KR20220089102A - Precast hollow column structure and the construction method thereof - Google Patents

Abstract

For the production of the precast hollow column structure, it is installed using a bent plate as an inner formwork, and a number of intermediate support points for the concrete pouring pressure acting on the bent plate are formed. A cast hollow column structure and a construction method thereof are disclosed.

Description

Precast hollow column structure and its construction method

The present invention relates to a precast hollow column structure and a construction method thereof. More specifically, to manufacture the precast hollow column structure, it is installed using a bent plate as an inner formwork, and a number of intermediate support points for the concrete pouring pressure acting on the bent plate are formed so that the precast hollow column structure can be manufactured more effectively and It is about a precast hollow column structure that can be constructed and its construction method.

Figure 1a is an exemplary view of the conventional synthetic PHC pile.

According to FIG. 1A, the synthetic PHC pile sets the reinforcing bar networks 82 and 83 inside the pile formwork 81, and after pouring the concrete 84 inside the pile formwork, the concrete poured by centrifugal force has a constant thickness. It is formed with a hollow pile with a hollow part (S) to be formed.

At this time, the reinforcing bar network 83 is exposed to the hollow portion S to serve as a shear connecting reinforcing bar.

Accordingly, in the hollow part (S), the burnt concrete is additionally poured so that the reinforcing bar network 83, which is the shear connecting reinforcing bar, is buried. It can be seen that synthetic PHC piles are being manufactured by pouring concrete.

Accordingly, there is an advantage that the composite performance with the concrete inside the pile can be improved by using the reinforcing bar network 83 including the internal reinforcing bars of the hollow pile as the shear connecting reinforcing bar, but it is said that a rotatable PHC pile formwork facility is required. There were limits.

Figure 1b is an exemplary view of the production of a half precast column using a conventional embedded internal formwork.

According to Figure 1b, the half-precast column is also formed with a hollow portion (S), the shear connection reinforcing bar 40 exposed to the hollow portion (S) is also reinforced as an internal reinforcing bar of the half precast column. Able to know.

A method of manufacturing such a half-precast column is as follows.

That is, as shown in Figure 1b, a first step of installing a plurality of main reinforcing bars 12 and a plurality of shear connecting reinforcing bars 40 in which both ends are bound to the main bars;

A second step of installing a plurality of lightweight section steel (50) equipped with a plurality of stud bolts (60) in a portion where the plurality of shear connecting reinforcing bars (40) cross each other except for the central portion;

a third step of installing the embedded inner formwork 20 so as to be in contact with the outside of the cross-section of the lattice composed of the plurality of shear connecting reinforcing bars 40 and the plurality of lightweight steel sections 50;

A fourth step of installing a plurality of main roots (12) and large roots (14) to be added;

a fifth step of installing external formwork (OF) to the outside of the large root (14) at a predetermined interval, and pouring PC concrete (16) between the outer formwork (OF) and the embedded inner formwork (20); and

A sixth step of pouring the filling concrete 70 into the hollow part (S);

The embedded inner formwork 20 is a rib-rath in the form of an iron plate with a through hole formed therein, and is installed embedded in the filled concrete 70 without being demolded, and is used as an inner formwork when the PC concrete 16 is poured. know, but

Although the rib-rath embedded inner formwork 20 is installed to be supported by the main bar 12 and the main bar 14, in this case, deformation may occur due to the pouring pressure of the PC concrete 16 and the deep concrete 70. It can be seen that there is a limitation that quality control is not easy due to production.

Republic of Korea Patent No. 10-0999020 (Title of the invention: Synthetic PH piles and Synthetic PH piles construction method, Publication date: December 09, 2010) Republic of Korea Patent No. 10-1570484 (Title of the invention: HPC column using lightweight embedded inner formwork and manufacturing method thereof, and construction method using the same, publication date: November 20, 2015)

Accordingly, the present invention provides a bending moment support point member for effectively supporting the PC concrete pouring pressure acting on the bending plate used as an inner formwork in a factory using the shear connecting reinforcing bar of the reinforcing bar network, and using the shear connecting reinforcing bar to form a column structure. After reinforcing bars and using PC concrete to fabricate a precast hollow column structure with a hollow part (S), it is brought to the site and constructed in a precast method as a column structure by pouring filled concrete to ensure quick and quality control. It is a technical task to solve the provision of an effective precast hollow column structure and its construction method.

The precast hollow column structure for achieving the above task is

An embedded inner formwork including a cut-out slit formed from the inside to the outside of the hollow part (S) while forming a through-hole to pass through the bending board is formed on the back surface of the bending board; a reinforcing bar network including a shear connecting reinforcing bar reinforced so as to cross the hollow portion (S) and extend through the through hole so that the end thereof extends to the outside of the bending plate; and a fixed end forming part formed by pressing and fixing the cutting slit to the shear connecting reinforcing bar, wherein the shear connecting reinforcing bar by the fixed end forming part fixed by compression acts as a bending moment supporting point member generated by PC concrete pouring pressure will do

In the method for constructing a precast hollow column structure for achieving the above object, (a) in a factory, a cut-out slit formed from the inside to the outside of the hollow part (S) is formed on the back surface of the bent plate while forming a through hole to penetrate the bent plate. manufacturing an embedded internal formwork comprising the being; (b) forming a fixed end forming part by pressing and fixing the cut slit formed on the back surface of the bending plate to the shear connecting reinforcing bar penetrating the through hole in the factory; (c) In the factory, the shear connecting reinforcing bar reinforced so that the end is extended to the outside of the bent board through the through hole of the bent board across the hollow part (S) is used as a column structure reinforcing bar in the embedded inner formwork. Placing the reinforcement; (d) in the factory, installing the external formwork so that the embedded inner formwork and the reinforcing bar mesh are located inside, and pouring and curing the PC concrete between the outer formwork and the embedded inner formwork; And (e) when the PC concrete is cured, demolding the outer formwork and transporting the precast hollow column structure to the site for construction;

The precast hollow column structure according to the present invention enables the reinforcement of the column structure reinforcing bars and the shear connecting reinforcing bars together on the bent plate material, but enables the production of precast hollow column structures using PC concrete and filled concrete without complicated internal formwork facilities. do.

The precast hollow column structure according to the present invention can be formed into an effective structure against PC concrete pouring pressure resistance by forming a fixed end forming part using the shear connection reinforcing bar of the rebar network on the back side of the bent plate material, so the reinforcing bar network for the column structure is optimized Because it can be done, the weight can be reduced, making economical construction possible.

Since the precast hollow column structure according to the present invention can be manufactured in advance and transported to the site to minimize the weight in assembly and construction, it is possible to secure the workability and workability according to the weight reduction of the member.

1a is an exemplary view of a conventional synthetic PHC pile;
Figure 1b is a manufacturing example of a half precast column using a conventional embedded internal formwork,
2a and 2b is a configuration example of a precast hollow column structure of the present invention,
3a, 3b, 3c and 3d are exemplary views of the precast hollow column structure construction method of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

[Precast hollow column structure 100 of the present invention]

Figures 2a and 2b is an exemplary configuration of the precast hollow column structure 100 of the present invention.

The precast hollow column structure 100 is, as shown in FIG. 2a, a column structure reinforcing bar 122 and a shear connecting reinforcing bar 121 in an embedded inner formwork 110 manufactured by bending a bending plate material 111, a reinforcing bar network ( 120) are spaced apart and manufactured using the

The embedded inner formwork 110 is used as an inner formwork for forming the hollow part (S), but a separate durable formwork facility is not required by using the bending plate material 111 .

At this time, the shear connecting reinforcing bar 121 crosses the hollow portion (S) of the precast hollow column structure 100, and both ends pass through the embedded inner formwork 110, and the ends extend outward from the hollow portion (S) It will be dispatched to be drawn out.

In addition, the shear connecting reinforcing bar 121 is generated by the PC concrete 150 pouring pressure by the fixed end forming part 130 capable of pressing and fixing the shear connecting reinforcing bar 121 to the rear surface of the embedded inner formwork 110. By acting as a bending moment fulcrum member, it is possible to safely pour the PC concrete 150 even using the embedded inner formwork 110 formed by bending the hollow plate 11, which is a thin plate.

In addition, the precast hollow column structure 100, as shown in Figure 2b, after installing the embedded inner formwork 110 in which the hollow part (S) is formed inside the outer formwork 140, the outer formwork 140 and The factory is manufactured by pouring PC concrete 150 between the embedded inner formwork 110 .

Accordingly, the reinforcing bar network 120 is exposed to the hollow part (S) and also serves as a shear connecting reinforcing bar, and while the filled concrete 160 is poured into the hollow part (S) in the field, the reinforcing bars exposed to the hollow part (S) The mesh 120 serves to allow the filled concrete 160 and the precast hollow column structure 100 to be integrally synthesized with each other.

Accordingly, the precast hollow column structure 100 is, as shown in FIGS. 2A and 2B , an embedded inner formwork 110 , a reinforcing bar network 120 , a fixed end forming part 130 , an outer formwork 140 , PC concrete 150 . ), will include the filling concrete (160).

The embedded inner formwork 110 functions as an inner formwork of the precast hollow column structure 100, as shown in FIGS. 2a and 2b, and a plurality of bending plates 111 having a hollow portion S formed therein. As a through-hole 112 of the formed, it is formed to extend to correspond to the extended length of the precast hollow column structure (100).

A fixed end forming part 130 is formed on the rear surface of the through hole 112 formed on the rear surface of the bent plate material 111 .

At this time, the bent plate material 111 having the hollow part S formed therein has the advantage that it can be manufactured in a desired shape because it is freely bent using a thin steel plate, and the through hole 112 in which the fixed end forming part 130 is formed. It is also easy to form.

The fixed end forming part 130 formed on the rear surface of the through hole 112 is formed naturally while forming the through hole 112, and the PC concrete 150 poured as the cut slit 131 itself is embedded in the inner formwork 110. It serves as a closing means to prevent passage of the embedded inner formwork 110 to function as the inner formwork.

That is, the PC concrete 150 passes through the embedded inner formwork 110 from the poured side and serves to prevent leakage to the opposite side.

In addition, the shear connection reinforcing bar 121 of the reinforcing bar network 120 is fixedly installed on the back side of the bending plate 111 of the embedded inner formwork 110 by the fixed end forming part 130, so that by pouring the PC concrete 150 It serves as an intermediate support point for the occurring bending moment,

In the case of the present invention, this is referred to as the role of the bending moment support point member generated by the PC concrete 150 pouring pressure.

Accordingly, as the shear connecting reinforcing bar 121 serves as an intermediate support point for the bending moment as above, it is safe to use the embedded internal formwork 110 formed by bending the thin bending plate material 111, which is a safe PC concrete 150 pouring operation. This is made possible, and it is possible to reduce the amount of reinforcing bars for manufacturing the reinforcing bar network 120 that is the column structure reinforcing bar 122 and the shear connecting reinforcing bar 121 .

Next, the reinforcing bar network 120 is assembled and installed in the embedded inner formwork 110 as internal reinforcing bars of the precast hollow column structure 100, as shown in FIGS. 2a and 2b,

Part of it is reinforced to be embedded in the PC concrete 150, and the shear connecting reinforcing bar 121 exposed to the hollow part S is buried by the filled concrete 160, so that the shear connection of the precast hollow column structure 100 It serves as a reinforcing bar and serves as an internal reinforcing bar of the precast hollow column structure 100 .

Accordingly, it can be seen that, as shown in FIGS. 2A and 2B , the reinforcing bar network 120 includes the shear connecting reinforcing bars 121 and the column structure reinforcing bars 122 .

First, the shear connecting reinforcing bar 121 is a reinforcing bar installed to penetrate the plurality of through-holes 112 formed in the bending plate 111 and to be disposed across the hollow portion S, as shown in FIGS. 2A and 2B . Accordingly, it is embedded in the filled concrete 160 filled in the hollow part S and serves as a shear reinforcement of the precast hollow column structure 100 .

In addition, the through hole 112 is formed by punching with a punching means so that a plurality of incision slits 131 are formed to extend from the inside of the bending plate 111 to the outside. ) is fixed to the back surface of the bending plate material 111 by a method such as compression to serve as an intermediate support member for the bending moment.

Next, the column structure reinforcing bar 122 extends along a plurality of spaced apart stirrup reinforcing bars and the bending plate member 111 to surround the ends of the shear connecting reinforcing bars 121, as shown in FIGS. 2A and 2B, and the stirrup reinforcing bars It is formed of longitudinal reinforcing bars that are connected to each other, and is reinforced to be embedded in the PC concrete 150 .

By reinforcing the column structure reinforcing bar 122 at the end of the shear connecting reinforcing bar 121, it is possible to quickly and simply reinforcing the reinforcing bar network 120 to the embedded inner formwork 110, and the shear connecting reinforcing bar 121 is a column structure It can be seen that the reinforcing bar 122 also serves as a connecting reinforcing bar.

Next, as shown in FIGS. 2A and 2B , the fixed end forming part 130 is formed with the cutting slit 131 formed from the inside to the outside of the bending plate 111 while forming the through hole 112, and is bent. A plurality of reinforcing bars 121 are formed to correspond to the through-holes 112 of the plate 111, and the shear connecting reinforcing bars 121 of the reinforcing bar network 120 are pressed and fixed on the back side of the bent plate 111 by the PC concrete 150 pouring pressure. It serves as a supporting point for the bending moment that occurs.

That is, the bending plate 111 is punched using a punching means so that the cutting slit 131 is formed from the inside of the bending plate 111 to the outside on the back surface of the through hole 112 formed so as to penetrate the bending plate 111. It is formed so that the cut slit 131 is formed together while the hole 112 is formed.

Accordingly, the cutting slit 131 of the fixed end forming part 130 is a shear connecting reinforcing bar 121 in such a way that the shear connecting reinforcing bar 121 reinforced to pass through the through hole 112 is pressed and fixed to the back surface of the bending plate 111. The fact that it is fixedly installed on the back surface of the bent plate member 111 of the embedded inner formwork 110 to serve as an intermediate support member for the bending moment generated by the PC concrete 150 pouring is as described above.

The cutting slit 131 can be simply formed by the same method as punching using a thin bending plate material 111, and is very effective because it is also easy to compress.

Next, the outer formwork 140, as shown in FIGS. 2a and 2b, the reinforcing bar network 120 and the embedded inner formwork 110 integrally reinforced with the embedded inner formwork 110 are located inside the PC concrete As a form for casting 150, the column structure reinforcement 122 and shear connecting reinforcement 121 of the reinforcing bar network 120 located between the embedded inner formwork 110 and the outer formwork 140 are placed so as to be embedded in the northern part. , it is demolded after curing, so that the precast hollow column structure 100 can be manufactured in a factory.

Next, PC concrete 150, as shown in FIGS. 2A and 2B, is concrete poured in a factory in the space between the outer formwork 140 and the embedded inner formwork 110, and the column structure reinforcement 122 of the reinforcing bar network 120. ) and the shear connecting reinforcing bar 121 are integrated with the end.

Next, the filled concrete 160 is filled into the hollow portion (S) of the precast hollow column structure 100 in which the hollow portion (S) is formed, as shown in FIGS. As the concrete poured so that the shear connecting reinforcing bar 121 is buried, the precast hollow column structure 100 manufactured at the factory is brought into the site and set, and then poured.

[ Method of constructing a precast hollow column structure of the present invention ]

3a, 3b, 3c and 3d show an exemplary view of the precast hollow column structure 100 construction method of the present invention.

The precast hollow column structure 100 is after reinforcing the reinforcing bar network 120 in the embedded inner formwork 110 at the factory, and then the reinforcing bar network 120 is inserted into the embedded inner formwork 110 with the fixed end forming part 130 . After being integrated, the PC concrete 150 is poured and cured using the outer form 140 to expose the shear connecting reinforcing bar 121 of the reinforcing bar network 120 in the hollow part (S) of the precast hollow column structure ( 100) after making

After bringing in the precast hollow column structure 100 to the site and constructing it on the base plate,

It can be said that it is a construction method in which the filled concrete 160 is poured into the hollow part S so that the shear connecting reinforcing bar 121 is buried.

Accordingly, the precast hollow column structure 100 can not use a separate inner formwork system to form the hollow part S, and even if the embedded inner formwork 110 is manufactured as the thin plate gulgok plate 111 By using the fixed end forming part 130 formed on the rear surface of the embedded inner formwork 110 to effectively resist the PC concrete 150 pouring pressure, the amount of rebar network 120 installed can be optimized, and economical and rapid construction is possible. it becomes possible

Accordingly, as shown in FIG. 3A , the above-described embedded inner formwork 110 is manufactured in advance at the factory, and is manufactured by forming a through hole 112 in the bending plate material 111 .

Referring to FIG. 3A , since the bending plate 111 is free to bend, it is formed by, for example, a closed rectangular box of a rectangular cross-section, extending to a certain length, and using a roll of the bending plate 111 having a through hole 112 formed therein. It can be seen that the fixed end forming part 130 is naturally formed as a cutting slit 131 on the back surface of the bending plate 111 .

Accordingly, the shear connecting reinforcing bars 121 constituting the reinforcing bar network 120 are reinforced across the hollow portion S in such a way that they are inserted into the two through-holes 112 .

In the case of FIG. 3A , the two shear connecting reinforcing bars 121 are horizontally arranged crosswise with each other, but the arrangement form is not otherwise limited.

Accordingly, it can be seen that the shear connecting reinforcing bar 121 has an end formed in a hook shape so that the longitudinal reinforcing reinforcement of the column structure reinforcing bar 122 is easily connected.

Next, as shown in FIG. 3b , the shear connection reinforcing bar 121 in the reinforcing bar network 120 in advance is reinforced in the embedded internal formwork 110 using the column structure reinforcing bar 122 .

The column structure reinforcing bar 122 extends along a plurality of spaced stirrup reinforcing bars and the bending plate 111 to surround the ends of the shear connecting reinforcing bars 121, and shear connecting reinforcing bars to longitudinal reinforcing bars connecting the stirrup reinforcing bars to each other It can be seen that the hook end of (121) is formed so as to be wrapped, and it is possible to quickly reinforce it as a reinforcement sum by using the shear connecting reinforcing bar (121).

Next, as shown in Fig. 3c, the factory installs the outer formwork 140 so that the embedded inner formwork 110 and the reinforcing bar network 120 are located inside in advance, and the PC concrete 150 is embedded with the outer formwork 140. It is poured and cured between the mold inner formwork (110).

The outer formwork 140 has the embedded inner formwork 110 located on the inside, but one manufactured according to the cross-sectional shape of the precast hollow column structure 100 may be used. In general, a steel formwork may be used.

Accordingly, the embedded inner formwork 110 has a through hole 112 formed therein, but the fixed end forming part 130 also serves to block the through hole 112 with the incision slit 131, so the PC concrete poured differently ( 150) does not leak into the hollow part (S), and even if it leaks, there is no other problem because it flows in a small amount.

The PC concrete 150 may be poured with unrooted concrete.

Next, as shown in Fig. 3d, when the PC concrete 150 is cured, the outer formwork 140 is demolded to produce the precast hollow column structure 100, and transported to the site for construction.

Since the precast hollow column structure 100 is formed so that the shear connection reinforcing bar 121 is exposed in the hollow part (S),

After erecting and setting the precast hollow column structure 100 in which the shear connecting reinforcing bar 121 is exposed to the hollow part S perpendicular to the upper surface of the base plate at the site, the shear connecting reinforcing bar 121 is embedded in concrete ( 160) is poured into the hollow part (S),

The reinforcing bar network 120 exposed to the hollow part S allows the filling concrete 160 and the precast hollow column structure 100 to be integrated with each other, so that the construction of the column structure is possible.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: precast hollow column structure
110: Recessed inner formwork
111: bent plate 112: through hole
120: rebar mesh
121: shear connection reinforcement 122: column structure reinforcement
130: fixed end forming part 131: incision slit
140: outer formwork 150: PC concrete
160: filled concrete

Claims (10)

Recessed inner formwork 110 including a cutting slit 131 formed from the inside of the hollow part S to the outside while forming the through hole 112 to penetrate the bending board 111 is formed on the back surface of the bending board 111 );
A reinforcing bar network 120 including a shear connecting reinforcing bar 121 reinforced so as to cross the hollow portion (S) and extend through the through hole 112 so that the end thereof extends to the outside of the bending plate member 111; and
A fixed end forming part 130 formed by pressing and fixing the incision slit 131 to the shear connecting reinforcing bar 121; includes;
A precast hollow column structure in which the shear connecting reinforcing bar 121 acts as a bending moment support point member generated by the PC concrete 150 pouring pressure by the fixed end forming part 130 that is pressed and fixed. According to claim 1,
The embedded inner formwork 110,
A PC concrete 150 that is poured as a cut-out slit 131 itself formed together while forming a through hole 112 on the rear surface of the bending plate 111 as a hollow part S by bending the bending plate 111 ) is a precast hollow column structure that prevents it from passing through the embedded inner formwork (110). According to claim 1,
The reinforcing bar network 120 is
As internal reinforcing bars including the shear connecting reinforcing bars 121 and the column structure reinforcing bars 122 of the precast hollow column structure 100, they are assembled and installed in the embedded inner formwork 110, and the shear exposed to the hollow part (S) The connecting reinforcing bar 121 is a precast hollow column structure that is embedded by the filled concrete 160 . 4. The method of claim 3,
The shear connecting reinforcing bar 121 is a reinforcing bar installed to pass through a plurality of through-holes 112 formed in the bending plate 111 to be disposed across the hollow portion S, and is filled in the hollow portion S. A precast hollow column structure that is embedded in 160 and serves as a shear reinforcement of the precast hollow column structure 100 . 4. The method of claim 3,
The column structure reinforcing bar 122 extends along a plurality of spaced stirrup reinforcing bars and the bending plate member 111 to surround the ends of the shear connecting reinforcing bars 121 and includes longitudinal reinforcing bars connecting the stirrup reinforcing bars to each other, A precast hollow column structure that is arranged to be embedded in PC concrete (150). According to claim 1,
The fixed end forming part 130,
The bending plate 111 is punched using a punching means to form a cutting slit 131 from the inside of the bending plate 111 to the outside on the back surface of the through hole 112 formed to penetrate the bending plate 111, so that the through hole ( 112) is formed so that the cutting slit 131 is formed together,
The cutting slit 131 is a method in which the shear connecting reinforcing bar 121 reinforced so as to pass through the through hole 112 is pressed and fixed to the back side of the bending plate 111. The shear connecting reinforcing bar 121 is embedded in the inner formwork 110 A precast hollow column structure to be fixedly installed on the back surface of the bent plate member 111 of the According to claim 1,
The PC concrete 150,
It is poured and cured using the outer formwork 140,
The outer formwork 140 is a form in which the reinforcing bar network 120 and the embedded inner formwork 110 integrally reinforced in the embedded inner formwork 110 are located inside the PC concrete 150 as a formwork. , a precast hollow column structure that is demolded after curing to enable the production of the precast hollow column structure 100 in a factory. According to claim 1,
In the hollow part (S), filled concrete 160 is further poured,
The filling concrete 160 is filled into the hollow part S of the precast hollow column structure 100 and poured so that the shear connecting reinforcing bars 121 of the reinforcing bar network 120 are buried. A precast hollow column structure to be poured after the precast hollow column structure 100 is brought into the field and set. (a) in the factory, the cutting slit 131 formed from the inside of the hollow part (S) to the outside while forming the through hole 112 to penetrate the bending board 111 is formed on the back surface of the bending board 111 manufacturing an embedded inner formwork (110);
(b) forming a fixed end forming part 130 by pressing and fixing the cut slit 131 formed on the rear surface of the bending plate 111 to the shear connecting reinforcing bar 121 penetrating the through hole 112 in the factory;
(c) in the factory, the shear connecting reinforcing bar 121 reinforced so that the end extends to the outside of the bending plate 111 through the through hole 112 of the bending plate 111 across the hollow portion S to the column structure Reinforcing the reinforcing bar network 120 in the embedded inner formwork 110 using the reinforcing bar 122;
(d) In the factory, the outer formwork 140 is installed so that the embedded inner formwork 110 and the reinforcing bar network 120 are located inside, and the PC concrete 150 is installed with the outer formwork 140 and the embedded inner formwork ( 110) pouring and curing between; and
(e) when the PC concrete 150 is cured, demolding the outer formwork 140 and transporting the precast hollow column structure 100 to the site for construction; Precast hollow column structure construction method comprising a. 10. The method of claim 9,
Step (e) is,
Set up and set the precast hollow column structure 100 in which the shear connection reinforcing bar 121 is exposed to the hollow part (S) perpendicular to the upper surface of the base plate at the site,
As the filled concrete 160 is poured into the hollow part S so that the shear connecting reinforcing bar 121 is buried, the reinforcing bar network 120 exposed to the hollow part S is filled with the filled concrete 160 and the precast hollow column. A precast hollow column structure construction method in which the structures 100 are integrated with each other to be constructed as a column structure.

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