KR101088788B1 - Vibration damping pile structure using vibration damping pile cap and permanent tension member - Google Patents

Abstract

PURPOSE: A seismic isolation pile structure using a seismic isolation pile cap and a permanent tension member is provided to reduce construction time and costs because an additional design change is not required. CONSTITUTION: A seismic isolation pile structure using a seismic isolation pile cap and a permanent tension member comprises a pile(P), a seismic isolation pile cap, a footing block, and a permanent tension member(T). The pile is buried in the ground and has a hollow. The seismic isolation pile cap is installed in the head of the pile and has a vibration-proof pad(20). The footing block is installed on the top of the seismic isolation pile cap. The permanent tension member is installed in the hollow of the pile through the footing block and the seismic isolation pile cap.

Description

Vibration Damping Pile Structure Using Vibration Damping Pile Cap And Permanent Tension Member}

The present invention relates to a seismic pile structure that can be applied in addition to the existing pile method at low cost without additional design change in forming a seismic isolation structure for earthquake in the construction process of a building, and is easy to use even for unskilled workers. And a seismic pile structure using a seismic pile cap and a permanent tension member free to install and dismantle.

Unlike in the past, in recent years, earthquakes occur frequently around the world, including in Korea, and as the damage increases, the need for earthquake or seismic isolation in buildings is increasing.

In the case of new buildings, seismic design and seismic design are performed for MDU and high-rise buildings, respectively, but the general buildings other than MDU and high-rise buildings lack earthquake preparedness in almost all buildings except for some.

Even if seismic design or seismic design is applied, the existing seismic or seismic isolation structure and construction method increase the material strength of structure or install expensive seismic isolation device, which makes designing difficult and requires a long construction period and cost. There is this.

Therefore, it is urgent to develop an inexpensive base isolation structure that can maximize the base isolation effect with a simple structure that is added without additional design changes to the existing building.

In this context, various base isolation pile structures are used in recent years.

1 illustrates the behavior of a conventional structure and a base isolation pile structure with respect to a load, and FIG. 2 is an enlarged view of the behavior of the base isolation pile structure in FIG. 1.

Specifically, Figure 1 (a) is a state of balance of the load is stable, Figures 1 (b) and (c) is the behavior of the structure against the eccentricity of the load due to the moment generated from the horizontal load such as earthquake and the load acting from the top It is shown.

Generally, (1) When the friction pile is applied when the ground is soft ground, there are some differences depending on the groundwater level when horizontal loads such as earthquakes occur. However, due to the temporary liquefaction of the ground, the friction pile loses its function and the settlement and collapse of the structure Can happen.

(2) The stress of both sides of the foundation pile of the structure is unbalanced, so the structure is inclined and eccentric moment is generated by the movement of the center of gravity.

(3) In the case of tip supporting piles where the tip of foundation pile touches hard rock (base rock), it can be reliably used in low-level structures, but for high structures such as high-rise buildings, bridge towers, piers, etc. This occurs and the tensile stress is generated at the opposite side of the inclined point, which becomes unstable due to the characteristics of the end support pile that is not considered tensile force.

(4) In the case of the lower ground support piles whose tip of the foundation pile is incorporated into the bedrock to resist the tensile force, the compressive force and the bearing force (resistance due to the load) are stable, but as shown in Figs. Higher structures, such as bridge piers, are more likely to fall due to piles and seismic devices that do not consider tensile forces and tensile stresses on opposite sides of loads.

In conclusion, the existing pile and seismic isolator is designed considering only the compressive force. Therefore, the existing structure must have a separate fall prevention device and structure in addition to the existing pile and the seismic isolator. It is becoming.

Therefore, it is urgent to develop a structure that provides tensile performance to existing pile and base isolation devices.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art. The purpose is as follows.

First, to provide a seismic pile structure using a seismic pile cap and a permanent tension member that can be applied to existing piles and foundation blocks so as to have a tensile performance corresponding to the lateral load without additional design changes.

Second, to provide a seismic pile cap using a simple structure and a seismic pile cap and a permanent tension member is easy to install and less damage.

Third, to assemble the dry and ready-made member to provide a seismic pile structure using a seismic pile cap and a permanent tension member that can obtain excellent seismic effect and tensile effect even if the unskilled hole is installed.

Fourth, since there is no need for a separate design change and the structure is simple, it is intended to provide an economically isolated pile cap and a seismic pile structure using a permanent tension member that can reduce air and aerobics.

In order to solve the above technical problem, the present invention provides a seismic isolation structure,

A pile (P) having hollows embedded or driven in the ground; A base isolation pile cap (C) having a dustproof pad (20) installed inside the head of the pile (P); A base block (B) installed on an upper portion of the base isolation pile cap (C); And, it is installed in the hollow of the pile (P) to vertically penetrate the base block (B) and the base isolation pile cap (C) one end is fixed to the hollow of the pile (P) and the other end of the base block (B) It provides a base isolation pile structure using a base isolation pile cap and a permanent tension member, characterized in that it comprises a;

In addition, the base isolation pile cap (C) has a hollow is formed in the center and the lower support 10 is installed on the upper head of the pile (P); Hollow is formed in the center and the anti-vibration pad 20 is installed on the upper portion of the lower support (10); A hollow is formed in the center and the upper support 30 is installed on the top of the anti-vibration pad 20; The upper cover 51 is formed in the center and installed on the upper portion of the upper support 30 with a diameter larger than the upper support 30; A protective tube 52 attached to a lower circumferential surface of the upper cover 51 in a cylindrical shape as a whole, and installed so that the lower end of the vertical surface falls below the head of the pile P; And a plurality of stud bolts 40 which are vertically bonded to the upper portion of the upper support 30 through the upper cover 51 and the upper portion is embedded in the lower portion of the base block B.

The lower support 10 has a pad guide 12 having a size on which the dustproof pad 20 can be mounted on an upper portion and a lower portion thereof, and a pile guide 14 having a size that can be inserted into the hollow of the pile P. ) Is formed,

The permanent tension member (T) is a base isolation pile cap and permanent tension member, characterized in that through the hollow formed in the center of each of the lower support 10, the anti-vibration pad 20, the upper support 30, the upper cover 51 Provides base isolation file structure using.

According to the present invention, the following effects are expected.

First, to provide a seismic pile structure using a seismic pile cap and a permanent tension member that can be applied to existing piles and foundation blocks so as to have a tensile performance corresponding to the lateral load without a separate design change.

Second, it provides a seismic pile structure using a simple seismic pile cap and permanent tension member because the structure is simple and easy to install.

Third, assembling dry and ready-made members provides a seismic pile structure using a seismic pile cap and a permanent tension member which can obtain excellent seismic effect and tensile effect even if unskilled workers are installed.

Fourth, since there is no need for a separate design change and the structure is simple, it provides an economically isolated pile cap and a permanent pile material that can reduce air and aerobics.

1 shows the behavior of a conventional structure and a seismic pile structure against a load.
2 is an enlarged view of the behavior of the base isolation pile structure of FIG. 1.
3 is a cross-sectional view of a base isolation pile structure using a base isolation pile cap and a permanent tension member of the present invention.
4 is an exploded perspective view of a base isolation pile structure using the base isolation pile cap and the permanent tension member of the present invention.
Figure 5 illustrates the behavior of the base isolation pile structure using the base isolation pile cap and the permanent tension member of the present invention when the load is concentrated on the left side of the structure.
Figure 6 illustrates the behavior of the base isolation pile structure using the base isolation pile cap and the permanent tension member of the present invention when the load is concentrated in the center of the structure.
Figure 7 illustrates the behavior of the base isolation pile structure using the base isolation pile cap and the permanent tension member of the present invention when the load is concentrated on the right side of the structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1. Isolation Pile cap  everlasting Tension  Base isolation file structure

3 is a cross-sectional view of a base isolation pile structure using a base isolation pile cap and a permanent tension member of the present invention, Figure 4 is an exploded perspective view of a base isolation pile structure using a base isolation pile cap and a permanent tension member of the present invention.

The base isolation pile structure using the base isolation pile cap and the permanent tension member of the present invention is a base isolation pile structure,

A pile (P) having hollows embedded or driven in the ground; A base isolation pile cap (C) having a dustproof pad (20) installed inside the head of the pile (P); A base block (B) installed on an upper portion of the base isolation pile cap (C); And, it is installed in the hollow of the pile (P) to vertically penetrate the base block (B) and the base isolation pile cap (C) one end is fixed to the hollow of the pile (P) and the other end of the base block (B) Permanent tensile material (T) is fixed to the); characterized in that comprises a.

The pile (P) is a hollow concrete pile, such as PC, PHC will be mainly used, but in general, it can be used for cast-in-place concrete pile or steel member.

The base isolation pile cap (C) is installed on the head of the pile (P) having a dustproof pad 20 therein,

The base isolation pile cap (C) is a hollow bottom is formed in the center and the lower support 10 is installed on the upper head of the pile (P); Hollow is formed in the center and the anti-vibration pad 20 is installed on the lower support 10; A hollow is formed in the center and the upper support 30 is installed on the top of the anti-vibration pad 20; The upper cover 51 is formed in the center and installed on the upper portion of the upper support 30 with a diameter larger than the upper support 30; A protective tube 52 attached to a lower circumferential surface of the upper cover 51 in a cylindrical shape as a whole, and installed so that the lower end of the vertical surface falls below the head of the pile P; And a plurality of stud bolts 40 which are vertically bonded to the upper portion of the upper support 30 through the upper cover 51 and the upper portion is embedded in the lower portion of the base block B.

The lower support 10 has a pad guide 12 having a size on which the dustproof pad 20 can be mounted on an upper portion and a lower portion thereof, and a pile guide 14 having a size that can be inserted into the hollow of the pile P. ), It is preferable to use steel which is formed more and there is no fear of corrosion. The lower support 10 is installed after arranging the head of the pile (P), as shown in Figure 3 and 4, the size or diameter that can be mounted on the upper and lower dustproof pad 20, respectively; An excitation pad guide 12 and a pile guide 14 having a size or diameter that can be inserted into the hollow of the pile P may be further formed. When the horizontal vibration is generated due to an earthquake or the like, the pad guide ( 12) and the pile guide 14 serves to prevent the dust pad 20 and the pile P from being separated from the lower support 10, respectively.

The inner diameter of the pad guide 12 has a minimum clearance and is slightly larger than the outer diameter of the dustproof pad 20, and the outer diameter of the pile guide 14 is slightly smaller than the inner diameter of the pile P with a minimum clearance. .

In addition, since the lower support 10 receives a shear stress that resists horizontal vibration, the thickness is preferably to have sufficient rigidity and thickness through structural examination, and to be coated with an antirust paint to prevent corrosion.

The anti-vibration pad 20 is generally installed on the lower support 10 in a cylindrical shape, and uses a general seismic isolation pad used for bridges and the like. Preferably, the thickness can be freely set to an appropriate level according to the vibration width due to the earthquake and the tip bearing capacity of the pile (P).

The upper support 30 is generally installed on the top of the anti-vibration pad 20 in the form of a hollow disk, mainly using a steel plate as a steel material for the transmission and vibration absorption of the load from the structure to the top of the anti-vibration pad 20 The thickness should be sufficient. In addition, the following stud bolts 40 are fixed by welding or screwing. In addition, the thickness of the upper support 30 is preferably to have a sufficient stiffness and thickness through a structural examination, it is preferable to coat with rust preventive paint or the like to prevent corrosion.

The protective tube 52 is generally attached to the lower circumferential surface of the upper cover 51 in the shape of a cylinder, but is installed so that the lower end of the vertical surface is lower than the head of the pile (P), the upper cover ( 51 may be integrally formed with the protective cap 50 or may be integrally formed with the upper support 30. The protective tube 52 may be made of the same material as the upper cover 51 and the upper support 30 or may be integrally formed, and the upper cover 51 or the upper support 30 is installed in a formwork. Reinforced concrete in one state may be manufactured integrally with the upper cover 51 or the upper support (30).

The stud bolt 40 is vertically bonded to the upper portion of the upper support 30 through the upper cover 51, the upper portion is integrally constructed in the lower portion of the base block (B) is embedded a plurality of.

In addition, the isolation pile cap (C) is a protective cap spacer 60 is installed on the outer circumferential surface of the vertical tube of the protective tube 52 in the upper and lower portions as a whole open; And a pad protector 70 installed in a gap between the lower inner circumferential surface of the protective cap 50 and the main head of the pile P. The protection cap 50 may be further configured.

The protective cap spacer 60 is generally installed on the outer circumferential surface of the vertical surface of the protective cap 50 in the upper and lower portions of the cylindrical shape, using a material similar to the anti-vibration pad 20 with good durability and elasticity It is preferable. The protective cap spacer 60 functions to secure a space for absorbing the vibration of the ground (including the rubble layer) transmitted to the protective cap 50 and the upper portion of the protective cap spacer 60 is formed on the base block (B). The lower portion of the protective cap spacer 60 is attached to the lower surface of the protective cap 50 so as to secure the vibration absorbing space by vertical and horizontal vibrations.

The pad protector 70 is installed in the gap between the lower inner circumferential surface of the vertical surface of the protective cap 50 and the head of the pile P, and is provided in the gap between the upper side surface of the pile P and the protective cap 50. To prevent the mixing of soil, rubble, etc. is installed to ensure an active space due to the vibration of the pile (P) head side and the protective cap 50 when the vibration occurs. As a material, it is preferable to use a JOINT FILLER of a structure having good durability and good space-saving effect.

The permanent tension member (T) is installed in the hollow of the pile (P) by vertically penetrating the base block (B) and the base isolation pile cap (C), one end is fixed to the hollow of the pile (P) and the other end is To be fixed to the base block (B),

At this time, the lower support 10, the anti-vibration pad 20, the upper support 30, the upper cover 51 are all formed in the hollow so that the permanent tension member (T) through each of the center and the hollow Permanent tension member (T) is installed through.

The permanent tension member T may be used by twisting a stranded wire used when fabricating a conventional PC, or may use an earth anchor, a soil nail, or the like, if necessary. In addition, the permanent tension member (T) is preferably fixed to the hollow of the pile (P) by a grouting (grouting) method for securing the tensile force. The other end of the permanent tension member (T) is fixed through the base block (B) in the usual way inside or above the base block (B), in which the tensile force is not applied according to the on-site assessment and design document Tensile force may be applied in advance to fix it.

The length of the free field and the anchorage of the permanent tension member (T) should be carefully calculated and carefully calculated in consideration of the load, characteristics and settlement of the structure, the stress generated in the permanent tension member (T) in case of falling risk.

Figure 5 shows the behavior of the base isolation pile structure using the seismic isolation pile cap and the permanent tension member of the present invention when the load is concentrated on the left side of the structure, Figure 6 is the isolation pile of the present invention when the load is concentrated in the center of the structure The behavior of the base isolation pile structure using the cap and the permanent tension member is shown, and FIG. 7 illustrates the behavior of the base isolation pile structure using the base isolation pile cap and the permanent tension member when the load is concentrated on the right side of the structure.

All members, such as pile P used for this invention, are excellent in strength since various loads (weight of upper structure, horizontal load, live load, etc.) and the axial force of the said permanent tension member T act.

5 to 7, the permanent tension member T has a large variation in stress due to irregular loads (centrifugal force, wind load, earthquake vibration, etc.) due to vibration, and thus the free length of the permanent tension member T. To design the free field as short as possible to minimize the amount of elongation, (1) When the load is increased directly on the top, the tensile force is to be sharply reduced to increase the stress of the anti-vibration pad (20). (2) When the load is moved to the opposite side and the load is directly reduced or extinguished, the compressive stress of the anti-vibration pad 20 is extinguished and the tensile force of the permanent tensile member T is rapidly increased to cover all the tensile stress. It is stabilized by restoring the structure.

2. Isolation Pile cap  everlasting Tension  Construction method of base isolation pile structure using

An embodiment of a construction method of a base isolation pile structure using a base isolation pile cap and a permanent tension member is as follows.

(1) The head P of the pile P is arranged after being checked (height of the cut surface, flatness, coating state of the steel wire cut surface, etc.) and the space state inside the pile P.

(2) Fill or seal the inside of the pile P to a predetermined depth according to the length of the permanent tension member T.

(3) When the inner length of the pile (P) is secured, insert and grout the permanent tension member (T).

(4) When the curing of the grout is completed, the lower support 10 is installed on the head of the pile P, but one end of the permanent tension member T passes through the hollow of the lower support 10.

(5) the dustproof pad 20, the upper support 30 so that the permanent tension member T passes through the hollow formed at the center of the dustproof pad 20, the upper support 30, and the upper cover 51, respectively. It is installed while maintaining the central axis of the upper cover (51).

(6) Complete the assembly of the other members and fill all the gaps with silicon, etc., so that impurities such as concrete should not be introduced during the concrete placement of the structure including the foundation block (B).

(7) When assembling the reinforcing bar of the basic block (B), the sheath pipe (sheath), etc. are installed in advance to penetrate the permanent tension member (T) to be vertically bound to the reinforcing bar and to install the anchorage in the concrete plan (tension jack installation) To secure.

(8) When concrete curing of structures such as foundation block (B) is completed (more than 80% of the design strength), the members for tensioning (pressure plate, head, wedge, etc.) are assembled and tensioned with appropriate tensile force in accordance with the design book. When the tension is completed, the permanent tensile material (T) is cut and then filled with non-shrink mortar and finishes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Therefore, the claims of the present invention include modifications and variations that fall within the true scope of the invention.

P: file
C: Isolation Pile Cap
T: Permanent Tension
B: foundation block
10: lower support
12: Pad Guide
14: File Guide
20: Dust Pad
30: upper support
40: stud bolt
50: protective cap
51: top cover
52: sheriff
60: protective cap spacer
70: pad protector

Claims (7)

delete A pile (P) having hollows embedded or driven in the ground;
A base isolation pile cap (C) having a dustproof pad (20) installed inside the head of the pile (P);
A base block (B) installed on an upper portion of the base isolation pile cap (C); And,
It is installed in the hollow of the pile (P) by vertically penetrating the base block (B) and the base isolation pile cap (C) one end is fixed to the hollow of the pile (P) and the other end to the base block (B) In the seismic isolation pile structure using a seismic isolation cap and a permanent tension member, characterized in that it comprises a;
The base isolation pile cap (C) is a hollow bottom is formed in the center and the lower support 10 is installed on the upper head of the pile (P); Hollow is formed in the center and the anti-vibration pad 20 is installed on the lower support 10; A hollow is formed in the center and the upper support 30 is installed on the top of the anti-vibration pad 20; The upper cover 51 is formed in the center and installed on the upper portion of the upper support 30 with a diameter larger than the upper support 30; A protective tube 52 attached to a lower circumferential surface of the upper cover 51 in a cylindrical shape as a whole, and installed so that the lower end of the vertical surface falls below the head of the pile P; And a plurality of stud bolts 40 which are vertically bonded to the upper portion of the upper support 30 through the upper cover 51 and the upper portion is embedded in the lower portion of the base block B.
The lower support 10 has a pad guide 12 having a size on which the dustproof pad 20 can be mounted on an upper portion and a lower portion thereof, and a pile guide 14 having a size that can be inserted into the hollow of the pile P. ) Is formed,
The permanent tension member (T) is a base isolation pile cap and permanent tension member, characterized in that penetrating through the hollow formed in the center of each of the lower support 10, the anti-vibration pad 20, the upper support 30, the upper cover 51 Base isolation file structure using.
In claim 2,
The base isolation pile cap (C) is
A protective cap spacer (60) installed on an outer circumferential surface of the protective tube (52) vertically in a cylindrical shape having an upper and a lower portion as a whole; And a pad protector 70 installed in a gap between the lower inner circumferential surface of the protective cap 50 and the vertical head of the pile P, and the head of the pile P; and a seismic isolation pile cap and a permanent tension member. File structure.
3. The method according to claim 2 or 3,
The permanent tension member (T) is seismic isolation pile structure using a seismic isolation cap and a permanent tension member, characterized in that the grouting (grouting) fixed to the hollow of the pile (P).
3. The method according to claim 2 or 3,
The permanent tension member (T) is a base isolation pile structure using a seismic isolation cap and a permanent tension member, characterized in that the fixed tension is applied in advance.
3. The method according to claim 2 or 3,
A base isolation pile cap and a base isolation pile structure using a permanent tension member, characterized in that to use the earth anchor or a nail nail as the permanent tension member (T).
3. The method according to claim 2 or 3,
The upper cover 51 and the protective tube 52 of the base isolation pile cap (C) is integrally manufactured to form a protective cap 50, characterized in that the base pile pile and seismic isolation using a permanent tension member.

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