KR101243928B1 - Pile construction method using two excavating equipments and non welding type linked casing - Google Patents

Abstract

PURPOSE: A ground excavation type pile construction method using a casing having a non-welding connection with two excavating equipments is provided to reduce the installation time for a casing and a screw and to bury a pile after a rapid excavation by a non-welding connection for the upper part of the casing inserted in advance and the lower part of the casing inserted afterwards. CONSTITUTION: A ground excavation type pile construction method using a casing having a non-welding connection with two excavating equipments comprises the following steps of: a step of preparing a first and a second ground excavation equipment attached with a first and a second casing(10, 20) and with a first and a second screw; a step of moving back by the separation of the connection after the first ground excavation equipment is placed on a boring position and the first casing and the first screw which rotates for excavating are inserted into the ground; a step of excavating by rotating to a predetermined depth after the second ground excavation equipment is introduced to connect the first and the second screw and a key groove fastener(21) of the second casing connected to a gap through the non-welding work to the key(11) of the first casing; a step of moving the second screw back by separating and drawing from the first screw after the second casing is separated and left on the ground; a step of moving and drawing the rest of the first screw by introducing the first ground excavation equipment into the excavation position; a step of moving the second casing by drawing from the first casing after the key of the first casing is positioned on a casing separation prevention groove(24) of the key groove fastener by lifting the second casing with the second ground excavation equipment inserted; and a step of drawing and moving the rest of the first casing by introducing the first ground excavation equipment on the excavation position.

Description

Pile construction method using two excavating equipments and non welding type linked casing}

The present invention relates to a ground excavation pile construction method using a casing coupled with two ground excavation equipment, and in detail, two ground excavation to bury the pile in the ground for reclamation site such as soft ground or building foundation Longevity using the equipment relates to a method of constructing the pile by inserting the casing deeper than the leader length of the ground excavation equipment by coupling the casing with a play in a non-contact state and then excavating with a screw.

Generally, piles are installed on the ground for reinforcement of soft ground or for the foundation work of building structures. Such pile construction methods include laying the pile directly on the ground and reclaiming the pile by excavating the ground. to be.

First, the method of directly piling a pile on the ground is a method in which a weight such as a hammer is raised by using the hydraulic pressure of a lifting rope or a hydraulic unit, and then lowered to strike the upper portion of the pile to pile the pile on the ground. However, these methods are becoming less used due to environmental problems such as vibration, noise and dust.

The method of excavating the ground by piling the pile is a popular method recently because of the problem of direct piling of the pile. In this method, the screw is pierced through the ground using the ground excavation equipment and the pile is buried in the perforation hole . The casing is then used to prevent the collapse of the perforated ground. Ground excavation equipment consists of a screw auger and a casing auger installed on a leader installed on heavy equipment such as a crane, and a screw auger and a casing are installed at the bottom of a screw auger and a casing auger, respectively, to rotate the ground and to excavate the ground. do. That is, as the casing is inserted into the ground, a screw that rotates in the opposite direction is configured to discharge the soil out of the casing. After drilling to the required depth, the screw is drawn, the pile is buried, and then the casing is drawn out.

However, in the case of the current excavation construction, there is a problem that the construction efficiency is much lowered due to the mounting limitation of the casing. In other words, when installing the casing into the ground during auger drilling work on the shore or in a landfill area, due to the nature of the area, the pile should be deeply drilled due to the deep depth of the hard ground where the pile is installed. Excavation equipment currently used in construction in Korea Since the maximum length of the leader is about 45m and the general casing is about 29m, there is a problem that it is impossible to have a single casing to dig a hole having a depth of 50m or more.

Of course, the length of the casing can be made to order, but the actual length of the casing auger, which is about 8m, the length of the leader of commercial drilling equipment supporting the actual casing, and the casing auger that rotates the casing can be excavated. The maximum depth is about 37m.

For this reason, in the actual site, excavate only enough to be secured with a single casing, then bury the pile and hit the top of the pile by driving, etc. After securing, additional casings were inserted and used to bury piles.

However, in the method of mixing the single casing and the pile driving method, it is not necessary to weld and connect the upper and lower casings, but a method of directly striking the pile after the casing process is used, There are disadvantages such as environmental problems such as vibration, noise and dust,

In addition, the method of welding the upper and lower casing has a disadvantage in that the construction time is greatly reduced, such as the increase in construction time due to welding and poor workability, and the casing integrated by welding is vulnerable to side pressure due to its length. There is a structural problem that it is difficult to bury the pile or pull out the casing due to contact with the pile to be buried laterally buried in the ground (see Fig. 7).

As a prior art for solving these problems, Korean Patent Registration No. 10-1044485 (entitled Jangsudo casing) and 10-1126152 (titled: dual pipe multi-casing and construction method) are available.

First, 10-1044485 implemented a new type of casing means and construction method that can perform the work while increasing the length appropriately according to the depth of penetration by using the casing which can be extended when the ground drilling using the auger machine is performed. The present invention provides a casing and an installation method that can shorten the air in addition to improving the efficiency of construction such that the construction can be made and the construction time can be shortened. An inner casing having a plurality of key fastening holes on the outer circumferential surface thereof and having a plurality of key fastening holes arranged at regular intervals along the longitudinal direction, An outer casing that is selectively fastenable to each key fastener of the inner casing via a key And, the outer circumference of the upper end of the outer casing includes a stop ring to prevent the outer casing from falling into the ground while being caught by the support plate of the ground when the casing is reduced after completion of drilling, the key fastener of the inner casing is the key of the outer casing An incision formed in a straight open shape so that it can pass, a horizontal key groove capable of hanging a key on one side of the incision, and a key of an outer casing at both ends of the incision centered on the key groove The long guide casing consists of key guides composed of inclined planes in mutually symmetrical shape that induces the direction when entering for fastening, and extends the length of the inner and outer casings according to the drilling depth of the ground to allow drilling of the ground. And the construction method using the long-depth casing.

However, the prior art having the above structure has a structure in which the casing structure is a multi-stage structure composed of the antenna and the structure so that the diameter of the outer casing including the key fastener and the key thickness is larger than the pile inserted into the inner casing. In this case, the diameter of the drilled hole is increased from the pile diameter, and the amount of grouting material for fixing the pile embedded in the excavated hole increases, so that the overall construction cost and construction time are inevitably increased. For example, when a pile of 500 mm in diameter is embedded, a casing is generally used as an inner casing having an inner diameter of 558 mm and a thickness of 12 mm. The prior art uses the inner casing together with a key fastener for storing and tightening it. Since at least 700 mm of outer casing is required due to the included structure, in order to fill the casing, there is a problem in that drilling holes are required to be drilled more than necessary for the pile diameter.

In addition, the process of varying the length of the inner casing and the outer casing by using the key fastener and the key is also carried out by lifting the inner casing to the upper part of the outer casing inserted under the ground after the first drilling work is completed, and installing it in the casing auger again. After determining the length by using the fastener and the key, it is necessary to lower and excavate it again.In this case, if it is changed to a length other than the maximum extension length, the key formed on the inner diameter side of the outer casing is not fixedly supported by the key groove of the key fastener. Otherwise, there is a structural problem that the inner casing may fall into the open portion of the key fastener when rotating, so that a smooth excavation operation may be difficult.

In addition, since the outer casing and the inner casing are stored or elongated with little play by the key fastener and the key, the extended length is vulnerable to earth pressure, so that the entire outer casing and the inner casing are integrated after the excavation process or drilling of the drilling hole. Exposed to earth pressure, the center can bend. As described above, when the pile is bent, a pinching phenomenon may occur later, so that the pile may be difficult to be embedded or the casing may be difficult to pull out.

On the other hand, the prior art 10-1044485 is an antenna-type casing configuration having a structure that can be further extended in the structure of the above 10-1044485, which also includes a key fastener and a key thickness compared to the pile inserted into the inner casing As the diameter of the casing is inevitably larger, the diameter of the drilled hole is larger than the pile diameter, and the amount of grouting material to fix the pile inserted into the drill hole increases, thereby increasing the overall construction cost and construction time. In addition, the integrated multi-stage structure still has a structural problem that can not but be susceptible to bending deformation caused by earth pressure.

Korean Patent Registration Registration No. 10-1044485 (June 20, 2011) Korean Patent Registration Publication No. 10-1126152 (2012.03.06.) Domestic Patent Registration Publication No. 10-1005375 (2010.12.24.) Domestic Utility Model Registration Registration Number 20-0315734 (203.05.27)

An object of the present invention for solving the above problems is to install a casing and screws in the augers of two soil excavation equipment in order to install a pile that must be embedded with a deeper depth than the leader length of the ground drilling equipment in order The excavation and insertion of the ground by the casing reduces the installation time of the casing and screw, and at the same time provides a method of quickly refilling the pile after excavation by combining the lower casing to be inserted into the upper portion of the casing to be inserted in a non-contact manner. .

In addition, another object of the present invention is to provide a construction method that minimizes the bending deformation due to earth pressure by having a gap between the upper casing and the lower casing when the excavation using a two-step casing coupled to the non-contact.

Another object of the present invention is to provide a construction method that minimizes the difference in the diameter of the upper casing and the lower casing when the excavation using a two-step casing coupled to the non-contact casing to minimize the amount of grouting material filling the hole hole space when the pile is embedded.

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The present invention to achieve the object as described above and to solve the conventional drawbacks is a) the first ground excavation equipment and the first casing and the second casing and the second screw attached to the first casing and the first screw is attached Preparing a second ground drilling equipment;

b) thereafter positioning the first ground excavation equipment at a drilling point, rotating excavating the first casing and the first screw coupled to a predetermined depth, inserting the first casing into the ground, and releasing the coupling;

c) Then, the second ground excavation equipment enters and connects the first and second screws, and the non-welded connection using the key and the keyway fasteners with the clearance between the first and second casings, and then again to a predetermined depth. Rotary drilling;

d) then the second ground drilling rig separates the second casing and leaves in the ground and separates and draws only the second screw from the first screw;

e) after the first ground drilling equipment enters the excavation point and withdraws the remaining first screw;

f) then the pile insertion crane enters the excavation point, and inserting and pulling back the pile while maintaining the verticality inside the first and second casings;

g) Then, after lifting the 2 casings into which the second ground excavation equipment is inserted, the key formed at the upper end of the first casing is placed in the casing escape prevention groove of the keyway fastener, and withdraws only the second casing from the first casing while pulling out. Steps;

h) After the first ground excavation equipment enters the excavation point and withdraws the remaining first casing; the ground excavation pile construction method using the two ground excavation equipment and the casing coupled inexpensively Is achieved by providing

In a preferred embodiment of the present invention, the step c) may be non-contacted by coupling a cylindrical keyway fastener formed at the bottom of the second casing to a key formed on the first casing.

According to an embodiment of the present invention, the key groove fastener is a vertical key groove formed in an upper direction by opening a lower point to insert and fasten a key, a horizontal key groove formed in a left and right direction at an upper end of the vertical key groove, and a horizontal key groove. It is composed of a casing detachment prevention groove formed in the lower direction at both ends, the lower surface may be configured by a plurality of anti-wear bits are arranged.

In accordance with a preferred embodiment of the present invention, a plurality of connection groove structures formed of vertical key grooves, horizontal key grooves, and casing separation prevention grooves formed at the key groove fasteners are arranged in a plurality of predetermined intervals along the circumference of the key groove fasteners, and the keys fastened thereto. It can form in multiple numbers in a 1st casing.

The present invention may be configured to further include a reinforcing curvature plate protruded outward so as not to interfere when the key is inserted into the circumferential direction of the key groove fastener formed with the vertical key groove.

According to an embodiment of the present invention, the step c) may be such that the inner diameter of the keyway fastener formed in the lower portion of the second casing is larger than the outer diameter of the first casing in which the key is formed in the upper portion inserted therein.

The present invention is a preferred embodiment, the step d) is the second ground excavation equipment after drawing the first, second screw, the first screw is placed on the top of the second casing inserted into the ground to prevent the screw fall prevention stopper Thereafter, only the second screw may be separated and drawn out.

The present invention is a preferred embodiment, the step g) is the second ground excavation equipment draws the first and second casing, the casing around the first casing in a state that the upper portion of the first casing exposed to the predetermined height from the ground After the fall prevention stopper is installed to prevent the first casing from falling, the first and second casings may be separated to draw out only the second casing.

The present invention is a preferred embodiment, the casing fall prevention stopper and the support beam for supporting the ground; A fixed support installed on the support beam to support one side key of the first casing; A rotatable support coupled to the hinge to face the fixed support at an upper portion of the support beam to support the other key of the first casing; It may be configured to include; the insertion pin for intermittent rotation of the rotary support by passing through the hole formed in the rotary support and the support beam.

The present invention is a preferred embodiment, the support beam may be configured in a "c" shape with one direction open.

According to an embodiment of the present invention, the fixed support may have a semi-circular inner diameter portion for supporting one key of the first casing, and the rotary support may have a semi-circular inner diameter portion for supporting the other key of the first casing.

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As described above, the present invention is an auger installed in two ground excavation equipment during excavation work to insert a casing with a depth deeper than the leader length of the ground excavation equipment during pile construction for the foundation of soft ground reinforcement or building structure ( After installing the casing and screw in Auger, respectively, the casing and screw installation time was dramatically reduced by inserting the casing into the ground alternately, and in some cases, two ground excavation equipment alternately during the idle time during the alternating work. Excavation can be done at and the advantage of being able to advance the whole pile construction air,

In addition, the casing and screw are installed in the augers of two ground excavation equipments during the excavation work, and the excavation is quickly performed by combining the upper and the casings inserted in advance when the casings are sequentially inserted into the ground. The advantage of being able to construct a pile after

In addition, by using a two-stage casing coupled to the non-welded casing, the coupling portion between the upper casing and the lower casing has a clearance so that the bending deformation due to the earth pressure generated in the conventionally welded integrally formed multistage casing or non-spacing combined multistage casing. In addition, the non-bonded casing to be buried has the advantage that the verticality is improved by earth pressure due to play, thereby preventing the jamming between the pile and the casing during pile embedding and casing drawing.

In addition, by minimizing the difference in diameter between the upper and lower casings when excavating using a two-stage casing that is non-bonded, it minimizes the amount of grouting material filling the pile and the drilling hole space to advance the air and reduce the construction cost due to material cost savings. It is a useful invention with the advantage that it is an invention that is expected to be greatly used in industry.

Figure 1a is an exploded perspective view showing a non-bonded casing structure according to an embodiment of the present invention,
Figure 1b is an exploded perspective view showing a structure including a reinforcement structure of the keyway fastener of the non-joined casing according to an embodiment of the present invention,
Figure 2 is a front view showing a non-bonded casing structure according to an embodiment of the present invention,
3 is an exemplary view showing whether or not the casing is deformed by the soil pressure applied to the non-contact upper and lower casing according to an embodiment of the present invention,
Figure 4 is a flow chart showing a pile construction flow using a non-bonded casing according to an embodiment of the present invention,
5a to 5h are exemplary views showing operations for each process according to an embodiment of the present invention.
Figure 6 is an exemplary view showing a casing fall prevention stopper that the support is separated by the hinge rotation according to an embodiment of the present invention,
Figure 7 is an exemplary view showing the deformation of the casing by the earth soil pressure when using a conventional welded multi-stage casing.

Hereinafter, the configuration and the operation of the embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1A is an exploded perspective view illustrating a non-coupled casing structure according to an embodiment of the present invention, and FIG. 1B is a perspective view illustrating a structure including a reinforcing structure of a keyway fastener of a non-coupled casing according to an embodiment of the present invention FIG. 2 is a front view showing a non-coupled structure according to an embodiment of the present invention. FIG.

As shown, the non-joined casing assembly according to the present invention includes a first casing 10 forming a lower portion; It consists of a second casing 20 which is non-contacted to the top of the first casing.

A cylindrical keyway fastener 21 is welded to the lower portion of the second casing 20, and an upper portion of the first casing 10 coupled to the lower portion of the second casing 20 is inserted into the keyway fastener 21. The key 11 to be engaged is welded.

The key groove fastener 21 has a vertical key groove 22 formed in an upper direction by opening a lower point, a horizontal key groove 23 formed in a left and right direction at an upper end of the vertical key groove, and a horizontal key groove 23. It is composed of a casing departure prevention groove 24 formed in the lower direction at both ends.

The keyway fastener configured as described above engages the first casing 10 and the second casing 20 by inserting the key 11 of the first casing 10 into the vertical keyway 22, and then the second side in one direction. When the casing 20 is rotated, the key 11 hits one side or the other side of the horizontal keyway 23 to transmit the rotational force of the second casing 20 so that the first casing 10 and the second casing are coupled up and down. As the 20 rotates in conjunction with each other, the ground is inserted into the excavation.

The casing detachment preventing groove 24 is a groove used to prevent an accident that the first casing falls into the drilled hole when the first casing 10 and the second casing are drawn out of the ground. If there is only the horizontal key groove 23 without the casing departure prevention groove 24, when the key 11 of the first casing 10 is located in the vertical key groove 22 when the first casing is drawn upward, excavation is performed by a load. An accident that falls into the drilled hole may occur, so that the drawing of the first casing 10 takes a lot of time, or drawing may not be possible. However, if there is a casing detachment prevention groove 24 according to the present invention, the key 11 of the first casing 10 is inserted therein to be drawn out to prevent the first casing 10 from falling down.

The key 11 may be configured around the first casing in a plurality of two or more. In this case, the number of the vertical key groove 22, the horizontal key groove 23 and the casing detachment prevention groove 24 formed in the key groove fastener 21 is also increased. That is, the connecting groove structure formed of the vertical key groove 22, the horizontal key groove 23, the casing detachment prevention groove 24 formed in the key groove fastener 21 can be formed in a plurality of predetermined intervals along the circumference of the key groove fastener. have. With this configuration, the fastening force with the key 11 is increased, and the rotary excavation and drawing can be stably performed.

The lower portion of the first casing is formed with a ring bit 13 having a plurality of diamond bits 12 arranged around and under the ground to excavate the ground. Since the ring bit is formed as described above, the excavation is smoothly performed while preventing the lower wear of the first casing contacting the ground during excavation.

In addition, the present invention is configured by arranging a plurality of diamond bits 25 on the lower surface (lower surface) of the keyway fastener 21 formed on the lower portion of the second casing. In this configuration, the excavation is prevented while abrasion by the ground which rubs against the lower surface of the keyway fastener 21 slightly protruding in the circumferential direction to store and fasten the key.

In addition, in the present invention, the diameter of the cylindrical keyway fastener 21 formed below the second casing 20 is larger than that of the second casing 20 and the first casing 10. In this configuration, a clearance is generated between the first casing 10 which is fastened to the cylindrical keyway fastener 21 and is non-contacted. Such a clearance is formed by the lateral earth pressure applied to the casing inserted in the ground. Lateral deformation was prevented.

On the other hand, the present invention, as shown in Figure 1b the key casing is inserted into the key casing fastener 21, the key 11 is formed to cut the portion of the vertical key groove 22 is formed so as to fasten the excavation and rotation does not open during durability It can also be configured by reinforcing with the curvature plate material 26 for reinforcement.

That is, the reinforcement curvature plate 26 protruded outward so as not to interfere when the key 11 is inserted into the circumferential direction of the key groove fastener 21 in which the vertical key groove is formed, so as to reinforce the rigidity.

At this time, the reinforcing curvature plate material may be provided by forming a space through which the key 11 passes by using a single curvature plate material having a thick thickness, or welding the plurality of curvature plate materials in multiple stages to pass the key in multiple stages. You can also create and organize your own spaces. Here, the curvature plate material refers to the final shape, it may be composed of a curvature plate material by using a curvature plate from the beginning or by welding a flexible plate after curvature processing.

3 is an exemplary view showing whether or not the casing is deformed by the soil pressure applied to the non-contact upper and lower casing according to an embodiment of the present invention.

The first casing 10 and the second casing 20 in the excavation work space due to the clearance between the cylindrical keyway fastener 21 formed at the lower portion of the second casing 20 and the first casing 10, It is possible to prevent the casing from being bent.

If the upper and lower casings are integrally welded or antenna-coupled as in the related art, the upper and lower casings may be long and may be bent in the central portion of the casing by the side pressure applied to the casing. When this phenomenon occurs, the pile is stuck in the casing when the pile is inserted, there is a difficulty in reclamation, and also the casing and the pile is caught in the bent at the time of drawing the casing, the pile is drawn together, or a lot of time and difficulty may occur in the casing draw.

However, the present invention passes through the non-contact joint portion of the cylindrical keyway fastener 21 and the first casing 10, which is a place where the side pressure is rather free, so that the pressure can be evenly distributed to improve the verticality when excavation It is possible to prevent the warpage phenomenon.

In addition, the present invention is configured so that the diameter of the first casing 10 and the second casing 20 is the same or almost no difference to prevent unnecessary ground perforation. That is, since the difference in diameter between the perforation hole and the pile by the casing is large, it is possible to reduce the installation cost and the amount of the grouting material to be loaded depending on the case.

Figure 4 is a flow chart showing the pile construction flow using a non-bonded casing according to an embodiment of the present invention, Figures 5a to 5h is an exemplary view showing the operation by process according to an embodiment of the present invention.

First and second ground excavation equipments 1 and 2 used in the present invention include a crane 100 having a track running system capable of running in a rough manner like a general ground excavating equipment, A screw auger 103 for excavation and a casing auger 104 installed on the leader, and a screw and a casing are attached to the screw auger and the casing auger, respectively, to excavate the ground do. During excavation, the screw is inserted into the casing and the screw rotates in the opposite direction of the casing which is rotated and excavated to discharge the soil in the casing to the outside. Since the construction or operation of such ground excavation equipment is a general one, a detailed description thereof will be omitted. Also, reference numerals refer to numbers shown in FIGS. 1 and 2.

As shown in the construction method of the present invention, first ground excavation equipment 1, the second casing 20 and the second screw 40 to which the first casing 10 and the first screw 30 are attached. The step (S101) of preparing the second ground drilling rig 2 to which is attached is preceded. Of course, the cranes (3) should also be prepared.

After the first ground excavation equipment 1 is positioned at the perforation point and the first casing 10 and the first screw 30 coupled to the predetermined depth are inserted into the ground by rotating excavation and then released, And performs step S102.

Thereafter, the second ground drilling equipment 2 enters and connects the second screw 40 to the first screw 30, and the second casing 20 to the key 11 formed on the first casing 10. After the non-contact coupling of the lower keyway fastener 21 with the clearance therebetween, the step (S103) of rotationally excavating again to a predetermined depth is performed.

After the second ground drilling equipment 2 separates the second casing 20 and leaves it on the ground and draws the first and second screws, the first screw 30 is placed on the top of the second casing 20 inserted into the ground. After the screw fall prevention stopper 60 is installed and laid over, only the second screw 40 is separated and drawn to perform the step S104.

Thereafter, the first ground excavation equipment 1 enters and exits the first screw 30 spanned by the first screw fall prevention stopper to perform step S105.

Then, the pile insertion crane enters the excavation point, and performs the step S106 of inserting and dropping the pile while maintaining the verticality inside the first and second casings.

Then, the second ground excavation equipment (2) by lifting the two casing is inserted into the key 11 formed on the upper end of the first casing (10) to be located in the casing departure prevention groove 24 of the keyway fastener 21 The casing fall prevention stopper 70 is installed around the first casing 10 in a state where the first and second casings are drawn and the upper part of the first casing 10 is exposed and drawn from the ground at a predetermined height to install the first casing ( After the 10) does not fall, the first and second casings are separated and the second casing 20 is drawn out to perform the step S107.

Thereafter, the first ground excavation equipment 1 enters the excavation point and pulls out the first casing 10 over the casing fall prevention stopper (S108); to complete the present invention.

Thereafter, the entire process is repeated to proceed with the process of embedding the pile at the next excavation point.

On the other hand, although not shown in the drawing, in general, the verticality of the pile is maintained because the space between the drilling hole and the pile is filled by the concrete and earth in the flow state between the drilling hole and the pile when the casing is drawn out.

The first and second casings and the first and second screws installed in the casing auger and the screw auger of the first ground drilling rig 1 and the second ground drilling rig are first screws 30 inside the first casing 10. Is installed so as to be positioned, and is installed in the casing auger and screw auger of the first ground drilling equipment 1 and the second ground drilling equipment to be installed so that the second screw 40 is located inside the second casing (20).

In addition, the first ground drilling equipment (1) and the second ground drilling equipment is more convenient to be located in the same direction on the opposite side with respect to the excavation point for convenience during replacement work.

Rotation of the casing auger and screw auger is configured to rotate simultaneously in opposite directions. That is, when the casing rotates in the right direction, the screw rotates in the left direction and discharges the soil inside the casing to form a hole.

The first and second screw couplings are integrated by a conventional screw coupling method. Herein, a conventional coupling example will be described according to an embodiment. A hexagon nut groove is formed in the lower part of the upper screw, a hexagon bolt is formed in the upper part of the lower screw, and the connection part is fixed by two pins.

The predetermined depth in the step (S103) is the depth to the hard ground or rock at the bottom of the ground, the length in the present invention refers to a length of about 50m deeper than the length of the leader. Of course, such numerical values do not limit the present invention.

In addition, the second ground excavation equipment (2) is inserted into the first casing 10 and the second casing 20 is a method of non-contact coupling the key 11 and the second formed on the upper portion of the first casing (10) When the non-contact coupling by combining the keyway fastener 21 formed in the lower portion of the casing 20, the clearance is greater than the inner diameter of the keyway fastening hole formed in the lower portion of the second casing 20 is larger than the outer diameter of the lower first casing 10. By forming the key 11 formed outside the first casing 10 smaller than the vertical key groove 22, the horizontal key groove 23 and the casing departure preventing key groove formed in the key groove fastening hole formed under the second casing 20. You have a play. Of course, even with such play, there is no problem in rotation because the key 11 is bitten by each key 11.

The key 11 formed in the first casing 10 is positioned at one side or the other side of the horizontal keyway 23 of the keyway fastening hole formed at the bottom of the second casing 20 when the casing auger attached to the casing is rotated. It will transmit the rotational force. The horizontal key groove 23 is basically caught when the key 11 is drawn to prevent the fall of the first casing (10). However, since the key 11 may fall when positioned in the vertical keyway 22 when drawing, the present invention forms a casing separation preventing keyway in the downward direction at both ends of the horizontal keyway 23, respectively. When the key 11 is located in the casing departure prevention keyway, the key 11 cannot move toward the vertical keyway 22 even when it is rotated during drawing, thereby stably drawing.

The screw on the upper end of the second casing 20 in a state in which the upper end of the first screw 30 is exposed when drawing the second screw 40 into which the second ground drilling rig 2 is inserted in step S104. An anti-fall stopper is installed, which can be supported by two or more pins or steel rods.

In addition, the casing fall prevention stopper 70 is installed around the first casing 10, the second ground excavation equipment 2 is exposed to the predetermined height from the ground after drawing the first, second casing is the first casing (10) 2) A casing fall prevention stopper composed of two or more pins or iron rods on which the keys 11 formed on the upper end may span, or a casing fall prevention stopper in which the support is separated by hinge rotation, etc., so as not to fall.

In particular, referring to Figure 6, the casing fall prevention stopper that the support is separated by the hinge rotation, as shown in the "c" shaped support made of a section steel, such as "H" beam supported on the ground and open in one direction A fixed support 72 having a beam 71, a semicircular inner diameter portion 721 formed to support a key of one side of the first casing by being fixed by welding or bolting on the upper portion of the support beam, and a fixed support (on the upper portion of the support beam) 72 is coupled to the hinge (73) facing the rotatable support 74, the semi-circular inner diameter portion 731 is formed to support the other key of the first casing, the hole formed in the rotatable support and the corresponding support beam It is composed of an insertion pin 75 for intermittent rotation of the rotary support through the formed hole.

The casing fall prevention stopper 70 according to the embodiment configured as described above provides a supporting force so that the first casing does not fall on the drilling hole. That is, the opening side of the support beam 71 of the casing fall prevention stopper 70 approaches the drawn first casing so that one key of the first casing is supported on the one side fixed support 72 and then supported. When the typical support 74 is rotated about the hinge 73 and the insertion pin 75 is inserted, the other key of the first casing is supported while the rotation of the rotary support is interrupted.

In particular, the fixed support 72 and the rotary support 74 constituting the casing fall stopper of the present invention is always in contact with the first casing, even if the semi-circular inner diameter portion (721, 731) is formed to rotate the first casing It is supported stably.

The pile may be a steel pipe pile or a composite pile. The reason for using the composite pile is that the unit price of the steel pipe pile is expensive, so only the upper one point is formed of the steel pipe, and the lower portion of the composite pile made of concrete is inexpensive. In the composite pile, the steel pipe can sufficiently cope with the up and down vibration caused by the shock wave (isolated earthquake) such as an earthquake if the pile length is about 6-7m when the pile length is 50m. Since the depth is only up and down vibration, the concrete is sufficiently cope with and stable in structure.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
(1): 1st ground excavation equipment (2): 2nd earth excavation equipment
(3): crane 10: first casing
(11): key 12: bit
(13): ring bit 20: second casing
(21): Keyway fastener (22): Vertical keyway
(23): Horizontal keyway (24): Casing break-proof groove
(25): Bit 26: Curvature plate for reinforcement
30: first screw 40: second screw
(50): Pile (60): Screw fall prevention stopper
70: casing fall prevention stopper 71: support beam
(72): fixed support (73): hinge
(74): Rotary support 75: Insertion pin
100: crane 101: backstay
(102): Reader (103): Screw auger
(104): casing auger (721, 731): semicircular inner diameter

Claims (15)

a) preparing a first ground drilling rig equipped with a first casing and a first screw and a second ground drilling rig equipped with a second casing and a second screw;
b) thereafter positioning the first ground excavation equipment at a drilling point, rotating excavating the first casing and the first screw coupled to a predetermined depth, inserting the first casing into the ground, and releasing the coupling;
c) Then, the second ground excavation equipment enters and connects the first and second screws, and the non-welded connection using the key and the keyway fasteners with the clearance between the first and second casings, and then again to a predetermined depth. Rotary drilling;
d) then the second ground drilling rig separates the second casing and leaves in the ground and separates and draws only the second screw from the first screw;
e) after the first ground drilling equipment enters the excavation point and withdraws the remaining first screw;
f) then the pile insertion crane enters the excavation point, and inserting and pulling back the pile while maintaining the verticality inside the first and second casings;
g) Then, after lifting the 2 casings into which the second ground excavation equipment is inserted, the key formed at the upper end of the first casing is placed in the casing escape prevention groove of the keyway fastener, and withdraws only the second casing from the first casing while pulling out. Steps;
h) After the first ground excavation equipment enters the excavation point and withdraws the remaining first casing; the ground excavation pile construction method using the two ground excavation equipment and the casing coupled inexpensively .
The method according to claim 1,
Step c) is ground excavation type using the two ground excavation equipment and the non-contact casing, characterized in that the non-contact coupling by combining the cylindrical keyway fastener formed in the lower portion of the second casing to the key formed on the first casing Pile construction method.
The method according to claim 2,
The key groove fastener has a vertical key groove formed in an upper direction by opening a lower point to insert and fasten a key, a horizontal key groove formed in a left and right direction at an upper end of the vertical key groove, and formed in a lower direction at both ends of the horizontal key groove. A ground excavation pile construction method using two ground excavation equipment and a casing coupled inexpensively, comprising a casing detachment prevention groove, and a plurality of anti-wear bits are arranged on a lower surface thereof.
The method according to claim 3,
The connecting groove structure consisting of the vertical key groove, the horizontal key groove, the casing detachment prevention groove formed in the key groove fastener is formed in a plurality of arranged at regular intervals along the circumference of the key groove fastener, and a plurality of keys fastened thereto are formed in the first casing Ground excavation pile construction method using two ground excavation equipment and a casing coupled inexpensively.
The method according to claim 3,
Two ground excavation equipment and the casing coupled to the non-contact with the ground excavation equipment, characterized in that it further comprises a reinforcing curvature plate protruded outward so as not to interfere when the key is inserted into the circumferential direction of the key groove fastener formed with the vertical key groove Ground excavation pile construction method.
The method according to claim 1,
In step c), the two ground excavation equipments and the cost are characterized in that the inner diameter of the keyway fastener formed in the lower portion of the second casing is larger than the outer diameter of the first casing in which the key is inserted in the upper portion inserted therein. Ground excavation pile construction method using bonded casing.
The method according to claim 1,
In step d), after the second ground drilling equipment draws out the first and second screws, the first screw is installed on the top of the second casing inserted into the ground, and the screw fall prevention stopper is placed thereon. Ground excavation type pile construction method using two ground excavation equipment and the casing coupled inexpensively.
The method according to claim 1,
In the step g), the second ground drilling equipment draws the first and second casings, and installs a casing fall prevention stopper around the first casing in a state where the upper part of the first casing is exposed to the predetermined height from the ground. The ground excavation pile construction method using two ground excavation equipment and a non-bonded casing, which is a step of removing the casing and separating the first and second casings to draw out only the second casing. .
The method according to claim 8,
The casing fall prevention stopper includes a support beam supporting the ground; A fixed support installed on the support beam to support one side key of the first casing; A rotatable support coupled to the hinge to face the fixed support at an upper portion of the support beam to support the other key of the first casing; Ground excavation pile construction method using two ground excavation equipment and the casing coupled inexpensive; characterized in that it comprises a; insertion pin for intermittent rotation of the rotary support by passing through the hole formed in the rotary support and the support beam .
The method according to claim 9,
The support beam is ground excavation type pile construction method using two ground excavation equipment and the casing coupled inexpensive, characterized in that the one-way open "c" shape.
The method according to claim 9,
The fixed support is formed of a semi-circular inner diameter portion for supporting the key of one side of the first casing, the rotary support is two ground excavation equipment and non-contact coupling, characterized in that the semi-circular inner diameter portion for supporting the other key of the first casing is formed. Drilling method using ground casing.
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