KR20190035285A - Connection unit for modular member and construction method of modular structure - Google Patents

Abstract

According to one embodiment of the present invention, a connecting unit for a modular member includes: a first mounting member; a second mounting member provided to be spaced apart from the first mounting member; and a tension member connected between the first mounting member and the second mounting member, wherein the tension member is contracted in length by applied heat or electricity, and attractive force between the first mounting member and the second mounting member can be applied thereto by length contraction of the tension member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a connection unit for a modular member and a method of constructing the modular structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting unit for a modular member and a method of constructing the modular structure, and more particularly to a connecting unit for a modular member and a modular member for modular members capable of securing structural continuity between a plurality of modular members, And a method of constructing the structure.

Recently, in the field of construction, a prefabricated structure using a modular member has been spotlighted for dramatically shortening the construction period and improving the quality of the structure. The prefabricated structure is a structure type in which a large structure is divided into units and assembled in the field. A unit member, usually called a modular member, is manufactured under environmental conditions to ensure quality and workability. In addition, it is designed to have a certain size and shape considering the manufacturing cost of the modular member, the productivity, the transportation process of the members and the installation process in the field.

The structural system consisting of modular members shall ensure the structural continuity and sufficient connection performance of each member. If the deformation and the relative displacement between the members occur at the connecting portion of the modular member, smooth load transfer can not be achieved in the entire structure. Therefore, not only the form of the modular member but also the connection method is an important requirement for establishing the prefabricated structure. Therefore, various types of modular structures and connection methods have been proposed by many researchers to date.

The method of connecting the modular member is largely classified into a method using a post tension and a mechanical coupling method using a connecting member.

The first method is a method in which members are joined by a compression force by introducing a post tension by using a tensile member penetrating the members.

The second method is to install the exposed reinforcing bars or couplers so that they can function as a connecting part when modular members are manufactured, and then connect them with adjacent modular members in the field. At this time, there is a method of connecting reinforcing bars exposed by the reinforcing bars or connecting reinforcing bars by using a coupler, or by using a separate connecting member made of a steel plate or the like.

However, the existing method has to be improved in terms of workability and maintenance.

In the case of the post-tensioning method, additional equipment for introducing a tension force is required, which may result in deterioration in workability and workability, and the detail of reinforcing bars due to the separate fixture and sheath pipe embedding may become complicated. It is possible to prevent the long-term loss of the tenter after grouting the sheath tube after introducing the tensile force to the tenter, but it is impossible to re-tension the tenter to require the maintenance fixing device separately. In the case of post tension, it may be difficult to apply to a short section as soon as the loss occurs.

Also, in the case of the mechanical joint method, since the construction is very complicated and the compressive force is not introduced to the joint surface, cracks can easily occur as the tensile force is generated at the interface during the load application. Therefore, there is a risk of joint cracks and stepped joints in common, and problems such as leakage and corrosion of steel bars may occur.

Patent Registration No. 10-1704291 (Feb. Patent Registration No. 10-1479613 (December 30, 2014)

An object according to an embodiment is to provide a connecting unit for a modular member and a method of constructing a modular structure that combine advantages of conventional post tension and advantages of mechanical coupling.

One object of the present invention is to provide a shape memory alloy which can improve a bonding force (or a tensile force) between a plurality of modular members by using a shape memory alloy, relaxation of tension members that may occur during common use, (Or torsion force) by restricting the tension member to the temperature at the time of occurrence of the loss of the coupling force due to the loss of the coupling force.

An object of an embodiment is to provide a connecting unit for a modular member and a method of constructing a modular structure that can be utilized for structural repair in the event of occurrence of widening or the like of an interface or an engagement surface of a plurality of modular members.

The object of the embodiment is to provide a connecting unit for a modular member and a modular structure which can prevent long-term loss of a coupling force due to being restrained by a placement material, Method.

Since an additional tension device is not required in the embodiment, it is possible to omit the fixing port and the sheath pipe for fixing the equipment, the arrangement of the position where the plurality of modular members are coupled can be simplified, And to provide a connection unit for a modular member and a method of constructing the modular structure without spatial constraints.

According to an aspect of the present invention, there is provided a connection unit for a modular member, comprising: a first fixing member; A second fixing member spaced apart from the first fixing member; And a tension member connected between the first and second fixing members, wherein the tension member is contracted in length by applied heat or electricity, and the first fixation member A force can be applied between the member and the second fixing member.

According to one aspect, the first fixing member is disposed in a first modular member, the second fixing member is provided in a second modular member, and the first modular member and the second modular member are Can be structurally linked.

According to one aspect, the first modular member and the second modular member are each provided with a spotting area filled with a poured material, the tensioning member extending across the interface between the first modular member and the second modular member, So that the compressive force can be directly introduced into the placement material by the length contraction of the tension member.

According to one aspect, the first fixing member includes: a first plate disposed in the first modular member; And a second plate vertically extending from one surface of the first plate toward one end of the tension member and having a through hole formed so that a lower end thereof is opened, and the second fixing member is disposed in the second modular member A third plate; And a fourth plate vertically extending from one surface of the third plate toward the other end of the tension member and having a through hole formed so that a lower end thereof is opened, wherein the first and second fixing members 1 modular member and the second modular member.

According to one aspect of the present invention, there is further provided a temperature adjusting member connected to the tension member and adjusting the temperature of the tension member, wherein the temperature adjusting member can receive heat or electricity from the outside.

According to an aspect of the present invention, there is provided a method of constructing a modular structure, the method comprising the steps of: installing the first modular member and the second modular member so that a spotted area provided in each of the first modular member and the second modular member is connected; ; Providing a connecting unit including a first fixing member and a second fixing member arranged to face each other in the spotting area and a tension member connected between the first fixing member and the second fixing member to generate a tension force, ; Placing a placement material so that the connection unit is embedded in the on-the-spot placement area; And tensioning the tension member, wherein the tension member is tensioned by applied heat or electricity, and the tension force is applied to the tension member from the tension member via the first fixing member and the second fixing member, The first modular member and the second modular member.

According to one aspect of the present invention, there is provided a method comprising: sensing a loss of tension of the tension member after a curing step of the poured material; And applying heat or electricity to the tension member, wherein a loss of tension of the tension member can be restored by heat or electricity applied to the tension member.

According to one aspect of the present invention, in the step of curing the placement material, the tension member can be contracted in length by the heat of hydration of the placement material.

The joining unit for a modular member and the method of constructing a modular structure according to an embodiment can combine advantages of the conventional post tension and advantages of mechanical coupling.

According to the connecting unit for a modular member and the method of constructing a modular structure according to an embodiment, it is possible to improve a coupling force (or a tensile force) between a plurality of modular members by using a shape memory alloy, When loss of bonding force due to relaxation, drying shrinkage and damage of the poured material occurs, the loss of the binding force (or tensional force) can be restored by reaching the temperature of the stressed material.

According to the connecting unit for a modular member and the method for applying a modular structure according to an embodiment, it can be utilized for structural repair when a joining surface or a boundary surface of a plurality of modular members is widened or the like.

According to the modular member connection unit and the modular structure construction method according to the embodiment, it is possible to prevent a long-term loss of the coupling force by being restrained by the placement material, to reduce the loss due to instantaneous loss, It can be easy.

According to the modular structure connection unit and the modular structure construction method according to the embodiment, since no separate tension equipment is required, a fixing port and a sheath pipe for fixing the equipment can be omitted, and a plurality of modular members are combined The positioning of the position can be simplified, and there may be no space limitation on the construction.

Figure 1 shows a connection unit for a modular member according to one embodiment arranged between a plurality of modular members.
Figure 2 shows a connecting unit for a modular member according to one embodiment.
Fig. 3 shows a shape memory effect.
Figures 4 (a) and (b) illustrate the transmission of a tensional force through a tensional element.
5 is a flow chart illustrating a method of constructing a modular structure in accordance with one embodiment.
6 to 9 illustrate a process in which a modular structure according to an embodiment is installed.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.

In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The components included in any one embodiment and the components including common functions will be described using the same names in other embodiments. Unless otherwise stated, the description of any one embodiment may be applied to other embodiments, and a detailed description thereof will be omitted in the overlapping scope.

Figure 1 shows a connecting unit for a modular member according to one embodiment arranged between a plurality of modular members, Figure 2 shows a connecting unit for a modular member according to one embodiment, Figure 3 shows a connecting unit for a modular member, And Figs. 4 (a) and 4 (b) illustrate the transmission of a tensional force through a tensional element.

Referring to Fig. 1, the connecting unit 10 for a modular member according to an embodiment may be disposed in the first modular member M1 and the second modular member M2.

Specifically, the first modular member M1 may be provided as a precast member, and the first modular member M1 may be provided with a field casting area A1. The second modular member M2 may also be provided as a precast member and the second modular member M2 may be provided with a spotting area A2.

At this time, the connection unit 10 for a modular member according to an embodiment is installed in the on-the-spot placement area A1 provided in the first modular member M1 and the on-the-spot placement area A2 provided in the second modular member M2 .

The first modular member M1 and the second modular member M2 may be provided with a reinforcing bar B and the connecting unit 10 for a modular member may be disposed so as to penetrate the reinforced bar. For example, a plurality of reinforcing bars B may be arranged on the first modular member M1 and the second modular member M2, and a plurality of reinforcing bars B may be arranged on the vertical They can be spaced apart from each other in one direction.

A plurality of modular unit connection units 10 may be disposed in the on-the-spot placement area A1 provided in the first modular member M1 and the on-the-spot placement area A2 provided in the second modular member M2. And a plurality of the connecting units 10 for the modular members may be disposed apart from each other along the direction in which the reinforcing bars B are arranged.

1, three modular member connection units 10 are disposed in a field installation area A1 provided in the first modular member M1 and a field installation area A2 provided in the second modular member M2 However, the total number of the connecting units 10 for the modular members is not limited to this, and the number of connecting units 10 for the on-site casting area A1 and the second module member M2 provided on the first modular member M1, But may be variously provided depending on the size of the putting area A2.

2, the connecting unit 10 for a modular member according to one embodiment includes a first fixing member 100, a second fixing member 200, a tension member 300, and a temperature control member 400 ).

The first fixing member 100 may be made of a general steel material, and may include, for example, a first plate 102 and a second plate 104.

The first plate 102 may be disposed in contact with the inner wall of the spotting area A1 provided in the first modular member M1 and the second plate 104 may be disposed on one surface of the first plate 102 And may extend toward one end of the tension member 300 or toward the second modular member.

At this point the end of the second plate 104 is connected to the first modular member M1 and the second modular member M2 so that the tension member 300 can extend across the interface of the first modular member M1 and the second modular member M2. It may not reach the interface of the second modular member M2.

Also, the second plate 104 may have a through-hole 106 so that the lower end thereof is opened. The reinforcing bars B inserted in the first modular member M1 may be inserted into the through holes 106 and the plurality of through holes may be formed in the second plate 104 so that a plurality of reinforcing bars B may pass therethrough. 106 may be spaced apart from one another.

The second fixing member 200 may also be formed of a general steel material and may include a third plate 202 and a fourth plate 204, for example.

The third plate 202 may be disposed in contact with the inner wall of the spotted area A2 provided in the second modular member M2 and the fourth plate 204 may be disposed on one surface of the third plate 202 And may extend toward the other end of the tension member 300 or toward the first modular member M1.

The end of the fourth plate 204 is then coupled to the first modular member M1 and the second modular member M2 so that the tension member 300 can extend across the interface of the first modular member M1 and the second modular member M2. It may not reach the interface of the second modular member M2.

The through hole 206 may be formed in the fourth plate 204 so that the lower end of the through hole 206 is opened. The reinforcing bars B inserted in the second modular member M2 may be inserted into the through holes 206 and the plurality of through holes 204 may be formed in the fourth plate 204 so that a plurality of reinforcing bars B may pass therethrough. 206 may be spaced apart from each other.

The first fixing member 100 and the second fixing member 200 described above may be provided in the same shape as each other, for example. The first and second fixing members A1 and M2, which are provided in the first modular member M1, May be arranged to be symmetrical with respect to each other within the spotting area A2 provided in the member M2.

The first fixing member 100 and the second fixing member 200 are embedded in the placing material in the joining process between the members after the field installation of the first modular member M1 and the second modular member M2, The first modular member M1 and the second modular member M2 can be completely integrated with the modular member M1 and the second modular member M2 and the load transmitted through the tensional member 300 to the first modular member M1 and the second modular member M2.

Specifically, the load transmitted through the tension member 300 is transmitted to the first modular member M1 through the first mounting member 100 and is transmitted to the second modular member M2 through the second mounting member 200. [ The load transmitted through the tension member 300 can be effectively transmitted to the first modular member M1 and the second modular member M2.

Therefore, the shape or the arrangement of the first and second fixing members 100 and 200 is not limited to this, and the load transmitted through the tension member 300 can be transmitted to the first and second modular members M1, (M2). ≪ / RTI >

In addition, a tension member 300 may be connected between the first fixing member 100 and the second fixing member 200.

One end of the tension member 300 is connected to the end of the first fixing member 100 and in particular the second plate 104 and the other end of the tension member 300 is connected to the second fixing member 200, (Not shown).

The tension member 300 can be arranged to extend in a direction perpendicular to the direction of the joining of the reinforcing bars B across the interface between the first modular member M1 and the second modular member M2, The first modular member M1 and the second modular member M2 may be structurally connected by the first and second module members 300 and 300, respectively.

A plurality of tension members 300 may be provided and a plurality of tension members 300 may be spaced apart and connected to each other in the height direction between the first fixing member 100 and the second fixing member 200.

Although not shown in detail, the tension member 300 may be detachably attached to the first and second fixing members 100 and 200, and may include a first fixing member 100 and a second fixing member 200, The second fixing member 200 and the tension member 300 can be easily replaced.

The tension member 300 may be provided, for example, as a shape memory alloy (SMA).

In particular, referring to Fig. 3, the shape memory effect refers to a phenomenon in which an alloy storing an arbitrary shape is cooled to make martensite, then the shape is changed, and the alloy is restored to its original shape when heated and made into austenite.

In addition, since the tension member 300 undergoes a state change at a specific temperature, the length of the tension member 300 can be reduced by using it.

When heat or electricity is applied to the tension member 300 by the shape memory effect of FIG. 3 and the length of the tension member 300 contracts, a force is applied between the first and second fixing members 100 and 200 Lt; / RTI >

At this time, the attraction force applied between the first fixing member 100 and the second fixing member 200 is a tension force induced in the tension member 300, and the tension force is applied to the first and second modular members M1, M2. ≪ / RTI >

Particularly, since the tension member 300 is embedded by the placement material placed in the field installation area A1 provided in the first modular member M1 and the field installation area A2 provided in the second modular member M2 , A direct compression force can be introduced into the cast material.

The compressive force introduced by the tension member 300 can be determined by the following equation.

Where P is the compressive force introduced by the tension member 300,

l is the initial length of the tension member 300,

[Delta] l is the change in length of the tension member 300,

E is the modulus of elasticity of the tension member 300,

A is the cross-sectional area of the tension member 300.

It can be seen from the above equation that the ratio of the compressive force introduced by the tension member 300 to the length variation with respect to the initial length of the tension member 300 is proportional.

The compressive force introduced by the tension member 300 can be calculated by measuring the amount of change in the length of the tension member 300.

Or from the compressive force to be introduced by the tension member 300 when tension forces are to occur in the tension member 300 or when a compressive force is to be introduced at the interface of the first modular member M1 and the second modular member M2 The amount of change in length of the tension member 300 can be calculated inversely so that the heat or electricity to be applied to the tension member 300 can be adjusted.

At this time, if the data on the length change amount of the tension member 300 due to heat or electricity applied to the tension member 300 and the data on the compressive force according to the length variation amount of the tension member 300 are obtained in advance, 300 can more effectively control the compressive force to be introduced.

4 (a) and 4 (b), when the tension F1 is induced by applying heat to the tension member 300, the first plate 102 of the first fixing member 100 (Not shown) is applied to the reinforcing bars B in the left direction and the third plate 202 of the second fixing member 200 is subjected to the acupressure resistance R1 And a reinforcing bar R2 may be applied to the reinforcing bar B in the right direction. The through hole 106 provided in the second plate 104 and the through hole 206 provided in the fourth plate 204 may have a dowel resistance R3 applied thereto.

The tensional force by the tension member 300 is transmitted to the first and second modular members M1 and M2 through the first fixing member 100 and the second fixing member 200 as well as the reinforcing bar B Can be transmitted in various ways.

On the other hand, the temperature control member 400 may be connected to the tension member 300 to control the heat or electricity applied to the tension member 300.

One of the plurality of temperature control members 400 is connected to one end of the tension member 300 and the other of the plurality of temperature control members 400 is tense May be connected to the other end of the member (300).

When a plurality of the tension members 300 are provided, one of the plurality of temperature control members 400 is connected to one end of the plurality of tension members 300, and the other one of the plurality of temperature control members 400 is connected to one end of the plurality of temperature control members 400 May be connected to the other end of the tension member (300).

For example, the temperature regulating member 400 may be provided as a conductor and may receive heat from an external heat source to transfer heat to the tension member 300.

Alternatively, the temperature regulating member 400 may be provided as a thermoelectric element that directly converts electric energy into thermal energy, and may directly heat the tension member 300 by receiving electricity from an external power source.

Alternatively, the temperature regulating member 400 may be provided as a helical coil, and may receive electricity from an external power source to generate an alternating magnetic field to heat the tension member 300.

However, examples of the temperature regulating member 400 are not limited thereto, and any of them can be used as long as the temperature of the tension member 400 can be adjusted.

Thus, the temperature of the tension member 300 can be adjusted by the temperature adjusting member 400, and the length of the tension member 300 can be reduced by increasing the temperature of the tension member 300 in particular.

In the formula for calculating the compressive force introduced by the tension member 300 as described above the length variation of the tension member 300 is related to the temperature regulating member 400 and is controlled by the temperature regulating member 400 or the temperature regulating member 400, or by control of an external power source.

A connection unit for a modular member according to one embodiment has been described. Hereinafter, a method for installing a modular structure using a connection unit for a modular member according to an embodiment will be described.

FIG. 5 is a flowchart illustrating a method of constructing a modular structure according to an embodiment, and FIGS. 6 to 9 illustrate a process of constructing a modular structure according to an embodiment.

Referring to Figure 5, the modular structure according to one embodiment may be constructed as follows.

First, a first modular member and a second modular member are installed so that the on-the-spot areas provided respectively in the first modular member and the second modular member are connected (S10).

Particularly, referring to Figs. 6 (a) and 6 (b), the on-the-spot placement area A1 provided in the first modular member M1 and the on-the-spot placement area A2 provided in the second modular member M2 The first modular member M1 and the second modular member M2 may be connected to be in contact with each other.

The first modular member M1 and the second modular member M2 are in a state in which a reinforcing bar is laid and the putting area A1 and the second modular member M2 provided in the first modular member M1, The reinforcing bars B may be exposed to the outside through the on-the-spot placement area A2 provided in the reinforcing bars.

Next, there is provided a connection unit including a first fusing member and a second fusing member disposed to face each other in a spotting area, and a tension member connected between the first fusing member and the second fusing member to generate a tension force (S20 ).

7 (a) and 7 (b), the connecting unit 10 may include a first fixing member 100, a second fixing member 200, and a tension member 300, The first fusing member 100 and the second fusing member 200 are disposed in the first and second fusing areas A1 and A2 provided in the modular member M1 and the second putting area A2 provided in the second modular member M2, Is spaced symmetrically with respect to each other with respect to the contact surfaces of the modular member (M1) and the second modular member (M2), and the tensional member (300) is arranged to face the contact surfaces of the first and second modular members It can be prolonged.

The reinforcing bars B may be arranged to pass through the lower ends of the first fixing member 100 and the second fixing member 200.

Then, a pouring material is placed so that the connection unit is embedded in the on-the-spot area (S30).

Particularly, with reference to Figs. 8 (a) and 8 (b), it can be seen that the in-situ casting area A1 provided in the first modular member M1 and the casted area A2 provided in the second modular member M2 (C) is installed. Whereby the connection unit 10 is completely embedded and constrained in the placement material C.

Thereafter, the pouring material is cured (S40).

9 (a) and 9 (b), the tension member 300 is contracted in length by the heat of hydration of the placement material C, whereby tensional or compressive forces F1, F2 can be introduced .

At this time, F1 is generated in a direction from the first modular member M1 toward the second modular member M2, for example, the rightward direction, and F2 is generated from the second modular member M2 to the first modular member M1 For example, in the left direction.

The tensional force or compressive force introduced by the hydration reaction during the curing of the placement material C can be transmitted to the first and second modular members M1 and M2 through the connection unit 10. [

In addition, by sensing the loss of tension of the tension member (S50) and applying heat to the tension member (S60), there occurs a loss of the coupling force due to relaxation of the tension member, drying shrinkage and damage of the poured material It is possible to re-induce the tension or compressive force on the first modular member M1 and the second modular member M2 by contracting the tension member when it occurs.

Since the connecting unit for a modular member and the method for applying a modular structure according to one embodiment of the present invention utilize the tensional force generated when the shape memory alloy shrinks, a separate tension device is not required. Therefore, It is possible to omit the pipe, the reinforcement can be simplified, and there is no space restriction on the construction.

In addition, the method for assembling the modular structure and the connecting unit for a modular member according to an embodiment may include a field casting area A1 provided in the first modular member M1 and a field casting area A1 provided in the second modular member M2 A2 can prevent long-term loss of coupling force between the first modular member M1 and the second modular member M2, and unlike the conventional method of introducing a compressive force using a tent, It is easy to apply and the loss due to loss can be reduced immediately.

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the claims set forth below, fall within the scope of the present invention.

10: Connecting unit for modular member
100: first fixing member
102: first plate
104: second plate
106: Through hole
200: second fixing member
202: first plate
204: second plate
206: Through hole
300: tension member
400:

Claims (8)

A first fixing member;
A second fixing member spaced apart from the first fixing member; And
A tension member connected between the first fixing member and the second fixing member;
Lt; / RTI >
The tension member is contracted in length by applied heat or electricity,
And a force is applied between the first fixing member and the second fixing member by a length contraction of the tension member.
The method according to claim 1,
Wherein the first fixing member is disposed in the first modular member,
The second fixing member is provided in the second modular member,
And the first modular member and the second modular member are structurally connected by the tension member.
3. The method of claim 2,
Wherein the first modular member and the second modular member are each provided with a spotting area filled with a poured material and the tensioning member extends across an interface between the first modular member and the second modular member, Wherein a compressive force is directly applied to the poured material by length contraction of the connecting member.
3. The method of claim 2,
Wherein the first fixing member comprises:
A first plate disposed within the first modular member; And
A second plate vertically extending from one surface of the first plate toward one end of the tension member and having a through hole so that a lower end thereof is opened;
Lt; / RTI >
Wherein the second fixing member comprises:
A third plate disposed within the second modular member; And
A fourth plate vertically extending from one surface of the third plate toward the other end of the tension member and having a through hole so that a lower end thereof is opened;
/ RTI >
Wherein the first fixing member and the second fixing member are disposed to face each other in the first modular member and the second modular member.
The method according to claim 1,
Further comprising a temperature adjusting member connected to the tension member and adjusting the temperature of the tension member, wherein the temperature adjusting member is supplied with heat or electricity from the outside.
Installing the first modular member and the second modular member such that a spotting area provided in each of the first modular member and the second modular member is connected;
Providing a connecting unit including a first fixing member and a second fixing member arranged to face each other in the spotting area and a tension member connected between the first fixing member and the second fixing member to generate a tension force, ;
Placing a placement material so that the connection unit is embedded in the on-the-spot placement area; And
Curing the placement material;
Lt; / RTI >
The tension member is tensioned by the applied heat or electricity,
Wherein the tension force is transmitted from the tension member to the first modular member and the second modular member through the first fixing member and the second fixing member.
The method according to claim 6,
After the step of curing the placement material,
Sensing a tension loss of the tension member; And
Applying heat or electricity to the tension member;
Lt; / RTI >
Wherein the tension member is restored to a tension force loss by heat or electricity applied to the tension member.
The method according to claim 6,
In the step of curing the placement material,
Wherein the tension member is contracted in length by the heat of hydration of the poured material.

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