KR101829812B1

KR101829812B1 - Micropile foundation system and construction method of micropile foundation

Info

Publication number: KR101829812B1
Application number: KR1020150189265A
Authority: KR
Inventors: 정순용
Original assignee: (주)나다건설
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2018-02-20
Also published as: KR20170079083A

Abstract

The present invention is to improve a conventional micro pile which uses a steel rod as a structural member and uses a casing to maintain a pneumatic wall, through which a load of a building is passed through a soft upper layer ground to a solid lower layer ground and supported.
In the present invention, a hollow fixing unit installed in a lower ground immediately after the perforation or at the time of perforation and transmitting the load transmitted through the transmission unit to the surrounding ground, and an upper end thereof is extended to be exposed above the ground surface, A transferring part having a diameter larger than an outer diameter of the fusing part and smaller than a diameter of the piercing hole so as to prevent the pneumatic wall from being collapsed, at least one of which is connected to the upper end of the fusing part, At least one flow path portion for allowing the dust ejected upward from the space outside the fusing unit, which is a space between the outside of the fusing unit and the air wall, to flow into the inside of the transfer unit by the air injected from the lower end of the fusing unit, A plurality of brackets joined to the inside or outside of the upper end of the transmission portion, And at least one load plate which is provided at the outer periphery of the transfer part and which protrudes outwardly from the outer diameter of the transfer part. The lower part of the material forming the opening to prevent the upper end of the transfer part from being sealed, And a bottom portion of the reinforced concrete material formed so as to be embedded in the load portion, the load of the upper building is transmitted to and supported by the lower portion of the material integrated with the base portion and the solid bottom portion around the fusing portion, Based system and a microfile foundation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfile foundation system and a microfile foundation,

The present invention relates to a small-diameter foundation generally referred to as a micro-pile, in which a soft ground is drilled, a steel rod is installed therein, and an injection material commonly referred to as a grout solution is injected to secure the load of the structure transmitted through the steel rod To the lower ground.

The present invention is directed to a small diameter base, commonly referred to as a microfile. A structure in which a weak ground is drilled 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 rod 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.

Korean Patent No. 10-0666678 Korean Patent No. 10-0956879

In the present invention, a steel rod is used as a structural member that transmits load, and a casing is designed to replace a conventional micro pile used for preventing collapse of a pore wall of a soft ground during construction. And to carry out the function of keeping the weak ground in the ground. Therefore, after the completion of the construction, a casing having no function is not required, so that the amount of steel material used can be reduced.

In order to achieve the above object, the present invention provides a micro pile foundation system that penetrates a soft upper pile foundation (10) to transmit and support a load of the pile foundation to a lower pile foundation foundation (20) A hollow fixing unit 50 installed in the ground 20 for transmitting a load transmitted through the transmission unit 40 to the surrounding ground; The upper end of which is extended to be exposed above the surface of the earth and has an outer diameter larger than the outer diameter of the fusing part and smaller than the perforation diameter so as to prevent the air wall 11 from falling, (40); A joining portion (60) having one side joined to the upper end of the fixing portion (50) and the other side joined to the lower end of the transmitting portion (40); At least one of the dust particles injected upward in the fixing space outer space 51, which is a space between the outer side of the fixing unit and the air wall 21 by the air injected from the lower end of the fixing unit, A flow path portion 62; A plurality of brackets 33 joined to the inner or outer side of the upper end of the transmission part and at least one load plate 31 provided at the upper part of the bracket and protruding out of the outer diameter of the transmission part, (30) in which the lower portion (32) is formed; An injection material 82 filling the space inside the perforated air walls 11 and 21 to integrate the fusing unit and the surrounding ground; And a base portion (70) of a reinforced concrete material formed so that the ash lower portion (30) is embedded in the bottom portion of the fixing portion. The load of the upper structure is transferred to the lower bottom portion (20) to support the microfibre basic system.

In this case, the joining portion is composed of a plurality of joining means 61a whose outer side is coupled to the lower end of the transmitting portion and whose inner side is coupled to the outer upper end of the fixing portion, and a channel portion 62a is formed between the joining means desirable.

And at least one plate-like joining means (61b) joined to the upper end of the fixing unit so that the outside of the joining portion is bonded to the lower end of the transmitting portion so as not to protrude outside the inside diameter of the fixing portion, , The flow path portions 62b and 62c can be formed in the joining means 62b or between the joining means 62c.

The joining portion is composed of plate-like joining means (61c) which is joined to the lower end of the transmitting portion but does not protrude outside the diameter of the transmitting portion, and the inner side thereof is joined to the fixing portion and does not protrude to the inside of the fixing portion. The flow path portion can be formed of a through hole (63) provided so as to pass through the inside and the outside of the fusing portion.

It is preferable that a base portion is formed such that a portion of the reinforcing bars 71 of the base portion 70 is disposed below the load plate 31 and the remaining portion is disposed above the load plate so that the base portion and the load plate are firmly coupled Do.

Also, the injection pipe 81 for transferring the injection material is inserted into the transfer part 40, the upper part of the transfer part is sealed, and the injection material is pressed and injected.

The soft upper layer ground 10 and the harder lower layer ground 20 are punched into a predetermined diameter in the manufacture of a basic system that penetrates the soft upper layer ground 10 and transfers the load of the structure to the harder lower layer ground 20, ; A second step of installing a hollow fixing part (50) having an outer diameter smaller than the pore size in a perforated ground; The lower end of which is joined to the joint portion joined to the upper end of the fixing portion 50 and the upper end thereof is exposed on the surface of the earth, the outer diameter of which is larger than the outer diameter of the fixing portion, Step 3; A fourth step of joining a load part composed of a plurality of brackets and at least one load plate to the upper end of the transmission part; A fifth step of blowing air to the lower end of the fixing unit provided in the lower layer ground 20 and discharging the dust of the fixing unit outer space 51 which is a space between the outer side of the fixing unit and the air wall 21 to the outside; A sixth step of injecting an injection material (82) into the fusing unit, the transfer unit, and the fusing unit outer space (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) of the upper portion. To the rigid lower layer ground (20) and to support the microfiber foundation.

The perforation is formed by a ring bit 86 pierced by a diameter larger than the outer diameter of the fusing unit 50 and by a hooking jaw 87 having an outer diameter larger than the inner diameter of the tip shoe 52, The first step, the second step and the third step are simultaneously performed by using the core bit 85 that can be recovered because the tip shoe 52 is pulled and pulled back and separated from the ring bit to enter the tip shoe .

The perforation is perforated to a diameter larger than the outer diameter of the fusing unit 50 by the spread wing bit 91 and the fusing unit 95 is pierced by the fusing unit 95 having an outer diameter larger than the inner diameter of the tip shoe 52, When the combined end shoe is pulled and the bit housing 99 is retracted, the wing bit 91 enters the tip shoe while rotating about the hinge pin 92 and is withdrawn using the recoverable bit 90 , It is possible to perform the first step, the second step and the third step at the same time.

In the sixth step, the injection tube 81 is inserted into the transfer part 40, a packer 83 for closing the inside of the upper part of the transfer part 40 is provided, and the injection material is pressed, As shown in FIG.

The present invention can reduce the amount of steel used because it does not require a casing, which serves as a passage, by using a hollow structural member without using a steel bar serving as a structural member in a conventional microfiber. In a typical stratification structure in Korea, about 50% of steel can be saved, which can contribute to economical efficiency.

1 is a block diagram of a microfilm main constitution
Figure 2 is a cross-
Figure 3 shows a cross-
FIG. 4 is a block diagram of the microfiles
FIG. 5 is a diagram showing a punching example using a ring bit and a core bit
FIG. 6 is a flowchart illustrating a puncturing example using recoverable bits

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Figure 1 shows the main configuration of the microfill foundation system of the present invention in which the main components are installed and penetrated through the soft upper layer 10 to the harder lower layer 20, Sectional view of a completed base system with a base portion 70 of reinforced concrete material filled therein.

The micro pile foundation system of the present invention is intended to support the load of the building through the soft upper layer ground 10 and to transmit the load of the building to the lower layer ground 20 and to support the load in the lower layer ground 20 immediately after the piercing The upper end of the fixing unit 50 extends to be exposed on the ground surface and the upper load applied through the lower portion 30 is fixed to the fixing unit 50. The fixing unit 50 includes a hollow fixing unit 50 installed to transmit the load transmitted through the transmission unit 40 to the surrounding ground, (40) having an outer diameter larger than the outer diameter of the fusing part and smaller than the perforation diameter so as to prevent the air wall (11) from falling down, and one side thereof being joined to the upper end of the fusing part (50) And a bonding portion 60 including at least one bonding means 61 bonded to the lower end of the transfer portion 40. The space between the outer side of the fusing portion and the air wall 21 by the air injected from the lower end of the fusing portion At least one flow path portion 62 for allowing the dust ejected upward from the attachment space 51 to move into the interior of the transmission portion 40 and a plurality of brackets 33 And at least one lower plate 31 provided at an upper portion of the bracket and protruding outwardly from the outer diameter of the transmission portion. The lower portion 30 is formed with an opening 32 to prevent the upper end of the transmission portion from being hermetically sealed. An injection material 82 filling the space inside the perforated walls 11 and 21 to integrate the fusing part and the surrounding ground and a base part 70 of a reinforced concrete material formed so as to be embedded in the inside of the material 30, .

The load of the upper building is transmitted to the lower portion 30 through the base portion of the reinforced concrete material, and the load of the lower portion is transmitted to the fixing portion 50 through the transmission portion 40. The fixing unit 50 is embedded in the rigid lower layer ground 20 and the outer space 51 of the fixing unit which is formed to be larger than the outer diameter of the fixing unit is filled with the injection material 82. Therefore, To the ground (20).

The fixing unit 50 and the transfer unit 40 may be integrally inserted into the fixing unit 50 immediately after the ground penetration or may be inserted while connecting the fixing unit 50 and the transfer unit 40 divided into a plurality of pieces, It is possible to advance the fixing unit 50 by pulling the fixing unit 50 at the same time when the fixing unit 50 is punched, and to perform the punching while sequentially connecting the pieces of the fixing unit 50 and the transmitting unit 40 which are divided into a plurality of units. 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, in both of the methods, the air is blown out from the lower end of the fixing unit 50 to discharge the slime generated during the punching in the step of inserting the fixing unit 50. The slurry discharging operation called air surging removes dust or stone powder from the fixing space outer space 51 so that the filling material 82 is hardened with the air wall 21 of the lower layer ground 20 and the surrounding ground So that they can be integrated with each other.

In order to smoothly perform the slime discharging operation, some dust or stone powder remaining in the fixing space outer space 51, which is a space between the outer surface of the fixing unit and the air wall 21 of the lower layer ground, And has a flow path portion 62 to be discharged to the outside.

The inner space 51 of the fixing unit and the inner space of the fixing unit 50 and the transfer unit 40 which are the spaces inside the perforated wall 21 are filled with the injection material 82, Is a rigid lower layer ground 20 around the fusing unit 50. It is difficult for the filler material 82 to be completely filled since the vacancies 11 of the soft upper layer ground 10 around the transfer part 40 are in contact with or only partially in the outer surface of the transfer part 40 And the soft upper layer ground 10 around the transmission part will support some loads, but the size is not so large, so it is preferable to exclude it from engineering calculations.

The lower part 30 is embedded in a base part 70 of a reinforced concrete material and is composed of a load plate 31 having an opening part 32 and a plurality of brackets 33 provided at an upper end of the transfer part 40 . The bracket 33 is welded to the outside of the upper end of the transmission unit 40 as shown in FIG. 2A, It will be easy to work. The loading plate 31 may be a single plate having an opening 32 as shown in FIG. 2B, and a plurality of loading plates 31 may be formed so that the opening 32 is formed at the center as shown in FIG. 2C It is possible. Although it is possible to provide the bracket 33 on the inner side of the upper end of the transmission unit 40, the convenience of the operation will not be good.

The microfibre foundation system of the present invention has a structure in which the load of the upper building is embedded in the foundation portion 70 and is connected to the solidified lower portion ground 20 around the fixing portion 50 through the integrated lower portion 30 and the transmission portion 40, To be supported.

The transfer unit 40 is preferably a hollow steel pipe having an outer diameter equal to or slightly smaller than the perforation. The fusing unit 50 is illustrated as a circular cross section for convenience, but it need not necessarily be round. For example, It is possible. It is ideal that the outer side surface of the transfer part 40 is closely contacted with the air wall 11 of the upper layer so as to prevent dust from falling off the soft upper layer ground 10 into the fixing space outer space 51. However, in an actual drilling operation, it is preferable to adjust the perforation diameter and the outer diameter of the transfer portion so that the dust is partially or partially adhered and the dust is not continuously dropped or excessively dropped.

3A shows an embodiment of the bonding portion 60. The bonding portion is coupled to the lower end of the transmitting portion 40 and the inside portion of the bonding portion is connected to a plurality of bonding means 61a And a space is formed between the joining means so as to function as the passage portion 62a. Figure 3b shows a cross section of Figure 3a. It is a matter of course that such a joint portion 60 must satisfy the structural performance capable of transmitting the load of the transfer portion 40 to the fusing portion 50.

3C shows another embodiment of the joining part 60. The joining part is bonded to the lower end of the transmitting part 40 so that the outside thereof does not protrude outside the punching hole and the inside thereof is projected inside the inside diameter of the fixing part 50 And at least one plate-like joining means (61b) coupled to the upper end of the fusing unit so as not to allow the fusing unit to transfer the load to the fusing unit. The flow path portions 62b and 62c can be formed in the joining means 62b or between the joining means 62c. When the joining means is constituted by a single plate, a channel portion 62b must be formed in the joining means itself. When a joining means is constituted by a plurality of plates, a gap is formed between the plate and the plate, (62c).

FIG. 3D shows another embodiment of the joining portion and the flow path portion. The joining portion of the joining portion is joined to the lower end of the transmitting portion and does not protrude outside the punching hole. The inner side of the joining portion is coupled to the fixing portion, And a joining means 61c in the form of a plate that does not protrude, so that the load of the transmitting portion 40 is transmitted to the fixing portion 50. [ At this time, a through hole 63 is formed near the upper end of the fixing unit 50 so as to penetrate the inside and the outside of the fixing unit 50, so that the fixing unit 50 can function as a flow path. will be.

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

1, the injection tube 81 for transferring the injection material is inserted into the transfer part 40, the upper part of the transfer part is sealed with the packer 83, and the injection material is pressurized and injected, And the harder lower layer ground 20 can be more firmly integrated.

The microfiber basic manufacturing method of the present invention will be described step by step.

A first step of perforating the soft upper layer ground 10 and the harder lower layer ground 20 to a predetermined diameter, a second step of installing a hollow fixing part 50 having an outer diameter smaller than the pore size in the perforated ground, The lower end of which is joined to the joint portion joined to the upper end of the fixing portion 50 and the upper end thereof is exposed on the surface of the earth, the outer diameter of which is larger than the outer diameter of the fixing portion, A fourth step of attaching a load part composed of a plurality of brackets and at least one load plate to the upper end of the transfer part, and a fourth step of blowing air to the lower end of the fixing part installed on the lower part ground 20, A fifth step of discharging the dust in the fixing unit outer space 51 as a space between the fixing unit and the transfer unit, and a sixth step of injecting the injection material 82 into the fixing unit and the fixing unit outer space 51, (30) is embedded in the reinforcing concrete And a seventh step of forming a base part 70 of the material so that the load of the upper building is fixed to the rigid part around the fixing part 50 through the lower part 30 integrated with the base part 70 and the transmission part 40 To the lower layer ground (20) so as to support the microfiber foundation.

The first step is the step of drilling the ground, the second step is the step of inserting the fixing part 50 into the perforated ground, and the third step is the step of inserting the transfer part 40 into the perforated ground. 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 and the transfer unit 40 may be integrally connected to each other or may be inserted while sequentially connecting the fixing unit and the transfer unit 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 second step and the third step are performed after the first step is completed and the fusing unit 50 and the transfer unit 40 are embedded within the pore size after the end of the piercing so that even if the soft upper layer ground 10 is punched The present invention can be applied to a case where the fusing unit 50 and the transfer unit 40 can be inserted and installed for a time longer than a predetermined time.

The second embodiment is applied to a case in which it is difficult to insert the fusing unit 50 and the transfer unit 40 because the puncture instrument is not fully maintained in a state where the soft upper layer ground 10 has been recovered after the perforating equipment has been recovered. The second stage of the fusing 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.

5, the perforation includes a ring bit 86 pierced with 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, And the third step can be performed simultaneously. The ring bit 86 is used for drilling using the casing and is detachably coupled to the core bit 85 to be punched at a diameter equal to or greater than the outer diameter of the casing. The core bit has a locking step 87, The end shoe 52 is pulled up. 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. This process is preferably performed by extending a rod that transmits power to the core bit 85 after a certain length of drilling and connecting the fixing unit 50 or the transfer unit 40 divided into a plurality of pieces, The process described above is repeatedly performed until a predetermined depth is reached. After the end of the drilling, air surging is performed, and the ring bit and the core bit are separated by rotation in the opposite direction to that in the drilling, and the core bit 85 ). This process is performed by connecting the fixing unit 50 and the transfer unit 40 which are divided into a plurality of pieces together with the progress of the perforation, so that after the end of the perforation, the fixing unit and the transfer unit are installed in the ground.

6, the wing bit 91 is pierced by a larger diameter than the outer diameter of the fusing unit 50, and the outer diameter of the fusing jaw is larger than the inner diameter of the tip shoe 52, The wing bit 91 is pulled into the tip shoe while rotating around the hinge pin 92 by retracting the tip shoe coupled to the tip of the fusing unit at the same time as the bite 95 is pulled by the bumper 95 and the bit housing 99 is retracted It is possible to simultaneously perform the first step, the second step and the third step using the recoverable bit 90 that can be recovered. 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. This process is preferably performed by connecting a fixing unit 50 or a transfer unit 40 which is divided into a plurality of pieces while simultaneously extending a rod that transmits power to the recoverable bit 90 after perforating a certain length of time , And the above process is repeatedly performed to puncture to a predetermined depth. After the end of the perforation, the fusing unit and the transfer unit are set in the ground. After the puncture is completed, air surging is performed, and the bit housing 99 is retracted as shown by the dotted line in FIG. 6 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 both the fusing unit 50 and the transfer unit 40 are in the form of a hollow pipe, they are inserted into the punching hole immediately after the perforation to serve as a casing for blocking the depression of the soft upper layer ground 10 outside the transfer 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-type transfer part 40, which has a function of holding the air wall 11 itself and serves as a structural member.

The fourth step is a step of joining the lower part 30 to prevent deformation or breakage of the upper end of the transmission part 40 and complementing the load transfer function. The application step 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, the fusing unit 50 is installed in the fusing unit outer space 51 between the air hole 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, To clean it so that it does not exist.

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 filling material is also called grout solution, but it is preferable to use cement milk or mortar.

In the seventh step, it is preferable that the injection material 82 injected in the sixth step proceeds in a hardened state to some degree, and it is preferable that the bottom part 30 is formed so as to be embedded in the inside thereof so as to be firmly connected to the base part 70 It is preferable to constitute a part.

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, the injection tube 81 is inserted into the transfer part 40, a packer 83 for blocking the inside of the upper part of the transfer part 40 is provided, and the injection part is pressurized, And the solid bottom layer 20 can be solidly integrated. The packer (83) is an element for blocking the opening of the hole. Rubber or urethane material is widely used, and it can be selected from a variety of products capable of closing the hole by expanding by applying air pressure.

The above process does not include the step of providing the joint portion 60 at the upper end of the fusing unit. However, since it is included in the main structure of the microfiber basic system of the present invention, It can be done before. In the case of the steel material constituting the fusing part, the transfer part and the load part, the work is carried to the site through cutting, chamfering or the like at the factory instead of the field. In such a factory, the joint part 60 is joined to the upper end of the fusing part, .

Through the above process, it is possible to manufacture a micro pile foundation through which the load of the upper building is transmitted through the soft upper layer ground to the solid bottom layer ground.

Since the amount of steel material used in the existing microfiles can be reduced by utilizing the microfiber basic system and the microfiber basic manufacturing method of the present invention, the stiffness of the structural member becomes larger than that of the conventional steel bar, There is no problem such that the structural member is bent to a certain extent before the injection, and more reliable construction is possible.

10: upper layer ground 11:
20: lower ground 21:
30: ash lower 31: load plate
32: opening 33: bracket
40:
50:
51: outer side space of the fixing unit 52:
60:
61a: joining means
61b:
61c: joining means
62a: channel portion (embodiment formed between bonding means)
62b: channel portion (embodiment formed between bonding means)
62c: channel portion (embodiment provided in the joining means)
63: Through hole
64: Through-hole stiffener
70:
71: Reinforcement 72: Concrete
81: injection tube 82: injection material
83: Packer
85: core bit 86: ring bit
87:
90: Recoverable bit
91: Wing bit 92: Hinge pin
93: connecting means 94: fixing pin
95: latching jaw 99: bit housing

Claims

A micro pile foundation system for supporting and supporting a load of a structure through a soft upper pile foundation to a solid foundation pile,
A hollow fixing unit installed in the lower ground immediately after the perforation of the ground or at the same time as the perforation and transmitting the load transmitted through the transmission unit to the surrounding ground;
The upper end of which is extended to be exposed above the surface of the ground and has an outer diameter larger than the outer diameter of the fusing part and smaller than the perforation diameter so as to prevent the air wall from falling down,
A joining portion including at least one joining means having one side joined to the upper end of the fixing portion and the other side joined to the lower end of the transmitting portion;
At least one flow path portion for allowing the dust ejected upward from the space outside the fusing unit, which is a space between the outside of the fusing unit and the air wall, through the air injected from the lower end of the fusing unit to move into the interior of the transfer unit;
A plurality of brackets joined to the inner or outer side of the upper end of the transmission part and at least one load plate provided on the bracket and protruding outward from the outer diameter of the transmission part,
An injection material filling the space inside the perforated wall to integrate the fusing part and the surrounding ground;
And a base portion of a reinforced concrete material formed to be embedded in the load portion,
And a ring shank having an outer diameter larger than an inner diameter of the shoe so that the ring bit is pierced while pulling the shoe,
Wherein the load of the upper structure is transferred to and supported by a lower portion of the lower portion integrated with the lower portion and a lower portion of the lower portion around the fixing portion through the transmission portion.

The method according to claim 1,
Wherein the connecting portion is composed of a plurality of connecting means which are coupled to the lower end of the transmitting portion and whose inner side is coupled to the upper outer side of the upper end of the fixing portion,

The method according to claim 1,
The joining portion is composed of at least one plate-shaped joining means joined to the upper end of the fixing portion so that the outside of the joining portion is joined to the lower end of the transmitting portion so as not to protrude outside the fanning portion, Characterized in that a flow path portion is formed between the means or the joining means

The method according to claim 1,
The joining portion is composed of a joining means in the form of a plate which is joined to the lower end of the transmitting portion but does not protrude outside the punching hole and the inner side thereof is joined to the fixing portion and does not protrude into the inner diameter of the fixing portion,
Wherein the flow path portion includes a through hole provided to penetrate the inside and the outside of the fusing unit.

The method according to claim 1,
Wherein a base portion is formed such that a portion of the reinforcing bars of the base portion is disposed below the load plate and the remaining portion is disposed above the load plate.

The method according to claim 1,
Characterized in that an injection tube for transferring the injection material is inserted into the transfer part, the upper part of the transfer part is sealed, and the injection material is pressed and injected.

In constructing a foundation system that penetrates 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 fixing part having an outer diameter smaller than the pore size in a perforated ground;
A third step of joining a lower end of the fixing part to a joining part bonded to the upper end of the fixing part and having an upper end thereof exposed on the surface of the ground and having an outer diameter larger than the outer diameter of the fixing part and smaller than or equal to the pile diameter;
A fourth step of joining a load part composed of a plurality of brackets and at least one load plate to the upper end of the transmission part;
A fifth step of blowing air to the lower end of the fixing unit installed on the lower layer ground to discharge the dust in the space outside the fixing unit, which is a space between the outer surface of the fixing unit, and the air wall, to the outside;
A sixth step of injecting an injection material into the fixing unit, the interior of the transfer unit, and the space outside the fixing unit;
And a seventh step of forming a base portion of the reinforcing concrete material so that the reinforcing portion is embedded in the reinforcing concrete portion
The load of the upper structure is transferred to and supported by the lower portion of the material integrated with the base portion and the lower portion of the solidified portion around the fusing portion through the transfer portion,
The puncturing is performed by pulling the end shoe coupled to the tip of the fusing unit at the same time of puncture by a ring bit punctured to a diameter larger than the outer diameter of the fusing unit and an outer diameter larger than the inner diameter of the tip shoe, A core bit which is separated and enters the inside of the shoe so as to be recovered is used, or the wing bit is pierced by a larger diameter than the outer diameter of the fusing part, and at the same time as the perforation by the engaging jaw having an outer diameter larger than the inner diameter of the tip shoe, And the bit housing is retracted to return the wing bit to the inside of the tip shoe while rotating around the hinge pin, and using the recoverable bit that can be recovered, the first step, the second step, And three steps are simultaneously performed.

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8. The method of claim 7,
Wherein the sixth step is performed by inserting the injection tube into the transfer part and installing a packer for closing the inside of the upper part of the transfer part and pressing the injection material