KR101791211B1

KR101791211B1 - Helix steel pipe pile construction method for reinforcement of buckling

Info

Publication number: KR101791211B1
Application number: KR1020150146596A
Authority: KR
Inventors: 오명호; 노연식; 김영호
Original assignee: 고강이앤씨(주)
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2017-10-31
Also published as: KR20170046362A

Abstract

In the present invention, the non-clay perforation method which directly rotates and presses into the required support layer reduces turbulent disturbance and penetration resistance at the tip during rotation, prevents the pivot of the steel pipe pile at the upper portion, The present invention provides a method for constructing a pillar of a steel-reinforced steel pipe for buckling reinforcement. A helix steel pipe pile for buckling reinforcement according to a preferred embodiment of the present invention comprises a first shaft having a predetermined length, a tip bit having a bit projection distributed on a surface thereof and bonded to a tip of the first shaft, A lower steel pipe made of a helical platen joined to a lower side of the lower steel pipe; An upper steel pipe having a second shaft having a diameter equal to that of the first shaft at a predetermined length, and a sleeve stopper fixed to an intermediate portion of the second shaft; The shaft is inserted into the second shaft of the upper steel pipe so as to be rotatably engaged with the sleeve stopper so as to be prevented from ascending and is prevented from pivoting in the radial direction when the helix steel pipe pile is rotated, And a buckling preventing sleeve for increasing a horizontal resisting force.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pile construction method,

The present invention relates to a method of constructing a helix steel pipe pile for buckling reinforcement, and more particularly, to a method of constructing a pile of a steel pipe pile by directly rotating and pressing the pile to a required support layer, And a method of constructing a helix steel pipe pile for buckling reinforcement so that lateral buckling can be effectively prevented even if it is constructed with a long depth.

If the length of the pile is longer than the cross-sectional size of the main pile, such as column supporting the vertical load (compressive force) in the underground, buckling (transverse buckling, torsional buckling) occurs in the ground so that the yield strength (fy) The pile vertical design bearing capacity is determined by reducing the yield strength of the material according to the geometric aspect ratio (slenderness ratio) without using 100%. Therefore, it is important to be able to suppress buckling of the pile in the ground.

The pile construction method is a type pile method in which pile is directly installed by applying impact energy directly to the pile, or a rotary pile pile method in which a pile is rotated while being intruded. As mentioned above, these piles have a large effect on the length (slenderness ratio), but it is important to construct the pile satisfying the vertical degree (slope prevention). This results in the eccentricity of the vertical load due to the inclination of the top and bottom of the pile, and the supporting force of the vertical design decreases remarkably due to the eccentric moment generated in the pile. Therefore, it is important to construct piles with good vertical penetration so that piles are not tilted.

As a background technology of the present invention, Korean Patent Registration No. 10-0869815 has proposed a method for expanding the supporting capacity of the end portion of a steel pipe for an embedded pile and a method for constructing an embedded pile. The reinforcing member is fixed on the inner side of the front end portion of the steel pipe. The reinforcement member is fixed on the inner side of the front end portion of the steel pipe, A step of excavating the ground by using a screw to form a drilling hole, a step of forming a concrete layer by placing concrete on the inner lower side of the drilling hole, A step of inserting a steel pipe to which a tip end supporting force expanding device is fixed in a drilling hole and filling the tip end portion of the steel pipe into a concrete layer and filling an upper space of the concrete layer with a filler material, It is possible to increase the supporting force of the steel pipe by increasing the bonding force with the tip portion and concrete .

However, the above background art has a disadvantage in that it takes a long period of construction due to excavation work, concrete pouring and curing period in order to obtain the tip end supporting force, weak pull resistance, and there is no effective way to suppress lateral buckling when a long depth is applied I have.

Korean Registered Patent Registration No. 10-0869815 (Expansion force of the tip end of a steel pipe for a pile and method of constructing a pile)

The present invention is based on the non-plaster boring method which directly rotates and presses into the required supporting layer, causing turbulent disturbance at the tip during rotation penetration to reduce the penetration resistance, prevent the pivoting of the steel pipe pile at the upper part, The present invention provides a method of constructing a pillar of a steel-reinforced steel pipe for buckling reinforcement.

According to a preferred embodiment of the present invention, there is provided a method of constructing a helix steel pipe pile for buckling reinforcement,
(a) a first shaft having a lower coupling stopper at an upper end thereof, a tip bit having a bit protrusion joined to the tip of the first shaft and distributed over a plurality of surfaces, and a helical pressure plate joined to a lower side of the first shaft Rotating the lower steel pipe to a predetermined depth;
(b) a second shaft having the same diameter as the first shaft and having a helical pressure plate, a sleeve stopper fixed to an intermediate portion of the second shaft, and an inverted T-shaped engaging jaw for transmitting a rotational force to the lower coupling stopper And an upper steel pipe provided with a fastening blocking plate having an air hole at a lower end for a concrete synthetic pile and a sleeve for preventing buckling at an intermediate portion are connected to the upper end of the lower steel pipe through an upper coupling, A step of integrally rotating the steel pipe to bury the buckling preventing sleeve in the ground layer;
(c) installing a pair of inner and outer perforated steel plates for reinforcing the head of the upper steel pipe, and then reinforcing the head of the head by connecting the steel bars;
(d) placing the abandoned concrete on the ground where the steel pipe pile is penetrated, placing the foundation steel and filling the inner filling mortar into the upper part of the upper steel pipe.
In addition, when the penetration of the steel pipe pile is deep, a third shaft having the same diameter as the first shaft and having a helical pressure plate is connected to the lower end of the third shaft before the upper steel pipe is connected after the step (a) An intermediate coupling for transmitting a rotational force to the coupling stopper, and at least one intermediate steel pipe having a plurality of intermediate coupling stoppers disposed at regular intervals on the outer circumferential surface of the upper end of the third shaft, And then rotating the upper steel pipe through the final stage.

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According to the method of constructing a pile of a steel pile for buckling reinforcement according to the present invention, a pile pile having a helical pillar attached to a steel pipe is directly pivoted and press-fitted into a required support layer. Construction that reduces resistance is possible.

Further, the supporting force is improved by the helical pressure plate, and the resistance against compression and tensile is increased.

Also, when a steel pipe pile is installed with a long depth, it is possible to prevent lateral buckling by showing a bending moment point at a position where a buckling preventing sleeve is inserted.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a perspective view of a helix steel pipe pile for buckling reinforcement applied to the present invention.
Fig. 2 is an exploded perspective view of Fig. 1; Fig.
Figure 3 is a front view of Figure 1;
4 is a front view of an intermediate steel pipe used in the present invention.
5 (a) and 5 (b) are a perspective view and a front view of the inner and outer perforated steel sheets included in the head reinforcement device applied to the present invention.
FIG. 6 is a view showing a construction state of a pile of a steel pipe for buckling reinforcement according to the present invention.
FIG. 7 is a view showing a construction state of a helix steel pipe pile for buckling reinforcement in a state in which an intermediate steel pipe according to the present invention is further assembled. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

1 to 3, the buckling-reinforcing helix steel pipe pile 10 according to the present invention can be self-pierced by the leading end bit 122. Therefore, the perforation using the perforator and the casing pulling operation become unnecessary. In addition, since the buckling preventing sleeve 16 assembled to the final-stage upper steel pipe 14 is penetrated into the stratum according to the present invention, the bending moment resistance point is further generated in the stratum, so that the resisting force against buckling is increased and buckling is suppressed. In addition, in the head reinforcement structure, the inner filling plate 15 is installed deep inside the upper steel pipe 14, and the bent steel plate is formed into a three-dimensional shape with a pair of back-to-back joints, Thereby providing a construction method.

The buckling reinforcing helix steel pipe pile 10 is composed of a lower steel pipe 12, an upper steel pipe 14 and a buckling preventing sleeve 16, and if necessary, an intermediate steel pipe 18 is added and assembled as shown in FIG. In addition, a pile head reinforcement structure is installed.

The lower steel pipe 12 includes a first shaft 121 having a predetermined length, a front bit 122 having bit protrusions 122a joined to the front end of the first shaft 121 and distributed on a plurality of surfaces, A lower coupling stopper 123 provided at a predetermined interval on the outer circumferential surface of the upper end of the first shaft 121 and a plurality of helical pressure plates 124 joined to the lower side of the first shaft 121.

In the present embodiment, the first shaft 121 has a diameter of 180 to 250 mm, a medium diameter, and a length of 6 m, but the present invention is not limited thereto. The tip bit 122 has a convex spherical shape in order to maximize the tip end support force of the steel pipe pile after the construction, and a bit for reducing the penetration resistance is generated on the surface of the spherical portion by causing turbulence at the tip at the time of rotation- And has a projection 122a. The lower coupling stopper 123 is disposed around the first shaft 121 by two to four in this embodiment and welded thereto. The helix pressure plate 124 has a helical structure rotated by 360 degrees to induce intrusion into the ground during rotation of the steel pipe pile. The outer diameter of the helical pressure plate 124 is preferably about twice the outer diameter of the first shaft 121. The helix pressure plate 124 may have a shape with an end inclined or a radius reduced to reduce penetration resistance.

The upper steel pipe 14 has a second shaft 141 having a predetermined length and a diameter equal to that of the first shaft 121 and a second shaft 141 joined to the lower end of the second shaft 141 to transmit rotational force to the lower coupling stopper 123 And a sleeve stopper 143 fixed to an intermediate portion of the second shaft 141. The upper stopper 143 and the upper stopper 143 are disposed in the middle of the second shaft 141,

In this embodiment, the length of the second shaft 141 is the same as the length of the first shaft 121. The upper coupling 142 is welded to the lower end of the second shaft 141 in a cylindrical shape and is provided on the inner surface thereof with the same number of engagement protrusions 142a that are coupled to the lower coupling stopper 123. At this time, the stopping jaw 142a is substantially in an inverted T-shaped structure and is engaged and released by the lower coupling stopper 123 in an inclined plane along the rotating direction of the upper steel pipe 14. [ The sleeve stopper 143 is a means for pressing the buckling preventing sleeve 16 when rotating the steel pipe pile. The sleeve stopper 143 is welded to the second shaft 141 by a cylindrical structure having a relatively short length as compared with the outer diameter. Therefore, the position for pressing the buckling preventing sleeve 16 is determined according to the fixing position of the sleeve stopper 143. [

The buckling preventing sleeve 16 is inserted into the second shaft 141 of the upper steel pipe 14 in a freely rotatable manner and then stopped by the sleeve stopper 143 to prevent the steel pipe pile from being raised during rotation, To be forced into the stratum. 2, the buckling preventing sleeve 16 is made of a steel material. The buckling preventing sleeve 16 has a cylindrical boss portion 161 having an inner diameter equal to the outer diameter of the second shaft 141 and a plurality of plate type sleeve blades 162 arranged radially around the outer circumferential surface of the cylindrical boss portion 161. [ . In the present embodiment, four sleeve blades 162 are provided at intervals of 90 degrees, but may be selected from about three to six.

The buckling preventing sleeve 16 prevents the pivoting of the steel pipe pile at the upper portion when the helix steel pipe pile is rotated by the sleeve wing 162 and gives straightness to the penetration direction. In addition, the buckling preventing sleeve 16 penetrates into the stratum after penetration of the steel pipe pile and functions as a point to prevent buckling.

On the other hand, if the penetration depth of the steel pipe pile 10 is increased to 12 m or more in the present embodiment, an intermediate steel pipe 18 may be further provided as shown in FIG.

The intermediate steel pipe 18 has a third shaft 181 having a predetermined length and a diameter equal to that of the first shaft 121 and a second shaft 181 joined to the lower end of the third shaft 181 to transmit rotational force to the lower coupling stopper 123 And an intermediate coupling stopper 183 disposed at a predetermined interval on the outer circumferential surface of the upper end of the third shaft 181.

In the present embodiment, the middle steel pipe 18 is made to have the same length as the lower steel pipe 12 or the upper steel pipe 14. [ The middle coupling 182 has the same structure as the upper coupling 142.

In order to increase the bearing capacity of the steel pipe pile 10 in the present invention, a helical pressure plate 144 may be further provided on the second shaft 141 of the upper steel pipe 14 as shown in FIG. In order to increase the bearing capacity of the steel pipe pile 10, a helical pressure plate 184 may be further provided on the third shaft 181 of the intermediate steel pipe 18 as shown in FIG.

The head reinforcement for receiving the load of the building after rotation of the steel pipe pile 10 is made of a pair of inner and outer perforated steel plates 21 and 22 which are circumferentially arranged and supported on the head of the upper pile of the upper steel pipe 14 . The inner and outer perforated steel plates 21 and 22 have stepped portions 212 and 222 bent at an angle to each other so that portions except for the joining section have constant intervals G1 and G2. Also, the inner and outer perforated steel plates 21 and 22 are connected to one or more band bars 23. At this time, the pair of perforated steel plates 21 and 22 are partially cut and then bent inward and outward, respectively, so that the perforations 211 and 221 and the plurality of synthetic projections 21a and 22a are formed. At this time, the outer perforated signboard 22 is provided with a downwardly bent steel plate jaw 22b to be supported at the upper end of the steel pipe pile 10. [

Preferably, the lower end of the upper steel pipe 14 is further provided with a quick-fill plugging plate 15 having an air hole 15a for filling the concrete synthetic pile.

A construction method using the steel pipe pile 10 constructed as above will be described.

First, as shown in (A) of FIG. 6, the lower steel pipe 12 to which the tip bit 122 is attached is rotated and penetrated into the ground at a predetermined depth. The rotational penetration can be achieved, for example, by providing a rotary driver at the end of the bar of the excavator.

At this time, the helix pressure plate 124 induces rotation intrusion of the steel pipe pile. Also, the bit protrusion 122a formed on the leading bit 122 rotates, causing soil erosion at the leading end, thereby reducing the penetration resistance of the steel pipe pile.

6 (B), an upper steel pipe 14 provided with a fastening preventing plate 15 at the lower end and a sleeve 16 for preventing buckling in the middle is connected to the lower steel pipe 12 And then the lower steel pipe 12 and the upper steel pipe 14 are integrally rotated so as to penetrate the buckling preventing sleeve 16 into the ground layer.

At this time, the buckling preventing sleeve 16 is forcibly introduced into the layer by receiving the pressing force of the downward movement of the sleeve stopper 143 due to the rotation penetration of the upper steel pipe 14. At this time, since a plurality of sleeve blades 162 formed on the buckling preventing sleeve 16 are radially disposed and oriented in the axial direction, the straight pipe penetration of the steel pipe pile is induced and at the same time, the shaking in the radial direction is prevented.

6 (c), a pair of inner and outer perforated steel plates 21 and 22 are installed on the head of the head of the upper steel pipe 14 for reinforcement, and then the steel bar 23 is connected Head to head reinforcement is performed.

Subsequently, after putting the abandoned concrete in the ground where the steel pipe pile 10 is penetrated, the foundation steel is laid and the inner filling mortar 30 is filled in the upper part of the upper steel pipe 14 at the time of floor construction .

At this time, the inner filling mortar 30 is not only synthesized with the synthetic projections 21a and 22a but also filled in the holes 211 and 221 of the inner and outer perforated steel plates 21 and 22, so that the shear key function is exerted.

In the case where the steel pipe pile is deeply penetrated, that is, when the steel pipe pile is to be installed at a long depth, one or more middle steel pipes 18 are connected to the middle pipe 182 through the intermediate coupling 182 And the rotation of the upper steel pipe 14 is intruded into the final stage.

The present method of construction is a non-plaster drilling method in which a steel pipe pile 10 having a helical structure attached to a steel pipe is directly rotated and press-fitted into a required support layer, The soil is disturbed and the penetration resistance is decreased.

In addition, the helical pressure plates 124 and 144 can improve the tip end supporting force and increase the resistance against compression and tensile force.

In addition, when the steel pipe pile 10 is installed at a long depth, a point for suppressing the force moment is exerted at the position where the buckling preventing sleeve 16 is inserted, effectively preventing the lateral buckling, The uppermost upper steel pipe 14 is constructed of a synthetic pile to increase the strength and compressive force.

Thus, according to the present invention, it is possible to construct a pile having a good vertical penetration by satisfying the vertical degree (inclination prevention) by inhibiting lateral buckling.

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. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

12: Lower steel pipe
122: Lead bit
123: Lower coupling stopper
124: Helix platen
14: Upper steel pipe
143: Sleeve stopper
15: Burying clog plate
16: Sleeve for preventing buckling
18: Middle steel pipe
182: intermediate coupling
183: Intermediate coupling stopper
184: Helix platen
21, 22: inner and outer perforated steel plates

Claims

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(a) a first shaft 121 having a lower coupling stopper 123 at its upper end, a tip bit 122 (not shown) having bit protrusions 122a joined to the tip of the first shaft 121 and distributed over a plurality of surfaces, A step of rotating the lower steel pipe 12 made of a helical pressure plate 124 bonded to the lower side of the first shaft 121 into the ground at a predetermined depth;
(b) a second shaft 141 having the same diameter as the first shaft 121 and having a helical pressure plate 144, a sleeve stopper 143 fixed to an intermediate portion of the second shaft 141, An upper coupling 142 having an inverted T-shaped engaging step 142a for transmitting a rotational force to the lower coupling stopper 123 and a fast-blocking plate 15 having an air hole 15a at the lower end for the concrete composite pile And the upper steel pipe 14 provided with the buckling preventing sleeve 16 in the middle are connected to the upper end of the lower steel pipe 12 through the upper coupling 142 and then the lower steel pipe 12 and the upper steel pipe 14 Thereby integrally rotating the sleeve 16 so that the buckling preventing sleeve 16 is buried in the stratum;
(c) installing a pair of outer and inner perforated steel plates (21, 22) for reinforcement on the head of the upper steel pipe (14), connecting the steel bar (23) to reinforce the head of the head;
(d) placing the abandoned concrete on the ground in which the steel pipe pile is penetrated, then placing the foundation steel and filling the inner filling mortar 30 into the upper part of the upper steel pipe 14, A Method of Construction of Helix Steel Pipe Pile for Buckling Reinforcement.

10. The method of claim 9,
If the intrusion of the steel pipe pile is deep,
A third shaft 181 having the same diameter as the first shaft 121 and having a helical pressure plate 184 before the upper steel pipe 14 is connected after the step (a), a third shaft 181 having a lower end of the third shaft 181 An intermediate coupling stopper 183 provided at a predetermined interval on the outer peripheral surface of the upper end of the third shaft 181, Is inserted through at least one intermediate pipe (182), and then rotational penetration of the upper pipe (14) is performed through the final end of the pipe. The buckling reinforcing steel pipe Construction method of pile.