KR100862259B1 - Anchoring apparatus and prestressed structure having the same - Google Patents

Abstract

An anchor apparatus and a prestressed structure having the same are provided to stably maintain fixing force of a tendon and prevent loss of tensible force of the tendon by allowing a fixing unit to reach a fixed position in an insertion member without breakage or deformation. An anchor apparatus(100) comprises a body unit(110), a fixing unit(120) and a buffering member(130). The body unit has an insertion member(111) through which a tendon(2) passes. The fixing unit is press-fitted into the insertion member to fix the tendon to the body unit and has a plurality of pieces. The buffering member allows the fixing unit to be press-fitted into the insertion member while surrounding the front end of the fixing unit, thereby buffering an impact applied between the inner peripheral surface of the insertion member and the front end of the fixing unit. The buffering member includes a frame forming a structure of the buffering member and buffering material provided in the frame.

Description

Anchoring Apparatus and Prestressed Structure having the same}

1 is a perspective view schematically showing a conventional anchor device

Figure 2 is an exploded cross-sectional view showing a first embodiment of the anchor device according to the present invention

Figure 3 is a perspective view showing a state in which the first embodiment of the shock absorbing member for the anchor device according to the invention installed in the fixing unit

Figure 4 is a cross-sectional view showing an embodiment of the prestressed structure is installed anchor device shown in FIG.

Figure 5a Figure 5b is a cross-sectional view showing other embodiments of the shock absorbing member for the anchor device according to the invention

6a and 6b are a perspective view and a longitudinal sectional view showing another embodiment of the shock absorbing member for the anchor device according to the present invention;

7a and 7b are cross-sectional views of the prestressed structure having other embodiments of the anchoring device according to the invention.

Explanation of symbols on the main parts of the drawings

1: structure 2: tendon

100: anchor device 110: body unit

111: insertion hole 120: fusing unit

130, 230: shock absorbing member 131: frame portion

132: shock absorber 140: base plate

The present invention relates to an anchor device used for fixing the tendon and a prestressed structure having the same, and more particularly, to an anchor device having a structure to prevent damage or deformation of the fixing unit press-fitted for fixing the tendon, and a frist having the same. It relates to a restrained structure.

In general, the anchor device is for fixing the tendon, and is applied for fixing the tension member of the structure for the introduction of the cable (cable) or prestress of the building structure.

More specifically, the anchor device has been used to fix the tension member of the cable or concrete structure applied to the building structure, such as a bridge such as cable-stayed bridge or suspension bridge.

The structure in which the prestress is introduced by the tension material as described above is called a prestress structure, and in particular, the concrete in which the prestress is introduced is called prestressed concrete, which is provided in the concrete structure for the introduction of the prestress. A conventional anchoring device for fixing the same will be described with reference to FIG. 1.

Referring to FIG. 1, a conventional anchor device 10 is press-fitted into a cylindrical cylinder 11 and the cylinder 11 provided at an end portion of the concrete structure 1, and ends an end portion of the tendon 2. It comprises a wedge-shaped fixing unit 12 for fixing to the cylinder (11).

Here, the tendon 2 penetrates the concrete structure 1 in the longitudinal direction.

In addition, a cone-shaped insertion hole 11a into which the wedge-shaped fixing member 12 is inserted is formed in the cylinder 11, and one end of the tendon 2 embedded in the concrete structure is inserted into the cylinder 11. Exposed to the outside of the cylinder 11 through the hole (11a) and the other end is fixed to the other side of the concrete structure by a separate fixing device (not shown).

In more detail, a tensile force is applied to the tendon 2 while one end of the tendon 2 is drawn out to the outside through the insertion hole 11a. Here, the tendon 2 is axially penetrated through the wedge-shaped fixing unit 12 formed by a pair of fixing members 12a and 12b and is tensioned with a predetermined force, and the tendon 2 is tensioned. When the fixing unit 2 is driven into the insertion hole 11a in the pressed state, the fixing unit 12 is fixed to the cylinder 11 by biting the end portion of the tendon 2 in the tensioned state. .

In other words, when the wedge-shaped fixing unit 12 is completely press-fitted in the correct position inside the insertion hole 11a, the peripheral circumference of the inner peripheral surface of the insertion hole 11a and the outer peripheral surface of the wedge-shaped fixing unit 12 are As a result, the gap between the pair of fixing members 12a and 12b is narrowed, whereby the tendon 2 is fixed to the anchor device in a state in which tensile stress is applied.

Therefore, compressive stress is applied to the concrete structure 1 by the tendons 2 and the anchor device, so that the concrete structure 1 becomes a prestressed structure.

However, according to the conventional anchor device having the above-described structure, the fixing unit 12 hits the inner circumferential surface of the insertion hole (11a) and destroyed when the fixing member 12 is driven and pressed into the insertion hole (11a). There was a problem that was made or modified.

More specifically, a problem arises in that the tip 12c of the fixing unit 12 or the inner circumferential surface of the insertion hole 11a is broken or deformed, which takes a long time to fix the tendon and damages the fixing unit. There was a problem that the consumption of work costs and material costs increases.

In addition, the fixing unit 12 and / or the inner circumferential surface of the insertion hole are damaged or deformed (surface bumps or depressions, etc.) during the press-fitting of the fixing unit, so that the fixing unit 12 is inside the insertion hole 11a. Due to the indentation into the correct position of, the force for fixing the tendon 2 is weakened and the tendon is easily relaxed to obtain a desired amount of prestress.

Furthermore, in the process of removing the fixing unit and re-tensioning the tendon again during repair / reinforcement of the prestressed structure, there is a problem in that the economic loss greatly increases.

The present invention has been made to solve the above-mentioned conventional problems, to provide an anchor device and a prestressed structure having a structure that prevents damage, deformation, wear, etc. of the fixing unit press-fitted for fixing the tendon There is this.

In order to achieve the above object, the present invention provides a body unit formed with an insertion hole through which tendons; A fixing unit press-fitted into the insertion hole to fix the tendon to the body unit; And it is inserted into the inside of the insertion hole, the anchoring device comprising a shock absorbing member configured to mitigate the impact acting between the inner peripheral surface of the insertion hole and the fixing unit in the process of the pressing unit is provided with a prestressed structure having the same do.

Here, the buffer member is configured to surround the front end of the fixing unit to protect the front end of the fixing unit, to mitigate the impact between the inner peripheral surface of the insertion hole and the front end of the fixing unit in the process of the pressing unit. desirable.

And the fixing unit is composed of a plurality of pieces may be pressed into the insertion hole in the state bound by the buffer member.

In the anchor device according to the present invention configured as described above, the buffer member is configured to include a rubber material.

In addition, the buffer member; It may be configured to include a frame portion constituting the skeleton of the buffer member, and a buffer material provided in the frame portion.

Here, the frame part may be configured to include any one material of steel and plastic, and the cushioning material may be configured to include any one material of a silicon material and a rubber material.

In general, a prestressed structure (hereinafter abbreviated as PS) is manufactured by using a tension wire made of piano wire, special steel wire, and other materials to pre-stress the structure to offset the external force applied during the use of the structure. Refers to the structure.

A representative example of the PS structure is PS concrete, and in general, concrete is often cracked due to tensile strain, so if a compressive material is used to give a strong compressive stress to the concrete in advance where tensile strain is expected, concrete Since the tensile force generated during the use of the structure is canceled by the compressive force previously applied to the concrete, the member itself is not subjected to substantially large tensile forces.

Pre-stressing is applied to concrete, which is pretensioning method of placing concrete in a state in which tension is applied to the tension material and curing it, then peeling both ends of the steel wire and adding compressive force to the concrete, and concrete that is hardened after the concrete is hardened. There is a posttensioning method of pulling both tension members installed through the holes made in advance in the interior thereof and fixing both ends to the concrete member ends.

In addition, the anchor device is provided to fix a cable or steel wire of the tension member of the PS structure, the cable-stayed bridge / suspension bridge and other building structures in a predetermined position.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention can be specifically realized the object of the present invention. In the description of this embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted.

First, referring to Figures 2 to 4, it will be described a preferred embodiment of the anchor device and the prestressed structure having the same according to the present invention.

2 is an exploded perspective view illustrating a first embodiment of an anchor device according to the present invention, and FIG. 3 is a perspective view showing a first embodiment of a shock absorbing member for the anchor device according to the present invention installed in a fixing unit. 4 is a cross-sectional view showing an embodiment of the prestressed structure in which the anchoring device shown in FIG. 2 is installed.

2 to 4, an embodiment 100 of an anchor device according to the present invention includes a fixing unit 120 and a cushioning member 130 for fixing the body unit 110 and tendon. .

Here, the body unit 110 is provided on one side of the structure 1 for introducing the prestress, the insertion hole 111a through which the tendon 2 is formed.

In detail, the body unit 110 includes a fixing body 111 in which the insertion hole 111a is formed, and the insertion hole 111a extends in the longitudinal direction of the tendon in the fixing body 111. Is formed. In addition, one end of the tendon 2 is exposed to the outside of the body unit 110 through the insertion hole 111a in order to apply prestress to the structure 1.

In addition, in order to fix the tendon 2 to the body unit 110, the fixing unit 120 is forcibly pressed into the insertion hole 111a. In more detail, the fixing unit 120 is press-fitted into the insertion hole 111a to press the tendon 2 so that the tendon 2 is fixed to the body unit 110.

In the present embodiment, the fixing unit 120 has a tapered portion of which a side surface of the longitudinal section is inclined in a straight line or curvature so that the cross-sectional area becomes narrower toward the tip, and performs a role similar to a key, which is a mechanical element. do.

Substantially, such a shape is referred to as a wedge in the present invention, a concept including not only a pointed shape, but also a truncated shape (a shape in which the tip is cut in the transverse direction perpendicular to the axis) such that the cross-sectional area decreases toward the tip. to be.

In addition, the cross-section of the fixing unit may be composed of a polygon such as a circle or a square, it is not limited to the shape.

The fixing body 111 is illustrated as being configured in a cylindrical shape, but the external shape is not limited thereto, and the insertion hole 111a has a wedge-shaped inner space corresponding to the fixing unit 120.

In the present embodiment, the fixing unit 120 is composed of a pair of fixing members 121, 122, the pair of fixing members 121, 122 due to the overlapping the wedge shape described above The through hole 120a penetrated in the axial direction is formed in the fixing unit 120.

The through hole 120a is formed by the pair of fixing members 121 and 122 overlapping each other. The tendon is positioned between the pair of fixing members 121 and 122 such that one end of the tendon exposed to the outside of the body unit 110 through the insertion hole 111a passes through the through hole. .

When the fixing members 121 and 122 are driven in the above state and press-fitted into the insertion hole 111a, the through holes 120a are narrowed while the pair of fixing members 121 and 122 are narrowed. (2) is strongly asked, so that the tendon 2 is fixed to the body unit 110.

Although not shown, the fixing unit 120 may include a plurality of pieces, more specifically, three or more pieces of fixing members.

In addition, the tendon 2 may be made of various materials such as steel wire or fiber tension material, as well as fiber reinforced plastic (FRP), carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GFRP), and AFRP (Aramid fiber). reinforced plastic). Here, the tendon 2 is installed to penetrate the inside of the structure 1 according to the purpose or is installed outside the structure 1.

On the other hand, the buffer member 130 is inserted into the insertion hole (111a), the inner peripheral surface of the insertion hole (111a) and the fixing unit 120 in the process of the fixing unit 120 is pressed into the insertion hole (111a) Mitigate the impact between).

Here, the shock absorbing member 130 may be configured to include rubber, or may be made of other elastic materials or materials capable of cushioning / cushioning.

In order for the fixing unit 120 to be press-fitted into the insertion hole 111a, the fixing unit 120 must be inserted into the insertion hole 111a, and in this process, the fixing unit 120 and / or the body A strong shock is transmitted to the unit 110.

In particular, the fixing unit 120 enters the inside of the insertion hole 111a in a state where the tip thereof is in contact with the inner circumferential surface of the insertion hole 111a, and thus the fixing unit 120 is pressed in the fixing unit 120. Impact is concentrated on the tip of the 120 and the inner circumferential surface of the insertion hole 111a in contact therewith.

In order to prevent the fixing unit 120 from being destroyed or deformed by the impact applied while the fixing unit 120 is press-fitted, the shock absorbing member 130 is disposed inside the insertion hole 111a.

In this case, the fixing unit 120 is preferably in consideration of the tip end is the most impact, the buffer member 130 is preferably configured to surround the protection of the front end of the fixing unit 120.

More specifically, the buffer member 130 is configured to surround the leading edge, in particular the leading edge of the fixing unit 120 in the process of pressing the fixing unit 120, the tip of the fixing unit is the insertion hole It is preferable to prevent as much as possible from directly contacting the inner circumferential surface of the 111a.

To this end, the fixing unit 120 may be press-fitted into the insertion hole 111a with the buffer member 130 coupled to the front end thereof. Referring to FIG. 3, the buffer member 130 is coupled to the front end of the fixing unit 120 before the fixing unit 120 is press-fitted.

When combined with the shock absorbing member 130 at the front end of the fixing unit 120 as described above, the fixing unit 120 composed of a plurality of pieces are press-fitted in an integrally coupled state, so that the fixing unit 120 There is also an effect that the press-in operation becomes convenient.

Of course, in the state where the buffer member 130 is located between the fixing unit 120 and the insertion hole (111a) may drive the fixing unit 120 and press-fit into the insertion hole (111a), the buffer member 130 ) May be press-fitted into the fixing unit 120 in a state of pre-positioning the inside of the insertion hole 111a.

Here, the buffer member 130 is preferably configured to have a shape corresponding to the outer shape of the fixing unit 120, in particular the outer shape of the front end portion. For example, when the cross section of the fixing unit 120 is circular, the buffer member 130 is also configured in a ring (ring) shape.

The process of fixing the tendon 2 by the anchor device according to the present invention configured as described above is as follows.

First, a tensile force is applied to the tendon 2 while one end of the tendon 2 is drawn out of the body unit 110 through the insertion hole 111a. Of course, although not shown, the other end of the tendon 2 is fixed to the other side of the structure into which the prestress is introduced.

Here, the tendon 2 is tensioned by a predetermined force by penetrating the wedge-shaped fixing unit 120 and the buffer member 130 formed by a pair of fixing members 121 and 122 in the axial direction. When the fixing unit 120 is pushed into the insertion hole 111a in the tensioned state of the tendon 2, the tendon 2 is firmly fixed to the body unit 110.

In addition, the buffer member 130 protects the tip of the fixing unit 120 in the process of press-fitting the fixing unit 12 to prevent breakage or deformation. Accordingly, since the fixing unit 120 may be press-fitted to the exact position in the insertion hole 111a without being destroyed, the force for fixing the tendon 2 may be strengthened.

On the other hand, the anchor device 100, it is preferable that the anchor device 100 further comprises a base plate 140 provided between the one end surface of the structure 1 is installed and the fixing body 111. .

The base plate 140 supports the fixing body 111 to prevent the fixing body 111 from penetrating into one end surface of the structure 1 by the tendon 2 to which tensile force is applied. .

In more detail, the base plate 140 is configured to have a wider cross-section than the fixing body 111 (the bottom of the fixing body in FIG. 4) in contact with the base plate 140, thereby providing a contact area between the anchor device and the structure. By widening and preventing stress concentration, the end surface of the structure is prevented from being destroyed during or after prestress introduction.

Figure 4 is an embodiment of the PS structure in which the prestress is introduced by the first embodiment of the anchoring device according to the present invention configured as described above.

According to one embodiment of the PS structure provided in the present embodiment, a structure 1 into which a prestress is introduced, a tendon 2 passing through the structure 1, and one end of the tendon 2 may be formed. It is configured to include an anchor device 100 provided on one end surface of the structure (1) for fixing to the structure (1).

The anchor device 100 is for fixing one end of the tendon (2) to the structure in order to introduce prestress to the structure (1), the anchor device applied to the PS structure according to the present embodiment is described above Since it is the same as the first embodiment of the anchor device according to, repeated description thereof will be omitted.

And the PS structure provided in this embodiment relates to the PS concrete beam, but is not limited thereto.

Here, the method of introducing prestress into the concrete beam includes the above-described pretension method or posttension method, and thus the prestress introduction method is already known, and thus detailed description thereof will be omitted.

Accordingly, when the tendon 2 is anchored by the anchor device 100 in a state in which tensile stress is applied, the concrete structure 1 is subjected to compressive stress by the tendon 2 and the anchor device 100. The concrete structure 1 becomes a PS concrete beam.

Next, with reference to Figures 5a and 5b, another embodiment of the buffer member for the anchor device according to the present invention will be described.

5A and 5B, the shock absorbing member 230 provided in the present embodiment has a bottom portion 232 facing the front end surface of the fixing unit 120 and an edge of the bottom portion 232. It is formed to include a circumference 231 for protecting the periphery of the fixing unit 120, in particular the front circumference of the fixing unit.

Here, a through hole 233 through which the tendon 2 penetrates is formed at the center of the bottom part 232, and an edge at which the bottom part 232 is connected to the circumference part 231 is formed to be curved.

In addition, the circumference 231 serves to protect a circumference of the tip, among the circumferences of the fixing unit 120.

The shock absorbing member 230 according to the present exemplary embodiment configured as described above is inserted into the insertion hole 111a in a state of being coupled to the above-described fixing unit 120 or in a separated state, respectively.

Accordingly, the cushioning member 230 protects the front end surface, the tip circumference, and the tip edge of the fixing unit 120 while the fixing unit 120 is press-fitted to prevent cracking or deformation of the fixing unit 120. You can prevent it.

On the other hand, Figures 6a and 6b is another embodiment of the shock absorbing member for the anchor device according to the present invention.

6A and 6B, the shock absorbing member according to the present embodiment includes a frame 131 and shock absorbers 132a and 132b.

Here, the frame 131 forms a skeleton of the shock absorbing member according to the present invention, and the shock absorbing materials 132a and 132b are integrally provided in the frame 131 to reduce shock.

In more detail, the frame 131 includes, but is not limited to, any one material of steel or plastic so that the buffer member may have a predetermined shape.

The buffer members 132a and 132b may be formed of a material capable of buffering / cushioning such as a silicone material or a rubber material. In the present exemplary embodiment, the shock absorbing member is described as having a ring shape, but the present invention is not limited thereto, and the bump member shown in FIGS. 5A and 5 may be configured to include the above configuration.

Referring to FIG. 6A, the frame 131 is formed in an annular structure such that the fixing unit 120 is fitted before the pressing unit or in the pressing process, and is coupled to the front end of the fixing unit 120. It is configured to surround the outer circumferential surface of the frame 131 to protect the front end of the fixing unit 120 and / or the inner circumferential surface of the insertion hole 111a.

6B, the frame 131 has an annular structure, and the shock absorbing material 132b forms an inner circumferential surface and an outer circumferential surface of the shock absorbing member.

To this end, in the buffer member according to the present embodiment, the buffer member 132b is integrally formed along the inner circumferential surface and the outer circumferential surface of the frame 131 to form a three-layer structure, or the frame is formed along the inside of the annular buffer member 132b. It is also possible to have a structure inherent so that the 131 is not exposed to the outside.

Next, a PS structure having other embodiments of the anchoring device according to the present invention will be described with reference to FIGS. 7A and 7B.

Other embodiments of the anchor device according to the invention is characterized in that it is composed of a plurality of stretchable to enable the tension of the tendon.

FIG. 7A illustrates an anchor device that can be stretched in a two-stage structure, and FIG. 7B illustrates an anchor device that can be stretched in a three-stage structure.

First, referring to FIG. 7A, the anchor device according to the present embodiment includes a body unit 211 and 212 that can be stretched in two stages.

Since the configuration other than the body units 211 and 212 is the same as the first embodiment of the above-described anchor device, the same reference numerals are used for the same configuration, and repeated description thereof will be omitted.

The body unit is configured to include a base end body 211 constituting the base and the withdrawal end body 212 is provided to be able to enter and exit inside the base end body to adjust the tension force of the tendon (2).

Here, a female screw (not shown) is formed in the base body 211. A male screw 121a is formed in the lead end body 212, and is screwed to the female screw of the base end body 211, and a fixing unit for fixing the tendon 2 to the lead end body 212. An insertion hole 212c into which the 120 is press-fitted is formed.

In detail, the base end body 211 is provided with a hollow portion (not shown) in which the female thread is formed, and the male screw 212a is formed on the outer circumferential surface of the lead end body 212, and the lead end is provided. Body 212 is screwed to the hollow portion of the base body 211.

Accordingly, by the relative rotation of the base end body 211 and the withdrawal end body 212 about the axis of the male screw, the withdrawal end body 212 can move in the longitudinal direction of the tendon (2). As a result, the tension force of the tendon 2 fixed to the lead end body 212 may be adjusted.

Meanwhile, the head of the lead end body 212 can be rotated by using a tool such as a spanner (not shown) so that the head unit can be stretched and contracted by rotating the lead end body 212. The operation part 212b is comprised integrally.

Of course, the withdrawal end body 212 may be configured to go in and out by hydraulic pressure, rather than a screw-in method, the configuration for the entry and exit is not limited thereto. However, the hydraulic and the like has the disadvantages of high installation cost and complicated device.

The other configuration and the fixing method of the tendon are the same as in the first embodiment 100 of the above-described anchor device, and the shock absorbing member is applicable to any one of the various embodiments described above, and thus, further description thereof will be omitted. .

However, in order to adjust the tension force of the tendon 2 installed to penetrate the interior of the PS concrete structure, the tendon 2 is penetrated through the inside of the structure such that the tendon 2 is tensionably installed without affecting the concrete structure 1. Through holes (not shown) are formed.

To this end, when the concrete is poured and cured in a state where a long hollow sheath (not shown) is installed in the formwork, a hole, that is, a through hole is formed in the concrete by the sheath, and the inside of the through hole. The tendon 2 is provided. Accordingly, the tendon 2 is prevented from being integrally coupled to the concrete beam structure 1, so that the tendon 2 can be stretched without affecting the concrete structure 1. Forming the through-hole using the sheath as described above is generally known in the post-tension method, so further description thereof will be omitted.

Next, referring to FIG. 7B, the anchor device according to the present embodiment includes a body unit 311, 312, and 313 that can be stretched in three stages.

Configurations other than the body units 311, 312, and 313 are the same as those of the first and second embodiments of the above-described anchor device, so that the same reference numerals are used for the same configuration, and repeated description thereof will be omitted.

The body unit is provided with a base end body 311 constituting the base and the base end body 311 to be able to enter and exit the first drawout body 312 to adjust the tension force of the tendon (2), and It is configured to include a second withdrawal end body 313 configured to enter and exit the first withdrawal end body 312. Of course, the additional drawer body may be further included in the body unit.

Here, the female screw is formed in the hollow portion of the base body 311. In addition, a male screw is formed on an outer circumferential surface of the first lead-out body 312, and screwed to a hollow portion of the base body 311.

In addition, the first outlet end body 312 is also provided with a hollow portion having a female thread, and an external thread is formed on the outer circumferential surface of the second outlet end body 313 to be screwed to the female thread of the first outlet body 312. do. Thus, the second withdrawal end body 313 is mounted inwardly of the first withdrawal end body 312.

Meanwhile, an insertion hole 313b into which the fixing unit 120 is press-fitted for fixing the tendon 2 is formed in the second lead end body 313.

As described above, when the first drawing body 312 and the second drawing body 313 are screwed together, the male screw of the first drawing body 312 and the second drawing body 313 It is preferable that the male screw is a direction opposite to each other in which the screw thread is formed.

In more detail, when the male thread formed on the outer circumferential surface of the first drawing end body 312 is a right screw, the male thread formed on the outer circumferential surface of the second drawing end body 313 is made of a left screw, and the first screw When the male screw formed on the outer circumferential surface of the lead end body 312 is a left screw, the male screw formed on the outer circumferential surface of the second lead end body 313 means a right screw.

The heads (heads) of the first drawer body 312 and the second drawer body 313 are provided with rotation manipulators 312a and 313a each having a polygonal head shape.

When configured as above, in the state in which the second lead-out body 313 is restrained from rotating, the direction in which the first lead-out body 312 extends from the base end body 311, that is, the tendon ( 2) in the direction of tension, the first withdrawal end body 312 advances from the base end body 311 and the second withdrawal end body 313 also the first withdrawal end body 312 Since the advancing from the, the tensile strain value of the tendon 2 per one revolution of the first draw-out body 312 is increased.

In the configuration as described above, even if the tendon 2 is made of a hard material such as steel wire, it is possible to prevent twisting, that is, twisting of the tendon, thereby preventing twisting of the tendon 2 during tensioning of the tendon. At the same time, the load caused by the torsional resistance of the tendon can be reduced.

Of course, in the anchor device configured as shown in Figure 7a when the tendon installed in the PS structure is a rigid material, such as steel wire, the other end of the tendon is fixed to the other end of the PS structure rotating material (so that the tendon can rotate) By installing the bearing) may be to prevent the torsional resistance of the tendon, and may be configured in the fixing unit of the rotating material in the auxiliary body unit applied to the first embodiment of the anchor device.

As described above, the main technical features of the third embodiment of the anchor device according to the present invention shown in Figure 7b relates to an anchor device having a body unit that can be stretched in three or more stages, wherein the fixing on the uppermost body of the body unit An insertion hole is formed to which the unit is coupled. And at least one of the remaining body except the base body of the body unit can be advanced in and out of the screw coupling method, when the body unit comprises two bodies to enter and exit by screwing, of these two bodies It is shown that the screw directions formed on the outer circumferential surface may be configured to be opposite to each other.

As described above, the preferred embodiments of the present invention have been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them.

Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

Referring to the effects of the anchor device and the PS structure having the same according to the present invention configured as described above are as follows.

First, according to the present invention, it is possible to prevent the inner peripheral surfaces of the fixing unit and the insertion hole from being damaged, deformed, or worn in the process of pressing the fixing unit into the insertion hole for fixing the tendon, thereby reducing the work cost and the consumption cost of parts. .

Secondly, according to the present invention, since the fixing unit can enter the insertion hole in a state in which it is not damaged / deformed and reach the home position, the fixing force of the tendon is stably maintained and the loss of the tension force is prevented.

Third, according to the present invention, since the fixing unit can be used again after the fixing unit is separated from the insertion hole for retension of tendon, additional cost is prevented and economical effect is obtained.

Fourth, according to the present invention, the body unit is configured to be stretchable to adjust the tension force of the tendon without removing the fixing unit from the body unit.

Claims (8)

A body unit having an insertion hole through which the tendon penetrates; A fixing unit press-fitted into the insertion hole to fix the tendon to the body unit, the fixing unit comprising a plurality of pieces; And The inner peripheral surface of the insertion port and the fixing unit of the fixing unit are surrounded by the front end of the fixing unit formed of the plurality of pieces so that the fixing unit is pressed into the inside of the insertion hole while the fixing unit is engaged. A shock absorbing member for alleviating impact acting between the tips; The buffer member is; A frame constituting the skeleton of the buffer member, and Anchor device comprising a cushioning material provided in the frame. delete delete delete delete The method of claim 1, The frame anchor device, characterized in that comprising a material of any one of steel and plastic. The method according to claim 1 or 6, The cushioning material is an anchor device, characterized in that comprises a material of any one of a silicon material and a rubber material. A prestressed structure includes a structure into which a prestress is introduced, a tendon penetrating through the structure, and an anchor device provided at one end of the structure to anchor one end of the tendon to the structure for introducing the prestress. In the structure, The anchor device is; Body unit is formed through the insertion hole through the tendon, A fixing unit press-fitted into the insertion hole for fixing the tendon to the body unit, and comprising a plurality of pieces; The inner peripheral surface of the insertion port and the fixing unit of the fixing unit are surrounded by the front end of the fixing unit formed of the plurality of pieces so that the fixing unit is pressed into the inside of the insertion hole while the fixing unit is engaged. A shock absorbing member for alleviating impact acting between the tips; The shock absorbing member is a prestressed structure comprising a frame constituting the skeleton of the shock absorbing member and a shock absorbing material provided in the frame.

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