KR102643714B1 - Thread bar coupling device, seismic pile having the same and construction method for seismic pile - Google Patents

Abstract

A threaded bar coupling device is disclosed, the threaded bar coupling device comprising: a lower nut screwed to the threaded bar on the inside of a lower portion of a guide tube; a lower thread bar fixing disk having a lower hole through which the thread bar passes and disposed on the lower nut inside the guide pipe; an upper nut screwed to the threaded bar on the inside of the upper part of the guide tube; an upper thread bar fixing disk having an upper hole through which the thread bar passes, and disposed on the lower side of the upper nut at a distance from the lower thread fixing disk inside the guide tube; and an elastic member disposed in a final compressed state between the lower thread bar fixing disk and the upper thread bar fixing disk.

Description

Threaded bar coupling device, earthquake-resistant pile including same, and earthquake-resistant pile construction method {THREAD BAR COUPLING DEVICE, SEISMIC PILE HAVING THE SAME AND CONSTRUCTION METHOD FOR SEISMIC PILE}

The present disclosure relates to earthquake-resistant piles and earthquake-resistant pile construction methods, such as threaded bar coupling devices, multi-axis earthquake-resistant piles including the same, hybrid earthquake-resistant piles, etc.

A lot of research is being done on the earthquake-resistant structure of buildings to respond to earthquakes, but when an earthquake occurs, more damage can occur due to foundation collapse and toppling rather than collapse of the building itself.

However, in the past, the application of earthquake-resistant structures to building foundations was not widespread, and it was especially difficult to find earthquake-resistant pile technology that could be applied to medium-sized buildings of 3 to 7 stories. In addition, the shear reinforcement technology for the upper part of the pile can be applied to large-scale structures, and there are cases where multiple small-diameter micro piles are installed to prevent toppling of medium-sized buildings, but there is a problem of low efficiency. In addition, small-diameter micro piles are vulnerable to moment and shear forces caused by horizontal loads, so they may be destroyed when a horizontal excitation force of 0.2 to 0.3 g is applied and may not function as a pile.

Accordingly, in order to overcome these conventional problems, a multi-axis (e.g. three-axis) seismic pile structure is disclosed in Patent Registration No. 10-2014125, and a hybrid seismic pile structure is disclosed in Patent Registration No. 10-2412079. It has been initiated.

The disclosed three-axis earthquake-resistant pile structure includes a head joint plate, a plurality of guide pipes, and a pile that passes through each of the plurality of guide pipes and is anchored to the ground, and is provided to resist horizontal loads caused by earthquakes. The disclosed three-axis earthquake-resistant pile structure can have the effect of forming an efficient and stable foundation structure with the ability to withstand not only the vertical load caused by the superstructure but also the horizontal load caused by earthquakes.

In addition, the disclosed hybrid earthquake-resistant pile structure includes an external steel pipe, an internal steel pipe, a non-shrinkage concrete part, etc., and the internal steel pipe, an external steel pipe, and a non-shrinkage concrete part can act as an integrated structure, so that the internal steel pipe, the external steel pipe, and the non-shrinkage concrete part can act as an integrated structure, so that there is no shrinkage against compressive force, tensile force, moment, etc. Since the concrete part, internal steel pipe, and external steel pipe can resist together, they can effectively resist not only compressive force, but also tensile force, moment, etc.

However, when using threaded bars as micropiles, the development of a coupling device that allows these micropiles to be more easily applied to piles such as hybrid earthquake-resistant pile structures, hybrid earthquake-resistant pile structures, etc. is still underdeveloped.

The present application is intended to solve the problems of the prior art described above, and includes a thread bar coupling device for coupling a thread bar to a guide pipe to be applied to earthquake-resistant piles such as conventional multi-axis earthquake-resistant piles, hybrid earthquake-resistant piles, etc., earthquake-resistant piles and earthquake-resistant piles including the same. The purpose is to provide a construction method.

However, the technical challenges sought to be achieved by the embodiments of the present application are not limited to the above technical challenges, and other technical challenges may exist.

As a technical means for achieving the above-described technical problem, a threaded bar coupling device according to an embodiment of the present application includes a lower nut screwed to the threaded bar on the inside of the lower portion of the guide tube; a lower thread bar fixing disk having a lower hole through which the thread bar passes and disposed on the lower nut inside the guide pipe; an upper nut screwed to the threaded bar on the inside of the upper part of the guide tube; an upper thread bar fixing disk having an upper hole through which the thread bar passes, and disposed on the lower side of the upper nut at a distance from the lower thread fixing disk inside the guide tube; and an elastic member disposed in a final compressed state between the lower thread bar fixing disk and the upper thread bar fixing disk.

An earthquake-resistant pile according to an embodiment of the present application may include a threaded bar coupling device according to an embodiment of the present application and a threaded bar coupled to the threaded bar coupling device.

The earthquake-resistant pile construction method according to an embodiment of the present application includes the steps of (a) placing the thread bar as a micropile in a hole drilled through the guide pipe; (b) coupling the thread bar to the guide tube using the thread bar coupling device; and (c) filling and curing a material for cementitious hardening inside the guide tube through an injection hole formed in the guide tube.

The above-described means of solving the problem are merely illustrative and should not be construed as intended to limit the present application. In addition to the exemplary embodiments described above, additional embodiments may be present in the drawings and detailed description of the invention.

According to the means for solving the problem of the present application described above, a lower thread bar fixing disk surrounding the thread bar is provided to be supported downward by a lower nut inside the guide tube and supported upward by an elastic member, and an upper thread bar fixing disk surrounding the thread bar Since the inside of the guide tube is supported upwardly by an upper nut and supported downwardly by an elastic member, the threaded bar can be stably coupled to the guide tube.

Figure 1 is a schematic perspective view showing a partial configuration of a multi-axis earthquake-resistant pile to which a thread bar coupling device according to an embodiment of the present application is applied.
Figure 2 is a schematic conceptual cross-sectional view of a threaded bar coupling device according to an embodiment of the present application applied to one guide pipe of a multiaxial earthquake-resistant pile.
Figure 3 is a schematic conceptual cross-sectional view of a threaded bar coupling device according to an embodiment of the present application applied to a hybrid earthquake-resistant pile.

Below, with reference to the attached drawings, embodiments of the present application will be described in detail so that those skilled in the art can easily implement them. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present application in the drawings, parts that are not related to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout this specification, when a part is said to be “connected” to another part, this includes not only the case where it is “directly connected,” but also the case where it is “electrically connected” with another element in between. do.

Throughout this specification, when a member is said to be located “on”, “above”, “at the top”, “below”, “at the bottom”, or “at the bottom” of another member, this means that a member is located on another member. This includes not only cases where they are in contact, but also cases where another member exists between two members.

Throughout the specification of the present application, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

In the description of the embodiments of the present application, terms related to direction or position (upper, upper, lower, lower, longitudinal, transverse, etc.) are set based on the arrangement of each component shown in the drawings. For example, when looking at Figure 1, the 12 o'clock direction may be the upper side, the overall 12 o'clock direction may be the upper side, the 6 o'clock direction may be the overall lower side, and the 6 o'clock direction may be the overall lower side, etc. . However, the embodiments of the present application may be arranged or used with the lower side facing in a different direction.

The present application relates to a threaded bar coupling device, a seismic pile including the same, and a method of constructing the seismic pile. A pile including a threaded bar coupling device according to an embodiment of the present application may be an earthquake-resistant pile. As a more specific example, the pile may be a multi-axis earthquake-resistant pile or a hybrid earthquake-resistant pile, which will be described later. However, hereinafter, for convenience of explanation, the thread bar coupling device according to an embodiment of the present application will be described with an emphasis on the multi-axial earthquake-resistant pile structure among the various earthquake-resistant pile structures to which the present application can be applied.

First, a description will be given of the thread bar coupling device (hereinafter referred to as 'this device') 1 according to an embodiment of the present application.

Referring to Figures 1 and 2 together, the device (1) is placed on the guide tube (3) so that the thread bar (2) is applied to a pile using a micropile, passing through the inside of the guide tube (3). It is a thread bar coupling device that couples the thread bars (2). For reference, the present device 1 can be applied to piles such as earthquake-resistant piles (for example, seismic piles such as multi-axis earthquake-resistant piles or hybrid earthquake-resistant piles) as described above.

Illustratively, when the present device 1 is applied to a multi-axis earthquake-resistant pile, the guide pipe may be a guide pipe of the multi-axis earthquake-resistant pile. Multi-axis earthquake-resistant piles include three-axis earthquake-resistant piles that can be understood through previously disclosed patents such as Registered Patent Publication No. 10-2014125, and can be understood through the registered patent publication (for example, the registered patent publication The guide pipe may correspond to the guide pipe of the thread bar coupling device according to an embodiment of the present application, and the file of the registered patent publication may correspond to the thread bar of the thread bar coupling device according to an embodiment of the present application. Therefore, detailed description is omitted. Alternatively, when the device (1) is applied to a hybrid earthquake-resistant pile, the guide pipe (3) can be an external steel pipe, the threaded bar (2) can be an internal steel pipe, and the device (1) can be used to connect the internal steel pipe to the external steel pipe. It can be applied to join steel pipes. Hybrid earthquake-resistant piles can be understood through previously disclosed patents such as Registration No. 10-2412079.

Referring to Figure 1, the device 1 includes a lower nut 11. The lower nut 11 is screwed to the threaded bar 2 on the inside of the lower part of the guide tube 3. The threaded bar 2 may have threads formed on its outer surface. In addition, the lower nut 11 is provided to surround the threaded bar 2 and can be screwed to the threaded bar 2. The lower nut (11) is screw-coupled with the threaded bar (2), so its position (height) can be adjusted.

Also, referring to Figure 1, the device 1 includes a lower threaded bar fixing disk 12. The lower threaded bar fixing disk 12 has a lower hole through which the threaded bar 2 passes. Additionally, the lower threaded bar fixing disk 12 is disposed on the lower nut 11 on the inside of the guide tube. The lower thread bar fixing disk 12 may be provided to surround at least a portion of the thread bar 2. In other words, the lower thread bar fixing disk 12 may be provided so that the thread bar 2 passes through the lower hole 123. Additionally, the lower nut 11 can press the lower threaded bar fixing disk 12 from the bottom to the top. Accordingly, the lower thread bar fixing disk 12 is supported by the lower nut 11 and can be disposed while pressing an elastic member to be described later.

Additionally, the lower threaded bar fixing disk 12 may have an outer diameter that is less than or equal to the inner diameter of the guide tube 3.

Additionally, the lower nut 11 may have a width smaller than the inner diameter of the guide tube 3 to allow it to pass through the guide tube 3. Accordingly, the lower nut 11 can pass through the guide tube 3 when the threaded bar 2 is disposed while being screwed to the threaded bar 2.

In addition, the device 1 includes an upper nut 13 that is screwed to the threaded bar 2 on the inside of the upper part of the guide tube 3.

In addition, this device (1) has an upper hole (143) through which the threaded bar (2) passes, and has an upper nut (13) at a distance from the lower threaded bar fixing disk (12) on the inside of the guide tube (3). It includes an upper threaded bar fixing disk 14 disposed on the lower side. The upper thread bar fixing disk 14 may be provided to surround at least a portion of the thread bar 2. In other words, the upper thread bar fixing disk 14 may be provided so that the thread bar 2 passes through the upper hole 143. Additionally, the upper nut 13 may press the upper threaded bar fixing disk 14 downward. Accordingly, the upper threaded bar fixing disk 14 is pressed by the upper nut 13 and can be disposed while pressing the elastic member 15, which will be described later.

Additionally, the upper threaded bar fixing disk 14 may have an outer diameter less than or equal to the inner diameter of the guide tube 3. Accordingly, the upper threaded bar fixing disk 14 can be placed inside the guide tube 3.

For reference, in the present application, the lower thread bar fixing disk 12 and the upper thread bar fixing disk 14 may have shapes (eg, symmetrical shapes) and functions that correspond to each other.

In addition, the lower threaded bar fixing disk 12, the lower nut 11, the upper threaded bar fixing disk 14, and the upper nut 13 are smaller than the inner diameter of the guide tube 3 so that they can pass through the guide tube 3. You can have apocrypha. For reference, in the case of a nut herein, it may be understood that the maximum width is referred to as the outer diameter.

Additionally, the device 1 includes an elastic member 15 disposed in final compression between the lower threaded bar retaining disk 12 and the upper threaded bar retaining disk 14. The elastic member 15 disposed in the final compressed state can maintain the gap between the lower thread bar fixing disk 12 and the upper thread bar fixing disk 14. That is, the lower thread bar fixing disk 12 may be supported by the lower nut 11 on the lower side and the elastic member 15 on the upper side, and the upper thread bar fixing disk 14 may be supported on the lower side. It may be supported by an elastic member 15, and may be supported on the upper side by an upper nut 13.

In addition, the lower nut 11 and the elastic member 15 may be provided to allow the operator access for tightening the lower nut 11 through the lower side of the guide tube 3 in the final compressed state. In other words, the screw tightening of the lower nut (11) is preferably performed by the operator on the lower side of the guide tube (3), that is, through the space between the guide tube (3) and the ground. . Accordingly, the thickness (height) of the lower nut 11, the length of the elastic member 15, the elastic coefficient of the elastic member 15, etc. allow the lower nut 11 to be smoothly maintained until the final compressed state of the elastic member 15. It is desirable that they are mutually considered so that they can be tightened through the lower side of the guide tube.

For example, in the final compressed state, the lower nut 11 may be provided with a thickness that allows access and engagement of a work tool for tightening the nut through the lower side of the guide tube 3.

As another example, the lower nut 11 may be provided so that a portion of the lower nut 11 protrudes downward from the lower end of the guide tube 3 in the final compressed state of the elastic member 15. Accordingly, the lower nut 11 may maintain a state in which a portion of the lower nut 11 protrudes downward from the lower end of the guide tube 3 while the screw is tightened from the initial compressed state to the final compressed state. Therefore, it can be easy for the worker to tighten the screw.

For reference, in this application, height can also be understood as depth. Specifically, during the installation process of the device 1 on the ground, it can be understood as a height and also as a concept of depth after installation.

According to the above, referring to FIG. 2, the device 1 can couple the threaded bar 2 to the guide tube 3. Specifically, according to the device 1, the lower thread bar fixing disk 12 surrounding the thread bar 2 is fixed to the guide tube 3 by the lower nut 11 and the elastic member 15, and the thread bar The upper threaded bar fixing disk (14) surrounding (2) is fixed to the guide tube (3) by the elastic member (15) and the upper nut (13), so that the threaded bar (2) can be fixed to the guide tube (3). there is.

In addition, in the final compression state, the amount of elastic compression of the elastic member 15 is determined by the upper thread bar fixing disk 14 and the lower thread bar fixing disk ( 12) It can be set considering maintaining the distance between the two.

In other words, the final compression state of the elastic member 15 may mean a compression state preset during the design process or planning process. For example, the elastic member 15 may respond to a typical external shock applied during work. This may mean having a state that allows only elastic deformation within the allowed compression size. Accordingly, in the final compression state, the elastic compression amount of the elastic member (!5) is within the elastic deformation within the compression size allowed for normal external impact, and the thread bar fixing disk 14 and the lower thread bar fixing disk 12 It can be set to maintain the gap between them.

Accordingly, the elastic member 15 is disposed between the upper thread bar fixing disk 14 and the lower thread bar fixing disk 12 in the final compressed state, so that the upper thread bar fixing disk 14 and the lower thread bar fixing disk 12 ) can be maintained stably.

In addition, referring to FIGS. 1 and 2, the device 1 has an external hole 161 through which the threaded bar 2 passes, and includes an external disk 16 provided on the upper side of the guide tube 3. can do. The external disk 16 may have an outer diameter greater than or equal to that of the guide tube 3. Additionally, the outer disk 16 preferably has an inner diameter that is less than or equal to the inner diameter of the guide tube 3. Accordingly, the external disk 16 can support the guide tube 3 on the upper side of the guide tube 3.

Additionally, referring to FIGS. 1 and 2 , the device 1 may include an external nut 17 that is screwed to the threaded bar 2 on the upper side of the external disk 16 .

In addition, the guide pipe 3 may include a pipe portion 31 and a wing portion 32 extending radially outward from the top of the pipe portion 31. The wing portion 32 may be formed to extend along the circumference of the crown portion 31.

Referring to FIGS. 2 and 3 , at least a portion of the external disk 16 may be provided to face the wing portion 32 .

Additionally, referring to FIG. 2 , the device 1 may include a fastening unit 18 that couples the wing portion 32 and the external disk 16 to each other. For example, fastening unit 18 may be a bolt. However, the type of fastening unit 18 is not limited to this and may be provided in various forms. Referring to FIGS. 2 and 4, the external disk 16 has a hole 168 into which the fastening unit 18 is inserted (for example, a female-threaded hole that can be screwed with a bolt) and a threaded bar 2. An insertion hole 162 may be formed.

Additionally, referring to FIG. 3, the external disk 16 may be provided with a connecting reinforcing bar 19 that is coupled to the external disk 16 and the concrete portion of the foundation. For example, the connecting reinforcing bar 19 may be inserted into a hole formed in the wing portion 32 and the external disk 16 and disposed with its lower portion bent so as not to be removed from the hole. Referring to FIGS. 3 and 4, a hole 169 into which the connecting reinforcing bar 19 is inserted and a hole 162 into which the threaded bar 2 is inserted may be formed in the external disk 16. In addition, the connecting reinforcing bar 19 may be fixed (temporarily fixed) by welding around the hole 169, but is not limited to this.

Referring to FIGS. 2 to 4, a hole 168 into which the fastening unit 18 is inserted and a hole 169 into which the connecting reinforcing bar 19 is inserted may be formed in the external disk 16, and the hole 168 ), the fastening unit 18 is fastened, and the connecting reinforcing bar 19 can be placed through the hole 169.

According to the above, the external disk 16 is provided in contact with the upper nut 13 and can be fastened to the wing portion 32 of the guide tube 3. Accordingly, a more stable structure can be provided.

Additionally, referring to FIGS. 2 and 3 , the lower threaded bar fixing disk 12 may include a lower guide key 121 supporting the lower inner surface of the guide tube 3. The lower guide key 121 protrudes upward from the lower thread bar fixing disk 12, is inserted into the guide tube 3, and may be in contact with the lower inner surface, and can support the guide tube 3 from the inside. . For example, the lower guide key 121 may be slightly temporarily fixed (forcibly fitted) to the guide tube 3 due to a certain amount of friction in contact with the inner surface of the guide tube 3.

Additionally, referring to FIGS. 2 and 3 , the upper threaded bar fixing disk 14 may include an upper guide key 141 supporting the upper inner surface of the guide tube 3. The upper guide key 141 may protrude downward from the upper threaded bar fixing disk 14, be inserted into the guide tube 3, and be in contact with the upper inner surface, and may support the guide tube 3 from the inside. . For example, the upper guide key 141 may be slightly temporarily fixed (forcibly fitted) to the guide tube 3 due to a certain amount of friction in contact with the inner surface of the guide tube 3.

In addition, referring to FIG. 1, an injection hole 31a may be formed in the guide tube 3 for filling with a cementitious hardening material (for example, it may include one or more of cement milk, concrete, etc.). . The guide tube 3 may be filled with a material for cementitious hardening through the injection hole 31a.

In this way, the inside of the guide tube 3 may be filled with a cementitious hardening material.

In addition, the elastic member 15 may have a spring spiral structure that spirally surrounds the threaded bar 2 and extends up and down, considering the bonding force with the cementitious hardening material. The elastic member 15 may function as a stud, and thus the coupling force between the thread bar 2 and the guide tube 3 may be improved.

Additionally, the present application can provide an earthquake-resistant pile according to an embodiment of the present application. The earthquake-resistant pile includes the device 1 described above and a threaded bar 3 coupled to the device 1. As described above, the seismic pile may be a multi-axis seismic pile or a hybrid seismic pile, but is not limited thereto.

Hereinafter, a seismic pile construction method (hereinafter referred to as ‘this construction method’) according to an embodiment of the present application will be described. Illustratively, this construction method can be applied to seismic piles such as multi-axis seismic piles, hybrid seismic piles, etc., but is not limited thereto, and various seismic pile structures that can adopt guide pipes and threaded bars (micropiles) Of course, it can be applied to . However, for convenience of explanation, this construction method will be described below, focusing on the multi-axial earthquake-resistant pile structure among various pile structures.

This construction method includes the step (first step) of placing the threaded bar 2 as a micro pile in the drilled hole through the guide tube 3. In the first step, the lower nut 11 may be screwed to the threaded bar 2. At this time, the lower nut 11 can pass through the guide tube 3 as described above, so when the threaded bar 2 is inserted into the guide tube 3, the lower nut 11 passes through the guide tube 3. It may be located on the lower side of the guide tube (3). In addition, after the first step, the lower nut 11 is preferably disposed so that a portion thereof protrudes downward from the guide tube 3. Accordingly, the operator can easily screw the lower nut 11 and move it upward in the second step, which will be described later.

Additionally, in the first step, the threaded bar 2 may be placed with the lower threaded bar engaging disk 12 disposed on the lower nut 11. Alternatively, after placement of the threaded bar 2, the lower threaded bar engaging disk 12 may be placed on the lower nut 11. For example, after the thread bar 2 is placed, the lower thread bar coupling disk 12 is placed through the thread bar 2 and moved from the upper side to the lower side so that the thread bar 2 is located in the lower hole 123. can do.

Additionally, in this construction method, perforation can be performed using the guide pipe (3) before the first step. For example, a plurality of guide tubes 3 may be provided. In this case, the present construction method can perform multi-axis (multi-axis) drilling using a plurality of guide tubes 3. Drilling can be done through auger boring. Specifically, a steel pipe (casing) equipped with an auger inside can be inserted into the guide pipe to drill the ground along the extension direction of the guide pipe (usually about 50 cm more than the designed length). Also, in this case, the first step may be to install a plurality of files corresponding to each of the plurality of guide pipes, that is, to the plurality of axes.

Or, as another example, the guide pipe 3 may be an external steel pipe of a hybrid earthquake-resistant pile, and the threaded bar 2 may be an internal steel pipe.

Additionally, this construction method includes a step (second step) of coupling the thread bar 2 to the guide pipe 3 using the device 1.

The second step may include disposing the elastic member 15 on the lower thread bar fixing disk 12.

In addition, the second step may include disposing the upper threaded bar fixing disk 4 on the upper side of the elastic member 15 and disposing the upper nut 13 on the upper threaded bar fixing disk 14. . Additionally, the second step may include tightening the lower nut 11 so that the elastic member 15 reaches its final compressed state. In this step, the lower nut 11 is screwed and moved upward, and the lower thread bar fixing disk 12 is pressed and moved upward so that the elastic member 15 is in a final compressed state. If necessary, the second step may include tightening the top nut 13 so that the elastic member 15 reaches its final compressed state. In this step, the upper nut 13 can be moved downward by screwing and the upper threaded bar fixing disk 14 can be moved downward by pressing it. Additionally, if necessary, the steps of tightening the upper nut 13 and the steps of tightening the lower nut 11 may be performed simultaneously, and the order of succession may be changed, if necessary.

In addition, the second step is to place the outer disk 16 on the upper nut 13 and place the outer nut 17 on the outer disk 16 so that the outer disk 17 is attached to the upper nut 13. It can be brought into close contact, and the outer disk 16 and the wings of the guide tube 3 can be combined with the fastening unit 18. For example, fastening unit 18 may be a bolt. However, the type of fastening unit 18 is not limited to this and may be provided in various forms.

In addition, this construction method includes the step of filling and curing the cementitious hardening material inside the guide pipe (3) through the injection hole (31a) formed in the guide pipe (3) (third step).

In addition, in this construction method, after the third step, grouting the space between the drilled hole and the thread bar 2 with a cementitious hardening material, site preparation, foundation construction, etc. can be performed. Since the steps following the third step are self-explanatory to those skilled in the art in pile construction, detailed description will be omitted.

In addition, when the present application is applied to multi-axis earthquake-resistant piles, in the foundation construction stage, the foundation can be constructed so that the multi-axis guide pipe structure and the foundation are integrated through the reinforcing bars pre-placed on the footing coupling disk 4. The footing coupling disk 4 may be provided as a coupling device with the foundation, which may be a reinforcing bar. In addition, referring to Figure 1, the multi-axis earthquake-resistant pile may include a fixing part (8) for fixing the guide tube (3) and a multi-axial earthquake-resistant pile coupling shear connection part (7).

Additionally, referring to FIG. 3, when the present application is applied to a hybrid earthquake-resistant pile, the outer disk 16 may be provided as a footing coupling disk. For example, the external disk 16 may be provided with a connecting reinforcing bar (reference numeral not assigned) that is coupled to the base portion 2. In this case, a hole into which a connecting reinforcing bar is inserted may be formed in the external disk 16, and the connecting reinforcing bar may be inserted into the hole and arranged with its lower part bent so as not to be removed from the hole. In addition, referring to Figure 3, if necessary, the connecting reinforcing bar can be inserted into the hole formed in the outer disk 16 and the wing portion 32 of the guide tube 3 and bent at the lower part so that it cannot be removed from the hole. there is.

The description of the present application described above is for illustrative purposes, and those skilled in the art will understand that the present application can be easily modified into other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present application is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present application.

1: Threaded bar coupling device
11: lower nut
12: Lower thread bar fixing disk
121: Lower guide key
123: lower hole
13: upper nut
14: Upper threaded bar fixing disk
141: Upper guide key
143: upper hole
15: Elastic member
161: external hall
16: external disk
17: External nut
18: fastening unit
2: threaded bar
3: Guide pipe
31: Gwanbu
31a: injection hole
32: wing part
4: Threaded bar fixing disk
7: Shear connection
8: Fixing part

Claims (10)

A thread bar coupling device for coupling a thread bar disposed passing through the inside of the guide tube to a guide tube so that the thread bar can be applied to a pile using a micropile,
a lower nut screwed to the threaded bar on the inside of the lower part of the guide tube;
a lower thread bar fixing disk having a lower hole through which the thread bar passes and disposed on the lower nut inside the guide tube;
an upper nut screwed to the threaded bar on the inside of the upper part of the guide tube;
an upper thread bar fixing disk having an upper hole through which the thread bar passes, and disposed on the lower side of the upper nut at a distance from the lower thread bar fixing disk inside the guide tube; and
A thread bar coupling device comprising an elastic member disposed in a final compression state between the lower thread bar fixing disk and the upper thread bar fixing disk. According to paragraph 1,
The lower nut and the elastic member are provided to allow a worker to access the lower nut for tightening through the lower side of the guide tube in the final compression state. According to paragraph 1,
In the final compression state, the lower nut is provided with a thickness that allows access and engagement of a work tool for tightening the nut through the lower side of the guide tube. According to paragraph 1,
In the final compression state, the elastic compression amount of the elastic member is set in consideration of maintaining the gap between the upper thread bar fixing disk and the lower thread bar fixing disk until curing after filling the cementitious material inside the guide tube. , threaded bar coupling device. According to paragraph 1,
an external disk provided on the upper side of the guide tube and having an external hole through which the threaded bar passes; and
It further includes an external nut screwed to the threaded bar on the upper side of the external disk,
The external disk has an outer diameter larger than the outer diameter of the guide tube. According to clause 5,
The guide tube includes a pipe portion and a wing portion extending radially outward from the top of the pipe portion,
The threaded bar coupling device further includes a fastening unit that couples the wing portion and the external disk to each other. According to paragraph 1,
The inside of the guide tube is filled with a cementitious hardening material,
The elastic member has a spring spiral structure that surrounds the thread bar in a spiral shape and extends up and down in consideration of the bonding force with the cementitious hardening material. An earthquake-resistant pile comprising a threaded bar coupling device according to claim 1 and a threaded bar coupled to the threaded bar coupling device. According to clause 8,
The seismic pile is a multi-axis seismic pile or a hybrid seismic pile. As a construction method of earthquake-resistant piles according to paragraph 8,
(a) placing the threaded bar as a micropile in a hole drilled through the guide tube;
(b) coupling the thread bar to the guide tube using the thread bar coupling device; and
(c) A method of constructing earthquake-resistant piles, comprising the step of filling and curing a cementitious hardening material inside the guide pipe through an injection hole formed in the guide pipe.

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