KR101488971B1 - Supporting pile with double steel pipe and construction method thereof - Google Patents

Abstract

The present invention relates to a support pile having a lower end made of a double steel pipe and a method of constructing the support pile. The support pile according to the present invention is characterized in that, in order to secure the support stability in drying a building structure or civil structure, A pile member provided in the form of a tube having a cavity formed therein, the cement based filler being filled and cured in the excavation hole to be supported and fixed on the ground; An outer steel pipe formed along the longitudinal direction at a lower side of the pile body and having a predetermined diameter and an inner steel pipe provided at a smaller diameter than the outer steel pipe and spaced apart from the inside of the outer steel pipe, A dual steel pipe for forming an open space between the inner and outer steel pipes and the inner steel pipe to allow the introduction of the gravel into the space when the ground is penetrated; A connecting plate interposed between a lower end of the pile body and an upper end of the double steel pipe and having a hollow hole formed at the center thereof to disperse stress transmitted from the double steel pipe; .
According to the present invention, since the double bottomed steel pipe having the lower end portion penetrated into the supporting ground is composed of the inner and outer steel pipes, the closure effect is maximized by the inner space of the inner steel pipe and the space between the inner and outer steel pipes, The support piles can be easily inserted into the hard pavement due to the narrow bottom area of the double steel pipe and the shape of the lower end surface of the steel pipe can be fixed to the support pavement And a reinforcing member disposed in the inside of the pile body in the inside of the pile body to improve the bonding strength between the pile body and the double steel pipe, In a state in which penetration resistance penetrates into a certain depth through a rotating blade provided on the outer peripheral surface of the support member By rotating the work, it is possible to further penetrate the rotation, so that the air flow and construction noise required for the construction can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a support file having a double-

More particularly, the present invention relates to a support pile having a lower end portion made of a double steel pipe and a method of manufacturing the support pile. More particularly, the present invention can greatly improve the support force of the lower end portion of the support pile, And a lower end portion of which is lowered to reduce the number of holes and noise required for installation of the support pile, and a method of installing the support pile.

In general, when the building structure or civil structure is dried on the ground, when the ground is weak or the load of the building structure or the civil structure is large, a support file made of concrete or the like is used for securing a sufficient supporting force against the load.

As shown in FIG. 1, the conventional support pile 10 is made of a concrete circular pipe having a cavity formed therein. When the support pile 10 is formed on a construction site or BG on a construction site of a civil engineering structure And then inserted into the excavation hole 20 and then poured into the excavation hole 20 by pouring a cementitious filling material 30 such as soil cement to fill and cure.

However, such a conventional support pile 10 is hard to secure a sufficient supporting force of the lower end portion of the support pile 10 due to the slime SM generated at the bottom surface of the drilling hole 20 during the drilling operation for forming the drilling hole 20 When the groundwater level is high, the support pile 10 floats or tilts due to the buoyancy during the construction, so that the inconvenience of the work process requiring the additional measurement of the position of the support pile 10 have.

In order to solve such a problem, after the support pile 10 is inserted into the excavation hole 20, the supporting force of the lower end portion is secured by the pestle penetration method in which the support pile 10 is inserted into the bottom surface of the excavation hole 20 by the striking method, The cement-based filling material 30 is poured into the excavation hole 20 to fill and cure.

However, when the PHC file of the conventional support file 10 has a large area at the bottom and is installed on a hard ground, the penetration of the horses is difficult, and a lot of watering at the horses is required, .

In order to avoid such a problem, there is a disadvantage in that it is not possible to stably secure the lower end supporting force of the support pawl 10 if the support pawl 10 is installed without intruding enough plow.

A simple steel pipe file, which is an open section type file among the conventional support files 10, has a problem that the lower end area thereof is too narrow, so that stress can be concentrated on a part of the steel pipe file, .

In addition, such a steel pipe file can be expected to increase the bearing capacity of the lower end of the support file due to the clogging effect due to the frictional force between the ground and the inner surface of the file at the time of hovering. However, since the inner space of the lower end of the file is wide, There is a disadvantage in that the increase of the bearing capacity of the lower end due to the clogging effect is limited.

Since the lower end surface of the conventional support pile 10 is not deformed at the time of manufacture, when the surface of the hard support pile is inclined, the lower surface of the support pile 10 at the lower end of the support pile 10 It is difficult to apply the torque to the hard ground supporting the inclined surface such that the supporting file is inclined due to the stress.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a structure capable of maximizing the clogging effect of the open-ended file, ensuring sufficient durability so as not to be damaged at the time of construction while reducing the bottom area of the file, Which can be easily penetrated even when the intrusion resistance is increased, and a method of constructing the support file.

In order to solve the above-mentioned problems, in order to secure the stability of the support during the drying of the building structure or the civil engineering structure, the cement-based filling material is filled in the excavation hole formed in the ground, A support structure for supporting and fixing a support structure, the support structure comprising: An outer steel pipe formed along the longitudinal direction at the lower side of the pile body and having an outer diameter equal to the outer diameter of the pile body; and an inner steel pipe provided at a smaller diameter than the outer steel pipe and spaced apart from the inside of the outer steel pipe, A double steel pipe formed between the inside of the inner steel pipe, the outer steel pipe and the inner steel pipe to form an open space for the inflow of the gravel upon penetration of the ground; And an outer diameter of the pile body is equal to an outer diameter of the pile body and an outer diameter of the outer steel tube, and a hollow hole having the same or larger than the cavity of the pile body is formed at the center of the pile body, A connecting plate for dispersing stress transmitted from the connecting plate; And a control unit.
Wherein the support file includes at least one support member fixedly installed to protrude inward in a connecting portion of the inner steel pipe or the connecting plate or the connecting plate; And a reinforcing member which is installed in a plurality of support holes formed in the support member and is positioned from a lower portion of the hollow portion to an upper portion of the inner steel pipe so as to improve a coupling strength between the pile member and the double steel pipe at the time of construction; And further comprising:
Wherein the inner steel pipe is formed on an inner circumferential surface of the inner steel pipe so as to prevent the cement based filler inside the excavation hole from flowing into the reinforcement through the lower end of the inner steel pipe at the time of construction; Further comprising:
The support file is provided on the outer circumferential surface of the outer steel pipe so as to improve the adhesion of the double steel pipe to the ground and to pierce the double steel pipe into the bottom surface of the excavation hole as the support pile rotates The rotating wing portion; And further comprising:

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According to the support file having the lower end of the present invention as a double steel pipe and the method of constructing the same, it is possible to provide a support pipe having a double bottomed steel pipe, So that the lower end portion of the support pile can be firmly fixed to the supporting ground since the clogging effect at the lower end portion of the support pile is maximized.

Also, due to the lower area of the dual steel pipe, which is relatively narrower than the conventional PHC file, it is possible to easily insert the support file into the hard ground, The bottom area can effectively prevent damage to the bottom of the file due to stress concentration while exerting a supporting force at the time of construction.

In addition, since the shape of the lower end surface of the double steel pipe is provided corresponding to the surface shape of the support ground, stress is concentrated on one side of the lower end of the support pile at the time of hovering, thereby preventing occurrence of torque, It is possible to prevent inclination.

In addition, even if the support file is implemented in a form in which the connecting plate and the double steel tube are combined at the lower end of the filament body, the reinforcing body located in the inside of the double steel tube is provided inside the filament body so that the joining strength between the filament body, And sufficient durability can be ensured.

In addition, in the state where the penetration resistance penetrates through the rotary blade part provided on the outer circumferential surface of the double steel pipe and the penetration resistance is increased, the rotation of the support pile can be performed, thereby reducing the airflow required for installation and construction noise.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing a state in which a conventional support file is installed,
FIG. 2 is a cross-sectional view of a support file in which a lower end portion according to a first embodiment of the present invention is provided with a double steel pipe,
Figure 3 is a cross-sectional view of AA shown in Figure 2,
FIGS. 4A to 4D illustrate the results of a 3D structure analysis of a support file having a lower end portion as a single steel pipe and a support file having a lower end portion as a double steel pipe according to the first embodiment of the present invention,
5 is a sectional view showing a state in which a support pile having a lower end portion is formed as a double steel pipe according to a first embodiment of the present invention,
FIG. 6 is a sectional view showing a state in which a support pillar provided at an inclined lower end of a double steel pipe corresponds to a slope of a support ground, according to a first embodiment of the present invention;
7 is a sectional view showing a modified embodiment in which a concrete filler is provided between inner and outer steel pipes instead of reinforcing ribs for improving the durability of the double steel pipes according to the first embodiment of the present invention;
FIG. 8 is a cross-sectional view of a support file in which a lower end portion is provided as a double steel pipe according to a second embodiment of the present invention;
9 is a sectional view of BB shown in Fig. 8,
FIG. 10 is a sectional view showing a state in which a support pile having a lower end portion is formed as a double steel pipe according to a second embodiment of the present invention,
FIG. 11 is a cross-sectional view of a support file having a lower end in a double steel pipe according to a third embodiment of the present invention, FIG.
12 is a cross-sectional view of CC shown in Fig. 11,
FIG. 13 is a sectional view showing a state in which a support pile having a lower end portion is formed as a double steel pipe according to a third embodiment of the present invention,
FIG. 14 is a cross-sectional view showing a support file in which a lower end portion is provided as a double steel pipe according to a third embodiment of the present invention,
FIG. 15 is a sectional view of a support file having a lower end portion as a double steel pipe according to a third embodiment of the present invention, in a deformed state in which a shielding plate is provided on an inner steel pipe,
FIG. 16 is a cross-sectional view of a support file having a lower end in a double steel tube according to a fourth embodiment of the present invention; FIG.
17 is a cross-sectional view of DD shown in Fig. 15,
FIG. 18 is a sectional view showing a state in which a support pile having a lower end portion is formed as a double steel pipe according to a fourth embodiment of the present invention,
19 is a flowchart showing a method of constructing a support pile having a lower end portion as a double steel pipe according to the first embodiment of the present invention;
FIGS. 20A to 20E are views for explaining a method of constructing a support file in which a lower end according to the first embodiment of the present invention is provided as a double steel pipe,
FIG. 21 is a flowchart showing a method of constructing a support file having a lower end portion as a double steel pipe according to a second embodiment of the present invention; FIG.
FIGS. 22A to 22G are views for explaining a method of constructing a support pile having a lower end portion as a double steel pipe according to a second embodiment of the present invention,
23 is a flowchart showing a method of constructing a support file having a lower end portion as a double steel pipe according to a third embodiment of the present invention;
24A to 24G are views for explaining a method of constructing a support pile having a lower end portion as a double steel pipe according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art will be able to easily carry out the present invention . The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The support file (hereinafter, abbreviated as 'support file') having the lower end according to the present invention as a double steel pipe (hereinafter, referred to as 'support file') and its construction method are to be constructed in order to secure the support stability in the case of building structure or civil structure The pile is installed in the excavation hole formed in the ground, and the cement filling material is filled and cured so as to surround the outer circumference of the pile.

Here, the term "ground" refers to the ground and the ground exposed after the earthquake for the drying of the building structure or the civil engineering structure. In the following description, the support ground means a portion having high strength located in the ground, And the supporting part of the pile.

In the drawings for explaining the four embodiments of the support file and the two embodiments of the support file construction method, components having substantially the same shape and function, even in different embodiments, , And the duplicate description thereof is omitted.

Hereinafter, with reference to FIGS. 2 to 5, the structure and effect of the support file according to the first embodiment of the present invention will be described in detail.

The supporting file according to the first embodiment of the present invention includes a pile body 100, a connecting plate 200, and a dual steel pipe 300.

The pile body 100 is provided in a tubular shape having a hollow portion 110 therein. Specifically, a prefabricated file such as a PHC file or a steel pipe file can be applied.

The connecting plate 200 has a hollow hole 210 formed at the center of the connecting plate 200 and is provided in a plate shape having a predetermined thickness and is interposed between the lower end of the pile body 100 and the upper end of the double steel pipe 300, 300 to minimize the occurrence of deformation due to stress concentration.

As shown in the figure, the connecting plate 200 may have a shape and a size corresponding to the planar shape of the space between the inner and outer steel pipes 320 and 310, Or may have a shape and size corresponding to the bottom shape of the pile body 100 and may be provided in a free shape and size without such constraint.

However, as in the third embodiment described later, the inner and outer steel pipes 320 and 310 are provided in a shape and size corresponding to the planar shape of the space between the inner and outer steel pipes 320 and 310 as long as there is no special purpose such as increasing durability of the support member 400 The unnecessary portion of the connecting plate 200 can be minimized, which is the most economical.

As shown in FIGS. 2 and 3, the double steel pipe 300 has an outer steel pipe 310 having a predetermined diameter and a diameter smaller than that of the outer steel pipe 310, An inner steel pipe 320 and a plurality of reinforcing ribs 330 spaced apart from each other and fixed to the lower surface of the connecting plate 200 along the longitudinal direction of the pile body 100.

Such a double steel pipe 300 can reduce the size of the lower end area of the support pile significantly compared to the PHC pile so that the support pile can be easily inserted into the hard pile BG, The lower surface of the outer steel pipe 310 and the lower surface of the inner steel pipe 320 are disposed at intervals to disperse and support the support pile, thereby preventing damage to the lower end of the support pile due to stress concentration at the time of construction.

The reinforcing rib 330 is provided in a plate shape connecting the outer steel pipe 310 and the inner steel pipe 320 to improve the durability of the steel pipe 300. However, it should be noted that the shape of the reinforcing rib 330 is not limited to this, and is not essential in the present invention.

In the case where the lower end of the support pile is provided as a single steel pipe rather than the double steel pipe 300, the lower end of the support pipe made of a single steel pipe is likely to be damaged by the stress concentration at the time of construction, The connecting plate 200 for dispersing the stress is not only required to be provided with a higher strength member but also has a weak clogging effect and insufficient securing of the high holding force, so that the lower end of the supporting pile is preferably embodied as a double steel pipe.

4A to 4D illustrate a case where the lower end of the support pile is provided as a single steel pipe and the case where the support pipe is provided as a dual steel pipe 300, And a structural analysis result of a single steel pipe, a double steel pipe 300 and a connecting plate 200 at the lower end of the support pile when the same load corresponding to the load of the pile is applied.

In this 3D structure analysis, the supporting pile having the lower end portion as a single steel pipe is made of a single steel pipe of SKK490 having an outer diameter of 400 mm, an inner diameter of 270 mm, and an outer diameter of 400 mm and a thickness of 12 mm at the lower end of the PHC pile having a thickness of 65 mm And a lower end portion of which is a double steel pipe 300 according to the first embodiment of the present invention, a PHC file having an outer diameter of 400 mm, an inner diameter of 270 mm, and a thickness of 65 mm is applied as the pile body 100, The steel pipe 300 is formed by applying an outer steel pipe 310 having an outer diameter of 400 mm and a thickness of 12 mm and a steel pipe 300 made of SKK490 made of an inner steel pipe 320 having an outer diameter of 318.5 mm and a thickness of 9 mm. The connecting plate 200 is made of SKK400 having a relatively thin thickness of 5 mm.

As shown in FIGS. 4A and 4B, it can be seen that stress is very concentrated at the connecting portion between the connecting plate 200 and the single steel pipe, and the Von Mises stress is applied to the single steel pipe 4C and FIG. 4D, the support file in which the lower end is provided as the double steel pipe 300 is measured while the stress is dispersed in the support pipe 200, The Von Mises stress of the connecting plate 200 was reduced by 44% compared to the case where the Von Mises stress was 161.7 MPa, and the Von Mises stress of the connecting plate 200 was decreased by 16% by 125 MPa.

As a result of analyzing the angular displacement of the connecting plate 200 caused by the stress concentration in the two cases, the connecting plate of the supporting pile having the lower end portion as a single steel pipe was found to have an angular displacement (differential settlement) of 1/591, While the connection plate 200 of the support pile having the lower end portion of the double pipe 300 has a much smaller angular displacement of 1/2057 measured and the support file having the lower end portion of the double pipe 300 is connected The deformation of the plate 200 is much reduced.

Meanwhile, the pile body 100 and the double steel pipe 300 may be manufactured in a size different from that of the prefabricated product. However, a combination of the prefabricated PHC file and the steel pipe may be applied. The following table is an example in which an assembled PHC and a steel pipe are applied in combination in the first embodiment of the present invention, but the combination is not limited thereto.

File body (PHC file) Double steel pipe Outside diameter (mm) Thickness (mm) Internal diameter (mm) Outer diameter of outer steel pipe (mm) Outer diameter of inner steel pipe (mm) 300 60 180 300, 267.4
(339.7-318.5) 216.5 400 65 270 400, 355.6
(457.2, 406.4) 318.5, 323.8, 339.7,
(267.4) 500 80 340 500, 457.2
(558.8, 508) 406.4, 355.6 600 90 420 600, 558.8
(609.6) 508, 457.2 700 100 500 700, 609.6
(711.2) 609.6, 558.5,
(500) 800 110 580 800, 711.2
(812.8) 609.6, 600 900 120 660 900, 812.8
(914.4) 711.2, 700 1000 130 740 1000, 914.4
(1016) 812.8, 800 1100 140 820 1100, 1016 914.4, 900 1200 150 900 1200, 1100 1016, 1000,
(900)

Particularly, in Table 1, the numerical values indicated by the parentheses of the outer steel pipe 310 are different from those shown in the drawing, in which the diameter of the outer steel pipe 310 is larger than the outer diameter of the pile 100, And the numerical values indicated by parentheses of the inner steel pipe 320 are different from those shown in the figure, in which the diameter of the inner steel pipe 320 is smaller than or equal to the inner diameter of the pile 100, .

On the other hand, the thickness of the inner and outer steel pipes 320 and 310 can be appropriately selected according to the size and construction conditions of the pile 100 and the double steel pipe 300.

As shown in FIG. 5, the support pipe according to the first embodiment of the present invention includes an outer steel pipe 310 formed at a lower side of the pile body 100 with a predetermined diameter along the longitudinal direction, And an inner steel pipe 320 provided at a smaller diameter than the outer steel pipe 310 and spaced apart from the inside of the outer steel pipe 310. The inner steel pipe 320 and the outer steel pipe 310, A space is formed between the inner steel pipes 320 to open the lower part.
When the dual steel pipe 300 having such a configuration is inserted into the supporting ground BG 'from the bottom surface of the excavation hole 20, the inner space of the inner steel pipe 320 and the inner space of the inner and outer steel pipes 320 and 310 The clogging effect at the same time in which the soil is gathered in the inner space is maximized and the clogging effect at the lower end of the support pile is maximized to thereby maximize the double effect of the double pile steel pipe 300 forming the lower end portion of the support pile, It can be firmly fixed to the supporting ground BG 'while acting integrally with the applied load.

That is, as the soil moves into the inside of the dual steel pipe 300, the occlusion effect generated inside is faster than the single steel pipe, and the inner and outer steel pipes 320 and 310 are formed inside the steel pipe 300, The bearing capacity is maximized due to the structural characteristic that the frictional resistance between the inner circumferential surfaces of the inner circumferential surface and the soil is largely expressed.

6, the inner and outer steel pipes 320 'and 310' constituting the double steel pipe 300 'are formed in the same shape as the drilling hole 20, as shown in FIG. 6, in the supporting file according to the first embodiment of the present invention. The inner and outer steel pipes 320 'and 310' may have different lengths on one side and the other on the lower side so as to correspond to the inclination of the surface of the support ground BG 'positioned on the lower side of the support base BG'.

When the surface of the support ground BG 'is inclined as described above, the stress is concentrated on the lower end of the support pile at the time of hitting the support pile, so that the lower end of the support pile is deformed and broken and a torque is generated. As shown in FIG. 6, if the bottom surfaces of the inner and outer steel pipes 320 'and 310' are provided so as to correspond to the surface shape of the supporting ground BG ' It is possible to prevent deformation, breakage, and torque of the support pile from being tilted at the time of pendant propulsion.

Of course, when the surface of the supporting ground BG 'is not a uniform slope but is concave or convex, the lengths of the inner and outer steel pipes 320' and 310 'may be different from each other have.

Also, even when the reaction force patterns of sandy soil and clayey soils are greatly different, it is possible to prevent the support file from being inclined at the time of construction by adjusting the lengths of the inner and outer steel pipes 320 'and 310'.

The support pile according to the first embodiment of the present invention is provided with a plate-like reinforcing rib 330 as a component for improving the durability of the dual steel pipe 300. However, as shown in Fig. 7, 330 may be replaced by a concrete filler 341 filled between the outer steel pipe 310 and the inner steel pipe 320 so as to be cured to improve the durability of the steel pipe 300.

The supporting pile may be provided with a filling wall 340 between the inner and outer steel pipes 320 and 310 so that the concrete filling material 341 can be filled and cured. In FIG. 7, the filling wall 340 is provided at the center of the dual steel pipe 300, but may be provided above or below the filling pipe 340.

Hereinafter, the structure and effect of the support file according to the second embodiment of the present invention will be described in detail with reference to FIGS. 8 to 10. FIG. The support pile according to the second embodiment of the present invention is formed so that the shape of the inner steel pipe 320 " constituting the double steel pipe 300 ", and the shape of the inner steel pipe 320 ", except for the configuration of the first and second reinforcement members 311 and 321, The configuration of the support file according to the first embodiment of the invention is similar to that of the support file according to the first embodiment of the invention. Therefore, the shape of the inner steel pipe 320 '' of the support pile according to the second embodiment of the present invention and the configurations of the first and second reinforcement members 311 and 321 will be mainly described below.

The inner steel pipe 320 '' is provided not in the shape of a complete pipe but in a tubular shape partly opened at intervals of 90 °. The upper end of the inner steel pipe 320 '' is fixed to the connecting plate 200 and may have a reinforcing rib 330 connected to the outer steel pipe 310 '' for improved durability.

Thus, in the present invention, the outer steel pipe 310 " and the inner steel pipe 320 " are not limited to typical full pipe members, Members can also be freely applied.

The first reinforcing member 311 is formed in a wing shape and is fixed to the outer circumferential surface of the outer steel pipe 310 ''. The second reinforcing member 321 is provided in the form of a protruded reinforcing bar to form an inner steel pipe 320 ' As shown in Fig.

As shown in FIG. 10, the first and second reinforcing members 311 and 321 are cement based filling parts formed by curing the cement based filling material 30 and the inner and outer steel pipes 320 ' 310 '' of the support pile while further improving the lower end support force of the support pile.

However, the shapes of the first and second reinforcing members 311 and 321 are not limited to the wing shape or the reinforcing bar shape, and various protruding shapes that can prevent the occurrence of slip can be applied. Can be applied.

For example, as shown in FIG. 9, the second reinforcing members 321 may not be provided with four reinforcing bars separated by an interval of less than 90 degrees, have. Also, the second reinforcement member 321 may be formed in a hexahedral shape, and a T-shaped steel, a c-shaped steel, or the like may be variously applied.

It is preferable that the first and second reinforcing members 311 and 321 are installed on the upper part of the double steel pipe 300 '' so as not to interfere with the penetration of the double steel pipe 300 '' when the support pile is constructed.

10, the support pile according to the second embodiment of the present invention is provided with a high-strength cement-based filler 31 (see FIG. 10) on the lower part of the excavation hole 20 'where the first and second reinforcement members 311 and 321 are located. ) Can be filled in first, so that the bottom support force of the support pile can be maximized.

Hereinafter, the structure and effect of the support file according to the third embodiment of the present invention will be described in detail with reference to Figs. 11 to 15. Fig. The support pile according to the third embodiment of the present invention has the same structure as that of the support 100 according to the first embodiment of the present invention except for the shape of the connection plate 200 'and the configurations of the plurality of support members 400 and the reinforcement member 500. [ The file and its configuration are similar. Therefore, the shape of the connection plate 200 'of the support pile according to the third embodiment of the present invention and the configuration of the plurality of support members 400 and the reinforcement member 500 will be mainly described.

The connecting plate 200 'has a shape and size corresponding to the bottom shape of the pile body 100. This is because the connection strength of the supporting member 400 to the connecting plate 200' .

The plurality of support members 400 are fixedly installed at the connection portion between the connection plate 200 and the inner steel pipe 320 so as to protrude inward of the support pile. The reinforcement member 500 is inserted into the support hole 410 and supported by the reinforcing bar 510 of the reinforcing member 500 so that the reinforcing member 500 is positioned inside the pile 100 from the inside of the double steel pipe 300 .

The plurality of support members 400 are fixed to the connecting portion between the connecting plate 200 and the inner steel pipe 320 to improve the bonding strength of the double steel pipe 300 to the connecting plate 200 ' And the double pipe 200 'and the double pipe 300, respectively.

In the third embodiment of the present invention, four support members 400 are provided at intervals of 90 degrees, but the number of the support members 400 is not limited thereto, and the shape of the support members 400 is not limited to that shown in FIG. In particular, the shape and the number of the supporting member 400 may be variously modified depending on the shape of the reinforcing member 500.

 The reinforcing member 500 is supported by the supporting member 400 at the time of construction so as to improve the bonding strength between the pile body 100 and the double steel pipe 300 so that the inner steel pipe 320 ). ≪ / RTI >

The reinforcement member 500 is impregnated into the inner steel pipe 320 and the cement based filler 30 flowing into the cavity 110 when the support pile is inserted into the excavation hole 20 filled with the cementitious filler 30 The bonding strength of the pile body 100, the connecting plate 200 ', and the double steel pipe 300 can be improved so that the pile body 100, the double steel pipe 300, and the double steel pipe 300 can behave integrally.

To this end, the reinforcing member 500 includes four reinforcing bars 510 and a plurality of connecting rods 520, and is provided in the form of a single reinforcing bar.

The four reinforcing rods 510 are located in the longitudinal direction of the supporting piles and serve to substantially improve the bonding strength of the pile body 100, the connecting plate 200 'and the double steel pipe 300, (520) connects and fixes four reinforcing rods (510) to each other.

As shown in FIG. 10, the reinforcing bar 510 is bent so as to have a curved bent portion 511 (see FIG. 10) so that the distance between the upper end portion and the inner circumferential surface of the pile body 100 and the distance between the lower end portion thereof and the inner circumferential surface of the inner steel pipe 320, Is provided at the center.

If the distance between the upper end of the reinforcing rod 510 and the inner circumferential surface of the pile body 100 or the gap between the lower end of the reinforcing rod 510 and the inner circumferential surface of the inner steel pipe 320 is not more than a predetermined distance, The filling path of the cementitious filler 30 can not be sufficiently secured when the cement based filler 30 flows into the cavity 110 and the cavity 110, 200 'and the double steel pipe 300, respectively.

The bent portion 511 of the reinforcing bar 510 plays a role of ensuring a sufficient inflow path of the cement based filler 30 so as to prevent such gaps.

The bent portion 511 of the reinforcing bar 510 serves as a sort of stopper for guiding the position of the reinforcing member 500 with respect to the supporting member 400 when the reinforcing member 500 is installed on the supporting member 400 . That is, when the reinforcing bar 510 is inserted into the supporting hole 410 of the supporting member 400 to the bent portion 511 of the reinforcing bar 510, the reinforcing bar 510 is no longer inserted And the position of the reinforcing member 500 is fixed by its own weight.

As shown in FIG. 13, when the cement based filler 30 introduced into the support pile is impregnated with the reinforcing member 500, It can be seen that the bonding strength between the body 100, the connecting plate 200 'and the double steel pipe 300 increases.

Here, it is necessary to provide the reinforcement member 500 with a proper length so that the lower end of the reinforcement member 500 does not contact the bottom surface of the excavation hole 20 even if the support file is intruded.

In the third embodiment of the present invention, the plurality of support members 400 are fixed to the connecting portion between the connecting plate 200 and the inner steel pipe 320, but the fixing positions thereof are not limited thereto, The plurality of support members 400 'may be fixedly installed only on the inner circumferential surface of the inner steel pipe 320 or may be fixed to the connection plate 200 only.

In this case, the reinforcing rod 510 may be provided with a separate locking member 512 serving as a stopper for guiding the position of the reinforcing member 500 with respect to the plurality of supporting members 400 '.

The reinforcement member 500 does not necessarily have to be formed in the form of a reinforcing bar with the reinforcing bar 510 and the supporting member 400 and may be formed of a pile 100, a connecting plate 200 ' A variety of shapes and materials that are faithful to the function of improving the bonding strength of the base material can be freely applied.

In addition, the number of the reinforcing bars 510 constituting the reinforcing member 500 is not limited to four, and a plurality of reinforcing bars 510 may be provided so that the reinforcing bars 510, which are not supported by the supporting member 400, May be provided.

In addition, the support pile according to the third embodiment of the present invention may be manufactured with the reinforcing member 500 installed therein, and the reinforcing member 500 may be installed at the construction site.

15, a cement-based filler 30 is inserted into an inner steel pipe 320 at the time of constructing a support file, as shown in FIG. 15, The shielding plate 322 may be provided to shield the reinforcement member 500 from being introduced into the reinforcement member 500 through the lower end of the shielding plate 322.

The shielding plate 322 prevents the cement based filler 30 containing impurities such as slime SM present on the bottom surface of the excavation hole 20 from flowing into the reinforcement member 500 during the construction of the support pile The reinforcing member 500 is impregnated and cured so that the pile body 100, the connecting plate 200 ', and the double steel pipe 300 are filled with the reinforcing member 500, Thereby maximizing the role of the reinforcing member 500 for increasing the bonding strength of the reinforcing member 500.

Hereinafter, the structure and effect of the support file according to the fourth embodiment of the present invention will be described in detail with reference to Figs. 16 to 18. Fig. The supporting pile according to the fourth embodiment of the present invention includes a pile body 100 ', a reinforcing plate 140, a connecting plate 200' ', a supporting plate 220 and a rotating blade unit 600, The structure of the support file 300 is similar to that of the support file according to the first embodiment of the present invention. Therefore, a description will be given below of a case where the pile body 100 ', the reinforcing plate 140, the connecting plate 200' ', the supporting plate 220, and the rotating blade unit 600 of the supporting pile according to the fourth embodiment of the present invention Explain.

In the first, second, and third embodiments described above, if the file bodies 100 are all PHC files, the file body 100 'of the support file according to the fourth embodiment is a steel pipe file.

A combined body of the connecting plate 200 '' and the double steel pipe 300 is welded to the lower side of the pile body 100 'provided with the steel pipe file to form a supporting file. At this time, a reinforcing plate 140 capable of improving the bonding strength may be further provided at the connection portion.

On the upper surface of the connection plate 200 '', a cylindrical support plate 220 is provided. The support plate 220 is disposed between the upper surface of the connection plate 200 '' and the inner surface of the pile body 100 ' And serves to receive the cement based filler 30 so that it can be completely filled with the filler 30.

In the case of the fourth embodiment of the present invention, the case in which the cementitious filling material 30 is completely filled between the upper surface of the connecting plate 200 '' and the inner surface of the pile body 100 ' The stress applied to the plate 200 " can be effectively dispersed.

The rotary vane 600 is provided on the outer circumferential surface of the outer steel pipe 310 in a screw shape to improve the adhesion of the double steel pipe 300 to the ground BG, Likewise, as the support file is rotated, the dual steel pipe 300 is rotated to penetrate the bottom surface of the excavation hole 20 'and the support ground BG'.

Since the support pile 600 is primarily driven by the rotary vane 600, the support pile can be rotated by the rotation of the support pile in a state where the penetration resistance is increased, so that the airflow required for the construction and the construction noise can be reduced.

Since the support pile according to the fourth embodiment of the present invention is constructed so as to be additionally subjected to the second rotary penetration after the primary hull penetration construction, It is preferable to install it at the center portion of the outer steel pipe 310 as shown in FIG. 16 so as not to interfere with the penetration.

In the fourth embodiment of the present invention, one rotary vane 600 is formed in the shape of a screw of 360 °, but the shape and the number of the rotary vane 600 are not limited thereto. For example, four screws may be alternately arranged in a 180-degree screw shape.

Hereinafter, with reference to FIGS. 19 to 20E, a method of constructing the support file according to the first embodiment of the present invention, which is a method of constructing the support file according to the third embodiment of the present invention, will be described in detail.

20A, the reinforcement member 500 is inserted into the cavity 110 to insert the reinforcement rod 510 into the support hole 410 of the support member 400, Is installed inside the support file (s110). At this time, the bending portion 511 of the reinforcing rod 510 can not be inserted any more and is caught in the support hole 410, so that the installation position of the reinforcing member 500 with respect to the support member 400 is guided.

As shown in FIG. 20B, a digging hole 20 is formed in the ground BG to the vicinity of the supporting ground BG '(S120). At this time, there is a slime SM on the bottom surface of the excavation hole 20 that can lower the supporting force of the lower end of the support pile.

Then, as shown in FIG. 20C, the cement based filler 30 is poured into the excavation hole 20 to fill it (s130).

Then, as shown in FIG. 20D, the support pile having completed the assembling operation of the reinforcement body 500 is inserted into the excavation hole 20, and the lower end of the double steel pipe 300 is placed on the bottom surface of the excavation hole 20 (s140).

Thereafter, as shown in FIG. 20E, the dual steel pipe 300 is inserted into the supporting ground BG '(S150) by hitting the upper end of the pile body 100, and the cement based filling material 30 is cured By curing, the construction of the support pile is completed.

In the method of constructing the support pile according to the first embodiment of the present invention, the filling operation of the cement-based filling material 30 to the excavation hole 20 is performed all at once, but the high- And the cement mortar 30 may be further filled into the excavation hole 20 or the support pile after the mortar is poured into the support pile.

Hereinafter, a method of constructing the support file according to the second embodiment of the present invention, which is a method of constructing the support file according to the fourth embodiment of the present invention, will be described in detail with reference to FIGS. 21 to 22G.

First, as shown in FIG. 22 (a), the pile body 100 'and the joint plate 200' ', which are manufactured separately from each other, and the combined assembly of the dual steel tubes 300 are connected to each other, The pile body 100 'and the combined body of the connecting plate 200' 'and the double steel pipe 300 are coupled to each other with the reinforcing plate 140 for reinforcing the connecting part as shown in step S210.

As shown in FIG. 22C, a drilling hole 20 'is formed in the ground BG to the vicinity of the supporting ground BG' (S220).

Then, as shown in Fig. 22D, the cement based filling material 30 is poured into the inside of the excavation hole 20 '(s230).

Thereafter, as shown in FIG. 22E, the supporting file in which the coupling operation is completed is inserted into the excavation hole 20 'to seat the lower end of the dual steel pipe 300 on the bottom surface of the excavation hole 20' (s240).

Next, as shown in FIG. 22F, the double steel pipe 300 is stuck to the supporting ground BG 'by a predetermined depth (a predetermined depth of penetration resistance is generated) by striking the upper end of the pile body 100' (S250).

Thereafter, as shown in FIG. 22G, after rotating the support file to further rotate the dual steel pipe 300 to the support ground BG 'to complete the penetration operation (s260), the cement based filler 30 Curing is cured to complete the construction of the support pile.

When the penetration of the support pile is proceeded through the penetration after the introduction of the hire, the double steel pipe 300 can be quickly inserted into the supporting ground BG 'at the initial stage of the installation where the penetration resistance is not large, It is possible to complete the intrusion construction quietly and easily through the rotation intrusion.

Hereinafter, with reference to FIGS. 23 to 24G, there will be described a method for constructing a support file according to a modified form in which the shielding plate 322 is provided on the inner steel pipe 320 of the third embodiment of the present invention described above. The construction method of the support pile according to the third embodiment will be described in detail.

24A, the reinforcement member 500 is inserted into the cavity 110 to fit the reinforcement rod 510 into the support hole 410 of the support member 400, Is installed inside the support file (s310). At this time, the bending portion 511 of the reinforcing rod 510 can not be inserted any more and is caught in the support hole 410, so that the installation position of the reinforcing member 500 with respect to the support member 400 is guided.

As shown in FIG. 24B, the digging hole 20 is formed in the ground BG to the vicinity of the supporting ground BG '(s320). At this time, there is a slime SM on the bottom surface of the excavation hole 20 that can lower the supporting force of the lower end of the support pile.

Then, as shown in FIG. 24C, the cement based filler 30 is poured into the excavation hole 20 to fill it (s330).

24D, a supporting pile having completed the assembling operation of the reinforcing member 500 is inserted into the excavation hole 20 to seat the lower end of the double steel pipe 300 on the bottom surface of the excavation hole 20 (s340).

Next, as shown in FIG. 24E, the dual steel pipe 300 is inserted into the supporting ground BG 'by hitting the top of the pile body 100 (s350). The shielding plate 322 formed on the inner circumferential surface of the inner steel pipe 320 is prevented from flowing into the reinforcement member 500 from the lower end of the inner steel pipe 320 when the cementitious filler 30 containing impurities such as slime SM .

Thereafter, the concrete filler 40 is filled in the support pile (s360), and the concrete filler 40 not containing the impurity is hardened by impregnating the reinforcement member 500, 200 'and the reinforcing member 500 that increases the bonding strength of the dual steel pipe 300 is maximized.

Meanwhile, when the method of constructing the support pile according to the third embodiment of the present invention is performed, buoyancy may be generated to some extent because the inside of the support pile is blocked by the shielding plate 322, Can be solved by adding appropriate measures that are obvious to the ordinary skilled artisan.

As described above, according to the support pile having the lower end portion of the present invention as a double steel pipe and the method of constructing the same, a double steel pipe (320) having a lower end portion penetrating into the support base (BG) The inner space of the inner steel pipe 320 and the space between the inner and outer steel pipes 320 and 310 maximize the clogging effect so that the lower end of the support pile is firmly fixed to the supporting ground BG The support pile can be easily inserted into the hard ground BG due to the narrow bottom surface area of the double steel pipe 300 and the shape of the lower end surface of the dual steel pipe 300 can be easily changed And a reinforcing member 500 disposed inside the pile body 100 and positioned inside the pile 300 so as to prevent the supporting pile from tilting when the pile tube is inserted, 100) and the double steel pipe 300 In addition, in the state where penetration resistance penetrates through the rotary blade unit 600 provided on the outer circumferential surface of the dual steel pipe 300 and penetrates into a certain depth, the supporting pile can be further rotated by rotating the supporting pile, The required airflow and construction noise can also be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. Of course.

Description of the Related Art [0002]
100, 100 ': filament body 110, 110': cavity
120: joint plate 130: reinforcement band
140: reinforcing plate 200, 200 ', 200 ": connecting plate
210, 210 ', 210'': hollow hole 220:
300, 300 ', 300 ": double steel pipes 310, 310', 310"
311: first reinforcing member 320, 320 ', 320 ": inner steel pipe
321: second reinforcing member 322: shielding plate
330: reinforcing rib 340: filled wall
341: Concrete filler material 400, 400 ': Support member
410, 410 ': Support hole 500:
510: reinforcing rod 511: bend
512: latching member 520: connecting rod
600: rotating blade portion 20, 20 ': excavation hole
30: Cement based filler 31: High-strength cement based filler
40: Concrete filler BG: Soil
BG ': supporting ground SM: slime

Claims (11)

The support pile is installed in the excavation hole formed in the ground to secure the support stability when the building structure or the civil engineering structure is dried, and the cement filling material is filled and cured in the excavation hole to be fixed to the ground,
A pile body provided in a tubular shape having a cavity formed therein;
An outer steel pipe formed along the longitudinal direction at the lower side of the pile body and having an outer diameter equal to the outer diameter of the pile body; and an inner steel pipe provided at a smaller diameter than the outer steel pipe and spaced apart from the inside of the outer steel pipe, A double steel pipe formed between the inside of the inner steel pipe, the outer steel pipe and the inner steel pipe to form an open space for the inflow of the gravel upon penetration of the ground; And
A hollow hole is formed between the lower end of the pile body and the upper end of the double steel pipe and has an outer diameter equal to the outer diameter of the pile body and the outer diameter of the outer steel pipe, A connecting plate for dispersing the transmitted stress; And a lower end portion of the support pipe is formed as a double steel pipe. delete The method according to claim 1,
The support file includes:
At least one support member fixedly installed to protrude inward in a connecting portion of the inner steel pipe or the connecting plate or the connecting plate; And
A reinforcing body which is provided in a plurality of support holes formed in the support member and is positioned from a lower portion of the hollow portion to an upper portion of the inner steel pipe so as to improve a coupling strength between the pile body and the double steel pipe at the time of construction;
And a lower end of the support pipe is provided as a double steel pipe. delete delete delete The method of claim 3,
The inner steel pipe,
A shielding plate formed on an inner circumferential surface of the inner steel pipe so as to prevent the cement based filler inside the excavation hole from flowing into the reinforcement through the lower end of the inner steel pipe at the time of construction;
And a lower end portion of the support pipe is provided as a double steel pipe. The method according to claim 1,
The support file includes:
One or more rotary vanes provided in a screw shape on the outer circumferential surface of the outer steel pipe for enhancing the adhesion of the double steel pipe to the ground and rotating the double steel pipe to the bottom surface of the excavation hole as the support pile rotates;
And a lower end of the support pipe is provided as a double steel pipe. delete delete delete

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