formed in the reinforcement part of the foundation concrete 10 using a core drill. The drill hole includes a central large diameter hole 12a and two small diameter holes on both sides thereof. It is formed by the hole 12b.

The micro file 22 is installed in the large diameter hole 12a, and the micro file is formed of a steel rod having male threads formed on an outer circumferential surface thereof. The micro file 22 has a coupler 26 and a key plate 25. , key plates) are sequentially fastened and inserted into the large diameter hole 12a and the small diameter hole 12b.

The key plate 25 is formed in a structure of a straight steel bar (bar) passing through the large diameter hole 12a and the small diameter hole 12b, the key plate 25 is the micro pile 22 It is fastened to and supported by the coupler 26.

2C and 2D, the micro pile 22 is rotated using the jig 27 and jig to be fixed to the ground of the lower portion of the foundation concrete 10, and the key plate 25 is the foundation using the jig 27. After rotating to be located on the bottom surface of the concrete (10), the upper coupler 26 is rotated on the upper portion of the key plate 25 to be fixed to the upper surface of the key plate 25, and then the large diameter hole 12a and small diameter The hole 12b is filled with reinforcement concrete 11 to reinforce the foundation structure.

The conventional micro pile upper fixing method using the above-mentioned key plate requires precise drilling to form a large diameter hole in the center and two small diameter hole on both sides thereof, and a key plate must be manufactured separately. In addition, the heavy key plate makes installation difficult,

In order to install the micro pile, a jig, which is a position adjusting mechanism, should be used, and if a displacement occurs in the ground, the shape of the perforation hole is easily damaged, and the support structure of the key plate is unstable, so that the bottom of the foundation concrete cannot be widely supported. .

The present invention, in order to solve the problems of the prior art, to simplify the reinforcement structure of the foundation concrete, to form a perforation hole to minimize the cross-sectional loss, to stably support the bottom surface of the foundation concrete reinforcement portion to a predetermined width,

In addition, to prevent the occurrence of pile punching shear due to the installation of the micro pile, and to provide a reinforcement method of the foundation structure using a micro pile that can act as a foundation concrete and reinforcement concrete when displacement occurs in the ground.

The present invention is provided to achieve the above object is a step of forming a small hole diameter hole 12b from the upper surface to the lower surface of the reinforcement portion 10 so that the micro pile can be installed;

In order to install concrete bulbs supporting the lower surface of the foundation concrete 10 with a predetermined width, the width of the foundation concrete 10 is wider than the perforation hole 12b of the small diameter so as to have a predetermined depth. Forming a large diameter hole 12a in 24;

A step of installing a circular casing (23) having a hollow portion at a predetermined depth in the ground so that the micro pile (22) can be installed on the bottom of the large diameter hole (12a); A lock nut (21), a base plate (20) and a lock nut (21) are sequentially fastened to the micro pile (22) having male threads formed on an outer circumferential surface thereof, and the micro pile (22) is installed on the casing (23); And reinforcing concrete 11 is filled in the drill holes of the small diameter and the large diameter.

The reinforcement method of the foundation structure using the micro pile of the present invention as described above to form a small diameter boring hole with a minimum width that can be installed micro pile to minimize the cross-sectional loss of the foundation concrete, concrete bulb on the bottom of the foundation concrete reinforcement It is effective to stably support the foundation concrete to a predetermined width by forming a.

In addition, when displacement occurs on the ground, the reinforcement concrete is formed in the inverted T shape to support the foundation concrete, so that the foundation concrete and the reinforcement concrete are integrated and act on the bottom of the foundation concrete. Prevent the occurrence of pile punching shear,

By forming a small diameter hole to minimize noise and dust during drilling, and by simplifying the reinforcing structure of the foundation structure, the workability is improved and the air is shortened.

Figure 1a is a plan view showing that the conventional micro pile is installed in the drilling hole
Figure 1b is a cross-sectional view showing that the conventional micro pile is installed on the ground and the reinforcement concrete is filled in the drilling hole
Figure 2a is a cross-sectional view showing that another conventional micro pile is installed in the drilling hole
Figure 2b is a plan view showing that the key plate installed in another conventional micro pile is installed on the bottom of the base concrete
Figure 2c is a cross-sectional view showing a process for installing another conventional micro pile using a jig
Figure 2d is a cross-sectional view showing that another conventional key plate supports the bottom of the base concrete, and the reinforcement concrete is filled in the drill hole in which the micro pile is installed
Figure 3a is a plan view showing that the micro pile is an embodiment of the present invention is installed in the drilling hole
Figure 3b is a cross-sectional view showing an embodiment of the present invention, large, small diameter hole drilling is formed
Figure 3c is a cross-sectional view showing that the micro pile is an embodiment of the present invention is installed in the drilling hole
Figure 3d is a cross-sectional view showing that the reinforcement concrete is filled in the drilling hole in which the micro pile is an embodiment of the present invention

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention minimizes the cross-sectional loss by forming a small diameter boring hole in the foundation concrete to install the micro pile, the foundation concrete base is supported by a predetermined width by the concrete bulb, even if the ground displacement occurs Support stably,

The foundation concrete concrete surface is formed on the bottom of the foundation concrete to prevent punching shear of reinforcement concrete due to the installation of micro piles, and the reinforcement concrete is formed in an inverted T shape so that the foundation concrete and reinforcement concrete are integrated. It is improved, and the technical features that the workability is improved by simplifying the reinforcement structure for the foundation structure.

Figure 3a is a plan view showing that the micro file is an embodiment of the present invention is installed in the drilling hole, Figure 3b is a cross-sectional view showing a large diameter hole is formed, which is an embodiment of the present invention, Figure 3c One embodiment is a cross-sectional view showing that the micro file is installed in the drilling hole, Figure 3d is a cross-sectional view showing that the reinforcement concrete is filled in the drilling hole in which the micro file is an embodiment of the present invention.

3a, 3b using a core drill in the center of the reinforcement portion of the base concrete (10) to form a small hole diameter hole 12b from the upper surface of the base concrete to the bottom surface, the small diameter hole hole of the basic concrete ( In the bottom of 12b), a large diameter boring hole 12a is drilled to a predetermined thickness so as to support the bottom of the foundation concrete 10 with a predetermined width, thereby forming an inverted T-shaped boring hole as a whole.

In FIG. 3C, a circular casing 23 having a hollow portion is drilled into the ground from the bottom of the large diameter hole 12a so that the end of the micro pile 22 can be supported on the ground. The micro pile 22 having the lock nut 21, the base plate 22, and the lock nut 21 successively fastened to the formed micro pile 22 is inserted into the casing 23 via a drilling hole.

In FIG. 3D, the reinforcing concrete 11 is filled in the drilled hole in which the micro pile 22 is installed to integrate the basic concrete 10 and the reinforcing concrete 11. The reinforcement concrete 11 filled in the large-diameter perforation stably supports the bottom surface of the foundation concrete 10 submerged into the concrete bulb with a predetermined width, and when the displacement occurs on the ground, the reinforcement concrete having an inverted T shape is based. Since it is integrated with concrete and behaves, the stability of the foundation structure is improved.

The inverted T-shaped reinforcement structure of the present invention prevents punching shear through micro pile installation, minimizes cross-sectional loss of the foundation concrete, and reinforcement concrete supports the foundation concrete to a predetermined width, compared to the conventional micro pile upper fixing method. There is a technical feature that improves the stability of the foundation structure.

In addition, the present invention is easy to drill by forming a small-diameter boring hole, compared to the conventional micro pile upper fixing method using a key plate (key plate), the reinforcing structure is simple, without using a jig to install the key plate Construction is easy,

When displacement occurs in the ground, reinforcement concrete is formed in an inverted T shape to support the bottom of the foundation concrete, thereby improving stability of the foundation structure, and having technical characteristics of preventing punching shear of the foundation concrete through micro pile installation.

10: foundation concrete 11: reinforced concrete
12a: large diameter drilled hole 12b: small diameter drilled hole
20: base plate 21: lock nut
22: micro pile 23: casing
24: Ground 25: Key plate
26 coupler 27 jig

Claims (1)

Forming a small diameter hole 12b from an upper surface to a lower surface of the reinforcement part of the base concrete 10 so that the micro pile can be installed;
In order to install concrete bulbs supporting the lower surface of the foundation concrete 10 with a predetermined width, the width of the foundation concrete 10 is wider than the perforation hole 12b of the small diameter so as to have a predetermined depth. Forming a large diameter hole 12a in 24;
A step of installing a circular casing (23) having a hollow portion at a predetermined depth in the ground so that the micro pile (22) can be installed on the bottom of the large diameter hole (12a);
A lock nut (21), a base plate (20) and a lock nut (21) are sequentially fastened to the micro pile (22) having male threads formed on an outer circumferential surface thereof, and the micro pile (22) is installed on the casing (23); And
Reinforcing concrete (11) is filled in the drill hole of the small diameter and the large diameter; foundation structure reinforcement method using a micro pile.
KR1020120084428A 2012-08-01 2012-08-01 A reinforcement method of a foundation structure used a micro pile KR20140017381A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101470796B1 (en) * 2014-07-18 2014-12-08 김정인 Method of reinforcing existing footing structure using micropile and structure thereof
KR102092514B1 (en) 2019-11-21 2020-03-23 황판용 Ground drilling method for foundation reinforcement
KR102324536B1 (en) * 2020-09-08 2021-11-10 건설플러스(주) Preferred load method of foundation structure for loading design load in advance of additional reinforced foundation structure and apparatus of the same
KR102382028B1 (en) * 2021-12-02 2022-04-01 (주)진영컨설턴트 Preloading method for reinforcing pile by total lifting
KR20230052769A (en) 2021-10-13 2023-04-20 황판용 Concrete Reinforcing Method Using Reaction Anchor
KR102619673B1 (en) 2023-01-30 2023-12-29 에이에이아키그룹건축사사무소 주식회사 Concrete Reinforcing Method Using Micropile And Dispersion Plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101470796B1 (en) * 2014-07-18 2014-12-08 김정인 Method of reinforcing existing footing structure using micropile and structure thereof
KR102092514B1 (en) 2019-11-21 2020-03-23 황판용 Ground drilling method for foundation reinforcement
KR102324536B1 (en) * 2020-09-08 2021-11-10 건설플러스(주) Preferred load method of foundation structure for loading design load in advance of additional reinforced foundation structure and apparatus of the same
KR20230052769A (en) 2021-10-13 2023-04-20 황판용 Concrete Reinforcing Method Using Reaction Anchor
KR102382028B1 (en) * 2021-12-02 2022-04-01 (주)진영컨설턴트 Preloading method for reinforcing pile by total lifting
KR102619673B1 (en) 2023-01-30 2023-12-29 에이에이아키그룹건축사사무소 주식회사 Concrete Reinforcing Method Using Micropile And Dispersion Plate

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