KR101645667B1 - Building construction method using precast column with a progressive collapse prevention part included in rigidity reinforcement means - Google Patents

Abstract

The present invention relates to a method of constructing a building using a PC column having rigidity reinforcing means in the gravity direction continuous collapse preventing portion.
(A) forming a lower layer PC column at a lower portion with respect to a height of a building, wherein the lower layer PC column is formed at a lower level with respect to a floor; (b) a step of forming an upper layer PC column, which is formed integrally with the lower layer PC column by forming a gravity direction successive collapse preventing portion at a predetermined interval on the upper side of the lower layer PC column; (c) installing an integral lower-layer PC column and upper-layer PC column at both sides of the construction site and installing a slab having a spacer on the side of the gravitational direction collapse preventing unit; (d) installing an end of the stiffening means on the side of the gravitational direction collapse preventing portion in the step (c) so as to be exposed outside the lower layer PC column and the upper layer PC column outer periphery to be located inside the slab; And (e) curing the concrete by pouring the concrete on the slab side and the gravity direction successive collapse preventing portion. It is possible to reinforce the end side rigidity of the slab located in the gravity direction successive collapse preventing portion and to prevent the occurrence of cracks at the joining portion of the PC column and the slab, thereby improving the durability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building construction method using a PC column in which a rigid reinforcing means is provided in a gravity direction successive collapse preventing portion.

The present invention relates to a method of constructing a building using a PC column in which a rigid reinforcing means is provided in the gravity direction successive collapse preventing portion. More particularly, the present invention relates to a gravity direction And reinforcing means for reinforcing the end portion of the slab located in the gravity direction successive collapse preventing portion by being provided on the side of the chain collapse preventing portion so as to be located on the inner side of the slab by being exposed outside the lower layer PC column and the upper layer PC column outer peripheral portion The present invention relates to a method of constructing a building using a PC column having rigid reinforcing means in a gravity direction continuous collapse preventing portion for preventing cracks from occurring at the joint between the PC column and the slab, thereby improving durability.

Generally, a precast concrete method (hereinafter referred to as 'PC method') is a method in which a structural member is manufactured in advance in a corresponding specialized concrete factory, is transported to a construction site, and assembled at a predetermined position It is a public law.

This PC method is used to solve the shortage of labor force at the construction site or reduce the cost by reducing the use of construction materials. For example, in the case of a structure having unit modules such as building structure and distribution center, It is possible to secure economical efficiency and construction workability by the construction, and it is possible to reduce the use of the formwork and the construction material by applying the dry method that installs the PC column manufactured at the factory and installs it in the field. And the method of construction, etc. have been actively carried out.

However, in the conventional PC method, there is a problem that the fixing force of the end portion of the slab located on the PC column side is weak, and cracks may occur in the joining portion of the PC column and the slab with time, there was.

Korean Patent No. 10-1072258 (2011.10.05) Korean Patent No. 10-0937745 (2010.01.12)

An object of the present invention is to provide a method of manufacturing a pillar-type PC pillar which is exposed to the outside of a lower-layer PC column and an upper-layer PC column outer periphery on the side of the gravity direction series collapse preventing portion located between a lower-layer PC column formed by a PC method and an upper- So as to reinforce the end side rigidity of the slab located in the gravity direction successive collapse preventing portion and to prevent cracks from occurring at the joining portion of the PC column and the slab to improve the durability, And to provide a method of constructing a building using a PC column having rigid reinforcing means in the chain collapse preventing portion.

According to another aspect of the present invention, there is provided a method of constructing a building using a PC column having rigid reinforcement means in a gravity direction continuous collapse preventing portion according to the present invention, comprising the steps of: (a) A lower layer PC column forming step located in the lower layer PC; (b) an upper layer PC column forming step of forming a gravity direction successive collapse preventing part at a predetermined interval on the upper side of the lower layer PC column and being formed integrally with the lower layer PC column; (c) installing a lower-layer PC column and an upper-layer PC column integrally with each other in the building site, and installing a slab having a spacer on the side of the gravity-direction successive collapse preventing portion; (d) installing an end of the stiffening means on the side of the gravity direction successive collapse preventing portion in the step (c) so as to be exposed to the outside of the lower layer PC column and the upper layer PC column outer peripheral portion to be located inside the slab; And (e) curing the concrete by placing the concrete on the gravity direction successive collapse preventing portion and the slab side. .

Wherein the lower layer PC column and the upper layer PC column are formed by a centrifugal force in either a hallow-type or a closed type, the lower layer PC column and the upper layer PC column are embedded so as to penetrate the gravity direction series collapse preventing portion in the longitudinal direction, And a cylindrical PC column stiffener for connecting the columns is provided.

The lower layer PC column is installed horizontally at a predetermined depth from the upper end and is provided with a falling prevention member for preventing the concrete from falling when the concrete is poured.

The slab is provided with a reinforcing member at upper and lower portions thereof with reference to the spacer.

Wherein the stiffening means has a structure in which both end portions are exposed to the outside of the outer periphery of the PC column body and is embedded in the slab side and adjacent to the stiffener on the lower side of the slab, A pair of first rigid-body rigid bodies having first protrusions protruded in the longitudinal direction of the PC column body; A pair of second rigid-body rigid bodies provided orthogonally to the first rigid-body rigid body and having second protruding portions at both ends corresponding to the first protruding portions; A pair of third rigid frame rigid bodies provided adjacent to the stiffener on the upper side of the slab and having third projections formed at both ends thereof in the longitudinal direction of the PC column body; And a pair of fourth rigid-body rigid bodies provided orthogonally with the third rigid-rigid body and having fourth protrusions at both ends corresponding to the third protrusions; .

And a third reinforcing steel support body that is embedded in the longitudinal direction of the PC column body and supports the first, second, and third rigid beam rigid bodies at a point where the first and second rigid beam rigid bodies and the third and fourth rigid- Is provided.

Wherein the stiffening means has a structure in which both end portions are exposed to the outside of the outer periphery of the PC column body and is embedded in the slab side and adjacent to the stiffener on the lower side of the slab, A pair of first bending rigid steel rigid bodies having a first bending portion bent upwardly; A pair of second flexural rigidity rigid bodies provided orthogonally to the first flexural rigidity rigid body and having a second bend portion having a shape corresponding to the first bendable portion; A pair of third bent steel rigid bodies provided adjacent to the stiffener on the upper side of the slab and having a third bent portion bent downward at both ends thereof; A pair of fourth bent steel rigid bodies provided orthogonally to the third bent rigidity rigid body and having fourth bent portions at both ends corresponding to the third bent portions; .

The first and second bending rigid stiffening members and the third and fourth bending rigid stiffening members are embedded in the longitudinal direction of the PC column body to support the first, second, And a reinforcing means support base is provided.

As described above, according to the building construction method using the PC column provided with the stiffening means in the gravity direction continuous collapse preventing portion according to the present invention, the gravity of the lower layer PC column formed by the PC method and the gravity And the rigid reinforcing means is provided on the side of the directional chain collapse preventing portion so as to be positioned on the inner side of the slab by being exposed to the outside of the lower layer PC column and the upper layer PC column outer peripheral edge portion so as to reinforce the end side rigidity of the slab located in the gravity direction successive collapse preventing portion It is possible to prevent cracks from occurring at the joint between the PC column and the slab, thereby improving durability.

In addition, according to the method of constructing a building using a PC column in which the rigid reinforcing means is provided in the gravity direction successive collapse preventing portion according to the present invention, it is possible to change the season (in particular, summer) through the air communicating hole of the spacer contained in the slab, The air inside the spacer is discharged to the outside through the air communication hole to prevent explosion or damage, so that the fire resistance can be improved.

In addition, according to the construction method using a PC column in which the rigid reinforcing means is provided in the gravity direction continuous collapse preventing portion according to the present invention, when the spacer is shrunk as the air temperature is lowered, air is introduced into the spacer through the air communication hole So that damage to the spacer body can be prevented.

1 is a flowchart showing a construction procedure for a building construction method using a PC column having rigidity reinforcement means in a gravity direction successive collapse preventing portion according to the present invention.
2 is a block diagram showing a part of a building in which the rigidity reinforcing means according to the first embodiment of the present invention is installed.
3 is a view showing a structure in which the rigidity reinforcing means according to the first embodiment of the present invention is installed in the gravity direction successive collapse preventing portion between the lower layer PC column and the upper layer PC column.
4 is a sectional view taken along the line A-A 'in FIG.
5 is a block diagram showing a part of a building in which the stiffening means according to the second embodiment of the present invention is installed.
6 is a view showing a structure in which the rigidity reinforcing means according to the second embodiment of the present invention is installed in the gravity direction successive collapse preventing portion between the lower layer PC column and the upper layer PC column.
7 is a cross-sectional view taken along the line B-B 'in FIG.
8 is a plan sectional view showing the shapes of the lower layer PC column and the upper layer PC column according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The term is synonymous with the generic meaning of the term as understood by those of ordinary skill in the art to which the present invention pertains and if the term used herein conflicts with the general meaning of the term, And the same reference numerals throughout the specification denote like elements.

It should be noted that the method of constructing a building using a PC column provided with the stiffening means in the gravitational directional collapse preventing portion shown in this specification can be implemented in various embodiments and is not limited to the embodiments described herein, do.

According to a method of constructing a building using a PC column in which a rigid reinforcing means is provided in the gravity direction continuous collapse preventing portion according to the present invention, the method comprises: (a) forming a lower layer PC column (S110); (b) an upper layer PC column forming step (S120) formed integrally with the lower layer PC column; (c) A slab having an integral lower-layer PC column and an upper-layer PC column installed at the construction site and having a spacer at the side of the gravity direction sequential collapse preventing portion between the lower-layer PC column and the upper- (S130); (d) installing (S140) an end portion of the stiffening means on the side of the gravitational collapse prevention unit in the gravitational direction so that the end portion of the stiffening means is exposed outside the outer circumferential edge of the lower PC column and the upper PC column; And (e) curing (S150) casting concrete on the side of the gravity direction successive collapse preventing portion and the slab side. .

(a) In the lower layer PC column forming step (S110), the lower layer PC column 110 in which the building to be installed is located at the lower part based on the height of the building in consideration of the height is manufactured by the PC method.

(b) In the upper layer PC column forming step S120, which is formed integrally with the lower layer PC column, the upper layer PC column 120 located on the upper side of the lower layer PC column 110 is formed. In the upper layer PC column 120, Layer PC column 110 and a gravity direction successive collapse preventing part 130 is formed between the lower layer PC column 110 and the upper layer PC column 120 by a PC method.

The lower layer PC column 110 and the upper layer PC column 120 in the step (a) and the step (b) may be selectively provided in a hallow-type or a closed type, Thereby forming the body 100.

The lower PC layer 110 and the upper layer PC column 120 are filled with a gravitational directional chain collapse preventing part 130 in the longitudinal direction to form a cylindrical PC It is preferable that the column stiffener 140 is installed.

(c) A slab having an integral lower-layer PC column and an upper-layer PC column installed at the construction site and having a spacer at the side of the gravity direction sequential collapse preventing portion between the lower-layer PC column and the upper- The lower layer PC column 110 and the upper layer PC column 120 are installed in the corresponding building site in the step S130 of installing the lower layer PC column 110 and the upper layer PC column 120, The slab 150 having the spacer 160 is installed in the gravity direction successive collapse preventing portion 130 provided between the gravity direction successive collapse preventing portion 130 and the gravity direction successive collapse preventing portion 130. [

The slab 150 installed in the step (c) is provided with a spacer 160 for reducing the amount of concrete used when the concrete is poured, and the reinforcing members 152a and 152b are provided on the upper and lower sides with respect to the spacer 160, .

The spacer 160 (also referred to as a hollow ball) can significantly reduce the amount of concrete used and is disclosed in the registered patent application No. 10-1036580 filed on May 17, 2011 'A spacer having a vibration damping mechanism' published in Registration No. 10-1015830 (Feb. 11, 2011) and a spacer having a vibration damping mechanism disclosed in Korean Patent No. 10-1015829 A spacer having a vibration damping mechanism "published on February 11, 2011, a spacer having a vibration damping mechanism disclosed in a registered patent No. 10-0908228 (2009.07.10) A spacer for reducing the amount of concrete buried in a slab of a building, which is disclosed in Korean Patent Application No. 0753553 (Aug. 23, 2007), and a spacer for reducing the amount of concrete buried in a slab of a building, which is disclosed in Korean Patent No. 10-0778072 To reduce concrete usage Spacer spacer embedded in the slab, and the Patent No. 10-0887706, which is published in the (06/05/2008), and using the same can be provided by various structures, such as slab.

The spacer 160 may also be referred to as a hollow ball, and the slab having the spacer 160 may be referred to as a 'voided concrete slabs'.

The slurry 160 may be formed in various shapes such as a ball type and a square box type, and may be made of various materials such as urethane, PS, PE, and foamed urethane.

In this spacer 160, an air communication hole is formed at a predetermined position as in the case of the registered patent No. 10-0778072. As the air temperature increases due to a change in season (especially summer) or a fire, The air inside the spacer 160 is discharged to the outside through the air communication hole to prevent explosion or damage Therefore, when the spacer 160 is shrunk as the air temperature is lowered, air is introduced into the spacer 160 through the air communication hole, thereby preventing damage to the body of the spacer 160 .

These reinforcing members 150a and 152b are composed of a gravity direction successive collapse preventing portion 130 positioned between the lower layer PC column 110 and the upper layer PC column 120 and a gravity direction successive collapse preventing portion 130 having a predetermined tensile force at the adjacent positions, The hinge can be connected to each other via a plastic hinge and the slab can be suspended from the floor for a predetermined time through the plastic hinge for preventing collapse when the building collapses, .

(d) In the step (S140) in which the ends of the stiffening means are exposed to the outside of the lower layer PC column and the upper layer PC column outer peripheral edge to be located on the inner side of the slab on the side of the gravity direction chain collapse preventing portion, The rigid reinforcing means 170 is provided on the side of the gravity direction successive collapse preventing portion 130 located between the upper layer PC columns 120 and the end portion of the rigidity reinforcing means 170 is disposed between the lower layer PC column 110 and the upper layer PC column The slab 150 is exposed to the outside of the outer periphery of the slab 150 to be installed inside the slab 150.

In this process, the fall prevention piece 180 is installed on the lower layer PC column 110 at a predetermined depth from the upper end.

The fall preventing pieces 180 are horizontally installed to prevent the concrete from falling when the concrete is poured.

The stiffening means 170 in the step (d) may be provided according to the first and second embodiments described below, and may be formed in various structures without being limited to the first and second embodiments.

(Embodiment 1)

The stiffening means 170 according to the first embodiment of the present invention has a structure in which both ends are exposed to the outside of the outer periphery of the PC column body 100 so as to be embedded in the slab 150 side.

The rigidity reinforcing means 170 includes a first rigid frame rigid body 171 provided with a first protruding portion 171a provided adjacent to a stiffener 152a on the lower side of the slab and a first rigid frame rigid body 171 provided orthogonally to the first rigid frame rigid frame 171 A third rigid frame rigid body 173 provided with a second rigid frame rigid body 172 provided with a second projection portion 172a and a third projection portion 173a provided adjacent to the stiffener 152b on the upper side of the slab, And a fourth rigid frame 174 having a fourth projection 174a provided orthogonally to the rigid frame rigid 173. [

The first rigid frame rigid bodies 171 are provided at a position adjacent to the stiffener 152a on the lower side of the slab as a pair.

Both end portions of the first rigid frame rigid body 171 are exposed to the outside of the outer circumferential edge of the PC column body 100 and are embedded in the slab 150 side so that the first protrusions 171 protruding in the longitudinal direction of the PC column body 100 171a are provided to ensure durability after construction.

The second rigid frame rigid bodies 172 are arranged to be orthogonal to the first rigid frame rigid frame 171 as a pair.

Both end portions of the second rigid frame rigid body 172 are exposed to the outside of the outer periphery of the PC column body 100 and are embedded in the slab 150 side so that the second projections 182 protruding in the longitudinal direction of the PC column body 100 172a are provided to ensure durability after construction.

The third rigid frame rigid bodies 173 are formed as a pair and are disposed adjacent to the stiffener 152b on the upper side of the slab.

Both end portions of the third rigid frame rigid body 173 are exposed to the outside of the outer periphery of the PC column body 100 and are buried in the side of the slab 150. The third protrusions 173 protruded in the longitudinal direction of the PC column body 100 173a are provided to improve the durability after the installation.

The fourth rigid frame rigid bodies 174 are arranged so as to be orthogonal to the third rigid frame rigid frame 173 in a pair.

Both ends of the fourth rigid frame rigid body 174 are exposed to the outside of the outer circumferential edge of the PC column body 100 and are embedded in the slab 150 side. The fourth protrusion portions 174 protruded in the longitudinal direction of the PC column body 100 174a are provided to improve the durability after the installation.

Inside the intersection of the first and second rigid frame members 171 and 172 and the third and fourth rigid frame members 173 and 174, , And four reinforcing rigid bodies (171, 172, 173, 174), so that durability can be improved.

(Second Embodiment)

The stiffening means 170 according to the second embodiment of the present invention has a structure in which the both ends are exposed to the outside of the outer periphery of the PC column body 100 so as to be embedded in the slab 150 side.

The rigidity reinforcing means 170 includes a first bent rigidity rigid body 175 having a first bent portion 175a provided adjacent to a stiffener 152a on the lower side of the slab 150, A second bent rigidity rigid body 176 provided with a second bent portion 176a orthogonal to the first bent rigid portion 176a and a third bent portion 177a provided adjacent to the stiffener 152b on the upper side of the slab 150 And a fourth bent rigid frame member 178 provided with a third bent rigidity beam member 177 and a fourth bent member 178a orthogonally disposed with the third rigid rigid frame member 177. [

The first bent rigid frame rigid bodies 175 are installed adjacent to the stiffener 152a located on the lower side of the slab 150 as a pair and are installed such that both ends are exposed to the outside of the outer periphery of the PC column body 100.

A first bent portion 175a is provided at both ends of the first bent rigidity rigid body 175 and is bent upward.

The second bending rigid frame rigid bodies 176 are arranged to be orthogonal to the first bending rigid frame 175 in a pair.

A second bent portion 176a having a shape corresponding to the first bent portion 175a of the first rigid rigid frame member 175 is provided at both ends of the second rigid reinforcing steel member 176. [

The third bent rigid frame rigid bodies 177 form a pair and are structured adjacent to the stiffener 152b on the upper side of the slab 150. [

The third bent rigidity rigid body 177 is provided at its both ends with a third bent portion 177a bent downward.

The fourth bent rigid frame rigid bodies 178 are provided so as to be orthogonal to the third bent rigid frame rigid bodies 177. The fourth bent rigid frame rigid bodies 178 have a shape corresponding to the third bent portion 177a of the third rigid rigid frame member 177 at both ends thereof A fourth bent portion 178a is provided.

Stabilizing means support 190 is provided inside a point where the first and second bending rigid members 175 and 176 and the third and fourth bending rigid members 177 and 178 intersect with each other.

The stabilizer means 190 is embedded in the longitudinal direction of the PC column body 100 to support the first, second, third and fourth bending rigid members 175, 176, 177 and 178.

(e) In the step of curing by placing the concrete in the gravity direction successive collapse preventing portion and the slab side, the gravity direction successive collapse preventing portion 130 and the spacer (not shown) positioned between the lower layer PC column 110 and the upper layer PC column 120 The concrete slab 150 is installed on the side of the slab 150 to cure the concrete.

The lower layer PC column 110 and the upper layer PC column 120 may be manufactured using centrifugal force, or may have a variety of structures such as a Hallow-type or an enclosed type in which the inside is penetrated.

The outer periphery of the lower layer PC column 110 and the upper layer PC column 120 can be formed variously according to the structure of the building such as a circular shape or a polygonal shape.

According to the building construction method using the PC column having the stiffening means in the gravity direction continuous collapse preventing portion according to the first and second embodiments of the present invention, the lower layer PC column 110 formed by the PC method, Layer PC column 110 and the upper PC column 120 on the side of the gravity direction successive collapse preventing portion 130 positioned between the PC columns 120 so as to be positioned inside the slab 150 By providing the rigidity reinforcing means 170, it is possible to reinforce the end side rigidity of the slab 150 located in the gravity direction successive collapse preventing portion 130 and to prevent cracks from occurring at the joining portion between the PC column and the slab, There is an advantage that it can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, As shown in FIG.

S110: lower layer PC column forming step,
S120: an upper layer PC column forming step formed integrally with the lower layer PC column,
S130: installing a lower-layer PC column and an upper-layer PC column integrally with each other in the building site by installing a slab having a spacer on the side of the gravity direction sequential collapse preventing portion between the lower-layer PC column and the upper-
S140: installing the end of the stiffening means on the side of the gravitational direction collapse preventing unit so as to be exposed to the outside of the lower layer PC column and the upper layer PC column outer periphery to be located inside the slab,
S150: curing by pouring the concrete on the side of the successive collapse preventing portion in gravity direction and the slab side,
100: PC column body,
110: lower layer PC column,
120: Upper layer PC column,
130: gravity direction chain collapse preventing portion,
140: PC column stiffener,
150: Slab,
152a: lower stiffener,
152b: upper stiffener,
160: Spacer,
170: rigidity reinforcement means,
171: First rigid body,
171a: first protrusion,
172: second rigid frame rigid body,
172a: a second protrusion,
173: Third rigid body,
173a: third protrusion,
174: Fourth rigid frame rigid body,
174a: fourth protrusion,
175: first bent rigid frame rigid body,
175a: a first bent portion,
176: a second bending rigid body,
176a: a second bent portion,
177: Third bent rigid frame rigid body,
177a: a third bent portion,
178: Fourth bending rigid body,
178a: fourth bend,
180:
190: Stable reinforcement means support,
H: Plastic hinge for preventing collapse.

Claims (9)

(a) a step of forming a lower layer PC column, which is stacked in correspondence with a height of a building, and is located at a lower portion with respect to an interlayer;
(b) an upper layer PC column forming step of forming a gravity direction successive collapse preventing part at a predetermined interval on the upper side of the lower layer PC column and being formed integrally with the lower layer PC column;
(c) installing a lower-layer PC column and an upper-layer PC column integrally with each other in the building site, and installing a slab having a spacer on the side of the gravity-direction successive collapse preventing portion;
(d) installing an end of the stiffening means on the side of the gravity direction successive collapse preventing portion in the step (c) so as to be exposed to the outside of the lower layer PC column and the upper layer PC column outer peripheral portion to be located inside the slab; And
(e) curing the concrete by placing the concrete on the gravity direction successive collapse preventing portion and the slab side;
Lt; / RTI >
Wherein the slab is provided with a reinforcing member at upper and lower portions with respect to the spacer,
Wherein the rigidity reinforcing means comprises:
Wherein the first and second end portions of the PC column are exposed outside the PC column outer peripheral portion,
A pair of first rigid-bearing rigid bodies adjacent to the stiffener on the lower side of the slab;
A pair of second rigid-body rigid bodies disposed orthogonally to the first rigid-body rigid body;
A pair of third rigid frame rigid bodies adjacent to the stiffener on the upper side of the slab; And
A pair of fourth rigid-body rigid bodies that are installed orthogonally to the third rigid-body rigid body;
/ RTI >
The upper side stiffener and the lower side stiffener are connected to each other through a gravity direction successive collapse preventing portion and a plastic collapse preventing plastic hinge (H) having a predetermined tensile force at adjacent positions, Wherein the slab is suspended from the floor for a predetermined period of time without dropping directly on the floor, wherein the reinforcing means is provided in the gravity direction continuous collapse preventing portion.
The method according to claim 1,
Wherein the lower layer PC column and the upper layer PC column are formed of one of a Hallow-type or a closed type by centrifugal force,
And a cylindrical PC column stiffener embedded in the gravity direction successive collapse preventing portion so as to penetrate the gravity direction successive collapse preventing portion in the longitudinal direction and connecting the lower layer PC column to the upper layer PC column. Construction method using PC column.
The method according to claim 1,
Wherein the lower layer PC column is provided horizontally at a predetermined depth from the upper end portion and is provided with a falling prevention member for preventing concrete from dropping when concrete is poured. A method of building construction using.
delete 4. The method according to any one of claims 1 to 3,
The first rigid frame rigid body is provided with first protrusions protruding in the PC column longitudinal direction at both ends exposed to the outside of the PC column outer circumferential edge,
The second rigid frame rigid body is provided with a second projection portion having a shape corresponding to the first projection portion at both ends,
The third rigid frame rigid body is provided at its both ends with a third projection portion protruding in the PC column longitudinal direction,
The fourth rigid-body rigid body is provided with a fourth projection portion having a shape corresponding to the third projection portion at both end portions thereof,
The upper side stiffener and the lower side stiffener are connected to each other through a gravity direction successive collapse preventing portion and a plastic collapse preventing plastic hinge (H) having a predetermined tensile force at adjacent positions, Wherein the slab is suspended from the floor for a predetermined period of time without dropping directly on the floor, wherein the reinforcing means is provided in the gravity direction continuous collapse preventing portion.
delete 4. The method according to any one of claims 1 to 3,
The first rigid frame rigid body is provided with a first bending portion bent upward at both ends exposed to the outside of the PC column outer peripheral edge,
The second rigid frame rigid body is provided with a second bending portion having a shape corresponding to the first bending portion at both ends,
The third rigid frame rigid body is provided with a third bending portion formed at both ends thereof and bent downward at both ends thereof,
The fourth rigid frame rigid body is provided with a fourth bend portion at a shape corresponding to the third bend portion at both ends,
The upper side stiffener and the lower side stiffener are connected to each other through a gravity direction successive collapse preventing portion and a plastic collapse preventing plastic hinge (H) having a predetermined tensile force at adjacent positions, Wherein the slab is suspended from the floor for a predetermined period of time without dropping directly on the floor, wherein the reinforcing means is provided in the gravity direction continuous collapse preventing portion.
6. The method of claim 5,
And a third reinforcing steel support body that is embedded in the longitudinal direction of the PC column body and supports the first, second, and third rigid beam rigid bodies at a point where the first and second rigid beam rigid bodies and the third and fourth rigid- Wherein the gravity direction successive collapse preventing portion is provided with a rigid reinforcing means.
8. The method of claim 7,
And a third reinforcing steel support body that is embedded in the longitudinal direction of the PC column body and supports the first, second, and third rigid beam rigid bodies at a point where the first and second rigid beam rigid bodies and the third and fourth rigid- Wherein the gravity direction successive collapse preventing portion is provided with a rigid reinforcing means.

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