KR101834948B1 - Steel pipe micro-pile foundation system and construction method of micropile foundation using the same - Google Patents

Abstract

The present invention relates to a micro pile foundation system capable of transferring a load of a structure transferred through an iron core to a ground at a lower solid through an injection material by drilling a weak ground, installing an iron core in the inside thereof, The present invention relates to a microfiber foundation construction method. According to the present invention, there is provided an image forming apparatus comprising: a hollow fixing unit installed in a ground immediately after a piercing of a ground to transmit a load transmitted from an upper portion to a surrounding ground, or simultaneously with a piercing and having an outer diameter smaller than a piercing diameter; A microfilter including a loading section; A puncturing bit unit configured to puncture at least the outer diameter of the microfilm, pull the microfilm, reduce the end of the puncture, and recover the microfilm through an inner diameter of the microfilm; An injection material filling the space between the perforated air wall and the fusing unit to integrate the fusing unit and the surrounding ground; And a base portion of a reinforced concrete material formed so as to be embedded in the load portion, wherein the micro pile is composed of a plurality of steel pipes of a predetermined length, and the fusing portion includes a connecting structure for surrounding and fixing the outside of the adjacent steel pipe And a load of the upper building is transferred to and supported by a solid ground around the fixing unit through a load part integrated with the foundation part.

Description

TECHNICAL FIELD The present invention relates to a steel pipe micro-pile foundation system and a steel pipe micro-pile foundation system,

The present invention relates to a basic system of a small-diameter steel pipe called a micro-pile and a basic construction method using the same. More particularly, the present invention relates to a basic system of a small-diameter steel pipe called a micro- To a microfiber foundation system and a microfiber foundation construction method capable of transferring a load of a structure transferred through a steel bar to a ground of a lower solid through an injection material.

This study is the result of research conducted by the Ministry of Land, Transport and Maritime Affairs and the Agency for Technology Development of Korea (Ministry of Land, Transport and Maritime Science and Technology) (project number: 16TBIP-C111107-01-000000, title: File method development).

The present invention is directed to a small diameter base, commonly referred to as a microfile. A structure in which a weak ground is punctured and a steel rod is installed therein and an injection material such as mortar is injected and the load of the structure transmitted through the steel rods is transmitted to the ground under the solid material through the injection material.

For such conventional microfiles, the construction process is described in Korean Patent No. 10-0666678 and No. 10-0956879.

No. 10-0666678 'A micro pile having a leading end round plate' is a technique for increasing a leading end holding force by adding a leading end round plate to a conventional micro pile, and No. 10-0956879 'Stress distribution type micro pile' Is a technology that maximizes frictional force by introducing a stress dispersion flange into a micro-file.

According to the above two prior art techniques, a conventional micro-pile inserts a steel rod through a weak stratum to a solid support layer, the steel rod being designated as a "sicteba" or "tread bar", and injecting the injection material specified as a "grouting solution" In order to secure the steel rod insertion space in the fragile stratum, the 'casing' is preformed before penetrating the inside of the casing to the hard support layer. That is, in order to secure a space for installing the steel rods, the 'casing' is hammered into the soft ground, penetrating the inside of the casing, and drilling the rigid supporting layer by a certain length. Since the building load is transmitted to the solid supporting layer through the steel rods, the casing used to prevent the collapse of the pneumatic wall of the ground during the construction is left in the ground without any function after completion of the construction.

(Document 1) Korean Patent No. 10-0666678 (published on January 19, 2007) (Document 2) Korean Patent No. 10-0956879 (issued on May 11, 2010)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to replace a conventional micro pile used for preventing collapse of a pore wall during construction, , And a hollow structural member was introduced to carry out the function of maintaining the pore wall of the soft ground together with the transmission of the load. Therefore, it is an object of the present invention to provide a microfibre foundation system and a microfibre foundation construction method that can reduce the amount of steel material to be used because no casing having no function is used after completion of construction.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to an aspect of the present invention, there is provided a foundation system for supporting a load of a structure through a soft upper layer ground and transmitting the load of the structure to a rigid lower layer foundation, A microfibre which is installed in the ground immediately after the perforation of the ground so as to be transmitted to the surrounding ground, and has a hollow type fixing part having an outer diameter smaller than the perforation diameter, and a loading part formed on the upper side of the fixing part; A puncturing bit unit configured to puncture at least the outer diameter of the microfilm, pull the microfilm, reduce the end of the puncture, and recover the microfilm through an inner diameter of the microfilm; An injection material filling the space between the perforated air wall and the fusing unit to integrate the fusing unit and the surrounding ground; And a base portion of a reinforced concrete material formed so as to be embedded in the load portion, wherein the micro pile is composed of a plurality of steel pipes of a predetermined length, and the fusing portion includes a connecting structure for surrounding and fixing the outside of the adjacent steel pipe And a load of the upper building is transferred to and supported by a solid ground around the fixing unit through a load part integrated with the foundation part.

In one aspect of the present invention, the connecting structure is characterized by being formed in a ring shape or a C-shaped ring shape.

According to one aspect of the present invention, there is provided a micro pile comprising a tip shoe integrally formed with an inner diameter of a distal end of the fusing unit, the perforation bit unit including a ring bit perforating a diameter larger than an outer diameter of the fusing unit, And a core bit which is formed by a hole having a larger outer diameter than that of the inner diameter of the shoe so as to puncture while pulling the tip shoe at the same time as being pierced, .

According to one aspect of the present invention, there is provided a micro pile comprising an end shoe integrally formed with an inner diameter of a distal end of the fusing unit, wherein the perforation bit unit has a hook having an outer diameter larger than an inner diameter of the tip shoe And a wing bit extending from the end of the bit housing so as to be rotatable about a hinge pin and having a diameter larger than an outer diameter of the fusing unit and perforating the wing bit, And when the bit housing is retracted, the wing bit rotates around the hinge pin and enters the tip shoe so as to be recovered.

According to an aspect of the present invention, a plurality of resistance protrusions are formed on an outer circumferential surface of the fusing unit.

In one aspect of the present invention, the resistance protrusion is formed of the connection structure formed of the weld bead to be welded to connect the neighboring steel pipe.

In one aspect of the present invention, the resistance protrusion is formed by welding a ring-shaped, C-shaped or spiral-shaped member.

In one aspect of the present invention, the loading section includes a plurality of brackets joined to the outside of the upper end of the fixing section, and at least one loading plate provided on the bracket and projecting outward from the outer diameter of the fixing section, And an opening is formed so as not to be hermetically sealed.

According to one aspect of the present invention, the loading section is characterized by at least one ring-shaped or C-shaped protruding member joined to the outside of the upper end of the fixing section.

According to an aspect of the present invention, there is provided a packer for inserting an injection pipe for transferring the injection material into the inside of the microfiber and provided inside the fusing unit to prevent the injection material from moving upward, Wherein the fusing unit is provided with at least one logic turn valve which allows the injection material to move from the inside to the outside and blocks the movement of the injection material from outside to inside.

In one aspect of the present invention, the logic turn valve includes a valve guide which is inserted and mounted in a mounting hole formed in the fixing unit, and one end is located at one end of the valve guide and the other end is located at the other end Wherein the valve guide comprises a cylindrical body and an extended flange extending outwardly from one end of the cylindrical body, the one-way valve member having a post portion passing through the cylindrical body, A first plate portion integrally formed at one end of the post portion and having one or more flow passages through which the injecting material flows to surround the inner open end of the cylindrical body and a second plate portion integrally formed at the other end portion of the post portion, A second flange formed of a soft material and formed to cover the outer open end of the cylindrical body, Characterized by including root portion.

According to one aspect of the present invention, the outer diameter of the post portion is formed to be smaller than the inner diameter of the cylindrical body, the outer diameter of the first plate portion is formed to be larger than the outer diameter of the cylindrical body, And is equal to or smaller than the outer diameter of the extending flange.

In one aspect of the present invention, the apparatus further comprises at least one vertical iron core installed through the fusing unit before the injection material is injected and cured.

According to another aspect of the present invention, there is provided a microfiber foundation for supporting a soft pile foundation through which a load of a structure is transmitted through a soft upper pile foundation to a lower foundation pile to support a soft pile foundation, step; A second step of installing a hollow steel pipe having an outer diameter smaller than the perforation diameter in the perforated ground; A third step of installing a ring-shaped or C-shaped reinforcing structure on the upper outer surface of the installed steel pipe and inserting a lower end of a new steel pipe into the upper end of the reinforcing structure provided; A fourth step of joining the bottom of the steel pipe to the top of the steel pipe, the bottom of which is constituted by a plurality of brackets and at least one load plate or is formed in a ring shape or a C shape; A fifth step of blowing air into the lower end of the steel pipe to discharge the dust in the outer space of the steel pipe, which is a space between the outer surface of the steel pipe and the air pocket of the ground, to the outside; A sixth step of injecting an injection material into the inside of the steel pipe and the space outside the steel pipe; And a seventh step of forming a base of a reinforced concrete material so that the load part is embedded in the foundation.

According to another aspect of the present invention, after the injection material is injected in the sixth step, at least one vertical iron core penetrating the steel pipe is further installed before the injection material is cured.

According to another aspect of the present invention, the perforation includes a ring bit perforating a diameter larger than the outer diameter of the steel pipe, and an end shoe coupled to the tip of the fusing unit at the same time as the perforation is pulled by an engagement jaw having an outer diameter larger than the inner diameter of the tip shoe The first step, the second step, and the third step are simultaneously performed by using the core bit which is separated from the ring bit and enters the tip shoe so that the core bit can be recovered.

In another aspect of the present invention, the perforation may be formed by a wing bit that is pierced by a larger diameter than the outer diameter of the steel pipe, and the outer diameter of the end shoe coupled to the tip of the steel pipe, The first step, the second step, and the third step are simultaneously performed by using the recoverable bit that the wing bit rotates about the hinge pin and enters the tip shoe when the bit housing is retracted .

In another aspect of the present invention, the tip shoe is characterized in that the tip shoe is made of an end shoe integrally formed with the inner diameter of the tip end of the steel pipe with respect to the axis.

According to another aspect of the present invention, in the sixth step, the injection pipe is inserted into the steel pipe, a packer is installed inside the steel pipe to prevent the injection material from moving upward, and the injection material is pressurized, Is characterized in that the injection material is filled in the outer space of the steel pipe through one or more of the logic turn valves which are provided at the inside of the steel pipe to allow the injection material to move from the inside to the outside and block the movement from outside to inside.

According to another aspect of the present invention, in the second step, in order to increase the adhesion of the outer surface of the steel pipe and the injection material, the fusing unit having an annular, C-shaped or spiral- .

According to another aspect of the present invention, in the case where the load-carrying portion of the fourth step has a ring shape or a C-shape on the outer peripheral surface of the upper end of the steel pipe, the outer diameter thereof is equal to or larger than the diameter of the pore in the first step.

The microfibre foundation system and the microfiber foundation construction method according to the present invention can be applied to a conventional microfiber without using a steel rod serving as a structural member in a conventional microfiber and by using a hollow structural member, It is possible to reduce the amount of steel to be used. It is possible to save about 30% of steel in a conventional stratum structure in the domestic market, thereby contributing to securing economical efficiency.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a microfiber according to the present invention, showing a steel pipe including a load part. FIG.
Figure 2 is a schematic representation of a microfilter based system of the present invention.
3 is a cross-sectional view showing a connecting portion of a steel pipe adjacent to the microfiber according to the present invention.
4 is a view showing an example of resistance protrusions formed on the micro pile of the present invention.
FIG. 5 is a view showing a form in which a bracket constituting a loading section is coupled to a transfer section of a microfiber according to the present invention.
6A is a view showing an example of a load plate constituting a loading section of a micro pile according to the present invention.
Fig. 6B is a view showing another example of a loading plate constituting the loading section of the micro pile of the present invention. Fig.
7 is a diagram showing an embodiment of puncturing using a ring bit and a core bit in the micro file of the present invention.
8 is a view showing an embodiment of puncturing using a recoverable bit in the micro file of the present invention.
9A to 9C are views showing a logic turn valve member constituted in the microfiber of the present invention.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. ≪ / RTI >

In the following description with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

First, a microfilter basic system according to the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a view showing a microfiber according to the present invention, which is a view showing a steel pipe including a load part, Fig. 2 is a view schematically showing the microfilter basic system of the present invention, Fig. 2 is a cross-sectional view showing a connecting portion of a steel pipe. FIG. 4 is a view showing an example of a resistance protrusion formed on a microfiber according to the present invention, FIG. 5 is a view showing a bracket constituting a loading portion coupled to a transfer portion of a microfiber according to the present invention, Fig. 6B is a view showing another example of a load plate constituting a loading section of the micro pile according to the present invention; Fig. FIG. 7 is a view showing an embodiment of puncturing using a ring bit and a core bit in the micro file of the present invention, FIG. 8 is a view showing an embodiment of puncturing using a recoverable bit in the micro file of the present invention, and FIGS. 9 9C is a view showing a logic turn valve member constituted in the microfiber of the present invention.

The microfibre basis system according to the present invention is characterized in that as shown in Figure 1, it penetrates through the soft upper layer 10 and is drilled to a solid lower layer 20, with the main components being installed, Sectional view of a completed basic system with a base portion 70 of a reinforced concrete material filled with a reinforced concrete material 82. As shown in FIG.

The microfill foundation system of the present invention includes a microfill to which a plurality of steel pipes are connected. The microfill is intended to penetrate the soft upper layer 10 to transmit the load of the structure to the lower layer 20, A hollow fixing unit 50 installed in the lower layer ground 20 immediately after the perforation or perforation of the ground and having an outer diameter smaller than the diameter of the perforation for transmitting the load transferred from the upper portion to the surrounding ground, And a plurality of brackets 33 attached to the upper portion of the bracket and at least one load plate 31 protruding outward from the outer diameter of the fixing member. (30).

Here, as shown in FIG. 3, the fusing unit further includes a connection structure 40 which surrounds and fixes the outside of the neighboring steel pipe to connect and fix neighboring steel pipes. The connection structure 40 may be formed in a ring shape or a C shape in which one side is cut out in a ring shape.

In addition, the microfibre basis system fills the space inside the perforated walls 11 and 21 to fill the injection material 82 that integrates the fusing unit and the surrounding ground, and the reinforcing bar 30, And a base portion 70 made of a concrete material.

In addition, the present invention is characterized in that the dust that falls from the outer side spaces (41, 51) of the steel pipe is joined to the outer periphery of the upper end of the fixing portion (50) so as to protrude from the outer side of the steel pipe (Not shown) for preventing the air from being introduced into the spaces 41 and 51. The air can be passed through the air blown upward by the air blown from the lower end of the fixing unit At least one flow path portion may be provided.

In the present invention, the load of the upper building is transmitted to the lower portion (30) through the base portion (70) of concrete, and the load under the lower portion is transmitted to the fixing portion (50). The fixing part 50 is embedded in the rigid lower layer ground 20 and the outer spaces 41 and 51 of the steel pipe which are formed to be larger than the outer diameter of the fixing part are filled with the injection material 82. Therefore, And is transmitted to and supported by the lower ground 20.

Immediately after the piercing of the ground, the fixing unit 50 can be inserted while connecting a plurality of steel pipes into pieces through the connecting structure 40. Alternatively, the piercing bit may be moved forward while pulling the fixing unit 50, It is also possible to perform drilling while sequentially connecting the steel pipes.

The method of sequentially inserting and inserting one piece immediately after the end of the punching or the punching can be selectively applied according to the state of the upper layer ground 10. However, both methods require air to be ejected from the lower end of the fixing unit 50 to discharge the slime generated during the perforation in the stage where the perforation is terminated and the insertion of the fixing unit 50 is completed. The slime discharge, commonly referred to as air surging, removes dirt and stone dust from the steel pipe outer spaces 41 and 51 so that the filler material 82 is firmly secured to the bottom wall 21 of the lower layer ground 20 and the surrounding ground So that they can be integrated with each other.

Even after the slime discharging operation, a slight slime may occur in the relatively soft upper layer ground 10 and may fall into the lower outer space 51. To solve this problem, the upper layer ground 10 may be joined to the outer side of the upper portion of the fixing portion 50, And blocking means for preventing the dirt falling from the outer space (41) from flowing into the outer space (41, 51) of the steel pipe which is a space between the outer wall of the fixing part and the air wall (21) of the lower layer ground, And at least one flow path portion capable of passing the dust that is sprayed upward by the air sprayed from the lower end.

The inner spaces of the steel pipe outer spaces 41 and 51 which are the spaces inside the perforated walls 11 and 21 and the inside of the fusing unit 50 are filled with the filler material 82. In order to substantially support the load of the upper building, With the solid bottom layer 20 around the portion 50, the soft top layer 10 will support some of the load but is not large enough to be excluded from engineering calculations.

The lower part 30 is embedded in a base part 70 of a reinforced concrete material and includes a lower plate 31 having an opening 32 and a plurality of brackets 33 provided at an upper end of the fixing part 50 . Such a load is a means for preventing the upper end of the fixing unit 50 from being damaged and deteriorating in function due to the concentrated load, and the bracket 33 is welded to the outside of the upper end of the fixing unit 50 as shown in FIG. It will be easy. The loading plate 31 may be a single plate having an opening 32 as shown in FIG. 6A, and a plurality of loading plates 31 may be formed so that the opening 32 is formed at the center as shown in FIG. 5B It is possible. Although it is possible to provide the bracket 33 inside the upper end of the fixing unit 50, the convenience of the operation will not be good.

The microfibre foundation system according to the present invention has a structure in which the load of the upper building is embedded in the base portion 70 and is connected to the solid bottom portion ground 20 around the fixing portion 50 through the lower portion 30 and the fixing portion 50, To be supported.

Although the fusing unit 50 and the fusing unit 50 are illustrated as being of the same diameter for the sake of convenience, the fusing unit 50 and the fusing unit 50 are not necessarily circular unless they have different diameters. For example, an eight-sided pipe may be used, and the transfer portion may have a circular cross-section, and the fusing portion may be an eight-sided pipe.

The blocking portion is provided at the upper end of the fixing portion 50 and surrounds the fixing portion in a spiral shape. The blocking portion is joined to the outer periphery of the upper portion so as to protrude from the outer periphery of the upper portion, (41, 51), which is a space between the outer side surface and the air wall (21) of the lower layer ground, and a flow-restricting jaw. And may have at least one passage portion formed between the blocking means and capable of passing the dust that is sprayed upward by the air injected from the lower end of the fixing section. The flow-down preventing jaw is provided at one end of the blocking means so as to extend upward to enhance the blocking efficiency of the slime, and it is a function of assisting the blocking means and is not necessarily required.

One of the blocking means may be located at the upper portion of the other end of the adjacent blocking means so as to block the dust or the stone wall falling in the outer space 41 or 51 of the steel pipe. . In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging.

In addition, the blocking portion may be constituted by one helical blocking means, and one end of the blocking means is positioned at the upper portion of the other end, so that the dust and the stone block falling in the outer spaces 41 and 51 of the steel pipe can be blocked. In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging.

In addition, the blocking portion may be composed of a plurality of helical blocking means. One blocking means may be located at the other upper end of the adjacent blocking means to block the dust and the stone wall falling in the outer tubular spaces 41 and 51 do. In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging.

In addition, the blocking portion may be formed of a plurality of stepwise blocking means. One blocking means may be located at the other upper end of the adjacent blocking means to block the dust or the stone wall falling in the outer spaces 41 and 51 of the steel pipe . In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging. Here, it is also possible to form the blocking portion with one stepwise blocking means such that one end thereof is positioned at the upper portion of the other end thereof.

In addition, the blocking portion may be constituted by a plurality of L-shaped blocking means. One of the blocking means may be positioned at the upper portion of the other end of the adjacent blocking means to block the dust and the stone wall falling in the outer spaces 41 and 51 . In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging. Here, it is also possible to form the blocking portion with one L-shaped blocking means so that one end thereof is positioned at the upper portion of the other end. In this embodiment, it is preferable that the shape of the letter L is a shape of an obtuse angle larger than a right angle.

The shielding portion may be formed of a plurality of V-shaped shielding means, and one shielding means may be located at the upper portion of the other shielding means adjacent to the other shielding means so as to block the dust and the stone wall falling in the steel pipe outer spaces 41 and 51 . In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging.

The shielding portion may be formed by a plurality of U-shaped shielding means. One shielding means may be located at the upper portion of the other shielding means adjacent to the other shielding means so as to block the dust and the stone- . In addition, a flow path portion 763 is formed between the blocking means so that the slime can be discharged from the steel pipe outer spaces 41 and 51 to the steel pipe outer spaces 41 and 51 at the time of air surging. In the case of this embodiment, it is preferable that the upper portion of the U is slightly widened.

The shielding portion may be formed of a plurality of wavy-pattern shielding means. One shielding means may be located at the upper portion of the other shielding means adjacent to the other shielding means so as to block the dust or the stone wall falling in the steel pipe outer spaces 41 and 51 . In addition, a flow path is formed between the blocking means, so that the slime can be discharged to the outer space 41, 51 of the steel pipe at the time of air surging.

The shielding part like one of the above embodiments is provided at the upper part of the other end of the other shielding means adjacent to one of the shielding means and can block the dust falling in the outer side spaces 41 and 51 of the steel pipe, 51) can be prevented from being contaminated with dust.

In the above-described embodiments, it is preferable that the degree of protrusion of each blocking means is close to the perforated diameter, and it is possible to appropriately block the dust while inserting a large amount of friction with the inner wall of the pore diameter at the time of inserting.

The blocking portion may be provided on at least one end of the blocking means. At least one of the blocking means of the blocking portion may extend upwardly to prevent the drainage from flowing down. So that it is possible to increase the efficiency of cutting off the dusts falling into the outer spaces 41 and 51 of the steel pipe.

2, a portion of the reinforcing bar 71 of the base portion 70 is disposed below the loading plate 31 and the remaining portion is disposed above the loading plate, so that the base portion and the loading plate are firmly fixed So as to effectively transmit the load of the upper building.

1, the injection pipe 81 for transferring the injection material is inserted into the fixing unit 50, the upper part of the transfer unit is sealed with the first packer 83, and the upper part of the transfer pipe is conveyed to the second packer 84 It is preferable that the fusing unit and the rigid lower layer ground 20 can be integrated by pressurizing and injecting the injection material in a state where the outer side surface and the air wall 11 are closed.

In the present invention, the injection tube 81 for transferring the injection material is inserted into the fusing unit 50, the injection material injected from the fusing unit 50 is allowed to move from the inside to the outside, A plurality of non-return valves 400 (see Figs. 9A to 9C) configured in the fixing unit 50 to block the movement of the fixing unit 50 to the inside thereof.

9A to 9C, the logic turn valve 400 includes a valve guide 410 inserted into a mounting hole formed in a fusing unit 50 of a microfiber, and a valve guide 410, Way valve member (not shown) disposed at one end of the valve guide 410 and positioned at the other end of the valve guide 410 to allow movement of the injection material from the inside to the outside and block movement from the outside to the inside 420).

The valve guide 410 includes a cylindrical body 411 and an extended flange 412 extending outwardly from one end of the cylindrical body 411.

The one-way valve member 420 includes a post portion 421 passing through the cylindrical body 411 and one or more flow passages 422a formed integrally with one end of the post portion 421, A first plate portion 422 formed at the periphery of the cylindrical body 411 to cover one open end (an open end located inside) of the cylindrical body 411 and a second plate portion 422 integrally formed at the other end of the post portion 421 And a second plate portion 423 provided to cover the other open end of the cylindrical body 411 (the open end located on the outer side).

The outer diameter of the first plate portion 422 is formed to be larger than the outer diameter of the cylindrical body 422. The outer diameter of the post portion 421 is smaller than the inner diameter of the cylindrical body 411 in the one- And the outer diameter of the second plate portion 423 is larger than the outer diameter of the cylindrical body 422 and is equal to or smaller than the outer diameter of the extending flange 412.

9C, the injection material injected into the fixing part 50 passes through the flow path 422a of the first plate part 322 and flows into the cylindrical body 411 The second plate portion 423 made of a soft material is pushed between the post portions 421 and moved to the outside of the fixing portion 50 while pushing both edges of the second plate portion 423.

Next, the microfiber foundation construction method of the present invention will be described step by step.

The microfiber foundation construction method of the present invention is characterized in that a weak upper layer ground 10 and a rigid lower layer ground 20 are formed in a predetermined shape so that a microfibre foundation supporting a microfibre foundation supporting a microfiber foundation through a soft upper- A first step of drilling at a diameter of the first step; A second step of installing a hollow steel pipe having an outer diameter smaller than the perforation diameter in the perforated ground; A third step of providing a ring-shaped or C-shaped reinforcing structure 40 on the upper outer surface of the installed steel pipe and inserting a lower end of a new steel pipe into the upper end of the reinforcing structure provided; A fourth step of joining a lower portion (30) made of a ring or C shape to the upper end of the upper steel pipe, which is composed of a plurality of brackets (33) and at least one load plate (31); A fifth step of blowing air to the lower end side of the steel pipe to discharge the dust of the outer side space (41, 51), which is a space between the outer side surface of the steel pipe and the air pocket of the ground, to the outside; A sixth step of injecting an injection material into the inside of the steel pipe and the outer space of the steel pipe (41, 51); And a seventh step of forming a base portion (70) of a reinforced concrete material so that the lower portion (30) is embedded in the lower portion (30) To the rigid lower layer ground 20 around the fusing unit 50 and supports it.

The first step is a step of drilling the ground, the second step is a step of inserting the fixing part 50 into the perforated ground, and the third step is a step of installing a reinforcing structure as a connecting structure to a neighboring steel pipe. The execution of these three steps can be divided into two types according to the combination.

The first type is generally referred to as 'post-perforation insertion'. When the perforated wall is not completely collapsed when perforating the soft upper layer 10, it can be applied only if it can be self-supported to a certain extent. The fixing unit 50 may be integrally connected and inserted, or may be inserted while sequentially connecting the fixing units divided into a plurality of pieces. That is, the first step is performed first and then the second step and the third step are performed at a time, or the first step is performed first, and then the second step and the third step are sequentially performed several times.

The completion of the first step and the second and third steps is to fill the fusing part 50 within the pore size after the end of the piercing so that even if the soft upper pile ground 10 is pierced, The present invention can be applied to a case where it can be maintained for a period of time longer than the degree of installation by inserting the inserter 50.

The second embodiment is applied to a case in which the pierced hole is not fully maintained in the state where the soft upper layer ground 10 is pierced after the piercing equipment has been recovered and it is difficult to insert the fusing unit 50. In the second step, Step fixing unit must be installed. In this case, the perforation bit is pierced and the fixing unit is pulled. After the perforation of a certain length, the process of puncturing is repeated while connecting the fixing unit divided into a plurality of pieces. This form is made possible by the following two embodiments using core bit 85 and ring bit 86 or using recoverable bit 90.

7, the perforation includes a ring bit 86 pierced by a diameter larger than the outer diameter of the fusing unit 50 and a stopping jaw 87 having an outer diameter larger than the inner diameter of the tip shoe 52, The core bit 85 is pulled while pulling the tip end shoe 52 of the fixing unit at the same time as the perforation is made, Steps can be performed simultaneously. The ring bit 86 is used for drilling the steel pipe and is detachably coupled to the core bit 85 to be drilled to a diameter equal to or greater than the outer diameter of the fusing unit 50, The front end shoe 52 coupled to the front end of the fixing unit 50 is pulled. The first step and the second step are performed first, and the first and third steps are performed successively, as will be apparent from the composition of the present invention. In this process, it is preferable that a fixing rod 50 formed through a steel pipe divided into a plurality of pieces is formed while extending a rod that transmits power to the core bit 85 after a predetermined length is drilled, Is repeatedly performed until a predetermined depth is reached. The ring bit and the core bit are separated by rotation in the opposite direction to that of the perforation, leaving the ring bit and leaving the core bit 85 as represented by the dashed line in FIG. 7 ). This process is performed by connecting the steel pipes divided into plural pieces together with the progress of the perforation, so that after the end of the perforation, the fixing unit is installed in the ground.

8, the perforation is pierced by a wing bit 91 having a larger diameter than the outer diameter of the fusing unit 50, and the outer diameter of the outer shoe 52 is larger than the inner diameter of the tip shoe 52 When the bit shoe 95 is pulled back at the same time when the bit shoe 95 is pierced and the bit shoe 99 is retracted, the wing bit 91 is rotated about the hinge pin 92 and is guided into the tip shoe It is possible to cause the first step, the second step and the third step to be performed at the same time by using the recoverable bit 90 that comes in and is recoverable.

The two bits 90 are rotated about the hinge pin 92 so that two wing bits 91 penetrate the outer periphery of the fusing unit 50 and the two wing bits rotate about the hinge pin 92, It can go inside the inside diameter and it can be recovered by simple retraction operation. The hinge pin 92 is connected to the bit housing 99 by the connecting means 93. It is preferable to use a resilient spring as a connecting means so as to allow a slight displacement but not to deviate completely. The bit housing 99 is provided with a hooking jaw 95 having an outer diameter larger than the inner diameter of the tip shoe 52 to puncture while pulling the tip shoe coupled to the tip of the fixing unit 50. The first step and the second step are performed first, and the first and third steps are performed successively, as will be apparent from the composition of the present invention.

In the present invention, the tip shoe 52 is shown to have a separate configuration, but it is preferable that the tip shoe 52 be integrally formed with the tip of the fusing unit 50 through a predetermined process Do. In other words, the tip shoe 52 may be configured so that the inner diameter of the tip end of the fixing unit 50 is made to be a tip end shoe with respect to the shaft through steel pipe swaging. In the present invention, the present invention is applied to reduce the inner diameter of the end portion of the fusing unit through a swaging technique for processing an end of a pipe, thereby improving the efficiency of processing.

The above process is preferably performed by connecting a steel pipe divided into a plurality of pieces while extending a rod that transmits power to the recoverable bit 90 after a certain length of drilling. Is repeatedly performed until a predetermined depth is reached. After completion of the perforation, the fusing unit is set in the ground. After the end of the drilling operation, air surging is performed, and the bit housing 99 is retracted as shown by the dotted line in FIG. 8 to be recovered.

In the case of a microfile using an existing casing, since a plurality of microfiles are usually drilled and the steel rods are inserted and air holes are maintained for a substantial period of time until the injection material is injected into a plurality of holes, And the inside thereof was punctured to prevent the air wall from collapsing. However, in the case of the present invention, since the fusing unit 50 is in the form of a hollow steel pipe, the fusing unit 50 is inserted into the fusing hole immediately after the perforation to serve as a casing for blocking the depression of the soft upper layer ground 10 outside the fusing unit.

That is, it is possible to apply the method of 'post-perforation insertion' because the time required for the pneumatic wall 11 of the soft upper layer ground 10 to become self-sustaining and not collapse after puncturing is short within minutes. Injection material injection should be performed after the completion of a large number of drilling operations, and the equipment such as an agitator and an injection pump should be operated. After the injection material is injected, the site is rearranged and the cement- A casing for holding the air wall 11 is necessarily required. In order to solve this problem, the present invention introduces a hollow fixing unit 50, which functions as a casing and functions as a structural member.

The fourth step is a step of bonding the lower part 30 to prevent deformation or breakage of the upper end of the fixing part 50 and complementing the load transfer function. The application time is a step before the seventh step of installing the base part 70 If there is no problem in the process, it can be adapted to the situation. Generally, such joining is preferably performed by welding between steel members.

The fifth step is a step of blowing air until the dust does not protrude to the surface of the ground, which is usually called air surging, to clean the perforated space. After the second step of installing the fusing unit 50 in the ground, It must be done before the sixth step of injecting the injection material 82. That is, after the fusing unit 50 is installed, air is introduced into the outer spaces 41 and 51 of the steel pipe between the air holes 21 of the rigid lower layer ground 20 into which the injection material 82 is to be injected and the outer diameter of the fusing unit 50 Cleaning is done to prevent slime from existing.

The sixth step is a step of injecting the injection material 82. It is preferable that the injection tube 81 is injected into the inside of the inner diameter of the fixing unit 50. [ The injection material is also called a grout liquid, and it is usually preferable to use cement mortar or mortar.

Here, the present invention further includes adding one or more vertical iron cores penetrating the fusing unit after the injection material 82 has been injected in the sixth step before the injection material 82 is cured, It is desirable to increase the load resistance capability.

Next, in the seventh step, it is preferable that the injection material 82 injected in the sixth step progresses in a hardened state to some extent. In order to firmly connect the lower part 30 with the base part 70, It is preferable to constitute the base portion to be embedded.

Here, the present invention further includes a plurality of annular, C-shaped, or spiral-shaped adhesive force increasing structures on the outer side of the fusing unit 50 of the microfiber to further enhance the adhesive force between the outer wall of the fixing unit 50 and the injection material .

The microfile foundation can be effectively fabricated through these seven steps, and it is possible to determine the successive relationship of each step or the repetition of each step according to the intention of the designer or the field conditions.

In the sixth step, a first packer 83 for inserting the injection tube 81 into the transfer part 40 and blocking the inside of the fusing part 50 is provided to pressurize the fusing part 50 and the rigid lower layer ground 20 can be more firmly integrated. In addition, a second packer (84) for selectively blocking the outer side of the upper part of the transmission part and the air wall is provided to prevent the inflow material from flowing on the ground surface and thus contamination of the site.

The packer is an element for blocking the opening of the hole. It can be selected from a variety of products that can be used to block the hole by inflating the air or applying a large amount of rubber or urethane material.

In the above process, the step of providing the blocking means at the upper end of the fixing unit is not included. However, since it is included in the main constitution of the micro pile basic system of the present invention, I will. In the case of the steel material constituting the fusing part, the transfer part, and the load part, the work is carried out through a work such as cutting, chamfering, etc. at the factory instead of the field. In such a factory, it is preferable to connect the cutting means to the upper end of the fusing part to reduce field work Do.

Through the above process, it is possible to manufacture a micro pile foundation system which penetrates the soft upper layer ground and transfers the load of the upper building to the solid ground floor.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: upper layer ground 11, 21:
20: lower layer ground 30: lower layer
31: load plate 32: opening
33: bracket 40: connection structure (reinforcing structure)
50: fusing unit 52: tip shoe
70: foundation 71: reinforcing steel
72: Concrete 81: Injection pipe
82: injection material 83: first packer
84: Second packer 85: Core bit
86: Ring bit 87:
90: Recall type bit 91: Wing bit
92: hinge pin 93: connecting means
94: fixing pin 95: engaging jaw
99: bit housing

Claims (21)

A foundation system for supporting and supporting a load of a structure through a soft upper layer ground to a harder lower layer ground,
A hollow fixing unit installed in the ground immediately after the ground penetration or at the same time as the perforation to transmit the load from the upper portion to the surrounding ground and having an outer diameter smaller than the perforation diameter, file;
A puncturing bit unit configured to puncture at least the outer diameter of the microfilm, pull the microfilm, reduce the end of the puncture, and recover the microfilm through an inner diameter of the microfilm;
An injection material filling the space between the perforated air wall and the fusing unit to integrate the fusing unit and the surrounding ground; And
And a base portion of a reinforced concrete material formed to be embedded in the load portion,
The micro pile is made of a plurality of steel tubes having a predetermined length,
Wherein the fixing unit further includes a connection structure for surrounding and fixing the outer side of the neighboring steel pipe,
And a packing for inserting the injection material into the micro pile and blocking the movement of the injection material to the upper side of the micro pile, the injection material being pressurized and injected into the micro pile, There is provided at least one logic turn valve that allows movement from the inside to the outside and blocks from moving from the outside to the inside,
Wherein the logic turn valve includes a valve guide which is inserted into a mounting hole formed in the fixing unit and a flexible one-way valve member which is located at one end of the valve guide and at the other end of the valve guide, Lt; / RTI >
Wherein the valve guide comprises a cylindrical body and an extending flange extending outwardly from one end of the cylindrical body,
Wherein the one-way valve member includes a post portion passing through the cylindrical body, and one or more flow passages formed integrally with one end of the post portion through which the injection material flows, to cover the inner open end of the cylindrical body And a second plate part made of a soft material integrally formed at the other end of the post part and covering the outer open end of the cylindrical body,
Wherein the load of the upper building is transferred to and supported on a solid ground around the fixing unit through a load part integrated with the foundation part.
The method according to claim 1,
Wherein the connection structure is formed in an annular or C-shaped ring shape.
The method according to claim 1,
Wherein the micro-pile comprises an end shoe integrally formed with an inner diameter of a distal end of the fusing unit,
Wherein the puncturing bit unit includes a ring bit formed in a diameter larger than an outer diameter of the fusing unit, and a hook having an outer diameter larger than an inner diameter of the tip shoe. The puncturing unit punctures while pulling the tip shoe, And a core bit which is separated from the core shoe so as to be inserted into the tip shoe and is recoverable.
The method according to claim 1,
Wherein the micro-pile comprises an end shoe integrally formed with an inner diameter of a distal end of the fusing unit,
Wherein the perforation bit unit comprises a bit housing having an engaging protrusion having an outer diameter larger than an inner diameter of the tip shoe formed on an outer surface of the bit housing and having a hinge pin rotatable about an end of the bit housing, Wherein the wing bit is pivoted by the diameter and simultaneously pulls the tip shoe by the hooking jaw at the same time as the puncture is made. When the bit housing is retracted, the wing bit rotates about the hinge pin and enters the tip shoe So that it can be recovered.
The method according to claim 1,
And a plurality of resistance protrusions are formed on an outer circumferential surface of the fusing unit.
6. The method of claim 5,
Wherein the resistance protrusions are formed of the connection structure including weld beads welded to connect neighboring steel pipes.
6. The method of claim 5,
Wherein the resistance protrusion is formed by welding a ring-shaped, C-shaped or spiral-shaped member.
The method according to claim 1,
The loading unit is composed of a plurality of brackets joined to the outer side of the upper end of the fixing unit and at least one loading plate provided on the bracket and protruding outward from the outer diameter of the fixing unit and an opening is formed so that the upper end of the fixing unit is not closed Wherein the microfilter base system comprises:
The method according to claim 1,
Wherein the loading section comprises at least one ring-shaped or C-shaped protruding member joined to the outside of the upper end of the fixing section.
delete delete The method according to claim 1,
Wherein an outer diameter of the post portion is formed to be smaller than an inner diameter of the cylindrical body, an outer diameter of the first plate portion is larger than an outer diameter of the cylindrical body, an outer diameter of the second plate portion is larger than an outer diameter of the cylindrical body, Wherein the microfilter base system comprises:
The method according to claim 1,
Further comprising at least one vertical iron core installed through the fusing unit before the injection material is injected and cured.
In the construction of the micro pile foundation which supports the structure through the soft upper layer ground and transfers the load of the structure to the lower layer ground,
A first step of perforating the soft upper layer ground and the solid lower layer ground to a predetermined diameter;
A second step of installing a hollow steel pipe having an outer diameter smaller than the perforation diameter in the perforated ground;
A third step of installing a ring-shaped or C-shaped reinforcing structure on the upper outer surface of the installed steel pipe and inserting a lower end of a new steel pipe into the upper end of the reinforcing structure provided;
A fourth step of joining the bottom of the steel pipe to the top of the steel pipe, the bottom of which is constituted by a plurality of brackets and at least one load plate or is formed in a ring shape or a C shape;
A fifth step of blowing air into the lower end of the steel pipe to discharge the dust in the outer space of the steel pipe, which is a space between the outer surface of the steel pipe and the air pocket of the ground, to the outside;
A sixth step of injecting an injection material into the inside of the steel pipe and the space outside the steel pipe;
And a seventh step of forming a base portion of the reinforced concrete material so that the load portion is embedded inside,
In the sixth step, the injection pipe is inserted into the steel pipe, and a packer is installed inside the steel pipe to prevent the injection material from moving upward, thereby pressing the injection material. The injection material is provided on the side wall of the steel pipe, And the filling material is filled in the outer space of the steel pipe through the at least one logic turn valve which blocks the movement from the outside to the inside,
Wherein the logic turn valve includes a valve guide inserted into a mounting hole formed in a fixing unit and a flexible one-way valve member having one end positioned at one end of the valve guide and the other end positioned at the other end of the valve guide Wherein the valve guide comprises a cylindrical body and an extending flange extending outwardly from one end of the cylindrical body, wherein the one-way valve member includes a post portion passing through the cylindrical body, A first plate portion formed at the periphery of the cylindrical body to cover an inner open end of the cylindrical body and a second plate portion integrally formed at the other end portion of the post portion, And a second plate portion made of a soft material so as to cover the end thereof The
Microfiber foundation construction method.
15. The method of claim 14,
Wherein at least one vertical iron core penetrating the steel pipe is installed before the injection material is cured after the injection material is injected in the sixth step.
15. The method of claim 14,
The perforation is made by pulling the end shoe coupled to the tip of the fusing unit simultaneously with the perforation by the ring bit being pierced by a diameter larger than the outer diameter of the steel pipe and the stopper having an outer diameter larger than the inner diameter of the tip shoe, Wherein the first step, the second step, and the third step are simultaneously performed by using a core bit which is separated and inserted into the tip shoe and is recoverable.
15. The method of claim 14,
The drill is pierced by a wing bit expanded to a diameter larger than the outer diameter of the steel pipe and is pulled by the engagement jaw having an outer diameter larger than the inner diameter of the tip shoe and at the same time the end shoe coupled to the tip of the steel pipe is pulled, The wing bit is rotated around the hinge pin to enter the tip shoe so that the first step, the second step, and the third step are simultaneously performed using the recoverable bit that can be recovered. Basic construction method.
18. The method according to claim 16 or 17,
Wherein the tip shoe comprises an end shoe integrally formed with the inner diameter of the tip end of the steel pipe with respect to the axis.
delete 17. The method of claim 16,
Wherein in order to increase the adhesive force between the outer surface of the steel pipe and the injection material in the second step, the fusing unit having an annular, C-shaped or spiral-shaped adhesion promoting structure on its outer surface is installed in the perforated ground. Way.
15. The method of claim 14,
Wherein when the load-carrying portion of the fourth step has a ring shape or a C shape on the outer peripheral surface of the upper end of the steel pipe, the outer diameter is equal to or larger than the diameter of the pore in the first step.

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