KR101635529B1

KR101635529B1 - Composite pile construction method

Info

Publication number: KR101635529B1
Application number: KR1020150161184A
Authority: KR
Inventors: 이강수
Original assignee: 이강수; 주식회사 지오이엔비
Priority date: 2015-11-17
Filing date: 2015-11-17
Publication date: 2016-07-04

Abstract

The present invention relates to a composite pile construction method capable of improving the load resistance performance of an earth surface section using an outer pipe while securing the tip endurance of the micro pile by means of an inner pipe and a steel bar and securing workability and workability. The outer steel pipe and the inner steel pipe 122 are integrated by using an outer steel pipe end closing member so as to surround the inner steel pipe so as to extend to the toe layer G1 on the head of the steel pipe, The steel pipe body and the lower steel pipe body are integrated, and the upper steel pipe body is formed into a double pipe shape.

Description

{COMPOSITE PILE CONSTRUCTION METHOD}

The present invention relates to a composite file construction method. More specifically, the present invention relates to a composite pile construction method capable of improving load resistance performance of an earth surface section by using an outer pipe while securing the end support force by an inner pipe and a steel rod in a micro file, and securing workability and workability.

FIG. 1A is a construction cross-sectional view of a composite pile capable of securing a conventional end support force and a main surface friction force.

A steel pipe 30 installed to be inserted into the perforation hole 50 formed in the ground and having a tip supporting plate 31 at the tip thereof; A fixing device 20 installed to be supported on the upper surface of the front end support plate 31 of the steel pipe 30 and a small diameter pile device 50 set to be disposed inside the steel pipe 30 and the perforation hole 50 through the front end support plate 31, (10); And a grouting material 40 injected into the perforation hole 50 and the steel pipe 30 so as to be embedded in the small diameter filament body 10. The fixing device 20 and the steel pipe 30, The small diameter pile 10 can secure the leading end supporting force by the steel pipe by the front end closing effect by the leading end supporting plate 31 and the grouting material 40 formed at the lower portion of the fixing device 20. [

In other words, by providing a composite file that exploits the advantages of conventional micro-files and small-diameter steel pipe files using conventional steel bars, it is possible to provide a composite file in which, in contrast to designs based on double use of steel materials such as micro- It is possible to construct a small-diameter pile construction which is more economical. Further, the present invention can drastically reduce the installation amount of the small-diameter piles required for securing frictional force on the main surface as the leading end supporting force can be secured.

Further, FIG. 1B shows an example of using a double tube in a conventional compound file.

That is, the microfilm 61 is disposed in the center of the inner pipe 62 using the gap 63 inside the inner pipe 62,

Particularly, the outer pipe 64 is further disposed at the upper end of the micro pile 61 in the vicinity of the foundation 70, so that it is understood that the resistance against the bending moment acting near the ground surface is sufficiently secured.

However, there is a problem in that the microfiles constructed in the conventional compound file format are subjected to a process of separately constructing each of the microfiles so that there is a limit in workability and workability. Also, the outer tube 64 provided near the base has no connection device with the inner tube, so that it is difficult to view the outer tube 64 as a pile formed integrally with the inner tube 62.

Accordingly, it is an object of the present invention to provide a composite file construction method capable of sufficiently securing a leading end supporting force in the construction of a microfilm in the form of a double pipe, improving the workability and minimizing the work in the field, do.

In order to solve the above problems,

(a) forming a perforation hole in the soil layer G1 and inserting the steel pipe as a lower steel pipe body first; (b) Connect the inner steel pipe to the toe layer (G1) at the top of the exposed steel pipe at the top of the surface of the earth, and wrap the outer steel pipe with the inner steel pipe. The upper steel pipe and the lower steel pipe are integrated so that the upper steel pipe has a double pipe shape; (c) drilling the support layer G2 by inserting the drill bit into the inner steel pipe and the lower steel pipe, and inserting the integrated lower steel pipe body so as to extend to the inside of the hole formed in the support layer G2; (d) inserting the micropile into the upper steel pipe and the lower steel pipe so as to extend to the perforation hole (H2), and installing the injection pipe so as to extend to the perforation hole of the support layer (G2); (e) The grouting material G injected through the injection pipe is injected into the space between the perforation hole H2 of the support layer G2, the inner steel pipe of the upper steel pipe body, the inner steel pipe and the outer steel pipe, step; And (f) setting a top surface of an outer steel pipe and an inner steel pipe, that is, a top surface of an upper steel pipe, with a steel pipe head reinforcement plate so that the micropile extends upward, Provided is a method for constructing a composite pile, in which reinforced concrete is laid and a foundation is laid by placing foundation concrete.

Also,

(a) connecting a steel pipe as an upper steel pipe body and an outer steel pipe as an upper steel pipe body to each other; (b) inserting a drill bit into the lower steel pipe and the upper steel pipe integrated with each other to penetrate the support layer G2 to reach the upper surface of the support layer G2 while forming the perforation hole H2; (c) In order to reinforce the ground surface area, the upper inserted steel pipe is further inserted into the outer steel pipe to extend to the ground layer G1, the micro pile is inserted into the upper inserted steel pipe up to the supporting layer G2, (G2); (d) The grouting material G injected through the injection pipe is injected and hardened into the space between the inner hole of the lower steel pipe body and the upper steel pipe body, the upper steel pipe body and the upper inserted steel pipe, ; And (e) setting a steel pipe head reinforcement plate on the upper surface of the upper and lower steel pipes so that the micropile extends upward. After the steel pipe is laid so that the head of the micropile is embedded, The present invention provides a method of constructing a composite pile, in which concrete is laid so that a foundation is constructed.

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The composite file according to the present invention is constructed in the form of a double pipe near the earth surface so that the load can be calculated by the following equation (1): the tip end load (P1) of the micropile, the frictional force (T) between the compound file and the surrounding ground, It is possible to effectively support the bending moment due to the earth pressure near the earth surface, the earthquake force, etc., while ensuring the integrity with the foundation effectively.

FIG. 1A is a construction sectional view of a composite file capable of securing a conventional end support force and a main surface friction force
FIG. 1B is a cross-sectional view of a composite pile construction,
FIG. 2A is a construction cross-sectional view and an extracted perspective view of a composite file according to Embodiment 1 of the present invention,
FIG. 2B is a construction sectional view and an extracted perspective view of a composite file according to Embodiment 2 of the present invention, FIG.
FIG. 2C and FIG. 2D are a construction cross-sectional view, an exploded perspective view, and an installation cross-sectional view of an inner steel pipe connector according to a third embodiment of the present invention,
Figs. 3A and 3B are installation sectional views of the head reinforcement means of the present invention,
FIGS. 4, 5, and 6 are flowcharts of the construction of the compound file according to the first, second, and third embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Compound file (100) of the present invention]

FIGS. 2A, 2B, and 2C are partial cross-sectional views of a construction file of the composite file 100 of the present invention, and FIG. 2D is an example of installation of an inner steel pipe connector in the third embodiment of the present invention.

The compound file 100 according to the present invention will be described as follows in the first, second, and third embodiments.

[Embodiment 1: Compound File (100)]

As shown in FIG. 2A, the composite file 100 according to the first embodiment includes a microfiber 110, an upper steel pipe 120, and a lower steel pipe 130.

First, the micro pile 110 is a structural steel rod having a sled (threaded portion) formed on the outer circumferential surface thereof as an internal pile body. These structural steel rods are made to have a predetermined length and are connected to each other using a coupler to prepare a desired length.

2A, the perforation hole H previously formed in the ground penetrates through the soil layer G1 and extends to the support layer G2.

Accordingly, the microfiber 110 has an extension length so that the tip portion extends to the inside of the support layer G2, so that the microfilm 110 effectively transmits the load to the support layer G2.

The top end pressure plate 143 is also fastened to the head of the microfilm 110 by means of the fixing nuts 141 and 142. This is referred to as a head fixing apparatus 140 in the present invention.

The head fixing device 140 is embedded in the base 200 by various head reinforcement means 300 to be described later so as to secure the structural integrity between the base 200 and the compound file 100, As shown in FIG.

The upper steel pipe 120 and the lower steel pipe 130 are separately manufactured and inserted into the perforation hole H by being connected to each other.

The upper steel pipe 120 is formed by integrating the outer steel pipe 121 and the inner steel pipe 122,

The outer steel pipe 121 uses a steel pipe having a diameter corresponding to the diameter of the hole H, and it is preferable to use a steel pipe having a larger thickness than the inner steel pipe 122 described later. It can be said that this is for load resistance near the ground surface.

The inner steel pipe 122 uses a steel pipe having a diameter smaller than that of the outer steel pipe 121 and the extension length L1 of the inner steel pipe is formed to be slightly longer than the extension length L2 of the outer steel pipe 121, And the lower end of the inner steel pipe is projected further downward than the lower end of the outer steel pipe with reference to the steel pipe top reinforcement plate 123 provided on the upper surfaces of the inner steel pipe.

The lower end of the outer steel pipe 121 is connected to the lower outer peripheral surface of the inner steel pipe 122 at the lower end thereof, An outer steel pipe front end closing member 124 such as a horizontal ring is formed integrally with the outer steel pipe 121 so that the lower end of the outer steel pipe 121 is closed and integrated with each other.

At this time, the space between the inner side surface of the outer steel pipe 121 and the outer circumferential surface of the inner steel pipe 122 is closed by the steel pipe head reinforcement plate 123 in the upper part and closed by the outer steel pipe end closing part 124 Thereby forming a double tube shape.

The upper steel pipe body 120, in which the outer steel pipe 121 and the inner steel pipe 122 are integrated with each other, is preliminarily manufactured in the form of a double pipe so as to more effectively resist bending moment (due to earth pressure, seismic force, etc.) Since the lower end of the outer steel pipe 121 is larger than the diameter of the inner steel pipe 122 and is closed and closed, the end supporting force can be secured.

Next, the lower steel pipe body 130 is welded (W) or bolted (not shown) to the steel pipe having the same diameter as the inner steel pipe 122 by using the steel pipe 131 for extending the inner steel pipe 122 As shown in FIG.

2A, it can be seen that the lower steel pipe body 130 is constructed so as to extend to the inside of the support layer G2. The upper steel pipe body 120 extends downward from the ground surface to a certain depth, It can be seen that the head portion of the head 120 is installed to be embedded in the base 200.

The grouting material G is disposed in the perforation hole H2 of the support layer G2, in the lower steel pipe body 130, the inner steel pipe 122 of the upper steel pipe body 120, the inner steel pipe 122 and the outer steel pipe 121 And the curing of the composite file 100 according to the present invention.

Therefore, the composite file 100 according to the first embodiment of the present invention is constructed such that the frictional force T between the end supporting force P1 by the micro-file 110, the frictional force between the composite file and the surrounding ground, P2 can effectively support the load and can effectively secure the integrity with the foundation 200 while effectively restricting the bending moment due to the earth pressure and the seismic force near the ground surface.

[Embodiment 2: Compound File (100)]

As shown in FIG. 2B, the composite file 100 according to the second embodiment includes a microfiber 110, an upper steel pipe body 120, and a lower steel pipe body 130, The connection structure of the lower steel pipe body 120 and the lower steel pipe body 130 is somewhat different.

First, the microfiber 110 is a structural steel bar which is not different from Embodiment 1 and has a sled (threaded portion) on the outer circumferential surface as an inner pile body. These structural steel rods are made to have a predetermined length and are connected to each other using a coupler to prepare a desired length.

As shown in FIG. 2B, the perforation hole H previously formed in the ground penetrates through the soil layer G1 and extends to the support layer G2 as well.

The extension length of the microfiber 110 is determined so as to extend to the inside of the support layer G2 so that the microfilm 110 effectively transfers the load to the support layer G2.

The top end pressure plate 143 is also fastened to the head of the microfilm 110 by means of the fixing nuts 141 and 142. This is referred to as a head fixing apparatus 140 in the present invention. This head fixing apparatus is embedded in the base 200 by the head reinforcement means 300 to be described later so as to more effectively reinforce the head of the microfilm 110 while securing the structural integrity of the base 200 and the composite file 100 .

Next, the upper steel pipe body 120 and the lower steel pipe body 130 are separately manufactured and connected to each other to be inserted into the perforation holes.

The upper steel pipe 120 is formed of an outer steel pipe 121 and is connected to the lower steel pipe 130 to be described later. As shown in FIG. 2B, the outer steel pipe 121 has a diameter It is preferable to use a steel pipe having a larger thickness than the lower steel pipe 130 to be described later. It can be said that this is for load resistance near the ground surface.

In the second embodiment, the inner steel pipe 122 of the first embodiment is not adopted, and the upper steel pipe 120 is formed as a single pipe rather than a double pipe. However, It can also be in the form of. This is illustrated in FIG. 5C, and is used as a more efficient and economical composite file when the earth pressure near the surface of the earth is not large.

Thus, the steel pipe head reinforcement plate 123 is integrally formed on the upper surface of the outer steel pipe 121 to facilitate centering of the micro pile.

The upper steel pipe body 120 integrated with the outer steel pipe 121 and the steel pipe head reinforcement plate 123 can be manufactured in advance to more effectively resist a relatively small bending moment (due to earth pressure, seismic force, etc.) While the lower end of the outer steel pipe 121 is reduced in section by the pipe connecting device 160, so that the end supporting force can be secured.

That is, in the second embodiment, it can be seen that the tube connecting device 160 is used to further secure the leading end supporting force in the middle of the compound file.

Next, the lower steel pipe 130 uses a steel pipe 131 for extending the outer steel pipe 121, and connects the steel pipe having a smaller diameter than the outer steel pipe 121 to each other through the pipe connecting device 160 .

Referring to FIG. 2B, it can be seen that the pipe connecting device 160 can be formed of internal and external connecting devices.

The inner connecting device 160a is an inner connecting port inserted into the inner surface of the lower end of the upper steel pipe 120. The upper connecting pipe 161a is formed to match the inner diameter of the upper steel pipe 120, The upper and lower steel pipes 120 and 120 are vertically connected to each other by a method in which the lower steel pipe 130 is inserted into the outer circumferential surface of the upper steel pipe 120, 110 formed in the center hole.

The outer connector 160b is an outer connector inserted into the outer surface of the lower end of the upper steel pipe 120. The upper connector 161b is formed to match the outer diameter of the upper steel pipe 120, The outer steel pipe 121 as the upper steel pipe 120 and the steel pipe as the lower steel pipe 130 are vertically connected to each other simply by inserting the lower steel pipe 130 into the inner circumferential surface. Economical.

The lower end of the upper steel pipe 120 is formed as an insert socket portion 161c having a smaller diameter and the upper end of the lower steel pipe 130 is inserted into the insert socket portion 161c, A method of fastening the insertion socket portion 161c and the lower steel pipe 130 to each other can also be used.

2b, it can be seen that the lower steel pipe body 130 is constructed so as to extend to the upper surface of the support layer G2. The upper steel pipe body 120 extends downward from the ground surface to a certain depth, It can be seen that it is also installed so as to be embedded in the housing 200.

The grouting material G is injected into the perforation hole H of the support layer, the lower steel pipe 130 and the outer steel pipe 121 of the upper steel pipe 120 to be hardened, It can be seen that.

Thus, the composite file 100 according to the second embodiment of the present invention is constructed such that the end support force P1 by the micro file 110, the frictional force T between the composite file and the surrounding ground, the end support force of the lower end of the outer steel pipe 121 P2 effectively protects the bending moment due to the earth pressure and seismic force in the vicinity of the earth's surface while ensuring the integrity with the foundation 200 effectively.

[Embodiment 3: Compound File (100)]

As shown in FIG. 2C, the composite file 100 according to the third embodiment includes a microfiber 110, an upper steel pipe 120, and a lower steel pipe 130, And an inner steel pipe 122 formed integrally with the inner pipe 110 is used.

First, the microfiber 110 is a structural steel bar which is not different from the first and second embodiments and has a sled (threaded portion) on the outer circumferential surface as an inner pile body. These structural steel rods are made to have a predetermined length and are connected to each other using a coupler to prepare a desired length.

As shown in FIG. 2C, the perforation hole H previously formed in the ground penetrates through the soil layer G1 and extends to the support layer G2 as well.

The upper steel pipe 120 and the lower steel pipe 130 are separately manufactured and inserted into the hole H by being connected to each other.

The upper steel pipe 120 is connected to the lower steel pipe 130 having a smaller diameter as described later and is formed as an outer steel pipe 121. The outer steel pipe 121 has a through hole H, and it is preferable to use a steel pipe having a larger thickness than the lower steel pipe 130, which will be described later. It can be said that this is for load resistance near the ground surface.

The upper steel pipe 120 and the lower steel pipe 130 may be made of the same diameter as that of the lower steel pipe 130, Can be connected in the same way.

The steel pipe head reinforcement plate 123 is integrally formed on the upper surface of the outer steel pipe 121 to facilitate the centering of the micro pile and can be easily lifted by the lower steel pipe 130 and the pipe connecting device 160, .

Further, the inner steel pipe 122 is formed integrally with the micro pile 110 by the pile connecting hole 150 in the third embodiment. The pile connecting hole 150 is formed on the bottom and top surfaces of the inner steel pipe, And it is understood that the upper surface is replaced with the steel pipe head reinforcement plate 123.

The diameter of the inner steel pipe 122 is formed to be smaller than the diameter of the outer steel pipe 121 of the upper steel pipe 120 and the outer steel pipe 121 of the upper steel pipe 120, It can be seen that the upper portion of the pile 110 is formed as a double pipe.

FIG. 2D illustrates an example of the file connector 150 at this time.

That is, as shown in FIG. 2D, the file connector 150

First, a circular body portion 151 formed to enclose the micro pile 110 and a rib connector 152 extending from the outer peripheral surface of the circular body portion 151 to the inner side surface of the inner steel pipe 122 may be included, The rib connecting members 152 are integrally formed on the outer circumferential surface of the circular body 151 and the grouting material is injected into the space between the rib connecting members 152. [ The file connector 150 may be installed in advance in the microfilm 110 to be installed in the perforation hole, and then the grouting material may be injected.

Also, as shown in FIG. 2D,

The grouting material is injected through the through hole formed in the horizontal plate in the form of a horizontal plate 153 extending horizontally from the inner side of the inner steel pipe 122 and formed through the center hole to penetrate the micro pile. Also, the file connector 150 may be installed in advance in the micro-file 110, and then the grouting material G may be injected into the perforation hole.

Also, as shown in FIG. 2D,

A grid structure (154) orthogonal to the inner side and the inner side of the inner steel pipe (122) is formed in the center of the inner steel pipe so as to set the micro pile, and the grouting material is injected into the inner steel pipe. Also, the file connector 150 may be installed in advance in the micro-file 110, and then the grouting material G may be injected into the perforation hole.

Also, as shown in FIG. 2D,

And a rib connecting member 156 extending from the outer circumferential surface of the circular body portion 155 to the inner side surface of the inner steel pipe 122 so as to have a predetermined extension length The grooved material G is injected into the space between the rib connecting members 152 so that the rib connecting member 152 is integrally formed on the outer circumferential surface of the circular cylindrical body 151. Also, such a file connector 150 may be installed in advance in the microfilm 110 to be installed in the perforation hole, and then the grouting material may be injected.

At this time, grouting material G may be injected into the space between the inner surface of the outer steel pipe 121 and the outer circumferential surface of the inner steel pipe 122, and the inner steel pipe may be formed into a double pipe structure synthesized with each other.

The upper steel pipe body 120 integrated with the outer steel pipe 121 and the steel pipe head reinforcement plate 123 can be manufactured in advance to more effectively resist a relatively small bending moment (due to earth pressure, seismic force, etc.) While the lower end of the outer steel pipe 121 is closed by the pipe connecting device 160, so that the end supporting force can be secured.

Next, the lower steel pipe 130 uses a steel pipe that extends the outer steel pipe 121 to easily connect the steel pipe having the same diameter as the outer steel pipe 121 to each other.

It is also understood from FIG. 2C that the pipe connection device 160 may be formed of an internal and external connection device.

The outer connector 160b is an outer connector inserted into the lower end outer surface of the upper steel pipe 120. The upper connector 161b is formed to match the outer diameter of the upper steel pipe 120, The outer steel pipe 121 as the upper steel pipe 120 and the steel pipe as the lower steel pipe 130 are vertically connected to each other simply by inserting the lower steel pipe 130 into the inner circumferential surface. Economical.

2C, the lower end of the upper steel pipe body 120 is formed as an insert socket portion 161c whose diameter is smaller, and the upper end of the lower steel pipe body 130 is inserted into the insertion socket portion 161c And the bolts are used to fasten the insertion socket portion 161c and the lower steel pipe body 130 together.

2c, it can be seen that the lower steel pipe body 130 is constructed so as to extend to the upper surface of the support layer G2. The upper steel pipe body 120 is connected to the lower steel pipe body 130, And the tofu is also installed so as to be embedded in the base 200.

The grouting material G is injected into the perforation hole H of the supporting layer, the lower steel pipe 130, the upper steel pipe 120 and the inner steel pipe 121 to be hardened, It can be seen that. At this time, when the inner steel pipe 122 is connected by the grouting material G previously injected, it is not necessary to separately inject the grouting material into the inner steel pipe.

The composite file 100 according to the third embodiment of the present invention is characterized in that the end support force P1 by the micro file 110, the frictional force T between the composite file and the surrounding ground, the end support force of the lower end of the outer steel pipe 121 P2 effectively protects the bending moment due to the earth pressure and seismic force in the vicinity of the earth's surface while ensuring the integrity with the foundation 200 effectively.

[Head reinforcement means 300 of the present invention]

Figures 3A and 3B show the head reinforcement means 300 of the present invention.

3A, a vertical reinforcement rod 310 (see FIG. 3A) is inserted between the upper pressure plate 143 and the steel pipe head reinforcement plate 123 in the micro pile 110, which is passed through the steel pipe head reinforcement plate 123 and whose head is extended upward. ) Are arranged in the direction of the arrow. The upper end of the vertical reinforcement rod 310 is passed through the upper end pressure plate 143 and is fastened on the upper surface of the upper pressure plate 143 with a fixing nut and the lower end passes through the steel pipe head reinforcement plate 123, It can be seen that it is fastened at the bottom surface of the plate 123.

At this time, it can be seen that the vertical reinforcement rods 310 are restrained by the horizontal reinforcement rods 320 spaced upward and downward.

At this time, the vertical reinforcement rods 310 are formed to bend outward to improve the bonding performance of the base concrete.

Further, it is understood that the vertical reinforcing bar 310 may extend upwardly through the upper pressure plate 143 or may bend the extended end horizontally.

Further, the vertical reinforcing bar 310 may extend below the steel pipe head reinforcement plate 123 and be installed between the outer steel pipe and the inner steel pipe or inside the inner steel pipe. Also, it can be inserted up to the section where the upper steel pipe is installed, so that it can resist the bending moment.

In this case, a plate or ring-shaped rod fixing device (not shown) for connecting a plurality of vertical reinforcing rods is provided under the vertical reinforcing rods, thereby facilitating the installation of the vertical reinforcing rods and enhancing the integrated effect with the grout.

3B, in particular, the steel pipe top plate 143 is inserted into the space between the inner steel pipe and the outer steel pipe by the lower socket connecting hole 143a,

And it can be formed in the form of an insertion tube 143b to be inserted into the head portions of the outer steel pipe. Such a downward socket connection restricts the position of the inner steel pipe and the outer steel pipe, and also serves to set the steel pipe and to easily install the steel pipe.

Further, it can be seen that the steel pipe head plate 143 can be formed to be inserted by the downward insertion fittings 143c that are fitted downward only to the outer steel pipes, or the downward insertion fittings 143d can be inserted into the inner side surfaces of the outer steel pipes (In the form of a cap).

It can be seen that such a downwardly-inserted connector can be easily installed in a simple manner and can be securely fixed with a horizontal bolt. Such downwardly-inserted connectors 143c and 143d can be easily installed in a simple manner .

[Compound file construction method]

FIGS. 4, 5, and 6 show flowcharts of a composite file construction method. This is according to Examples 1, 2, and 3.

[Method of constructing a composite file according to Embodiment 1]

First, as shown in FIG. 4A,

The steel pipe 131 as the lower steel pipe body 130 is firstly formed with a perforation hole in the soil layer G1. At this time, the perforation hole may be formed to be larger than the outer diameter of the upper steel pipe to be connected to the lower steel pipe.

Next, as shown in FIG. 4B, the inner steel pipe 122 is connected to the head of the steel pipe 131 exposed to the upper surface of the ground to extend to the toe layer G1, and the outer steel pipe 121 is wrapped around the inner steel pipe 122 So that the outer steel pipe 121 and the inner steel pipe 122 are integrated by using the outer steel pipe front end closing member 124.

As a result, the upper and lower steel pipe bodies 120 and 130 are integrated, and the upper steel pipe body 120 has a double pipe shape.

4C, a drill bit or the like not shown is inserted into the inner steel pipe 122 and the lower steel pipe 131 to penetrate the support layer G2 and the integrated lower steel pipe body 130 is inserted into the support layer G2 So that it extends into the formed hole.

As a result, the integrated upper and lower steel pipe bodies 120 and 130 according to the first embodiment are extended to the inside of the support layer G2 at the tips thereof, thereby more effectively supporting the horizontal force.

Next, as shown in FIG. 4D, the injection tube 300 including the trapezoidal tube and the like is inserted to the perforation hole of the support layer G2 in addition to the insertion of the micro pile 110 of the present invention.

4E, the grouting material G injected through the injection tube 300 flows through the perforation hole H2 of the support layer G2, the inside of the lower steel pipe body 130, the inside of the upper steel pipe body 120 The injection is performed in a space between the steel pipe 122 and the inner steel pipe 122 and the outer steel pipe 121 by using an injection pipe not shown in the drawing. It can be seen that the grouting material G injected into the grouting material G is hardened and the construction of the composite file 100 of the present invention is being performed.

Next, as shown in FIG. 4F, the steel pipe head reinforcement plate 123 is installed on the upper surface of the outer steel pipe 121 and the inner steel pipe 122, that is, the upper surface of the upper steel pipe 120, .

At this time, the top end pressure plate 143 set by the fixing nuts 141 and 142 is fastened to the head of the microfilm 110. In the present invention, the head fixing device 140 is installed,

As shown in FIG. 4F, after the foundation reinforcement is laid so that the head of the microfilm 110 is embedded, the foundation 200 is constructed by installing the foundation concrete.

3A and 3B may be further installed on the head of the micro pile 110. The head reinforcing means 300 may penetrate the steel pipe head reinforcement plate 123 and the head may be bent upward A vertical reinforcing rod 310 is disposed between the upper pressure applying plate 143 and the steel pipe head reinforcing plate 123 in the microfiber 110 extending from the lower end of the upper support pressure plate 143. The upper end of the vertical reinforcing rod 310, The upper end of the upper end pressure plate 143 and the upper end of the lower end of the upper end support plate 143 are connected to each other by a fixing nut, There will be.

Further, the vertical reinforcing bar 310 may extend below the steel pipe head reinforcement plate and be installed between the outer steel pipe and the inner steel pipe or inside the inner steel pipe. Also, it can be inserted up to the section where the upper steel pipe is installed, so that it can resist the bending moment.

In this case, a plate or ring type rod fixing device for connecting a plurality of vertical reinforcing rods is provided under the vertical reinforcing rods, thereby facilitating the installation of the vertical reinforcing rods and enhancing the integrated effect with the grout.

As described above, the compound file 100 according to the first embodiment of the present invention is characterized in that the end support force P1 by the micro-file 110, the frictional force T between the compound file and the surrounding ground, It is possible to effectively ensure the integrity with the foundation 200 while effectively supporting the load by the end support force P2 of the foundation 200 and effectively restricting the bending moment due to the earth pressure near the earth surface and the seismic force.

[Method of constructing the composite file according to the second embodiment]

The composite file construction method according to the second embodiment, as shown in FIG. 5A,

And the outer steel pipe 121 is connected to the steel pipe 131 as the lower steel pipe body 130 and the outer steel pipe 121 as the upper steel pipe body 120.

5A shows a case where the steel pipe 131 and the outer steel pipe 121 are formed to have the same diameter. In this case, when the pipe connecting device 160 is not used as shown in FIG. 2B but is connected by welding or the like do. That is, the pipe connection device 160 is for connecting steel pipes having different diameters to each other.

As shown in FIG. 5B, the lower steel pipe body 130 and the upper steel pipe body 120 integrated with each other as described above are formed by drilling the support layer G2 by inserting a drill bit or the like not shown at this time to form the perforation hole H2, And reaches and reaches the upper surface of the substrate G2.

Next, as shown in FIG. 5C, the upper inserted steel pipe 400 is inserted into the outer steel pipe 121 to extend to the ground layer G1 to reinforce the ground surface, G2 and the injection tube 300 including the trestle tube is installed so as to extend to the perforation hole of the support layer G2.

5D, the grouting material G injected through the injection pipe 300 is introduced into the perforation hole H2 of the support layer G2, the inside of the lower steel pipe 130, the upper steel pipe 120, The injection is performed in a space between the upper steel pipe body 120 and the upper inserted steel pipe 400 (which may be an injection pipe not shown in the drawing). It can be seen that the grouting material G injected into the grouting material G is hardened and the construction of the composite file 100 of the present invention is being performed.

Next, as shown in FIG. 5E, the steel pipe head reinforcement plate 123 is installed on the upper surfaces of the upper and lower steel pipes 400 and 121, and the micro pile 110 is set so as to extend upward.

As shown in FIG. 5E, after the foundation steel is laid so that the head of the micro pile 110 is embedded, the foundation 200 is installed by installing the foundation concrete.

3A and 3B may be further provided on the microfiber head portion. The head reinforcement means 300 may be formed by, for example, passing through the steel tube head reinforcement plate 123 and extending the head upward A vertical reinforcing bar 310 is disposed between the upper pressure plate 143 and the steel pipe head reinforcing plate 123 in the microfiber 110. The upper end of the vertical reinforcing bar 310 is connected to the upper pressure plate 143 The upper end of the upper end pressure plate 143 is fastened with a fixing nut and the lower end of the lower end passes through the steel pipe head reinforcement plate 123 and is fastened to the bottom of the steel pipe head reinforcement plate 123 with a fixing nut .

[Method of constructing the composite file according to the third embodiment]

First, in the composite file construction method according to the third embodiment,

6A, a perforation hole H1 is formed so that an inner steel pipe 122 integrated with a microfill 110 to be described later can be inserted, and a perforation hole H2 is formed by using a drill bit or the like up to the support layer G2 Respectively.

Next, as shown in FIG. 6B, the lower steel pipe body 130 is inserted into the perforation hole H1, and the upper steel pipe body 120 and the lower steel pipe body 130 are connected to each other . As described above, the pipe connecting device 160 is used.

It can be seen that the upper steel pipe body 120 and the lower steel pipe body 130 are integrated and the upper steel pipe body 120 is formed into a double pipe structure by the steel pipe connector 150 and the inner pipe 122.

Next, as shown in FIG. 6C, the microfiber 110 integrated with the inner steel pipe 122 is inserted into the upper steel pipe 120 to allow the tip of the microfilm 110 to extend to the perforation hole H2, The injection tube 300 is also extended into the perforation hole H2.

6D, the grouting material G injected through the injection tube 300 is introduced into the perforation hole H2 of the support layer G2, the inside of the lower steel pipe body 130, the inside of the upper steel pipe body 120 The injection is performed in a space between the steel pipe 122 and the inner steel pipe 122 and the outer steel pipe 121 by using an injection pipe not shown in the drawing.

It can be seen that the grouting material G injected into the grouting material G is hardened and the construction of the composite file 100 of the present invention is being performed.

Next, as shown in FIG. 6E, a steel pipe head reinforcement plate 123 is installed on the upper surface of the outer steel pipe 121 and the inner steel pipe 122, that is, the upper surface of the upper steel pipe 120, .

As shown in FIG. 6E, after the foundation reinforcement is laid so that the head of the micro pile 110 is embedded, the foundation 200 is constructed by installing the foundation concrete.

3A and 3B. The head reinforcement means 300 may be formed by, for example, passing through a steel tube head reinforcement plate 123, A vertical reinforcing bar 310 is disposed between the upper pressure plate 143 and the steel pipe head reinforcing plate 123 in the microfiber 110. The upper end of the vertical reinforcing bar 310 is connected to the upper pressure plate 143, The upper end of the upper end pressure plate 143 is fastened with a fixing nut, and the lower end of the lower end passes through the steel pipe head reinforcement plate 123 and is fastened to the bottom surface of the steel pipe head reinforcement plate 123 with a fixing nut.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Compound file 110: Micro file
120: upper steel pipe body 130: lower steel pipe body
140: head fixing device 150:
160: pipe connection device 200: foundation
300: head reinforcing means 400: upper inserted steel pipe

Claims

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(a) inserting a steel pipe 131 as a lower steel pipe body 130 by first forming a perforation hole in the soil layer G1;
(b) The inner steel pipe 122 is connected to the head of the steel pipe 131 exposed to the upper surface of the earth surface so as to extend to the toe layer G1, and the outer steel pipe 121 is wrapped around the inner steel pipe 122, The upper steel pipe 120 and the lower steel pipe 130 are integrated by integrating the outer steel pipe 121 and the inner steel pipe 122 by using the closing port 124. The upper steel pipe 120 has a double pipe shape ;
(c) A drill bit is inserted into the inner steel pipe 122 and the lower steel pipe 131 to penetrate the support layer G2 and the integrated lower steel pipe body 130 is inserted into the perforation hole formed in the support layer G2 ;
(d) inserting the micro pile 110 into the upper steel pipe and the lower steel pipe so as to extend to the punch hole H2, and installing the injection pipe 300 to the punch hole of the support layer G2;
(e) The grouting material G injected through the injection pipe 300 flows through the perforation hole H2 of the support layer G2, the inside of the lower steel pipe body 130, the inner steel pipe 122 of the upper steel pipe body 120, So as to be injected into a space between the inner steel pipe (122) and the outer steel pipe (121); And
(f) installing a steel pipe head reinforcement plate 123 on the upper surface of the outer steel pipe 121 and the inner steel pipe 122, that is, on the upper surface of the upper steel pipe 120 so that the micro pile 110 is extended upward Wherein the base (200) is constructed by placing a foundation reinforcing bar so that a head of the microfilm (110) is embedded and then a foundation concrete is laid.

(a) connecting a steel pipe (131) as an upper steel pipe body (130) and an outer steel pipe (121) as an upper steel pipe body (120);
(b) A drill bit is inserted into the lower steel pipe body 130 and the upper steel pipe body 120 integrated with each other to penetrate the support layer G2 to reach the upper surface of the support layer G2 while forming the perforation hole H2 ;
(c) The upper inserted steel pipe 400 is further inserted into the outer steel pipe 121 to extend to the toe layer G1 for reinforcement of the ground surface area, Installing the injection tube (300) so as to extend to the perforation hole of the support layer (G2) while inserting the injection tube (110);
(d) The grouting material G injected through the injection pipe 300 penetrates the perforation hole H2 of the support layer G2 and the inside of the lower steel pipe body 130, the upper steel pipe body 120 and the upper steel pipe body 120 ) And the upper inserted steel pipe (400); And
(e) installing a steel pipe head reinforcement plate 123 on the upper surfaces of the upper and lower outer steel pipes 400 and 121 so that the micro pile 110 is extended upward; And the foundation 200 is installed by placing the foundation concrete after the foundation reinforcement is laid.

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