KR101700848B1 - Auger pile - Google Patents

Abstract

The present invention relates to an auger pile. A forward helix to cut with a drilling head and a cutting blade is disposed on a lower end of a first auger pile, and a reverse helix for stirring is disposed on an upper portion of a forward helix for cutting. A reverse helix for stirring is disposed on a second auger pile connected to an upper end of the first auger pile to inject cement milk in a pipe insertion step by drilling and cutting the ground to sufficiently stir cut ground soil, and the injected cement milk to complete construction by simply performing a head cleaning step and a dynamic loading test step when the stirred ground soil and cement milk are hardened without performing a separate grouting step after pipe insertion is completed; thereby construction time being able to be shortened by half.

Description

Auger pile}

More particularly, the present invention relates to auger file, and more particularly, to a cutting forward helix provided at the lower end and a reverse helix for stirring at the upper portion of the cutting forward helical, so that when the forward helical is rotated, And the grouting step for grouting by injecting the cement milk for grouting at the same time as the ground cutting step is performed at the same time as the agitation of the soil slurry by the reverse helix for stirring is performed at the same time so that the air can be cut in half will be.

In general, piles are introduced into the ground in the construction of a foundation supporting the load of a building or a civil structure. In the past, a method of striking a file by striking it and a method of press- Has been used.

However, as the conventional striking method and press-fitting method are pointed out to safety problems and environmental problems due to noise and vibration during construction, rotational indentation methods have been developed and used.

In the rotary indentation method, a helical anchor pile is used. The helical file includes a helical file body in the form of a pipe and a plurality of helixes formed on the outer circumferential surface of the helical file body.

In addition, the helical file body is coupled to a hydraulic rotary device installed at the front end of a boom of a backhoe, without using a large equipment such as an auger drill machine.

Therefore, the height of the equipment for rotating the helical file can not be increased indefinitely, so that the length of the helical file is set to about 3 m. If the required penetration depth is deeper than the helical file, one or more shafts Anchor file (a simple pipe-type file without helix) is connected and intruded.

A typical helical file construction method is performed through a helical file penetration step, a shaft file connection and penetration step, a grouting step, a head part cleaning step, and a dynamic test step. It is possible to shorten the air to 250m / day by the integrated construction of the pile. It is excellent in the construction quality, and it is possible to improve the stability of the construction and the environment by the non-dusting, In addition to advantages such as civil appeal and dispute settlement, it is possible to minimize the disturbance of ground during construction of soft ground, so that it is possible to construct even at an inclined angle.

However, the conventional helical file construction method has various problems.

First, the tip of the helical file body of the helical file is sloped or the conical head with the bottom is joined to facilitate digging into the ground. However, if it is necessary to pass through the rock during the construction process, There is a problem that this becomes impossible.

Second, helical file body and shaft anchor file of helical file use the same diameter pie. To connect helical file and shaft anchor file, connect the top of helical file body and the connecting sleeve at the bottom of shaft anchor file. When connecting several shaft anchor piles, it is necessary to connect the shaft anchor pile to the shaft anchor pile. In order to connect the shaft anchor pile to the shaft anchor pile, The connecting sleeve is inserted into the lower end of the shaft anchor pile and the connecting pin is inserted through the connecting sleeve and the upper and lower shaft anchor piles so that when the large torque is applied at the time of construction, There is a problem that the connection part of the anchor pile is damaged and construction is delayed.

Therefore, it is possible to construct even when it is necessary to pass through the rock bed during construction, to minimize the boring load and to prevent the large torque from being applied, and to develop the technology that enables construction with a small hydraulic rotary device .

As a prior art in response to such a demand, Korean Patent No. 1552139 (registered as 2015.09.04) "helical file" (hereinafter referred to as "prior art") is disclosed.

The above prior art can minimize the resistance of the cut soil when penetrating into the ground by forming cutouts in the outer periphery of a plurality of helixes provided in the helical file and improve the cutting performance of the ground by providing cutting edges at the cut- , A crushing crown having an outer circumferential cutting tip made of a material having excellent cutting power at the lower end of the helical file and a crushing crown having a cutting tip at the lower end is pierced so that the crushing crown can perforate the ground before the ground cutting by the helix, It is possible to construct even when the rock is to be passed through the rock during construction, and it is possible to reduce the burden on the cutting of the helix, so that the construction of the helical pile can be performed more quickly, It is possible to construct even with a rotating device, thereby enabling economical construction.

However, in the prior art, the inner diameter of the cutting hole of the ground formed by the helix becomes equal to the outer diameter of the helix, so that the helix is cut and penetrated by the helix, It is difficult to simultaneously perform the cutting and penetration step and the cement milk injection for grouting because the helix interferes with the downward flow of the cement milk and the cutting soil and the cement milk are not sufficiently stirred. The ground is completely cut and the grouting step is started after the helical anchor pile is completely penetrated. Therefore, there is a problem that the entire air is lengthened as the ground cutting step and the grouting step are sequentially performed.

Therefore, it is required to develop a technique for shortening the overall air by simultaneously performing the ground cutting step and the grouting step.

Korea Registered Patent No. 1552139 (Registered on April 5, 2014) "Helical Anchor File"

Therefore, the object of the present invention is to provide a cutting machine, which comprises a cutting forward helix and a reverse helix for cutting on the cutting forward helix, the cutting by the forward helix for cutting and the cutting by the reverse helix for stirring It is an object of the present invention to provide an auger file in which air can be cut in half by simultaneously performing agitation of ground soil and grouting by grouting by injecting cement milk for grouting simultaneously with the ground cutting step.

According to an aspect of the present invention, there is provided a first auger file including a first auger file assembled at the first stage and a second auger file connected to a first auger file, A forward auger for cutting coupled to the lower end of the first auger main body and a reverse helix for agitation coupled from above the forward helix for cutting to near the top of the first auger main body, Wherein the cutting forward helix is constituted by a right-handed spiral of one revolution and a cutting edge is formed at a lower end thereof, the reverse helix for stirring is constituted by a plurality of turns of left spiral, and the lower end of the first auger main body is inclined Wherein the second auger file has a circular hole having a diameter equal to that of the first auger main body, Wherein the pitch of the forward helix for cutting of the first auger file is larger than the pitch of the forward auger for stirring of the first auger file, Wherein the outer helix of the agitating reverse helix for agitating the first auger and the agitating reverse helix for agitating the second auger is smaller than the pitch of the reverse helix for agitating the first auger and the second ager, And the outer diameter of the forward helical gear is smaller than the inner diameter of the ground hole formed by the forward helical gear for cutting.

According to the auger file of the present invention, a cutting forward helix having a cutting edge together with a perforation head is provided at the lower end of the first auger file, and a reverse helix for stirring is provided at an upper portion thereof. The second auger file is equipped with an inverted helix for stirring, so that the ground soil and the cement milk injected by injecting the cement milk at the penetration step by penetration and cutting of the ground are sufficiently agitated and the penetration is completed and then a separate grouting step is performed If the cement mortar with cemented soil slurry is cured, the construction can be completed by simply passing the head cleaning step and the docking test step, so that the air can be shortened to about half.

1 to 3 show a preferred embodiment of the present invention,
1 is a perspective view showing a first auger file and a second auger file,
2 is a left side view showing a first auger file and a second auger file,
3 is an exploded perspective view of a first auger file and a second auger file.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an auger file according to the present invention will be described in detail with reference to the preferred embodiments illustrated in the accompanying drawings.

The auger file according to the present embodiment includes a first auger file 100 assembled at the first stage and a second auger file 200 connected to the first auger file 100.

The first auger file 100 includes a first auger main body 110 formed of a circular pipe, a cutting forward helix 120 coupled to a lower end of the first auger main body 110, And an agitating reverse helix (130) coupled from above the helix (120) to near the upper end of the first auger main body (110).

The cutting forward helix 120 is composed of a spiral of one revolution (right spiral in the drawing) and a cutting edge 121 is formed at the bottom.

The agitating reverse helix 130 is composed of a plurality of turns (8.5 turns in the drawing) of helixes (left helix in the drawing).

The pitch P1 of the cutting forward helix 120 is preferably smaller than the pitch P2 of the backward helix 130 for stirring.

That is, by making the pitch P1 of the forward helix 120 for cutting smaller than the pitch P2 of the backward helix 130 for stirring, cutting performance by the forward helix 120 for cutting is improved, The agitating performance by the agitating reverse helix 130 which stirs up the ground soil slurry that has been cut by increasing the pitch P2 of the reverse helix 130 to be larger than the pitch P1 of the cutting forward helix 120 Is improved.

A coupling head 140 for coupling to a hydraulic rotary device (not shown) or a second auger file 200 is coupled to the upper end of the first auger main body 110.

The connection head 140 is formed of a circular pipe having an inner diameter corresponding to the outer diameter of the first auger main body 110 and includes a plurality of connection pin holes 141 for fitting the connection pin 150, .

The connection pin 150 may include a pin having a head larger than the inner diameter of the connection pin hole 141 and a split pin for preventing the pin from being separated from the connection pin hole 141 at random. A connecting bolt 151 passing through the pin hole 141 and a connecting nut 152 fastened to the protruding end of the connecting bolt 151.

The lower end of the first auger main body 110 is provided with a perforated head 160 cut obliquely and having a sharp tip. The cutting angle of the piercing head 160 is preferably about 45 degrees.

The second auger file 200 includes a second auger main body 210 formed of a circular pipe and an agitating reverse helix 230 coupled to an outer peripheral surface of the second auger main body 210.

The second auger main body 210 is formed of a circular pipe having the same diameter as that of the first auger main body 110.

A connection pin hole 220 for connecting to the connection head 140 of the first auger file 100 is formed at the lower end of the second auger file main body 210.

The agitating reverse helix 230 is formed in the same shape as the agitating reverse helix 130 of the first auger 100.

A connecting head 240 for connecting the lower end of the first auger 10 to the upper end of the second auger main body 210 or the hydraulic rotating device (not shown) is coupled.

The connection head 240 includes a circular pipe having an inner diameter corresponding to the outer diameter of the second auger main body 210 and a plurality of connection pin holes 241 Is formed.

The outer diameter D2 of the agitating reverse helix 130 of the first auger file 100 and the agitating reverse helix 230 of the second auger file 200 is set to be the forward helix of the first auger 100 The outer diameter D2 of the backward helices 130 and 230 for stirring is smaller than the inner diameter DH of the ground hole H formed by the forward helix 120 for cutting, So that the downward flow of the cement milk injected for grouting is prevented from being impeded by the reverse helixes 130 and 230 for stirring so that the downward flow of the cement milk can be smoothly performed and the grouting can be effectively performed .

Hereinafter, the operation of the helical file according to the present embodiment will be described.

The boom of the backhoe is adjusted in a state where the connecting head 140 coupled to the upper end of the first auger file 100 is connected to the hydraulic rotating device (not shown) by the connecting pin 120, So that the piercing head 160 at the lower end of the piercing head 160 contacts the ground.

The entire first auger file 100 including the connection head 140 and the first auger main body 110 and the punching head 160 is rotated by the rotation of the hydraulic rotary device to which the first auger file 100 is coupled, .

At this time, the boom of the backhoe is gradually lowered so that the hydraulic rotary device and the first auger file 100 are lowered while rotating. The descending speed of the backhoe boom is maintained at the set speed in accordance with the cutting speed by the cutting forward helix 120. Also, in the ground cutting process using the forward helix 120 for cutting, the cutting speed is lowered according to the hardness of the ground or when the rock is cut. Therefore, the work is performed while lowering the backhoe boom downward speed.

When the hydraulic rotating device and the first auger 100 are rotated and lowered, the ground is drilled first by the piercing head 160.

As the ground penetration progresses by the piercing head portion 160, the ground cutting is performed by the cutting edge 121 formed at the lower end of the cutting forward helix 120 of the first auger 100, The penetration step of the mobile terminal 100 proceeds.

The cutting hole H is formed in the ground when the ground cutting is performed by the cutting edge 121 of the cutting forward helix 120. The cutting hole H corresponds to the outer diameter H1 of the cutting forward helical 120 And has an inner diameter DH that is larger than the outer diameter D2 of the stirring forward reverse helix 130 (see FIG. 2).

When grouting cement milk is injected between the upper end of the cutting hole H and the outer peripheral surface of the first auger main body 110 in the course of the penetration of the first auger file 100, The cemented milk flows into the clearance of the soil slurry cut by the cutting forward helix 120 of the slope 100 and flows downward.

At this time, since the agitating reverse helix 130 of the first auger 100 and the agitating reverse helix 230 of the second auger 200 are formed to have an outer diameter smaller than the outer diameter of the cutting forward helix 120 Since the outer diameters of the reverse helixes 130 and 230 for stirring are smaller than the inner diameters of the cutting holes formed in the ground during the cutting and penetration processes, the reverse helix 130 for stirring during the injection of the cement milk for grouting causes the downward flow of the cement milk The downward flow of the cement milk can be smoothly performed.

At the same time, the soil slurry cut by the cutting forward helix 120 is stirred upward by the reverse helix 130 for stirring so that the cement milk injected and the ground slurry are sufficiently agitated.

When the first auger file 100 is intruded to the vicinity of the upper end of the first auger file 100, the hydraulic rotary device is stopped, the first auger file 100 is separated from the hydraulic rotary device, After connecting the lower end of the auger file 200, the upper end of the second auger file 200 is connected to the hydraulic rotating device.

The connection between the first auger file 100 and the second auger file 200 is performed by inserting the lower end of the second auger file 200 into the connection head 140 coupled to the upper end of the first auger file 100, The connecting bolt 151 constituting the pin 150 is passed through the bolt through hole 141 of the connecting head 140 and the connecting nut 152 is fastened to the projecting end of the connecting bolt 151.

The connecting head 240 coupled to the upper end of the second auger file 200 connected to the upper end of the first auger file 100 is connected to the connecting bolt 151 and the connecting nut 152 constituting the connecting pin 150, To the hydraulic rotary device.

In this state, when the hydraulic hoisting machine is operated and the backhoe boom is lowered, the drilling operation of the drilling head 160 of the first auger 100 and the cutting operation of the cutting edge 121 of the forwarding helix 120 for cutting The ground cutting process is continued.

In this process, the reverse helix 230 for stirring the reverse helix 130 of the first auger 100 and the second auger 200 of the first auger 100 are pushed up and agitated.

As a result, the ground soil and the continuously injected cement milk are sufficiently agitated.

Thereafter, another second auger file 200 may be connected to the upper end of the second auger file 200 according to the penetration depth, and when the final second auger file 200 is connected and the penetration is completed, The injection of milk, the operation of the hydraulic rotating device and the descent of the backhoe boom are stopped.

Here, the cement milk injected in the first intrusion of the first auger file (100) is continuously fed to the ground by the inverted helixes (130, 230) for stirring until the intrusion process of the final second auger file (200) So that it does not harden until completion of the final penetration and does not affect the ground penetration by the piercing head portion 160 and the ground cutting and penetration process by the forwarding helix 120 for cutting.

When the final penetration is completed, cement milk for grouting is already injected into the cutting hole (H) during the penetration step by ground penetration and ground cutting, and the ground soil is sufficiently agitated. Therefore, a separate grouting step If the mixed soil and cement milks are hardened, the construction can be completed by going through the head cleaning step and the docking test step.

As described above, in the auger file according to the present embodiment, the forward auger for cutting having a cutting edge together with the perforation head is provided at the lower end of the first auger file, a reverse helix for stirring is provided at the upper portion thereof, The second auger file connected to the top of the second auger file is provided with a reverse helix for stirring, so that the ground soil and the injected cement milk are sufficiently stirred by injecting the cement milk in the penetration step by penetration and cutting of the ground, If the ground soil and cement milk are hardened without going through a separate grouting step, the construction can be completed by just passing the head cleaning step and the dynamic test step, so that the air can be shortened to about half.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: first auger file 110: first auger file main body
120: forward helix for cutting 130: reverse helix for agitation
140: connecting head 150: connecting pin
160: perforation head unit 200; Second auger file
210: Second auger file main body 230: Reverse helix for stirring
240: connection head

Claims (1)

A first auger file 100 assembled at the first stage and a second auger file 200 connected to the first auger file 100,
The first auger file 100 includes a first auger main body 110 formed of a circular pipe, a cutting forward helix 120 coupled to a lower end of the first auger main body 110, And an agitating reverse helix (130) coupled from the top of the helix (120) to the vicinity of the top of the first auger main body (110)
The cutting forward helix 120 is constituted by a right-handed helix of one revolution and a cutting edge 121 is formed at a lower end thereof,
The agitating reverse helix 130 is composed of a plurality of left-hand spirals,
The lower end of the first auger main body 110 is provided with a perforated head 160 cut obliquely and having a sharp tip,
The second auger file 200 includes a second auger file main body 210 having a circular pipe having the same diameter as the first auger file main body 110 and a second auger file main body 210 coupled to the outer peripheral surface of the second auger file main body 210 And an agitating reverse helix 230,
The pitch P1 of the cutting forward helix 120 of the first auger file 100 is set so that the reverse helix 130 for stirring of the first auger 100 and the reverse helix 130 for the agitation of the second auger 200 Is smaller than the pitch (P2) of the helix (230)
The outer diameter D2 of the agitating reverse helix 130 of the first auger file 100 and the agitating reverse helix 230 of the second auger file 200 is set to be the forward helix of the first auger 100 The outer diameter D2 of the backward helices 130 and 230 for stirring is smaller than the inner diameter DH of the ground hole H formed by the forward helix 120 for cutting, Lt; / RTI >
A connection head 140 for coupling to the hydraulic rotary device or the second auger file 200 is coupled to the upper end of the first auger main body 110,
The connection head 140 is formed of a circular pipe having an inner diameter corresponding to the outer diameter of the first auger main body 110,
Wherein a plurality of connection pin holes (141, 220) are formed at the lower ends of the connection head (140) and the second auger main body (210) to fit the connection pin (150).

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