KR20140142902A - Alternation pressure type foundation strengthening apparatus and method - Google Patents

Abstract

The present invention relates to an alternate pressure type foundation reinforcing apparatus and a foundation reinforcing method capable of minimizing an effect on environment, performing indentation construction of a pile in a narrow space of a building, being simply installed and moved, and reducing the entire construction period by quickly being constructed and overcoming a slow operation speed specific to a hydraulic cylinder while controlling press-in load according to the condition of the ground. The foundation reinforcing apparatus comprises: a support frame which includes a pair of vertical frames which vertically stand to be apart from each other and are fixed to surface of the ground and a horizontal frame which connects upper end parts of the vertical frames; a sliding member which slides laterally along the horizontal frame; and first and second hydraulic cylinders which are laterally installed to the sliding member in parallel to be laterally moved and continuously press a foundation pile in the ground while being alternately moved by the sliding member in a horizontal direction.

Description

TECHNICAL FIELD [0001] The present invention relates to an alternate pressing type basic reinforcing apparatus and a basic reinforcing method,

The present invention relates to a basic reinforcement apparatus, and more particularly, to a reinforcement apparatus for a basic reinforcement apparatus capable of minimizing the influence on the surroundings, permitting the insertion of a file in a narrow space in a building, The present invention relates to an alternate press-fit type basic reinforcement device and a basic reinforcement method which can shorten the total air by overcoming a characteristic slow operating speed of a hydraulic cylinder and enabling quick construction.

Generally, in case where a settlement occurs in the applied structure or the foundation should be reinforced, up to now, a method of injecting cement liquid or mortar into the ground has been used. However, it is difficult to secure and evaluate the quality of the construction result, The present invention has the problem that the additional settlement is mostly suppressed and that even if the soft ground layer is thick or the height to be raised is large, it is possible to reinforce or raise the structure, excessive cost is required.

 In addition, since the heavy equipment should be carried to the drilling position inside the structure in the perforation for injection, the construction itself may be impossible or additional damage may be caused.

 In addition, the use of high pressure air compressors or suspension punching methods may further impair the damage caused by air pressure or the liquefaction of the ground before the injection material hardens. The drilling method by auger was mostly not applicable to existing structures.

 On the other hand, the method by press-fitting the steel pipe file is an eco-friendly method of noiseless silent noise. After the steel pipe file is press-fitted to the required hard layer, not only the lifting and basic reinforcement of the sub- And the internal strength of the indentation file can be accurately detected. Thus, it can be said that the method can solve the existing problems.

However, in the case where the reaction force device can not be used for the subsided structure, that is, in applying the method by the above-mentioned file press-fitting in the limited closed space that is not open, there is no development of concrete support for the press- The need for technology development has been raised.

Accordingly, Korean Patent No. 0321669 (Aug. 31, 2006) discloses a more concrete method of press-fitting a file using an abrasive article. According to this method, a perforation hole is formed in an inner bottom surface of a closed structure, a lower end fixing portion of a reaction force including a reinforcing bar is fixed to the lower hole of the structure, and the upper end of the reaction force is fixed to the upper support, A step of installing a supporting body, setting a pressing body in the perforation hole, and then installing and operating a pressing means between the pressing body upper end and the upper supporting body to press the pressing body into the lower part of the structure, And a step of raising the structure by installing it.

However, in the case of the above-described related art, the process of installing the reaction force support and the press-in means is very complicated, and it is extremely difficult to install the reaction force support and the press-in means once installed.

In addition, since it takes a long time to press the other file due to the specific slow operation time of the hydraulic cylinder after press-fitting one file, there is a fatal problem that the entire construction time becomes too long by using only one reaction force support and press- .

Korean Patent No. 0321669 (Aug. 31, 2006)

It is therefore an object of the present invention to minimize the influence on the surroundings and to be able to press-fit a file even in a narrow space in a building, And to provide a basic reinforcement device and a basic reinforcement method that can overcome a slow operation speed peculiar to a hydraulic cylinder and enable rapid construction while controlling an indentation load according to a state of a stratum.

In order to achieve the above object, an alternate press-fit type basic reinforcing apparatus according to the technical idea of the present invention comprises a pair of vertical frames vertically erected with mutual spacing and fixed to the surface of a ground layer, A support frame made up of a horizontal frame installed therein; A sliding member slidably installed laterally along the horizontal frame; A first hydraulic cylinder and a second hydraulic cylinder which are installed side by side on the sliding member so as to be movable left and right, and which can press the foundation file continuously without delay, while alternately moving left and right by the sliding member; The present invention is characterized by its technical structure.

Here, the horizontal frame has a H-shaped cross-section, and the flange of the H-shaped steel is positioned on the upper side and the lower side, respectively, and the sliding member is slidably coupled to the flange located on the lower side of the H- .

In addition, a plate is provided at the lower end of the vertical frame, and an anchor for fixing the plate to the surface of the ground layer is provided.

The foundation piles may be formed with female threads and male threads at the upper and lower ends, respectively, so that the foundation piles can be connected to each other up and down.

In addition, a press-fitting shoe is provided at the lower end of a plurality of foundation papers press-fitted into the ground layer by the first hydraulic cylinder and the second hydraulic cylinder so as to be installed at the lower end of the foundation pile to be initially press- Wherein the press-fit shoe is formed in a ring shape so as to be engageable with a lower end portion of the foundation pile, and has an inclined outer circumferential surface that decreases in outer diameter toward the lower end, and an inner diameter of the lower end is narrower than an inner diameter of the foundation pile, And the outer diameter of the upper end portion is formed to be wider than the outer diameter of the foundation pile to form a stepped portion protruding outward when fastened to the foundation pile.

The apparatus may further include an extension member positioned between the arms of the first hydraulic cylinder and the second hydraulic cylinder and the base pile to extend the length of the arm.

On the other hand, in the alternate press-fit type basic reinforcing method according to the present invention, in the basic reinforcing method in which the foundation piles are alternately press-

A first hydraulic cylinder and a second hydraulic cylinder provided side by side,

After the base pile is pressed into the ground layer by the first hydraulic cylinder, the second hydraulic cylinder in which the arm is in the raised state is positioned instead of the first hydraulic cylinder without waiting for the time for the arm of the first hydraulic cylinder to rise The new foundation file is connected to the upper end of the foundation file press-fitted into the foundation layer by the first hydraulic cylinder and is press-fitted without delay by the second hydraulic cylinder, the foundation pile is press-fitted into the foundation layer by the second hydraulic cylinder, The first hydraulic cylinder in which the arm is in an elevated state is positioned in place of the second hydraulic cylinder without waiting for the time for the arm of the second hydraulic cylinder to rise and another new foundation file is previously pressed into the ground layer by the second hydraulic cylinder And the first hydraulic cylinder and the second hydraulic cylinder are alternately replaced in such a manner that the first hydraulic cylinder and the second hydraulic cylinder are press-fitted without delay by the first hydraulic cylinder To subsequently press-fitted into the chopail characterized in that on the technical configuration.

Here, the surface of the stratum may be drilled to a certain depth before the first foundation file among the plurality of foundation files is press-fitted to hold the indentation place.

When the first foundation file among the plurality of foundation files is press-fitted, the pressure applied by the first hydraulic cylinder is stepped up until the foundation file is press-fitted into the foundation layer, and the pressure at which the foundation file is press- And the pressure is reset to apply to the second hydraulic cylinder.

The alternate press-in type basic reinforcing apparatus and the basic reinforcing method according to the present invention are capable of alternately pressing the first and second hydraulic cylinders while alternately moving the first hydraulic cylinder and the second hydraulic cylinder, It is possible to quickly construct the foundation pile, thereby greatly shortening the total air.

In addition, since the present invention is a method of press-fitting a foundation pile using a pair of hydraulic cylinders, the influence to the surroundings can be minimized because there is no vibration or noise.

In addition, the present invention is configured such that the inverted U-shaped support frame is configured as a basic skeleton and the pair of hydraulic cylinders can be moved by hand so that the file can be pressed and installed even in a narrow work space in the building.

In addition, the present invention is configured to step-press the press-fitting pressure so that the optimum press-fitting pressure can be reset according to the state of the ground layer, and it is possible to grasp the actual resistance strength or rigidity of the ground layer.

Further, according to the present invention, it is possible to easily press-fit the foundation pile with respect to the ground layer by the constitution including the press-in shoe, and to strongly improve the supporting force of the press-fitted foundation pile.

1 is a perspective view for explaining an alternate pressing type basic reinforcing apparatus according to an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view for explaining an engagement relationship between a horizontal frame and a sliding member in an alternate press-fit type basic reinforcing apparatus according to an embodiment of the present invention. FIG.
3 is an assembled perspective view for explaining the constitution and the coupling relationship of the foundation pile and the press-fitting shoe in the alternate press-in type basic reinforcing apparatus according to the embodiment of the present invention.
4A to 4G are a series of reference drawings for explaining an alternate press-fit type basic reinforcement method according to an embodiment of the present invention.

The alternate pressing type basic reinforcing apparatus and the basic reinforcing method according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention, and are actually shown in a smaller scale than the actual dimensions in order to understand the schematic structure.

Also, the terms first and second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a perspective view for explaining an alternate press-in type basic reinforcing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a combined relationship between a horizontal frame and a sliding member in an alternate pressing type basic reinforcing apparatus according to an embodiment of the present invention Fig. 3 is an assembled perspective view for explaining the structure and coupling relationship of the foundation pile and the press-fitting shoe in the alternate press-fit type basic reinforcing apparatus according to the embodiment of the present invention.

As shown in the figure, the alternate press-fit basic reinforcing apparatus of the present invention includes a support frame 110 for supporting a reaction force due to press-fitting, a first hydraulic cylinder 120a and a second hydraulic cylinder 120b, A sliding member 130 for sliding the first hydraulic cylinder 120a and the second hydraulic cylinder 120b to the left and right, an extension member 140 and an indentation shoe 160, The first hydraulic cylinder 120a and the second hydraulic cylinder 120b can be alternately press-fitted into the base pile 150 while alternately moving the first hydraulic cylinder 120a and the second hydraulic cylinder 120b with the sliding member 130, Despite the use of cylinders, rapid indenting of the base file is possible.

Hereinafter, the configuration of an alternate press-fit type basic reinforcing apparatus according to an embodiment of the present invention will be described in detail with reference to the above-described components.

The support frame 110 supports a reaction force generated when the foundation pile 150 is press-fitted. The support frame 110 includes a pair of vertical frames 111 vertically erected with mutual spacing and fixed to the surface of the foundation layer, And a horizontal frame 112 connected to upper ends of the vertical frame 111, and has an inverted U-shape as a whole.

The vertical frame 111 and the horizontal frame 112 are preferably formed of H-shaped steel having high strength so as to sufficiently support a reaction force due to press-fitting. In the horizontal frame 112, the H-shaped steel is placed laterally so as to serve as a rail with respect to the sliding member 130, and the flanges 1112a and 112b are positioned on the upper and lower sides with respect to the web 112c, respectively . Thus, the sliding member 130 can be slidably engaged with the lower flange 112b as a rail.

The lower end of the vertical frame 111 of the support frame 110 is firmly fixed to the ground layer by an anchor 111a. To this end, a plate 111a having an area wider than an area occupied by the vertical frame 111 is further provided at the lower end of the vertical frame 111, and an anchor 111a for fixing the plate 111a to the surface of the ground layer, Respectively. The standard and the quantity of the anchor 111a may be determined in consideration of a reaction force expected when the foundation file 150 is press-fitted, and the anchor 111a may be formed by drilling a ground layer with a drill, Insert it and tighten it with a nut. However, if the slab S is installed on the surface of the stratum as shown in FIG. 1, the slab S may be pierced to provide the anchor 111a. As compared with the case where the slab S is directly installed on the stratum without the slab S, ) Is relatively short.

According to the structure of the support frame 110, it is possible to provide a sufficient supporting force to support the first hydraulic cylinder 120a and the second hydraulic cylinder 120b with respect to the reaction force generated when the base pile 150 is press- And after the nut fastening of the anchor 111a is released, it is possible to simply mount and move.

The first hydraulic cylinder 120a and the second hydraulic cylinder 120b are configured to press-fit the base pile 150 alternately while moving left and right. The first hydraulic cylinder 120a and the second hydraulic cylinder 120b include a body 121 and an arm 122 that moves forward and backward from the body 121 And are disposed side by side on the sliding member 130 to be moved together when the sliding member 130 moves left and right along the horizontal frame 112. [ According to such a configuration, the base pile 150 is press-fitted into the first hydraulic cylinder 120a once while the base pile 150 is press-fitted into the second hydraulic cylinder 120b once, while the sliding member 130 is moved. So that the base file 150 can be pressed in alternately. At this time, in order to press-fit the base file 150, the arm 122 of each hydraulic cylinder is immediately depressed with respect to the base file 150 by using the other hydraulic cylinder without waiting for a long time to rise again . This allows quick construction while overcoming the slow operating speed associated with the use of hydraulic cylinders.

The sliding member 130 moves the first hydraulic cylinder 120a and the second hydraulic cylinder 120b alternately left and right. To this end, the sliding member 130 is slidably coupled to the lower flange 112b of the horizontal frame 112 having the H-shaped steel lying horizontally. The sliding member 130 is coupled to the lower flange 112b of the horizontal frame 112 as shown in FIG. 2, the sliding member 130 includes a sliding guide 131 having a lower flange 112b as a rail and slidably disposed on both sides of the lower flange 112b, And a support panel 132 for supporting the first hydraulic cylinder 120a and the second hydraulic cylinder 120b while connecting the pair of sliding guides 131 on the lower side. A grease for lubricating is applied to the area of the lower flange 112b of the horizontal frame 112 where the sliding guide 131 and the support panel 132 are in contact with each other when the sliding member 130 is moved. When the sliding member 130 is provided, an operator can easily hold the body 121 of the first hydraulic cylinder 120a or the second hydraulic cylinder 120b and move it laterally along the horizontal frame 112.

The extension member 140 may be inserted between the arm 122 of the first hydraulic cylinder 120a and the second hydraulic cylinder 120b and the base pile 150 to extend the length of the arm 122 . The extension member 140 is made of a steel and has a short cylindrical shape. Although the upper and lower widths of the extension member 140 are shown to be relatively short, the lengths of the first hydraulic cylinder 120a and the second hydraulic cylinder 120b It is of course possible to have a longer vertical width in consideration of the working length.

The press shoe 160 is located at the lowermost one of the plurality of foundation piles 150 press-fitted into the ground layer by the first hydraulic cylinder 120a and the second hydraulic cylinder 120b, (Not shown). As shown in FIG. 3, the indentation shoe 160 is formed in a ring shape having a female screw 161 for an inner diameter so as to be screwed to a male screw 151 formed at a lower end of the base pile 150 And has an outer circumferential surface 164 inclined so that the outer diameter decreases toward the lower end. Here, the press-fitting shoe 180 may be fastened to the lower end of the foundation pile 150 not only by screwing but also by a fitting method or by a welding method. However, the joining by the welding method is advantageous in terms of cost Therefore, it can be said that it is most preferable.

Thus, when the press-fitting shoe 160 has the inclined outer peripheral surface 164, it can be easily press-fitted into the ground layer when the same pressure is applied. The inner diameter 163 at the lower end of the press-fitting shoe 160 is formed to be narrower than the inner diameter of the foundation pile 150. This is because the amount of the clay flowing into the foundation pile 150 when press- So that the contact friction of the stratum introduced into the inner circumferential surface of the foundation pile 150 is reduced so that the press-fitting of the foundation pile 150 is not disturbed. The outer diameter of the upper end of the press-fit shoe 160 is formed to be wider than the outer diameter of the base pile 150 so as to form a step portion 162 protruding outward when fastened to the base pile 150, When the base file 150 is once press-fitted into the layer, the support force can be more firmly exhibited. The contact and friction of the ground layer can be reduced with respect to the outer circumferential surface of the foundation pile 150 that is pushed in by the step portion 162 protruding from the most distal end portion when being pressed into the ground layer such as a clay layer, So as not to be disturbed.

For reference, the base pile 150 used in the alternate pressing type basic reinforcing apparatus according to the embodiment of the present invention is formed with a female screw 152 and a male screw 151 at the upper end and the lower end, respectively, so that they can be connected to each other. The foundation file 150 may have various specifications in consideration of the conditions of the construction site. The minimum standard for construction in a narrow space in the building may be about 1000 mm in the vertical length. For example, when the foundation file 150 of this standard is used, nearly 30 pieces are used when the foundation file 150 is pressed into the ground layer at a depth of 30 m. The construction period and the number of the points to be constructed by press-fitting the foundation piles 150 are sufficiently taken into consideration, the construction is carried out while moving the seat after the initial number of the alternate pressing type basic reinforcing apparatuses according to the embodiment of the present invention is installed as needed.

The alternate press-fit type basic reinforcement method according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings, including FIGS. 4A to 4G. 4A to 4G are a series of reference views for explaining an alternate press-fit type basic reinforcement method according to an embodiment of the present invention.

First, as shown in FIG. 4A, the entire apparatus including the support frame 110 is moved to a position for press-fitting the foundation pile 150, and then fixed to the surface of the foundation layer. For this purpose, the plate 111a provided at the lower end of the vertical frame 111 is inserted into the slab S (in the case where the slab S is installed) and the surface of the stratum are firmly fixed to each other by a method of inserting the anchor 111a and fastening the nut Fixed.

Thereafter, when the layer including the slab S is present on the surface of the stratum such that the layer is difficult to be press-fitted, such as an obelisk, it is perforated to a certain depth to hold the indentation H for press-fitting the foundation pile 150. At this time, a crawler drill or a core drill may be used. At the same time, the sliding member 130 is slid along the horizontal frame 112 to move the first hydraulic cylinder 120a directly above the press-fitting seat H.

Thereafter, as shown in FIG. 4B, one of the base pads 150 to be initially press-fitted is first inserted into the press-fitting seat H for supporting the press-fitting shoe 160 at the lower end thereof, The extension member 140 is sandwiched between the arm 122 of the main body 120a and the base file 150. Then, the clearance between the first hydraulic cylinder 120a and the base pile 150 disappears, and the base pile 150 can be press-fit.

Thereafter, as shown in FIG. 4C, the first hydraulic cylinder 120a is operated to lower the arm 122, and the base pile 150, which has been seated, begins to be pressed into the ground layer. At this time, the initial pressure applied through the arm 122 of the first hydraulic cylinder 120a is predicted and set based on the basic survey data on the ground layer. If the initial pressure pushes the foundation pile 150 against the ground layer, The pressure applied until the basic file 150 is press-fitted is stepped up, and the pressure at which the actual foundation pile 150 is press-fitted is reset to the press-fitting pressure and applied to the second hydraulic cylinder 120b do.

4D, when the base pile 150 is fully inserted by the first hydraulic cylinder 120a, the arm 122 of the first hydraulic cylinder 120a does not wait for a time for the arm 122 to rise, The sliding member 130 is moved so as to position the second hydraulic cylinder 120b in a state in which the arm 122 is lifted above the press-fit seat H in place of the press-fitting seat 120a.

4E, the new basic file 150 is screwed and connected to the upper end of the foundation pile 150 which is press-fitted into the ground layer by the first hydraulic cylinder 120a, and the second hydraulic cylinder 120b, The extension member 140 is sandwiched between the arm 122 and the new foundation pile 150. [

Thereafter, the second hydraulic cylinder 120b is operated without delay to lower the arm 122 to press the new foundation pile 150 into the foundation layer as shown in Fig. 4g. At this time, the pressure applied by the second hydraulic cylinder 120b depends on the pressurizing pressure that has been reset above. Thus, the press-fitting operation for the two basic files 150 is completed.

When the press of the new base pile 150 is completed by the second hydraulic cylinder 120b as described above, the second hydraulic cylinder 120b is pushed in, The first hydraulic cylinder 120a in which the arm 122 is lifted is positioned in place of the hydraulic cylinder 120b and another new foundation pile 150 is pushed into the ground layer by the second hydraulic cylinder 120b The first hydraulic cylinder 120a and the second hydraulic cylinder 120b are alternately connected in such a manner that they are connected to the upper end of the foundation pile 150 and press-fitted by the first hydraulic cylinder 120a without delay, ) Alternately.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

110: support frame 111: vertical frame
111a: plate 111b: anchor
112: horizontal frame 120a, 120b: first hydraulic cylinder, second hydraulic cylinder
121: body 122: arm
130: Sliding member 131: Sliding guide
132: support panel 140: extension member
150: Foundation file 160: Indentation shoe

Claims (11)

A supporting frame formed of a pair of vertical frames vertically erected with mutual spacing and fixed to the surface of the ground layer and a horizontal frame connected with upper ends of the vertical frame;
A sliding member slidably installed laterally along the horizontal frame;
And a first hydraulic cylinder and a second hydraulic cylinder which are arranged side by side on the sliding member so as to be movable left and right, and which can press the base file continuously into the layer while alternately moving left and right by the sliding member Wherein the first reinforcing member and the second reinforcing reinforcing reinforcing member are made of a metal. The method according to claim 1,
Wherein the horizontal frame has an H-shaped cross-section lying transversely, and a flange of the H-shaped section is positioned on the upper side and the lower side, respectively,
Wherein the sliding member includes a pair of sliding guides that are slidably disposed on both sides of the lower flange of the H-shaped portion as a rail and a pair of sliding guides which are connected to each other at a lower side of the lower flange, And a support panel for supporting the hydraulic cylinder and the second hydraulic cylinder. 3. The method of claim 2,
And an anchor for fixing the plate to the surface of the ground layer is provided at a lower end of the vertical frame. The method according to claim 1,
Wherein the foundation piles are formed with a female screw and a male screw at an upper end and a lower end, respectively, so that the foundation piles can be connected to each other up and down. 5. The method of claim 4,
A shoe for press-fitting is provided at the lower end of a plurality of foundation papers press-fitted into the ground layer by the first hydraulic cylinder and the second hydraulic cylinder so as to be installed at the lower end of the foundation pile to be first press-
Wherein the press-fit shoe is formed in a ring shape so as to be engageable with a lower end portion of the foundation pile, and has an inclined outer circumferential surface that decreases in outer diameter toward the lower end, and an inner diameter of the lower end is narrower than an inner diameter of the foundation pile, Wherein an outer diameter of the upper end portion is formed wider than an outer diameter of the foundation pile to form a step portion projecting outwardly when fastened to the foundation pile. 5. The method of claim 4,
Further comprising an extension member positioned between the arms of the first hydraulic cylinder and the second hydraulic cylinder and the base pile to extend the length of the arm. A foundation reinforcing method for reinforcing a foundation by press-fitting a foundation file continuously in multiple stages,
A first hydraulic cylinder and a second hydraulic cylinder provided side by side,
After the base pile is pressed into the ground layer by the first hydraulic cylinder, the second hydraulic cylinder in which the arm is in the raised state is positioned instead of the first hydraulic cylinder without waiting for the time for the arm of the first hydraulic cylinder to rise A new foundation file is connected to the upper end of the foundation file press-fitted in the ground layer by the first hydraulic cylinder and is press-fitted by the second hydraulic cylinder without delay,
A first hydraulic cylinder in which the arm is in an elevated state in place of the second hydraulic cylinder is positioned at a position corresponding to the position of the second hydraulic cylinder, And another new basic file is connected to the upper end of the base file pressed in advance by the second hydraulic cylinder, and the first hydraulic cylinder and the second hydraulic cylinder are alternately replaced in such a manner that they are pressed in by the first hydraulic cylinder without delay Characterized in that the foundation file is continuously press-fitted. 8. The method of claim 7,
Wherein the foundation file is formed by a female screw and a male screw at the upper end and the lower end, respectively, so that the foundation files are screwed together with each other. 9. The method of claim 8,
A shoe for press-fitting is provided at the lower end of a foundation pile which is located at the lowermost end of the plurality of foundation piles press-fitted into the ground layer by the first hydraulic cylinder and the second hydraulic cylinder,
Wherein the press-fit shoe is formed in a ring shape so as to be engageable with a lower end portion of the foundation pile, and has an inclined outer circumferential surface that decreases in outer diameter toward the lower end, and an inner diameter of the lower end is narrower than an inner diameter of the foundation pile, Wherein the outer diameter of the upper end portion is formed wider than the outer diameter of the foundation pile to form a step portion protruding outwardly when fastened to the foundation pile. The method according to claim 1,
Wherein the surface of the stratum is drilled to a certain depth by drilling before the first foundation file of the plurality of foundation files is press-fitted, thereby holding the indentation for reinforcement. 11. The method of claim 10,
The pressure applied by the first hydraulic cylinder is increased step by step until the foundation file is press-fitted into the foundation layer, and the pressure at which the foundation file is press-fitted is set to the press-fitting pressure And is applied to the second hydraulic cylinder.

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