KR102545245B1 - Joint between Footing and Pile capable of Rolling and Construction Method thereof - Google Patents

Abstract

The present invention relates to a joint between a footing and a pile capable of hinged behavior.
To this end, the present invention is a joint of a hollow pile that supports a concrete footing formed at the bottom of a structure and transmits a load to the ground, a rotation support is provided at the top of the head of the pile, and the rotation support is provided at the support of the footing It is characterized in that the head groove is formed and supported so that it is seated.
As a result, even when rotation occurs due to horizontal load and eccentric load, hinge behavior can be implemented based on rolling between the rotation support and the head groove, and safe, economical and reasonable hinge behavior Provides a joint between a footing and a pile can do.

Description

Joint between footing and pile capable of hinge behavior and its construction method {Joint between Footing and Pile capable of Rolling and Construction Method thereof}

The present invention relates to a joint between a footing and a pile capable of hinged behavior and a construction method thereof, and more particularly, to a joint of a hollow pile that supports a footing at the bottom of a structure and transmits a load to the ground. The present invention relates to a junction between a footing and a pile, in which a support is provided, a head groove is formed at the support of the putting, and the rotation support is seated, thereby allowing hinge behavior.

The load acting on the foundation of a structure can be implemented in a form in which the bottom surface of the foundation (footing) directly contacts the ground of the rock layer and supports the upper load, depending on the support conditions of the ground, and this is called a direct foundation. However, if the supporting ground is weak and the depth is deep, the thickness of the foundation becomes thick, so the direct foundation is inevitably a very uneconomical construction method, such as inconvenient construction, high risk of safety accidents, and difficulties in maintenance.

Therefore, in general, the foundation is installed on the upper part by driving piles at the lower end of the foundation without setting the depth of the foundation deeply, which is called a pile foundation. This pile foundation method is a method for transferring the load acting on the foundation to the support ground of the hard rock layer, and the pile plays a role in interconnecting the foundation and the support ground when the depth of the support ground is deep.

Most of the prior art related to the above-mentioned pile foundations were structures for strengthening foundations and piles. In simple terms, it was proposed as a way to mutually tighten the foundation and piles using reinforcing bars or steel plates to form a solid structure without being well combined with each other.

As a prior art document related to this, there is Korean Patent Registration No. 0378550 "Steel Pipe Pile Head Reinforcement Structure" (registered on March 19, 2003, hereinafter referred to as 'prior art literature'). As shown in FIG. 1, the prior art document includes a pair of upper and lower discs 1 and 2 to reinforce the head of the pile, and a reinforcing member 3 between the upper and lower discs 1 and 2. and lattice-type reinforcing plates 4, and a plurality of reinforcing bars 5 are coupled to the upper and lower disks 1 and 2 to realize the rigidity of the foundation and piles.

On the other hand, in such a pile foundation, if only a vertical load is applied ideally without an eccentricity applied to the foundation, the pile always resists only the vertical reaction force, so the structural behavior is simple, but the connection between the actual foundation and the pile occurs during construction due to wind, earthquake, or wind. It has very diverse and complex behaviors due to the error in the load and the eccentric load due to the asymmetric structure. In particular, when a horizontal force is applied, displacement and moment as shown in the conceptual diagram of FIG. 2 are generated in the pile according to the condition of the upper end.

However, structural analysis considering the boundary conditions of the foundation and piles ideally separates and analyzes the rigidity conditions and the hinge conditions, but in reality, a combined structure considering the boundary conditions is not produced. Recently, in some countries where earthquakes occur frequently, research is being conducted for foundation construction considering seismic performance, but no actualized foundation structure has been proposed other than a structure method in which foundations and piles are strengthened.

The present invention has been proposed to solve the problems of the prior art, and can effectively respond to hinge behavior by considering the mutual behavior between the foundation and the pile, and a safe, economical and reasonable hinge behavior is possible. Its purpose is to propose

According to the joint (J) between the footing and the pile capable of hinge behavior according to an embodiment of the present invention, the joint (J) of the hollow pile that supports the concrete footing formed at the bottom of the structure and transmits the load to the ground. , The upper end of the head 100 of the pile is provided with a cast-made rotary support 110, and a head groove 210 is formed in the support 200 of the footing, so that the head groove 210 is cast in a shape corresponding to A share key 220 is formed, and a seating groove 230 is formed and supported so that the rotation support 110 is seated at the bottom of the share key 220, and the rotation support 110 is The head part 112 supporting the support part 200 is integrally formed on the upper part of the insertion body part 111 inserted and fixed to the inner circumferential surface of the 100, and the head part 112 has a curved rolling surface 112a Is formed, a support surface 112b flat with a predetermined area is formed at the upper end of the curved rolling surface 112a, and a curved housing surface 231 is formed in a corresponding shape to the seating groove 230, , A ring plate 120 is formed on the upper outer circumferential surface of the head 100, and a fastener 121 penetrating the ring plate 120 is provided to insert the body portion 111 of the rotation support 110 It is fastened and fixed to, and the PC steel bar 300 is provided upright by penetrating the rotation support 110 of the head 100 and the through hole formed in the center of the share key 220 of the support 200, the PC steel bar Both ends of the 300 are coupled to the first fixture 310 fixed to the head 100 and the second fixture 320 buried and fixed to the support 200, respectively, at the top center of the head 112. The guide pin 113 protrudes, and the guide groove 240 with the through hole 221 extended is formed at a corresponding position in the lower seating groove 230 of the share key 220, resulting in excessive displacement in the hinge behavior process. By preventing mutual separation, the guide pin 113 is characterized in that it is formed in a cylindrical shape so that the PC steel bar 300 penetrates.

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On the other hand, the method (M) for constructing a joint between a footing and a pile capable of hinge behavior according to an embodiment of the present invention is to construct a joint to form a concrete footing on top of a hollow pile that is supported on the ground and transmits the load of the structure. For this purpose, a steel bar fixing step (S00) of fixing the lower end of the PC steel bar 300 to the first fixture 310 fixed to the head 100 of the pile so that the PC steel bar 300 is provided upright; The insertion body portion 111 of the rotation support 110 manufactured by casting is inserted into the inner circumferential surface of the upper end of the head portion 100 and fixed so that the head portion 112 is exposed upward, but the head portion 112 has a curved rolling A surface 112a is formed, a support surface 112b flat with a predetermined area is formed on the upper end of the curved rolling surface 112a, and a cylindrical guide pin 113 is formed at the upper end of the center of the head portion 112 ) is protrudingly formed to penetrate the PC steel bar 300; And a fastener fixing step (S12) of fastening and fixing to the insertion body portion 111 by providing a fastener 121 to penetrate the ring plate 120 formed on the outer circumferential surface of the head 100; (S10); A share key 220 made by casting is provided on the top of the head 100 so that a seating groove 230 is formed at the bottom, but a through hole 221 is formed in the center of the share key 220 to form the PC steel bar ( 300) is passed through, and a formwork is formed on the top of the pile, and a curved housing surface 231 is formed in the seating groove 230 in a shape corresponding to the curved rolling surface 112a, and the guide pin ( 113), a guide groove 240 with an extended through hole 221 is formed to prevent mutual separation due to excessive displacement during the hinge behavior process, and the second fixture 320 is attached to the PC steel bar 300 ) Formwork forming step (S20) coupled to the top of; And a footing forming step (S30) of pouring concrete into the formwork to embed the share key 220.

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According to the joint between the footing and the pile capable of hinged behavior and the construction method thereof, the rotation support provided at the top of the head of the pile is seated in the head groove formed in the support of the footing and rotation occurs according to the horizontal load Even on the basis of rolling between the rotation support and the head groove, the hinge behavior can be implemented.

In addition, based on the process of providing the rotation support to the head groove, workability can be improved and a more stable joining structure can be formed.

Furthermore, since it can be applied to any hollow pile with an empty inside, such as steel pipe, concrete, PHC pile, it is universal and has the advantage of easy design.

In particular, a share key having a seating groove formed therein is formed in the head groove, and a rotating support is provided in the seating groove, thereby preventing fatigue failure due to hinge behavior and improving durability.

In addition, since a curved rolling surface is formed on the head portion, a more effective hinge behavior can be expected.

In addition, by providing a sealing material between the seating groove of the share key and the rolling surface of the head part, it is possible to prevent an air gap so that foreign substances do not interfere with the hinge behavior.

Furthermore, a ring plate is formed on the outer circumferential surface of the upper end of the head to effectively resist horizontal load and moment load, to prevent head damage due to driving by reinforcing the head, and to fasten with the rotating support to provide structurally solid fixing force can be secured

Depending on the embodiment, both ends of the PC steel bar are coupled to the first fixture fixed to the head and the second fixture embedded and fixed to the support, respectively, and the side reaction force caused by the moment load caused by the horizontal load and the asymmetric vertical load It can also effectively resist the resulting vertical reaction force.

In addition, the joint between the footing and piles capable of hinged behavior of the present invention can be applied to pile foundations such as high-rise buildings or long-span bridges subjected to strong seismic loads or wind loads, and harbor facilities and hydraulic structures that resist asymmetrical pressure. .

In addition, it is possible to provide a joint between a footing and a pile capable of a hinge behavior that is safe, economical, and rationally designed.

1 is a cross-sectional view showing a junction between a pile and a foundation according to the prior art.
Figure 2 is a conceptual diagram showing a mechanical structure generated at the junction of the pile and the foundation by the horizontal force.
Figure 3 is a cross-sectional view showing a joint between a footing and a pile capable of hinge behavior according to an embodiment of the present invention.
Figure 4 is a cross-sectional perspective view showing a joint between a footing and a pile capable of hinge behavior according to an embodiment of the present invention.
5 is a conceptual diagram showing the principle of the hinge behavior of the present invention.
6 is a cross-sectional view showing a joint between a footing and a pile capable of hinge behavior according to another embodiment of the present invention.
Figure 7 is a cross-sectional perspective view showing a joint between a footing and a pile capable of hinge behavior according to another embodiment of the present invention.
8 and 9 are cross-sectional views showing junctions between footings and piles according to various embodiments of the present invention.
10 is a cross-sectional view showing a joint between a footing and a pile capable of hinge behavior according to another embodiment of the present invention.
11 is a conceptual diagram of a basic system using the present invention.
12 is a block diagram showing the time-sequential sequence of the joint construction method of the present invention.
Figure 13 is a cross-sectional view visually showing the sequence of the junction construction method of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following examples. This embodiment is provided to more completely explain the present invention to those skilled in the art.

As shown in FIG. 3, the present invention relates to a joint (J) of hollow piles that supports a concrete footing formed under a structure and transmits a load to the ground, and horizontal load such as wind or earthquake and uneven subsidence of the ground It is to propose a joint (J) that can effectively hinge to the rotational force caused by a moment load such as

On the other hand, the hollow pile (P) of the present invention can be applied to any hollow pile having a hollow inside, such as a general steel pipe, hollow concrete pipe, PHC pile, etc., so it is universal and has the advantage of easy design. In addition, the concrete footing (F) is reinforced with foundation reinforcement (R), and after installing the formwork adjacent to the head 100 of the pile (P) and reinforcing the foundation reinforcement (R) on top of the formwork, It is formed by pouring and curing.

However, as shown in FIG. 2, since a strong moment is generated at the top of the pile when a horizontal load occurs, in constructing a pile of a structure with frequent horizontal load, in order to effectively control this, hinge behavior according to rotation is possible It is desirable to design

To this end, as shown in FIGS. 3 and 4, the present invention supports the support part 200 of the footing F on the head 100 of the pile P, and rotates at the top of the head 100. The support 110 is provided and seated in the head groove 210 formed in the support 200 of the footing. As a result, as shown in FIG. 5 , even when rotation occurs according to a horizontal load, an effective hinge behavior can be realized based on rolling between the rotation support 110 and the head groove 210 .

In addition, the workability can be further improved based on the process of providing the rotation support 110 to the head groove 210 of the support part 200, and the rotation support 110 is seated in the head groove 210 Therefore, a stable junction structure can be formed. The rotating support 110 is preferably made of cast iron or cast steel, thereby preventing fatigue failure, which can easily be caused to concrete by various loads, and improving durability.

Furthermore, the lower surface of the foot F is formed lower than the upper end of the head 100 by the head groove 210 formed in the lower part of the support 200, thereby providing a structurally more stable joint J. In addition, since the formwork structure can be formed efficiently during the construction process, the advantage of improving workability is exhibited.

In particular, a share key 220 may be formed in a shape corresponding to the head groove 210, and a seating groove 230 may be formed below the share key 220. The share key 220 is preferably made of cast iron or cast steel, and the seating groove 230 similarly functions so that the rotation support 110 coupled to the head 100 is stably seated. The share key 220 can prevent fatigue failure of the support part 200 due to hinge behavior and further improve durability.

On the other hand, according to the embodiment, the rotation support 110 is integrally formed with a head portion 112 supporting the support portion 200 on the upper portion of the insertion body portion 111 inserted and fixed to the inner circumferential surface of the head portion 100 Structural stability and durability can be expected by securing a strong bonding force with the head 100 and at the same time supporting the support portion 200 with the head portion 112 protruding upward from the head portion 100.

At this time, the insertion body 111 may be fastened and fixed via a fastener 121 penetrating the ring plate 120 to be described later so that it can be stably inserted and fixed to the inner circumferential surface of the head 100.

In particular, as shown in FIGS. 3 to 5, a curved rolling surface 112a is formed on the head portion 112 of the rotation support 110, and the footing F supported by the support portion 200 is horizontal load The ideal hinge behavior can be realized by making it rotate more effectively by the moment load.

At this time, the seating groove 230 of the share key 220 formed at the lower end of the support part 200 also has a curved housing surface 231 formed in a shape corresponding to the rolling surface 112a of the head part 112. At the same time as guiding so that a stable hinge behavior is achieved, it is possible to prevent the rotation support 110 of the head 100 from being separated from the seating groove 230 due to excessive displacement.

In addition, as shown in FIG. 8, a guide pin 113 protrudes from the upper center of the head part 112, and a guide groove at a position corresponding to the lower seating groove 230 of the share key 220 ( 240) is formed to prevent mutual separation due to excessive displacement in the hinge behavior process. In particular, in an embodiment in which the PC steel bar 300 to be described later is additionally provided, the through hole 221 may replace the guide groove 240, and at this time, the guide pin 113 is a cylinder through which the PC steel bar 300 penetrates. can be a shape.

Depending on the embodiment, as shown in FIG. 9, a sealing material 232 is provided between the seating groove 230 of the share key 220 and the rolling surface 112a of the head part 112 to prevent an air gap. It can be implemented so that foreign matter does not flow in between the seating groove 230 and the head part 112 to cause interference with the hinge behavior.

Furthermore, as shown in FIGS. 6 and 7, the head portion 112 exposed to the upper portion of the rotating support 110 has a flat receiving surface 112b by a predetermined area as the upper end of the curved rolling surface 112a. ) can be formed. The supporting surface 112b is to prevent cracks of the supporting part 220 from being caused or structurally weakened as the load transmitted by the supporting part 200 of the foot F is locally concentrated, but the supporting surface 112b Depending on the area of (112b), it may be difficult to implement the original hinge behavior, so it is preferable not to form an excessively excessive area.

Meanwhile, as shown in FIGS. 6 and 7 , a ring plate 120 may be formed on an outer circumferential surface of the top of the head 100 . A shear reinforcing material such as a stud bolt is integrally formed on the inner circumferential surface of the ring plate 120 to further improve attachment performance, and since the ring plate 120 is formed on the top of the head 100, horizontal load and moment load It can effectively resist, and by reinforcing the head 100, it is possible to prevent head damage due to driving.

In addition, by using the fastener 121 penetrating the ring plate 120 so that the insertion body 111 inserted and fixed to the inner circumferential surface of the head 100 can be stably fixed, the rotation support 110 It is possible to fasten and fix the insertion body portion 111 of the.

On the other hand, horizontal reaction force and negative reaction force and vertical reaction force corresponding to the negative reaction force may be additionally generated in piles in symmetrical positions due to additional horizontal load or asymmetric vertical load applied to the piles supporting the vertical load of the structure. At this time, when a negative reaction force is generated in the pile, a tensile stress is formed in the joint part J in a direction in which it is temporarily separated from the ground.

For this reason, a PC steel bar 300 may be additionally provided upright between the head 100 and the support 200 as shown in FIG. 10 in the joint portion J of the present invention. The PC steel bar 300 functions as a tension member for stress caused between the head 100 and the support 200. At this time, the PC steel bar 300 can be manufactured in various diameters according to the design conditions of the site, and it is preferable to manufacture a coating layer formed on the outer circumferential surface so as to effectively resist the negative reaction force.

In particular, both ends of the PC steel bar 300 may be coupled to the first fixture 310 fixed to the head 100 and the second fixture 320 buried and fixed to the support part 200, respectively. Male threads are formed at both ends of the PC steel bar 300, and a nut structure having female threads is formed at the first and second fixtures 310 and 320 so that the coupling is easy to fix but not easily dismantled by vibration or the like. production is preferred.

On the other hand, the second fixture 320 is embedded and fixed in the concrete due to the nature of the support 200 formed by pouring concrete. Preferably, the first fixture 310 is also provided in the hollow part of the head 100. It can be embedded and fixed in concrete.

In addition, as shown in FIGS. 6 and 7 , a corrugated steel pipe 130 having excellent toughness and rigidity may be provided on the inner circumferential surface of the hollow part of the head 100 . The corrugated steel pipe 130 may be a corrugated steel pipe, and it is possible to prevent crack exfoliation and local destruction that may be caused by a concentrated load applied to the head 100 by the corrugated steel pipe 130. In addition, it is possible to prevent pulling out due to tensile stress applied to the PC steel bar 300 and to maximize the fixing effect.

In particular, the corrugated steel pipe 130 can maximize the surface area with the concrete cast on the outer circumferential surface in the process of manufacturing the concrete or pile (P) cast in the hollow, and diversify the direction of stress corresponding to the load, Depending on the embodiment, shear reinforcing materials such as stud bolts are integrally formed on the outer circumferential surface of the corrugated steel pipe 130 to further improve attachment performance.

In order to manufacture the hollow pile (P) described above as a concrete pile or a PHC pile, in a form having inner and outer surfaces for forming the pile, a corrugated steel pipe such as a corrugated steel pipe on one inner surface forming the head. After arranging the corrugated steel pipe 130, a plurality of horizontal reinforcing bars 140 are provided to penetrate the corrugated steel pipe 130, and a ring plate 120 is provided on the outer surface of one side forming the head, and then tensile reinforcement is performed. Equipped with reinforcing bars or steel wire for pouring concrete. Then, by rotating and curing the foam, it is possible to manufacture the hollow pile P on which the tofu 100 of the present invention is formed.

On the other hand, the reinforcing bars 400 are provided so that the PC steel bar 300 is arranged around the second fixture 320 from the bottom and supported by the foundation reinforcing bars R attached to the support 200 at the same time can More specifically, the reinforcing bar 400 is formed in a triangular structure to support the second fixture 320 from the bottom, distributing the compressive force of the PC steel bar 300 acting on the inside of the footing F to the foundation reinforcing bar R. By passing, it is possible to form an ideal coupling structure of the footing (F) and the pile (P).

Thus, as shown in FIG. 11, the joint (J) between the footing (F) and the pile (P) disposed in the center is implemented as a conventional rigid structure of the footing (F) and the pile (P) to form a fixed end. However, the junction (J) of the footing (F) and the pile (P) located on both sides forms a hinge end so that the hinge behavior is possible, and the junction (J) of the footing (F) and the pile (P) disposed on the outermost side ) can implement a hinge end capable of controlling the negative reaction force by providing a PC steel bar 300 so that the negative reaction force due to the moment load caused by the horizontal load and the asymmetric vertical load can be controlled together.

In other words, it is possible to form an efficient pile foundation structure by appropriately forming various types of junctions (J) depending on the location, and considering the geometric conditions of the footing (F) such as wind, earthquake, earth pressure, and water pressure, rather than a standardized design technique Since a system that rationalizes the performance of the structure can be proposed, the advantage of reducing the size of the footing (F) and reducing the length and number of piles (P) is exhibited.

On the other hand, the joint construction method (M) of the present invention is for forming a concrete footing (F) on top of a hollow pile (P) that is supported on the ground and transmits the load of the structure, as shown in FIGS. 12 and 13 As described above, it may include a support fixing step (S10), a mold forming step (S20), and a footing forming step (S30).

The support fixing step (S10) is a step of inserting the insertion body portion 111 of the rotation support 110 into the upper inner circumferential surface of the head 100 of the pile and fixing the head portion 112 to be exposed upward, It may include a supporter insertion step (S11) and a fastener fixing step (S12).

The support insert step (S11) is a step of inserting the insertion body 111 of the rotation support 110 into the upper inner circumferential surface of the head 100, the outer circumferential surface of the rotation support 110 is provided with a sealing material It is possible to seek a tight connection with the inner circumferential surface of the pile (P).

In addition, the fastener fixing step (S12) is a step of fastening and fixing to the insertion body portion 111 by providing a fastener 121 to pass through the ring plate 120 formed on the outer circumferential surface of the head 100, the insertion A fastening hole is formed in the body portion 111 to form a stable coupling structure of the rotation support 110 based on the fastening with the fastener 121 .

The formwork forming step (S20), which proceeds thereafter, is a step of forming a formwork on top of the pile (P) to form a footing (F) and reinforcing the foundation reinforcement (R), and in detail, the share key preparation step (S21 ) and a basic reinforcement step (S22).

The share key preparing step (S21) is a step of providing the share key 220 to the inside of the formwork so that the support portion 200 is embedded, and a seating groove 230 is formed at the bottom of the share key 220 so that the head ( 100) to be settled. In particular, it is preferable that a plurality of shear reinforcing materials such as stud bolts are formed on the outer circumferential surface of the share key 220 to secure adhesion performance with concrete to be cast later. Then, based on the basic reinforcement step (S22), the reinforcement reinforcement (R) is placed inside the formwork.

The next footing forming step (S30) is a step of forming the share key 220 by embedding concrete by pouring concrete into the formwork. Thus, in a state in which the share key 220 is embedded between the head 100 and the support portion 200, the rotation support 110 is provided in the seating groove 230 provided below the share key 220, thereby providing horizontal load It can effectively hinge the displacement and moment caused by In addition, it is possible to provide a joint between a footing and a pile capable of safe, economical and reasonable hinge behavior.

On the other hand, depending on the embodiment, the steel rod fixing step (S00) of fixing the lower end of the PC steel rod 300 to the head 100 of the pile so that the PC steel rod 300 is provided upright before the support fixing step (S10) ; may be further included.

In the steel bar fixing step (S00), the first fixture 310 is coupled to one end of the PC steel bar 300 to be fixed to the head 100 of the pile, and after placing a plurality of horizontal reinforcing bars 140, The first fixture 310 may be seated. At this time, a through hole is formed in the support 110 so that the PC steel bar 300 passes through, and the PC steel bar 300 can be coupled and fixed to the head 100 to pass through.

In addition, the second fixture 320 coupled to the top of the PC steel beam may be coupled to the PC steel bar 300 in advance, but may be performed after the basic reinforcement step (S22) of the formwork forming step (S20).

In the above, the embodiments of the joint (J) of the footing and the pile capable of hinge behavior of the present invention have been described and described, but those skilled in the art are within the range that does not deviate from the spirit of the present invention described in the claims The present invention can be variously modified and changed by adding, changing, deleting or adding components within the scope of the present invention, which will also be said to be included in the scope of the present invention.

Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description is omitted. In addition, the terms used are terms defined in consideration of functions in the embodiments of the present invention, which may vary according to the intention or relationship of the user or operator. Therefore, the definition should be made based on the contents throughout this specification. Accordingly, the above detailed description of the invention is not intended to limit the invention to the disclosed embodiments, and the appended claims should be construed to include other embodiments as well.

F: Putting P: File
J: junction 100: head
110: rotation support 111: insertion body
112: head portion 112a: rolling surface
112b: receiving surface 113: guide pin
120: ring plate 130: corrugated steel pipe
140: horizontal reinforcing bar 200: support
210 Tofu home 220 Share key
230: seating groove 231: housing surface
232: sealing material 240: guide groove
300: PC steel bar 310: first fixture
320: second fixture 400: reinforcing bar
M: Joint construction method
S00: steel rod fixing step S10: support fixing step
S20: formwork forming step S30: footing forming step

Claims (13)

It relates to a joint (J) of a hollow pile that supports a concrete footing formed under a structure and transmits a load to the ground,
At the top of the head 100 of the pile, a cast-made rotary support 110 is provided, and a head groove 210 is formed at the support 200 of the footing, so that the head groove 210 is cast in a corresponding shape. A share key 220 is formed, and a seating groove 230 is formed and supported at the bottom of the share key 220 so that the rotation support 110 is seated and provided.
In the rotation support 110, the head portion 112 supporting the support portion 200 is integrally formed on the upper portion of the insertion body portion 111 inserted and fixed to the inner circumferential surface of the head portion 100, the head portion 112 ), a curved rolling surface 112a is formed, and a flat support surface 112b with a predetermined area is formed at the upper end of the curved rolling surface 112a, and the seating groove 230 has a curved surface in a corresponding shape A mold housing surface 231 is formed,
A ring plate 120 is formed on the outer circumferential surface of the top of the head 100, and a fastener 121 penetrating the ring plate 120 is provided to insert the body 111 of the rotation support 110. fastened and fixed,
The PC steel bar 300 is provided upright by penetrating the rotation support 110 of the head 100 and the through hole formed in the center of the share key 220 of the support 200, the amount of the PC steel bar 300 The ends are coupled to the first fixture 310 fixed to the head 100 and the second fixture 320 embedded and fixed to the support 200, respectively.
A guide pin 113 protrudes from the upper center of the head part 112, and a guide groove 240 with a through hole 221 extended at a position corresponding to the lower seating groove 230 of the share key 220. ) is formed to prevent mutual separation due to excessive displacement during the hinge behavior process, and the guide pin 113 is formed in a cylindrical shape so that the PC steel bar 300 penetrates. Footing and piles capable of hinge behavior, characterized in that junction of .
delete delete delete delete delete delete delete delete delete It relates to a construction method (M) of a joint (J) forming a concrete footing on top of a hollow pile supported on the ground and transmitting the load of a structure,
A steel bar fixing step (S00) of fixing the lower end of the PC steel bar 300 to the first fixture 310 fixed to the head 100 of the pile so that the PC steel bar 300 is provided upright;
The insertion body portion 111 of the rotation support 110 manufactured by casting is inserted into the inner circumferential surface of the upper end of the head portion 100 and fixed so that the head portion 112 is exposed upward, but the head portion 112 has a curved rolling A surface 112a is formed, a support surface 112b flat with a predetermined area is formed on the upper end of the curved rolling surface 112a, and a cylindrical guide pin 113 is formed at the upper end of the center of the head portion 112 ) is protrudingly formed to penetrate the PC steel bar 300; And a fastener fixing step (S12) of fastening and fixing to the insertion body portion 111 by providing a fastener 121 to penetrate the ring plate 120 formed on the outer circumferential surface of the head 100; (S10);
A share key 220 made by casting is provided on the top of the head 100 so that a seating groove 230 is formed at the bottom, but a through hole 221 is formed in the center of the share key 220 to form the PC steel bar ( 300) is passed through, and a formwork is formed on the top of the pile, and a curved housing surface 231 is formed in the seating groove 230 in a shape corresponding to the curved rolling surface 112a, and the guide pin ( 113), a guide groove 240 with an extended through hole 221 is formed to prevent mutual separation due to excessive displacement during the hinge behavior process, and the second fixture 320 is attached to the PC steel bar 300 ) Formwork forming step (S20) coupled to the top of; and
A footing forming step (S30) of pouring concrete into the formwork to form a buried share key 220;
A method for constructing a junction between a footing and a pile capable of hinge behavior, characterized in that it comprises a. delete delete

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