KR100944004B1 - Structure introducing prestress using prestress and thereof construction method - Google Patents

Abstract

The present invention relates to a prestressed structure using a shape memory alloy, which uses a mold, beam, or girder by using a characteristic of a shape memory alloy which is expanded and then stored at a temperature rise and then, when the temperature falls, the original shape is stored and restored. Characterized in that it is used as a tension member for applying a prestress (structure), such as.

In other words, if the temperature of the shape memory alloy is raised and then installed outside the mold and settled and then placed at room temperature, the temperature of the shape memory alloy, which is a tension member, decreases and the original shape is attempted to be restored to the shape memory alloy. The present invention relates to a structure in which a prestress using a shape memory alloy is introduced, and a construction method thereof, in which a compressive stress is generated in the mold to obtain a prestress effect.

In order to implement this, the present invention provides a mold of a structure; A support bracket having an insertion guide connected to the mold and protruding inwardly; A fixing unit coupled to the support bracket insertion guide; And a tension member inserted into the anchorage, the tension member including a shape memory alloy acting as a compressive stress on the mold by being restored at a constant temperature and storing and restoring the original shape as the temperature decreases. It is done by

Tension member, shape memory alloy, support bracket, anchorage, prestress

Description

Structure using prestress using shape memory alloy and construction method {STRUCTURE INTRODUCING PRESTRESS USING PRESTRESS AND THEREOF CONSTRUCTION METHOD}

The present invention relates to a prestressed structure using a shape memory alloy, which uses a mold, beam, or girder by using a characteristic of a shape memory alloy which is expanded and then stored at a temperature rise and then, when the temperature falls, the original shape is stored and restored. Characterized in that it is used as a tension member for applying a prestress (structure), such as.

In other words, if the temperature of the shape memory alloy is raised and then installed outside the mold and settled and then placed at room temperature, the temperature of the shape memory alloy, which is a tension member, decreases and the original shape is attempted to be restored to the shape memory alloy. The present invention relates to a structure and a construction method using prestress using a shape memory alloy capable of obtaining a prestress effect by generating a compressive stress as the compressive force is generated.

In order to implement this, the present invention provides a mold of a structure; A support bracket having an insertion guide connected to the mold and protruding inwardly; A fixing unit coupled to the support bracket insertion guide; And a tension member inserted into the anchorage, and made of a shape memory alloy which acts as a compressive stress to the mold by being restored at a constant temperature and storing and restoring the original shape as the temperature decreases. It is done by

In general structure, a wire using a steel wire is used as a tension material or a tendon to apply prestress.

In order to apply prestress to the mold by such rigid wire, a separate device is used to apply tensile and compressive stresses.

Such a prior art is disclosed in Korean Patent Laid-Open Publication No. 10-2004-0097857 (published Nov. 18, 2004) by Applicant Lee Yong-hwan.

In the simultaneous multiple tensioning method of simultaneously tensioning a plurality of prestressing tension members to provide a uniform tension simultaneous multiple tensioner 50 designed to automatically equal the tension of all the tension members (12).

That is to say that the patent provides a set of center bore cylinders 51 and 52 and a piston 53 to each of the plurality of tension members 12 and the fluid movement path 54 through which the fluid 44 can move between the cylinders. By providing them, an equal tension simultaneous multiple tensioner is disclosed in which the same pushing pressure is applied to each center hole piston 53 so that the same tension force is applied to all the tension members 12.

However, in the case of the published patent, when the same tension is applied to all the tension members 12 by the same pushing pressure to the center hole piston 53 and then the equal tension tension multiple tensioner is removed by the fixing wedge 23. There is a problem in that a slip phenomenon occurs in the fixing wedge 23 to some extent by the tension force applied to all the fixed tension members 12, and thus the tension force applied by the equal tension tension multiple tensioner is different.

In addition, uniform prestress cannot be applied to the mold due to such a different tension force, and thus there is a problem of causing a defect in the mold to which the prestress is applied.

The present invention has been made to solve the above problems,

The present invention relates to a prestressed structure using a shape memory alloy, which uses a mold, beam, or girder by using a characteristic of a shape memory alloy which is expanded and then stored at a temperature rise and then, when the temperature falls, the original shape is stored and restored. Characterized in that it is used as a tension member for applying a prestress (structure), such as.

In other words, if the temperature of the shape memory alloy is raised and then installed outside the mold and settled and then placed at room temperature, the temperature of the shape memory alloy, which is a tension member, decreases and the original shape is attempted to be restored to the shape memory alloy. It is an object of the present invention to provide a structure and a method of constructing the prestress using a shape memory alloy for introducing the prestress by generating a compressive stress as the compressive force is generated.

The structure introducing the prestress using the shape memory alloy according to the present invention

Mold of the structure; A support bracket connected to both ends of the mold and having an insertion guide protruding inwardly; A fixing unit coupled to the support bracket insertion guide; And a tension member inserted into the anchorage, the tension member made of a shape memory alloy acting as a compressive stress on the mold by being restored by storing the original shape as the temperature decreases and the temperature decreases. It is done by

Preferably, the tension member may be replaced with a known steel wire member after being applied prestress to the mold.

More preferably, the tension member is applied with prestress against stress concentrated in the local part of the mold.

In addition, the support bracket insertion guide and the anchorage is characterized in that formed in a wedge shape corresponding to each other,

Preferably, the fixing unit is provided with a hollow portion for the tension member, and a separation prevention protrusion is formed to prevent the tension member from slipping.

More preferably, the anchorage is characterized in that the incision is formed along the longitudinal direction of the anchorage in order to press the tension member when combined with the support bracket insertion guide.

On the other hand the lower side of the mold is characterized in that the support member for the tension member is further provided.

And the tension member is characterized in that consisting of a plate shape.

On the other hand, the construction method of the pre-stressed structure using the shape memory alloy according to the present invention

A first step of stretching the temperature of the tension member; A second step of fixing the tension member extended in the first step to a support bracket connected to the mold of the structure and having a wedge-shaped insertion guide formed therein, and a fixing unit connected to the support bracket insertion guide; And a third step of contracting the tension member extended in the first step and decreasing the temperature and simultaneously applying the prestress to the mold by being constrained to the anchorage.

The tension member is characterized in that it is a shape memory alloy which acts as a compressive stress on the mold by being restored at a constant temperature and remembering and restoring the original shape as the temperature decreases.

Furthermore, the mold further comprises a fourth step in which the tension member is prestressed and then replaced with a known steel wire member.

By the structure and the construction method of the pre-stress using the shape memory alloy according to the present invention

It is a tension member that applies prestress to structures such as molds, beams, or girders, by using the characteristics of shape memory alloys that are restored by increasing the temperature and then decreasing when the temperature decreases. It is characterized by using.

In other words, if the temperature of the shape memory alloy is raised and then installed outside the mold and settled and then placed at room temperature, the temperature of the shape memory alloy, which is a tension member, decreases and the original shape is attempted to be restored to the shape memory alloy. As the compressive force is generated, the compressive stress is also generated in the mold to obtain a prestress effect.

Hereinafter, with reference to the accompanying drawings, a structure and a method for constructing the structure using the pre-stress using the shape memory alloy according to the present invention,

1 and 2 are a perspective view and a side view showing that the tension member is connected to the mold according to the present invention;

3 and 4 are a perspective view and a side view showing that the support member is connected to the mold according to the present invention;

5 and 6 are a perspective view and a side view showing that the tension member is connected to the lower mold according to the present invention;

7 and 8 are a perspective view and a side view showing that the tension member is connected to the 'I' type mold according to the present invention,

9 and 10 is an exploded view and a coupling diagram showing the support bracket insertion guide and the anchorage according to the invention,

11 is a block diagram showing a method for constructing a structure in which prestress is introduced using a shape memory alloy according to the present invention.

1 to 10 is a structure that introduces a prestress using a shape memory alloy according to the present invention

A mold 10 of the structure; A support bracket 20 connected to both ends of the mold 10 and having an insertion guide 22 protruding inwardly; A fixing unit (30) fitted to the support bracket (20) insertion guide (22); And a tension member made of a shape memory alloy which is inserted into the anchorage 30, is elongated at a constant temperature, and is restored by storing the original shape as the temperature decreases, thereby acting as a compressive stress on the mold. 40; consisting of.

In the structure introducing the prestress using the shape memory alloy according to the present invention, the mold 10 is as shown in Figs.

As a mold (girder) 10 used for the structure, it is applicable to all molds 10 having various shapes such as 'box', 'I' mold 12 and 'H' mold, Not specified by any one of the molds,

In describing the present specification, in describing the mold 10, the box-type mold 10 will be referred to unless otherwise specified.

And the structure in the present invention is meant to mean new buildings or existing old buildings and bridges.

In the structure in which the prestress using the shape memory alloy according to the present invention is introduced, the attached bracket to explain the configuration for coupling the support bracket 20 and the anchorage 30 will be described with reference to FIGS. 9 and 10.

The support bracket 20 is

Insertion guides 22 which are connected to both ends of the mold 10 and protruded inwardly are formed to be connected to the fixing unit 30,

The support bracket 20 insertion guide 22 is formed in a wedge shape,

And the anchorage 30 is

It is coupled to the support bracket 20 insertion guide 22,

The support bracket 20 is formed in a wedge shape corresponding to the insertion guide 22 and is inserted into the support bracket 20 insertion guide 22.

In addition, the fixing unit 30 is formed with a hollow portion 32 for the tension member 40, the separation prevention protrusion 34 for preventing the tension member 40 slip (slip) is formed,

The fixing unit 30 has a cutout 36 formed along the longitudinal direction of the fixing unit 30 to press the tension member 40 when the support bracket 20 is coupled to the insertion guide 22.

In addition, a flange 38 is formed at one end of the anchorage 30 for ease of coupling and detachment with the support bracket 20 and the insertion guide 22.

Therefore, when the tension member 40 is inserted into the fixing unit 30 in a state in which the temperature rises, the fixing unit 30 is connected to the support bracket 20 insertion guide 22,

The anchorage 30 is coupled to slide along the inner circumferential surface of the support bracket 20, the insertion guide 22, at this time by pressing the tension member 40 while the cutout portion 36 of the anchorage 30 is compressed Bites.

Next, when the tension member 40 contracts as the temperature decreases at room temperature, the tension preventing member 40 slips off the fixing member 30 due to the compression force generated. ) Will prevent,

The compressive stress by the tension member 40 is restrained so that it can be transmitted to the mold 10 as it is so that the tension member 40 can apply a prestress to the mold 10.

In addition, both sides of the lower side of the mold 10 is provided with a support member 26 for the tension member 40,

When the mold 10 is manufactured by reinforced concrete, the support bracket 20 and the support member 24 may be integrally cured together during curing of the mold 10 or by stud bolts. Fixedly coupled,

When the mold 10 is made of steel, it is fixed or coupled by welding or stud bolt, or the like,

Alternatively, although not shown in the accompanying drawings, in the case of a bridge or the like, it may be fixedly coupled to a bridge or the like supporting the mold 10.

7 and 8, when the mold is an 'I' mold 12, the flanges 12a and 12b formed on the upper and lower portions of the 'I' mold 12, and the Consisting of a web 12c connecting each flange 12a, 12b,

The support bracket 20 is fixedly coupled to a central portion of the web 12c of the 'I' mold 12 or the upper flange 12a, etc.,

The support member 24 is fixedly coupled to the web 12c or the lower flange 12b, and the support bracket 20 and the support member 26 and the 'I'-type mold 12 are It is fixedly coupled by the coupling method as described above.

In addition, the support bracket 20 is connected to the lower portion of the mold 10, the support member 24 is in the form of a support bar between the support bracket 20 between the lower surface of the mold 10 in the direction of gravity or vertical direction It is preferable to connect so as to be supported by the tension member 40 to reinforce the transmission to the mold 10 the compressive stress.

In the structure introducing the prestress using the shape memory alloy according to the invention, the tension member 40 is

It is inserted into the anchorage 30, it is made of a shape memory alloy which acts as a compressive stress to the mold by elongating at a constant temperature and storing and restoring the original shape as the temperature decreases.

The shape memory alloy forming the tension member 40 has a stretch force of up to 5% of strain due to temperature rise and fall, and by using this property, a mold of a stretched and existing aging structure ( 10) It is applied as a tension material on the back.

The tension is formed in the insertion hole 22 of the support bracket 20 connected to the mold 10 by installing it outside the mold 10 of the structure in the stretched state by increasing the temperature in the forming memory alloy. After connecting the fixing unit 30 into which the shape memory alloy which is the member 40 is inserted,

When the shape memory alloy, which is the tension member 10, is left at room temperature, a displacement, ie, contraction, occurs to be restored to its original shape by the material characteristics of the shape memory alloy while the temperature decreases. Shape memory alloy is constrained to the anchorage 30 to act as a compressive stress on the mold (10).

In addition, the shape memory alloy of the tension member 40 is preferably applied to the mold with a prestress and then replaceable with a known steel wire member (not shown),

This is because the shape memory alloy, which is the tension member 40, is an expensive material, and therefore, the permanent use of the tension member 40 as it is may cause another loss in economic terms.

Therefore, after the shape memory alloy, which is the tension member 40, is prestressed to the mold 10, that is, the shape memory alloy, which is the tension member 40, applies compressive stress to the mold 10. By replacing the shape memory alloy of the tension member 40 with a known steel wire member (not shown),

The compressive stress due to the prestress applied to the mold 10 is maintained as it is, and at the same time, the expensive shape memory alloy can be replaced with the steel wire member (not shown), whereby it can be recycled and economical savings can be expected.

Furthermore, when the stress memory and the shape memory alloy which is the tension member 40 are concentrated and localized on the mold, the tension member 40 is installed to apply prestress.

In this case, the elongation rate of the steel wire member (not shown) is proportional to the length, so that a large stress acts at a narrow place of the structure, for example, a continuous point portion in a continuous beam, but the section is very narrow so that the steel wire member (not shown) Is inevitably a single wire, and therefore, a very large force is required to apply a prestress by tensioning a single wire member (not shown).

Therefore, in order to fix the steel wire member (not shown) to the mold 10, an apparatus and an apparatus for separately tensioning the steel wire member (not shown) are needed. And there are a lot of difficulties in working with the devices there was a limit to the introduction of prestress.

Therefore, when the shape memory alloy of the tension member 40 according to the present invention is applied to a local part where the place of the structure is narrow,

There is no need for a separate equipment and device for tensioning and fixing the steel wire member (not shown), and the shape memory alloy, which is the tension member 40, can be applied prestressed to the local portion of the structure. It is possible to secure coverage.

On the other hand, although not shown in the accompanying drawings, the shape memory alloy, which is the tension member 40, can be used not only when used in the form of a general steel wire, but also transformed into a plate shape, such a plate-shaped tension The member 40 is preferably used when it is difficult to apply uniform prestress due to the shape of the steel wire when the mold of the structure is wide.

On the other hand, the construction method of the pre-stressed structure using the shape memory alloy according to the present invention

First step (S1): increasing the temperature to the tension member 40 (extension step),

Second step (S2): the fixing bracket connected to the mold 10 of the structure, the support bracket 20 is formed with a wedge-shaped insertion guide 22, and the fixing bracket connected to the support bracket 20 insertion guide 22 Fixing the tension member extended in the first step to 30 (fixing step),

Third step (S3): The tension member 40 extended in the first step contracts to a temperature drop, and at the same time, is restrained by the anchorage 30 to apply prestress to the mold 10. A sheetlessing applying step).

And the tension member 40 is as described above

It is preferable to introduce a shape memory alloy which acts as a compressive stress to the mold by elongating at a constant temperature and storing and restoring the original shape as the temperature decreases.

Furthermore, in the method of constructing a structure incorporating prestress using the shape memory alloy according to the present invention, the first, second, and third steps (S1), (S2) and (S3)

The mold 10 further includes a fourth step (replacement step) S4 of applying the pre-stressed tension member 40 to a known steel wire member (not shown).

The fourth step (S4) is the shape memory alloy, which is the tension member 40 after the pre-stress is applied to the mold 10 of the expensive material, that is, after the compressive force is applied by the tension member 40 By replacing and fixing the shape memory alloy of the tension member 40 with the steel wire member (not shown), it is possible to recycle the shape memory alloy of the tension member 40 to expect economic savings.

In the above description with reference to the accompanying drawings, a structure and a method of constructing the prestress using the shape memory alloy of the present invention have been described with reference to a specific shape and direction, the present invention can be variously modified and changed by those skilled in the art However, such modifications and variations should be construed as being included in the scope of the present invention.

1 and 2 are a perspective view and a side view showing that the tension member is connected to the mold according to the present invention;

3 and 4 are a perspective view and a side view showing that the support member is connected to the mold according to the present invention;

5 and 6 are a perspective view and a side view showing that the tension member is connected to the lower mold according to the present invention;

7 and 8 are a perspective view and a side view showing that the tension member is connected to the 'I' type mold according to the present invention,

9 and 10 is an exploded view and a coupling view showing the support bracket insertion guide and the anchorage according to the present invention,

11 is a block diagram showing a method for constructing a structure in which prestress is introduced using a shape memory alloy according to the present invention.

<Explanation of Signs of Major Parts of Drawings>

10: mold

12: mold 'I' 12a: upper flange

12b: lower flange 12c: web

20: support bracket

22: insertion guide 24: support member

30: fixing unit 32: hollow part

34: departure prevention protrusion 36: incision

38: incision

40: tension member (shape suppression alloy) 42: steel wire member

Claims (11)

Mold of the structure; A support bracket connected to both ends of the mold and having an insertion guide protruding inwardly; A fixing unit coupled to the support bracket insertion guide; And And a tension member inserted into the anchorage, and made of a shape memory alloy which acts as a compressive stress to the mold by being restored by storing the original shape as the temperature decreases and the temperature decreases. Prestressed structure using shape memory alloy. The method of claim 1, wherein the tension member After the prestress is applied to the mold (prestress) structure that introduces a prestress using a shape memory alloy, characterized in that replaceable with a known steel wire member. The method of claim 1, wherein the tension member A prestress using a shape memory alloy, wherein the prestress is applied to the stress concentrated in the local part of the mold. The method according to any one of claims 1 to 3, The support bracket insertion guide and the anchorage is a structure that introduces a prestress using a shape memory alloy, characterized in that formed in a wedge shape corresponding to each other. The method of claim 4, wherein The fixing unit is provided with a hollow portion for the tension member, A structure incorporating prestress using a shape memory alloy, characterized in that a separation preventing protrusion is formed to prevent the tension member from slipping. The method of claim 5, The anchorage is a structure incorporating prestress using a shape memory alloy, characterized in that the incision is formed along the longitudinal direction of the anchorage in order to press the tension member when combined with the support bracket insertion guide. The method according to any one of claims 1 to 3, Both sides of the lower side of the mold, the structure for introducing the prestress using the shape memory alloy, characterized in that the support member for the tension member is further provided. The method according to any one of claims 1 to 3, The tension member is a structure that introduces a prestress using a shape memory alloy, characterized in that consisting of a plate shape. A first step of stretching the temperature of the tension member; A second step of fixing the tension member extended in the first step to a support bracket connected to the mold of the structure and having a wedge-shaped insertion guide formed therein, and a fixing unit connected to the support bracket insertion guide; And The tension member, which is expanded in the first step, contracts to a temperature drop and at the same time is restrained by the anchorage to apply prestress to the mold. Construction method. The method of claim 9, The tension member is a shape memory alloy which is elongated at a constant temperature and is a shape memory alloy which acts as a compressive stress on the mold by restoring the original shape as the temperature decreases. Method of constructing a structure using prestress. The method of claim 10, And a fourth step of replacing the mold with a known steel wire member after the tension member is applied with the prestress to the mold.

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