KR101467142B1 - Pressure grouting enabled steel pipe pile and penetration device of the same and pile construction method using the same - Google Patents

Abstract

Provided are a steel pipe pile for pressure grouting, which enables simultaneous penetration and pressure grouting and obtains skin friction force through the entire section of the steel pipe pile; a penetration device thereof; and a construction method of a pile using the same. The steel pipe pile for pressure grouting and the penetration device thereof according to an embodiment of the present invention comprise: a head assembly which is connected to the output end of a drive head driven by hydraulic pressure; and a steel pipe pile for rotation which is connected to the head assembly and penetrates the ground through rotation by receiving rotation force. The steel pipe pile for rotation comprises a lower steel pipe pile, a hollow screw shaft, and an upper steel pipe pile.

Description

TECHNICAL FIELD [0001] The present invention relates to a steel pipe pile capable of pressurized grouting, a penetration apparatus thereof, and a method of constructing a pile using the steel pipe pile and penetration apparatus,

The present invention relates to a steel pipe pile used for foundation work of a civil engineering structure, a penetration apparatus thereof, and a method of constructing a pile using the steel pipe pile. Particularly, it is possible to perform pressure grouting simultaneously with penetration of a steel pipe pile, The present invention also relates to a method of constructing a steel pipe pile, a penetration apparatus, and a method of constructing a pile using the same.

In general, steel pipe piles are constructed to secure the bearing capacity of large structures or bridges constructed on soft grounds, and they are also applied to soil erosion works, buoyancy anchor works, building foundation works, and slope reinforcement works. That is, the steel pipe pile is struck in the ground and pressured to a certain depth, thereby playing a role of supporting structural stability and soil pressure against the ground of the construction building.

As a conventional method of installing such a steel pipe pile in the ground, there is a method of drilling a predetermined depth in a desired ground with a driver by using a pile driver (file driver), installing the pile from the upper end and installing it in the ground, There is a method in which a steel pipe pile is directly rotated on a desired ground without piercing it.

In case of applying the method of turning the steel pipe pile directly by turning it like the latter, the bottom end of the steel pipe pile has a helical wing. Therefore, when the steel pipe pile is rotated forward, the steel pipe pile is inserted by the forward movement of the helical wing. In addition, in order to pull out the inserted steel pipe pile, if the steel pile is rotated in the reverse direction, the steel pipe pile is pulled out by the retraction movement of the spiral wing.

In order to rotate a steel pipe pile having a helical wing, a rotational force must be supplied from an actuator, and a structure connected to the rotational axis of the actuator and a structure in which the rotating shaft and the steel pipe pile are separated after the drawing of the steel pipe pile. In order to insert, pull out and separate the spiral steel pipe pile, an intermediate means having a connecting and separating function is required between the rotating shaft of the actuator and the spiral steel pipe pile.

On the other hand, in the case of a steel pipe pile having a helical wing, the tip end holding force is obtained by the helical wing. In addition, grouting must be performed in order to increase the frictional force of the main surface and strengthen the surrounding ground. The grouting can be carried out after the penetration of the steel pipe pile or simultaneously with the intrusion. Regardless of which method is chosen, grouting should be performed effectively around the spiral wing in order to see the effect of grouting, preferably over the entire length of the steel pipe pile. For this purpose, the pressurizing effect of the grouting should occur and there should be no leakage of the grout during pressurization.

As a background of the present invention, Korean Patent Registration No. 10-1144312, 'Steel Pipe Pile Extension Apparatus and Steel Pipe Pile Construction Method Using Same' has been proposed. A first step of mounting a tip enlargement plate having a toothed edge on the outer circumferential surface of the first steel pipe pile tip in the form of a hollow tube; A second step of rotationally pressing the first steel pipe pile into the ground to penetrate the steel pipe pile while enlarging the steel pipe from the surface to a predetermined depth; A third step of pulling the auger into the first steel pipe pile and rotating the same to perform a heavy excavation; A fourth step of coupling the second steel pipe pile to the upper end of the penetrated first steel pipe pile; A fifth step of rotationally pressing the first and second steel pipe piles and penetrating the tip of the steel pipe to a predetermined depth of the ground while excavating the steel pipe with an auger; A sixth step of injecting mortar from a front end portion of the ground penetration expanded by the first and second steel pipe piles to a predetermined height; A seventh step of filling the grooves of the first and second steel pipe piles and curing them to form a pile structure; And an eighth step of arranging the head of the structure.

 The above background art has an advantage of eliminating construction pollution such as noise and vibration caused by hammers, but it is a method of simply injecting the grout rather than a method of pressurizing it. Therefore, there is a limit to increase the quality of the construction, The effect of grouting can not be seen.

Korean Registered Patent No. 10-0550359 (Ground Reinforcement Method Using Steel Pipe and PC Pile) Korean Patent Laid-Open Publication No. 10-2013-0076070 (Steel pipe sockets and method for connecting steel pipe piles to steel pipe columns using the steel pipe sockets)

It is an object of the present invention to provide a steel pipe pile capable of pressure grouting simultaneously with penetration and capable of pressurized grouting so as to obtain a frictional force over the whole length of a steel pipe pile, a penetration apparatus thereof, and a method of constructing a pile using the same. .

According to a preferred embodiment of the present invention, a steel pipe pile capable of press grouting and a penetration apparatus thereof,
A head assembly connected to an output end of the hydraulically driven drive head;
And a rotating steel pipe pile connected to the head assembly for receiving rotational force and rotatingly penetrated into the ground;

The rotating steel pipe pile,
A spiral blade provided at one or more positions on the outer circumferential surface of the lower tube, and a grout discharge device formed near the spiral blade and formed through the lower tube, wherein the lower tube is a hollow tube having a predetermined length, A lower steel pipe pile having a first polygonal nut joined to a rear end of the lower pipe;

A second threaded hollow screw shaft having one end threadedly engaged with the screw hole of the first polygonal nut and the other end exposed to the outside of the lower tubular body to a predetermined extent;

An upper pipe body having the same outer diameter and inner diameter as the lower pipe body, and upper and lower steel pipe piles having second and third polygonal nuts respectively joined to the front and rear ends of the upper pipe body;

Wherein the first to third polygonal nuts have the same cross-sectional shape and size, and the second and third polygonal nuts have screw holes of the same diameter that can be screwed to the second-stage connection hollow screw shaft;
The head assembly includes:
A swivel having a grout injection port and coupled to the adapter, the swivel being connected to the rotation output end of the drive head, the swivel connected to the swivel, the swivel being integrally rotated with the adapter independently of the swivel, A drive socket having a polygonal hole for engagement opened downward to be polygonal with the same cross-section as the polygonal nut, and a pad hole located inside the polygonal hole for coupling the drive socket and communicating with the grout injection port, And a backflow prevention pad for preventing backflow when the grout is injected tightly.

Further, the apparatus further includes a hollow screw shaft for connection to the third stage and a steel pipe pile for expansion, which are further assembled to the upper steel pipe pile;

The steel pipe pile for capacity addition,

And a fourth and a fifth polygonal nut which are respectively joined to the front end and the rear end of the tube for extension, and the fourth and fifth polygonal nuts have first to third polygonal angles, Wherein the fourth polygonal nut has the same cross-sectional shape and size as the nut, and the fourth polygonal nut has a screw hole threadably engaged with the second-

And a third part of the hollow screw shaft for connection is screwed to a third polygonal nut on the upper side of the upper tubular body and a part of the hollow screw shaft is screwed to a fourth polygonal nut on the lower side of the expansion pipe.

According to another preferred embodiment of the present invention, a steel pipe pile and a penetration apparatus thereof capable of pressurized grouting at the same time as penetration,
A head assembly connected to an output end of the hydraulically driven drive head;
And a rotating steel pipe pile connected to the head assembly for receiving rotational force and rotatingly penetrated into the ground;
The rotating steel pipe pile,

A spiral blade provided at one or more positions on the outer circumferential surface of the lower tube, and a grout discharge device formed near the spiral blade and formed through the lower tube, wherein the lower tube has a predetermined length, A lower steel pipe pile having a first polygonal nut joined to a rear end of the lower pipe;

An upper tubular body having the same outer diameter and inner diameter as the lower tubular body, and an upper steel pipe pile having a second end connecting hollow screw shaft and a third poly nut, each of which is connected to a front end and a rear end of the upper tubular body;

Wherein the first and third polygonal nuts have the same cross-sectional shape and size, the second-stage connection hollow screw shaft is screwed into the screw hole of the first polygonal nut;
The head assembly includes:
A swivel having a grout injection port and coupled to the adapter, the swivel being connected to the rotation output end of the drive head, the swivel connected to the swivel, the swivel being integrally rotated with the adapter independently of the swivel, A drive socket having a polygonal hole for engagement opened downward to be polygonal with the same cross-section as the polygonal nut, and a pad hole located inside the polygonal hole for coupling the drive socket and communicating with the grout injection port, And a backflow prevention pad for preventing backflow when the grout is injected tightly.

Further, the steel pipe pile further includes an additional steel pipe pile that is further assembled to the upper steel pipe pile;

The steel pipe pile for capacity addition,

And a fifth polygonal nut having a third end connecting hollow screw shaft and a fifth polygonal nut which are respectively joined to the front end and the rear end of the tube for extension and having the same outer diameter and inner diameter as the lower tubular body, And has a same cross-sectional shape and size as the third polygonal nut, and the third-stage connecting hollow screw shaft is screwed into the screw hole of the third polygonal nut.

Further, in order to prevent clogging of the grout discharging hole, the grout discharging hole is formed at one end of the spiral blade and the blocking block is located at one side of the grout discharging hole and is bonded to the lower tube.

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And a pile drawing pin for connecting the drive socket to the upper steel pipe pile in the event that drawing of the steel pipe pile for rotation is required, is further provided.

Meanwhile, a method of constructing a steel pipe pile and a pile using the penetration apparatus capable of pressurized grouting simultaneously with intrusion according to an embodiment of the present invention,

A step of coupling the lower steel pipe pile to the drive socket of the head assembly and rotating the lower steel pipe pile into the ground at the designated position while driving the drive head and injecting the grout through the grouting hole, ;

After the grout injection is stopped, the connection of the head assembly to the lower steel pipe pile is disconnected, and then the second hollow shaft for coupling is screwed to the upper first polygonal nut of the lower steel pipe pile;

The lower second polygonal nut of the upper steel pipe pile is screwed to the second screw thread of the hollow shaft for connection and then the drive socket of the head assembly is coupled to the upper third polygonal nut of the upper steel pipe pile, Placing the upper steel pipe pile on a ground while injecting grout into the injection port;

And a step of separating the drive socket of the head assembly from the upper side third polygonal nut of the upper steel pipe pile after stopping driving of the drive head and injection of the grout.

Further, when the intrusion of the steel pipe pile for rotation is further required,

The third stage connecting hollow screw shaft is screwed to the third polygonal nut on the upper side of the upper steel pipe pile and then the drive assembly of the head assembly is connected to the fifth polygonal nut on the upper side of the steel pipe pile for expansion, Placing the steel pipe piles for expansion in the ground while rotationally injecting the grout;

Also, according to another embodiment of the present invention, there is provided a method of constructing a steel pipe pile and a pile using the penetration apparatus,

A step of coupling the lower steel pipe pile to the drive socket of the head assembly and rotating the lower steel pipe pile into the ground at the designated position while driving the drive head and injecting the grout through the grouting hole, ;

After the grout injection is stopped, the connection with the head assembly is separated from the lower steel pipe pile, and the hollow screw shaft for connecting the second end of the upper steel pipe pile is screwed to the first polygonal nut at the upper side of the lower steel pipe pile to connect the upper steel pipe pile ;

Coupling a drive socket of the head assembly to a third polygonal nut on the upper side of the upper steel pipe pile and rotating the upper steel pipe pile on the ground while driving the drive head and injecting the grout through the grout injection port;

And stopping the drive of the drive head and the injection of the grout, and then separating the drive socket of the head assembly from the upper side third polygonal nut of the upper steel pipe pile.

Here, when the intrusion of the steel pipe pile for rotation is further required,

The lower end of the steel pipe pile for expansion is screwed to the third polygonal nut on the upper side of the upper steel pipe pile, and then the drive socket of the head assembly is coupled to the upper fifth polygonal nut of the steel pipe pile for expansion In this state, the operation of driving the drive head and the injection of the grout are carried out while rotating the steel pipe pile for expansion for rotation in the ground.

According to the steel pipe pile and its penetration apparatus capable of pressurized grouting according to the present invention and the method of constructing the pile using the pile, the joint between the single steel pipe pile is made by screwing and the joint surface is tightly tightened by the screw tightening force, The pressurization of the grout is maintained. In addition, backflow leakage of the grout from the head assembly side is prevented by the backflow prevention pad, and pressurized grouting becomes possible. In addition, since grouting is performed simultaneously with the rotation of the steel pipe pile, the frictional force of the steel pipe pile is increased, and the grouting effect is doubled since the entire length of the steel pipe pile is increased. Can be obtained.

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.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a configuration diagram of a steel pipe pile for rotation according to a first embodiment of the present invention. FIG.
1B is a sectional view taken along a line KK in Fig. 1A;
FIG. 2 is an enlarged cross-sectional view of a portion 'A' of FIG. 1a.
3 is a schematic view of a hollow screw shaft for three-stage connection and a steel pipe pile for expansion added to the first embodiment.
4 is a configuration diagram of a head assembly applied to the present invention.
Fig. 5A is a top view (rear end) side view of the head assembly of Fig. 4 and the steel pipe pile. Fig.
FIG. 5B is a cross-sectional view taken along line BB of FIG. 5A. FIG.
6 is a view showing an example of a construction method using a rotating steel pipe pile and a head assembly according to a first embodiment of the present invention.
7 is a structural view of a steel pipe pile for rotation according to a second embodiment of the present invention.
8 is a view showing an example of a construction method using the rotating steel pipe pile and the head assembly of Fig. 7;

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.

≪ Embodiment 1 >

As shown in FIG. 1A and FIG. 2, the rotating steel pipe pile 10 according to the first embodiment of the present invention includes a lower steel pipe pile 12, a second end connecting hollow screw shaft 14 and an upper steel pipe pile 16 It is basically equipped. In addition, as the depth of penetration increases, the third stage connection hollow screw shaft 20 and the steel pipe shaft 18 for expansion are further provided.

 The lower steel pipe pile 12 has a hollow body 121 having a predetermined length, a sharpened portion 122 formed to be sharp at the tip of the lower tube body 121 and a pointed portion 122 closed at one point on the outer peripheral surface of the lower tube body 121, A grout discharge hole 124 formed near the helical wings 123 and the helical wings 123 and formed through the lower tubular body 121 and a first polygonal nut 125 connected to the rear end of the lower tubular body 121, ). At this time, the outer diameter of the helical wing 123 is configured to be larger than the maximum width appearing in the cross-section of the first polygonal nut 125 and the rear polygonal nuts.

The second end connecting hollow screw shaft 14 is assembled such that one end thereof is screwed to the screw hole 125a of the first polygonal nut 125 and the other end is exposed to the outside of the lower tubular body 121 by a predetermined amount. At this time, the second-stage connection hollow screw shaft 14 has a male screw thread having a trapezoidal cross section or a rectangular cross section on the outer peripheral surface.

The upper steel pipe pile 16 includes a hollow upper tube body 161 having the same outer diameter and inner diameter as the lower tube body 121 and second and third polygonal nuts 161 and 162 joined to the front and rear ends of the upper tube body 161, 162, 163).

Here, the first to third polygonal nuts 125, 162, and 163 have the same cross-sectional shape and size, and the second and third polygonal nuts 162 and 163 can be screwed to the second- And has screw holes 162a and 163a of the same diameter. The threaded holes 162a and 163a have the same trapezoidal cross-section or square cross-sectional female thread formed on the inner peripheral surface of the second-stage connection hollow screw shaft 14.

The third-stage connection hollow screw shaft 20 used additionally has the same structure as the second-stage connection hollow screw shaft 14 described above.

As shown in FIG. 3, the steel pipe pile 18 for expansion is further screwed to the upper steel pipe pile 16 via the third screw shaft 20 for connection. The expansion pipe 18 has a pipe 181 for expansion having an outer diameter and an inner diameter equal to those of the lower pipe 121 and a fourth and a fifth polygonal nut 181 joined to the front and rear ends of the pipe 181 for extension, The fourth and fifth polygonal nuts 184 and 185 have the same sectional shape and size as those of the first through third polygonal nuts 125 and 162 and 163 and the fourth polygonal nut 184 has the same cross- And a screw hole 184a that is screwed into the screw hole 20a.

Here, the first to fifth polygonal nuts 125, 162, 163, 184, 185 have the same polygonal structure as the outer peripheral surfaces. Although the present embodiment shows a hexagonal structure, it may have various polygonal structures such as square, pentagonal, and octagonal.

4 and FIG. 5, the present invention can concurrently perform rotational penetration of the rotating steel pipe 10 and injection of grout by the head assembly 50. The head assembly 50 may be connected to a drive head 100 installed in a hydraulic heavy equipment such as an auger machine, a hover, or an excavator.

The head assembly 50 includes an adapter 52 that is integrally rotated with the rotation output end of the drive head 100 and a swivel 54 having a grout injection port 53 and coupled to the adapter 52 for rotation, And is rotatable integrally with the adapter 52 independently of the swivel 54 and has the same cross section as the first and third polygonal nuts 125 and 163 on the lower and upper steel pipe piles 12 and 16, A driving socket 56 having an engaging polygonal hole 56a opened to the lower side so as to be engaged with the driving socket 56 and a pad 56 located inside the engaging polygonal hole 56a of the drive socket 56 and communicating with the grouting hole 53, And a backflow preventing pad 58 which has a hole 58a and is brought into close contact with the joint surface to prevent backflow when grouting is performed.

The backflow preventing pad 58 may be made of rubber or silicon in a ring shape. The cross-section of the ring portion of the backflow prevention pad 58 may have a circular or rectangular cross section.

A pile pull pin 59 may be further provided to connect the drive socket 56 to the upper steel pipe pile 16 when the pile 10 is required to be pulled out. In the present embodiment, the pile drawing pins 59 are two in number as shown in Figs. 5A and 5B, and are arranged side by side through the pinhole 56b on the lower side of the drive socket 56. Fig. The pile pull pin 59 is engaged with the lower surface of the first polygonal nut 125 when the first polygonal nut 125 is coupled to the drive socket 56 and assembled to the pin hole 56b .

A construction method of the steel pipe pile 10 for rotation using the head assembly 50 thus constructed will be described with reference to FIG.

Penetration of lower steel pipe pile and grouting

First, after coupling the upper first polygonal nut 125 of the lower steel pipe pile 12 to the drive socket 56 of the head assembly 50 as shown in FIG. 1A, the drive of the drive head 100 and the grout The lower steel pipe pile 12 is rotated and penetrated into the ground at the designated position while the grout is injected through the injection port 53 in parallel.

At this time, the lower steel pipe pile 12 is penetrated by the helical wing 123 penetrating the ground, and the grout is discharged through the discharge hole 124 on the lower tube body 121 of FIG. At this time, even if the grout pressure in the lower tube body 121 increases, the backflow prevention pad 58 is in close contact with the upper surface of the first polygonal nut 125, so that there is no leakage and pressure grouting is possible.

For head assembly separation and second stage connection Hollow screw shaft  Assembly

After the grout injection is stopped, the connection with the head assembly 50 is separated from the lower steel pipe pile 12, and then the second stage connection hollow screw shaft 14 is inserted into the lower steel pipe pile 12 And screwed to the upper first polygonal nut 125.

Rotational penetration of the upper steel pipe pile

Next, the lower side second polygonal nut 162 of the upper steel pipe pile 16 is screwed to the second end connecting hollow screw shaft 14, and then the upper side third polygonal nut (not shown) of the upper steel pipe pile 16 163 to engage the drive socket 56 of the head assembly 50.

Then, the drive shaft 100 is driven and the grout is injected into the grouting hole 53, and the upper steel pipe pile 16 is rotated and penetrated into the ground. At this time, a screw tightening force is generated between the second polygonal nut (162) and the hollow shaft (14) for connection to the second stage when the upper steel pipe pile (16) Accordingly, the second polygonal nut 162 is in close contact with the first polygonal nut 125, and the leakage of the grout is prevented by the backflow prevention pad 58, so that the pressurized grouting is performed.

Stop grout injection and remove head assembly

After the driving of the drive head 100 and the injection of the grout are stopped, the drive socket 56 of the head assembly 50 is inserted into the upper steel pipe pile 16, Side third polygonal nut 163 of the upper side.

Meanwhile, in the present method, when the intrusion of the pivot shaft 10 is further required, the additional steel pipe pile 18 for expansion is further assembled.

That is, at the immediately preceding stage, the third-stage connecting screw shaft 20 for connection in FIG. 3 is screwed to the upper third-side polygonal nut 163 of the upper steel pipe pile 16, The drive socket 100 of the assembly 50 is coupled to the upper fifth polygonal nut 185 of the steel pipe pile 18 for expansion and the driving of the drive head 100 and the injection of the grout are performed in parallel, And the pile 18 is pierced through the ground. Therefore, construction of the steel pipe pile 10 for rotation is completed as in 6 (D).

As described above, according to the present invention, when the grout is injected together with the rotation of the steel pipe pile 10 for rotation, leak leakage is suppressed to the outside of the discharge hole 124, so that pressurized grouting becomes possible, .

Also, while grouting is performed after installation of a steel pipe pile as in the prior art, the present invention is advantageous in that the grouting effect is doubled because the steel pipe pile is formed over the entire length of the steel pipe pile.

≪ Embodiment 2 >

Meanwhile, in the present invention, the second stage connection hollow screw shaft 14a may be integrally formed with the upper steel pipe pile 16 as shown in FIG. 7 to constitute the steel pipe pile 10a for rotation. Needless to say, in the case of the steel pipe pile 18a for expansion to be used for increasing the depth of penetration, the third-stage hollow screw shaft 20a for connection is integrally formed. In the second embodiment, the lower steel pipe pile 12, which is the same as the first embodiment, is applied to the lower steel pipe pile.

Therefore, in the second embodiment, the elements constituting the steel pipe pile 10a for rotation correspond to the constituent elements of the first embodiment, and therefore, the same parts are denoted by the same reference numerals.

The upper steel pipe pile 16a of the second embodiment has a hollow upper pipe body 161 having the same outer diameter and inner diameter as the lower pipe body 121 of the lower steel pipe pile 12, And a third polygonal nut 163 for the second stage connection.

The first and third polygonal nuts 125 and 163 have the same cross sectional shape and size and the second end connecting hollow screw shaft 14a is screwed into the screw hole 125a of the first polygonal nut 125 have.

The additional steel pipe pile 18a to be additionally assembled to the upper steel pipe pile 16a includes a hollow expansion pipe 181 having the same outer diameter and inner diameter as the lower pipe pair 121 of the lower steel pipe pile 12, And a fifth polygonal nut 185 which is connected to the front end and the rear end of the first polygonal nut 181 and the third polygonal nut 185, And the third-stage connection hollow screw shaft 20a is screwed into the screw hole 163a of the third polygonal nut 163. The third-

The grout discharge hole 124 is formed at one end of the spiral blade 123 to prevent the grout discharge hole 124 from being blocked as shown in FIGS. 1A and 1B. The grout discharge hole 124 Blocking block 127 may be positioned on one side of the lower tubular body 121 and may be connected to the lower tubular body 121. Therefore, the grout discharge hole 124 is positioned between the end of the spiral blade 123 and the blocking block 127, and the grout discharge hole 124 can be inserted into the grout discharge hole 124 even during the penetration and withdrawal of the steel pipe 10 for rotation during grout injection. Clogging of the grooves is eliminated and grouting is improved.

The construction method of the steel pipe pile 10a for rotation of the second embodiment constructed as described above is carried out by using the above-described head assembly 50. [

8 (a), the upper first polygonal nut 125 of the lower steel pipe pile 12 is coupled to the drive socket 56 of the head assembly 50, and then the drive of the drive head 100 and the grout The lower steel pipe pile 12 is rotated and penetrated into the ground at the designated position while the grout is injected through the injection port 53 in parallel.

After the grout injection is stopped, the connection with the head assembly 50 is separated from the lower steel pipe pile 12, and then the second-stage connection screw shaft 14a for connecting the upper steel pipe pile 16a to the lower steel pipe pile 12 And the upper steel pipe pile 16a is connected thereto.

Next, as shown in FIG. 8 (B), the drive socket 56 of the head assembly 50 is coupled to the upper third polygonal nut 163 of the upper steel pipe pile 16a, The upper steel pipe pile 16a is rotationally penetrated into the ground while the grout is injected through the grout injection port 53 in parallel.

Finally, after the driving of the drive head 100 and the injection of the grout are stopped, the drive socket 56 of the head assembly 50 is separated from the upper side third polygonal nut 163 of the upper steel pipe pile 16a .

When the penetration of the pivot shaft 10a for rotation is further required, the lower end side hollow screw shaft 20a for connecting the lower end of the steel pipe pile 18a for expansion to the upper steel pipe pile (as shown in Fig. 8 And the drive socket 56 of the head assembly 50 is coupled to the upper fifth polygonal nut 185 of the steel pipe pile 18a for expansion after being screwed to the upper side third polygonal nut 163 The steel pipe pile 18a for extension is inserted into the ground while the driving of the drive head 100 and the injection of the grout are performed in parallel. Thus, the construction of the steel pipe pile 10a for rotation is completed as shown in FIG. 8 (D).

When the pile 10a for rotation is not vertically aligned or the pile is disturbed by the rock, the pile pull pin 59 is inserted into the pin hole 56b of the drive socket 56 on the side of the head assembly 50, The drive socket 56 may be rotated in the reverse direction to draw the pile of the rotating steel pipe. In this case, since the joints are welded at the time of connection of each steel pipe pile, the threaded portion is not loosened. In addition, the pile drawing pin 59 is not only penetrated when the grouting is injected but is repeatedly lifted up a little bit of the pile shaft 10a for rotation in the middle, and is also used to prevent separation from the head assembly 50 at this time.

As described above, in the case of the second embodiment, as well as the rotational penetration of the steel pipe pile 10a for rotation, leakage is suppressed to the outside of the discharge hole 124 when the grout is injected and pressure is generated, But also the whole length of the steel pipe pile, so that the advantage of doubling the grouting effect is obtained.

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 pile
14: Hollow screw shaft for connection of the second stage
16,16a: upper steel pipe pile
18,18a: Steel pipe piles for expansion
125, 162, 163, 184, 185:
50: head assembly
52: Adapter
54: Swivel
56: drive socket
58: Backflow prevention pad

Claims (11)

A head assembly (50) connected to an output end of a hydraulically driven drive head (100);
And a rotating steel pipe pile (10) connected to the head assembly (50) and receiving rotational force to be rotationally introduced into the ground;
The rotating steel pipe pile (10)
A sharp point 122 formed to be sharp at the tip of the lower tubular body 121 and a helical blade 123 provided at one or more positions on the outer circumferential surface of the lower tubular body 121. The lower tubular body 121 has a predetermined length, And a lower steel pipe pile (125) having a grout discharge hole (124) formed near the spiral wing (123) and formed through the lower pipe body (121) and a first polygonal nut (125) joined to the rear end of the lower pipe body 12);
A second threaded hollow screw shaft 14 having one end screwed into the screw hole 125a of the first polygonal nut 125 and the other end exposed to the outside of the lower tubular body 121 by a predetermined amount;
An upper tube body 161 having an outer diameter and an inner diameter equal to those of the lower tube body 121 and upper and lower steel tube piles 16 and 17 having second and third polygonal nuts 162 and 163 joined to the front and rear ends of the upper tube body 161, );
The first and second polygonal nuts (125, 162, 163) have the same cross-sectional shape and size, and the second and third polygonal nuts (162, 163) have the same diameter And has screw holes 162a and 163a of the screw holes 162a and 163a.
The head assembly (50)
An adapter 52 coupled to the rotation output end of the drive head 100 and integrally rotated; a swivel 54 having a grout injection port 53 and rotatably connected to the adapter; (56a) having a same cross section as the first polygonal nut (125) or the third polygonal nut (163) and integrally rotatable with the adapter (52) And a pad hole 58a communicating with the grout injection port 53. The drive socket 56 is disposed inside the polygonal hole 56a for coupling the drive socket 56 and is in close contact with the joint surface, And a backflow preventing pad (58) for preventing reverse flow. The steel pipe pile and the penetration apparatus thereof are capable of performing pressure grouting simultaneously with penetration. The method according to claim 1,
Further comprising a third screw shaft 20 for connection and a steel tube pile 18 for expansion to be further assembled to the upper steel pipe pile 16;
The expansion-use steel pipe pile (18)
And a fourth and a fifth polygonal nuts 184 and 185 bonded to the front and rear ends of the tube body 181 for expansion, respectively. The fourth and fifth polygonal nuts 184 and 185 have the same outer diameter and inner diameter as the lower tube body 121, And fifth polygonal nuts 184 and 185 have the same sectional shape and size as those of the first through third polygonal nuts 125 and 162 and 163 and the fourth polygonal nut 184 is screwed to the second- Has a screw hole 184a,
A third part of the hollow screw shaft 20 for connection is partly screwed to the upper side third polygonal nut 163 of the upper tube body 161 and the other end is screwed to the lower side fourth Wherein the pipe is threadedly engaged with the polygonal nut (184). A head assembly (50) connected to an output end of a hydraulically driven drive head (100);
And a rotating steel pipe pile (10) connected to the head assembly (50) and receiving rotational force to be rotationally introduced into the ground;
The rotating steel pipe pile (10)
A sharp point 122 formed to be sharp at the tip of the lower tubular body 121 and a helical blade 123 provided at one or more positions on the outer circumferential surface of the lower tubular body 121. The lower tubular body 121 has a predetermined length, And a lower steel tube pile 12 having a grout discharge hole 124 formed near the spiral blade and penetrating the lower tube 121 and a first polygonal nut 125 connected to a rear end of the lower tube 121, ;
An upper tubular body 161 having an outer diameter and an inner diameter equal to those of the lower tubular body 121 and a second tubular connecting hollow screw shaft 14a and a third poly nut 163) of the upper steel pipe pile (16a);
The first and third polygonal nuts 125 and 163 have the same cross-sectional shape and size, and the second-stage connection hollow screw shaft 14a is screwed into the screw hole 125a of the first polygonal nut 125;
The head assembly (50)
An adapter 52 coupled to the rotation output end of the drive head 100 and integrally rotated; a swivel 54 having a grout injection port 53 and rotatably connected to the adapter; (56a) having a same cross section as the first polygonal nut (125) or the third polygonal nut (163) and integrally rotatable with the adapter (52) And a pad hole 58a communicating with the grout injection port 53. The drive socket 56 is disposed inside the polygonal hole 56a for coupling the drive socket 56 and is in close contact with the joint surface, And a backflow preventing pad (58) for preventing reverse flow. The steel pipe pile and the penetration apparatus thereof are capable of performing pressure grouting simultaneously with penetration. The method of claim 3,
Further comprising a steel pipe pile (18a) for expansion which is further assembled to the upper steel pipe pile (16);
The steel pipe pile (18a)
A tube joint 181 for expansion having an outer diameter and an inner diameter equal to those of the lower tube 121, a third screw joint hollow shaft 20a for connection at the front and rear ends of the extension tube 181, And the fifth polygonal nut 185 has the same cross-sectional shape and size as the first and third polygonal nuts 125 and 163 and the third-stage hollow screw shaft 20a for connection has a third polygonal nut Is screwed into a screw hole (163a) of the pipe (163). The method according to claim 1 or 3,
In order to prevent clogging of the grout discharging hole 124, the grout discharging hole 124 is formed at one end of the spiral blade 123 and the blocking block 127 is located at one side of the grout discharging hole 124 And the lower tube body (121). The steel pipe pile and the penetration apparatus thereof are capable of performing pressure grouting simultaneously with the intrusion. delete The method according to claim 1 or 3,
And a pile drawing pin (59) for connecting the drive socket (56) to the upper steel pipe pile (16 or 16a) in the event that drawing of the steel pipe pile for rotation is required, And its intrusion device. After coupling the upper first polygonal nut 125 of the lower steel pipe pile 12 to the drive socket 56 of the head assembly 50 and driving the drive head 100 and injecting the grout through the grout injection port 53 Placing the lower steel pipe pile 12 in the ground at a designated location while rotating the steel pipe pile 12 in rotation;
After the grout injection is stopped, the connection with the head assembly 50 is separated from the lower steel pipe pile 12, and then the second end connecting hollow screw shaft 14 is inserted into the upper side first polygonal nut 125);
The lower second polygonal nut 162 of the upper steel pipe pile 16 is screwed to the second screw shaft 14 for connection and then the upper polygonal nut 163 of the upper steel pipe pile 16 Engaging the drive socket 56 of the head assembly 50 and driving the drive head 100 and injecting the grout into the grout injection port 53 while rotating the upper steel pipe pile 18 into the ground;
Disengaging the drive socket 56 of the head assembly 50 from the upper side third polygonal nut 163 of the upper steel pipe pile 16 after stopping the drive of the drive head 100 and the injection of the grout And a method of constructing the pile using the penetration apparatus. 9. The method of claim 8,
If further penetration of the steel pipe pile is required,
The third stage connecting hollow screw shaft 14 is screwed to the upper side third polygonal nut 163 of the upper steel pipe pile 16 and then the drive socket 56 of the head assembly 50 is inserted into the steel pipe pile Placing the steel pipe piles 18 for expansion on the ground while rotationally driving the drive head 100 and injecting the grout in a state of being coupled to the upper fifth polygonal nut 185 of the upper side And a method of constructing a pile using a steel pipe pile capable of pressurized grouting and a penetration apparatus thereof. After coupling the upper first polygonal nut 125 of the lower steel pipe pile 12 to the drive socket 56 of the head assembly 50 and driving the drive head 100 and injecting the grout through the grout injection port 53 Placing the lower steel pipe pile 12 in the ground at a designated location while rotating the steel pipe pile 12 in rotation;
The grout injection is stopped and then the connection with the head assembly 50 is separated from the lower steel pipe pile 12 and then the second end connecting hollow screw shaft 14a of the upper steel pipe pile 16a is inserted into the lower steel pipe pile 12 Connecting the upper steel pipe pile (16a) by screwing the steel pipe to the upper first polygonal nut (125);
The drive socket 56 of the head assembly 50 is coupled to the upper third polygonal nut 163 of the upper steel pipe pile 16a and the driving of the drive head 100 and the injection of the grout through the grout inlet 53 And rotating the upper steel pipe pile (16a) in the ground while rotating the upper steel pipe pile (16a) in parallel;
Disengaging the drive socket 56 of the head assembly 50 from the upper side third polygonal nut 163 of the upper steel pipe pile 16a after the driving of the drive head 100 and the injection of the grout are stopped And a method of constructing the pile using the penetration apparatus. 11. The method of claim 10,
If further penetration of the steel pipe pile is required,
The lower end side hollow threaded shaft 20a for connecting the lower end side of the expansion pipe tube 18a is screwed to the upper side third polyhedron nut 163 of the upper steel pipe pile 16a and then the drive of the head assembly 50 The steel pipe pile 18a for expansion is connected to the upper fifth polygonal nut 185 of the expansion steel pipe 18a while driving the drive head 100 and injecting the grout. And a step of rotating the pile on the ground. The pile of claim 1, wherein the pile is made of steel.

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