KR102383548B1 - Pre-cast deck with inner void and construction method thereof - Google Patents

Abstract

In the precast method, the deck is simply assembled and manufactured using the hollow continuum to form the lower plate and hollow part, mounted on the column-beam structure, reinforced with the base plate reinforcement, and the floor plate concrete is poured to the floor plate of the building. Disclosed are a precast hollow deck and a method for constructing the same, the precast hollow deck comprising: a hollow part (S) pre-fabricated in advance to form a hollow part (S) on the inside by the upper plate at the top of both flanges in the form of a cap; and a lower plate in the form of a plate in which the lower ends of both flanges of the hollow extended portion disposed on the lower plate mold are embedded by the poured lower plate concrete and integrated so that the hollow extended portion extends in the longitudinal direction on the upper surface.

Description

Precast hollow deck and its construction method {PRE-CAST DECK WITH INNER VOID AND CONSTRUCTION METHOD THEREOF}

The present invention relates to a precast hollow deck and a construction method therefor. More specifically, in a precast method, the deck is assembled with each other using a hollow continuum to form a hollow part manufactured separately from the lower plate to secure manufacturing efficiency, and after mounting on a column-beam structure, concrete It relates to a precast hollow deck installed so that the floor plate of a building can be constructed by pouring and a construction method therefor.

Figure 1a is a conventional column-shows an exemplary view of the deck construction of the beam structure.

That is, in constructing a building, it can be seen that the steel frame member is constructed as the pillar 11, and the steel beam 12 is installed horizontally on the pillar 11, and the steel beam 12 side has a steel deck ( It is installed so that the end of the Steel Deck, 13) is supported, and after reinforcing the bottom plate reinforcement 14 on the upper surface of the steel deck 13, the bottom plate concrete 15 is poured to construct a floor plate of a certain thickness. can be known

Accordingly, when materials made of steel columns (11), steel beams (12), and steel decks (13) are used, the cost increases, but processing is easy and the self-weight is not large, so constructability and workability are sufficiently secured. There are advantages to being able to do it.

Figure 1b shows an exemplary view of a conventional precast hollow deck.

That is, it can be seen that the steel deck is also used, but the precast concrete deck 20 formed with the hollow part S to reduce its own weight is also used.

It can be seen that the precast concrete deck 20 can use concrete in which the reinforcing bar 23 is embedded, and the side connection plate 21 uses steel so that the side surfaces can be fitted with each other. .

This precast concrete deck 20 is provided with a hollow part (S) extending in the longitudinal direction in the body part 22 in the form of a horizontal plate in the form of a rectangular wall having a certain thickness,

Because it is manufactured in a factory, it is necessary to have a simple cross-sectional shape for mass production, so it is possible to sufficiently secure economic feasibility through mass production, but there is a problem that there is a limit in securing flexural rigidity as the extension length becomes longer, and it is necessary to separately equip the factory facilities There is a limit that the initial equipment cost for this is excessive.

Korean Patent No. 10-1779449 (Title of the invention: Hollow box-type steel assembly beam and structure construction method using the same, publication date: September 18, 2017) Republic of Korea Patent Laid-Open Patent No. 10-2014-0108353 (Title of the invention: Integrity improvement with top layered concrete using rebar for shear reinforcement and shear strength improvement structure of hollow slab and construction method using the same, Publication date: September 11, 2014 One) Republic of Korea Patent Publication No. 10-2019-0001383 (Title of the invention: PC hollow slab manufactured by extrusion and reinforced by shear, publication date: January 04, 2019)

Therefore, the present invention is a method in which the precast concrete deck is manufactured separately from the lower plate in a precast method and the hollow continuous part is integrated with each other (assembly manufacturing). It is an easy and technical task to solve the provision of a precast hollow deck and its construction method that can secure structural advantages by reinforcing the hollow extension as the extension length increases.

Precast hollow deck for achieving the above task,

Hollow extension part manufactured in advance so that a hollow part (S) is formed inside by the upper plate of the upper part of both flanges in the form of a cap; and a lower plate in the form of a plate in which the lower ends of both flanges of the hollow extended portion disposed in the lower plate mold are embedded by the poured lower plate concrete so that the hollow extended portion having the hollow portion (S) formed on the upper surface extends in the longitudinal direction; To be formed by assembling and installing the pre-fabricated hollow performance extension on the lower plate,
The pre-fabricated hollow extension part is provided with a bottom plate mold 310 in the form of a horizontal plate, and serves as an internal formwork and uses a cap-shaped hollow extension mold according to the cross-sectional shape of the inner bulkhead and longitudinal ribs as the bottom plate mold. set in the , and reinforced with a hollow reinforcing bar to surround the hollow long length mold, fixed a side formwork jig to the lower end of both flanges of the hollow long piece mold, and a side spaced apart from the hollow long piece mold using the side formwork jig After setting the formwork, pouring and curing the hollow concrete so that the hollow reinforcing bars are embedded between the hollow long length mold and the side formwork, and then demolding the side formwork, the hollow reinforcing bars are external from both flanges of the hollow length extension part. It is drawn out to serve as a connecting reinforcing bar when pouring concrete on the lower plate.

Precast hollow deck construction method for achieving the above task,

(a) installing the column structure and the beam; (b) a hollow extension part manufactured in advance so that a hollow part (S) is formed on the inside by the upper plate of the upper plate of both flanges in the form of a cap between the beams; and a lower plate in the form of a plate in which the lower ends of both flanges of the hollow extension part having the hollow part (S) disposed on the lower plate mold are embedded by the cast lower plate concrete and integrated so that the hollow extension part extends in the longitudinal direction on the upper surface; Mounting a precast hollow deck to be formed by assembling and installing the pre-fabricated hollow performance extension on a lower plate; (c) inserting and reinforcing the bottom plate reinforcing bar using the reinforcing bar support groove exposed on the upper surface of the inner bulkhead extending in the transverse direction to the hollow portion (S) of the hollow extension; and (d) pouring concrete for the sole to be embedded in the upper surface of the precast hollow deck so that the reinforcement for the sole is embedded; and setting a hollow long-length mold in the form of a cap according to the cross-sectional shape of the inner bulkhead and longitudinal ribs while serving as an inner formwork in the bottom plate mold, and reinforcing hollow reinforcing bars so as to surround the hollow long-running mold, A side form jig is fixed at the lower end of both flanges of the hollow elongated mold, and a side formwork spaced apart from the hollow elongated mold is set using the side formwork jig, and a hollow reinforcing bar is formed between the hollow elongated mold and the side formwork. After pouring and curing the hollow concrete to be buried, it is manufactured by demolding the side formwork, and the hollow reinforcement is drawn out from both flanges of the hollow extension to serve as a connecting reinforcement when the lower plate concrete is poured.

The present invention prepares the hollow length of the precast hollow deck in a U-shaped cross-section (cap shape) in advance, but forms an inner bulkhead to reinforce the middle of the hollow length, and forms a rebar support groove on the upper surface of the inner bulkhead. By allowing it to act as a support groove, it is possible to provide a precast hollow deck that can secure structural rigidity and improve the efficiency of floor plate construction.

In addition, since it uses a method of arranging a plurality of pre-fabricated hollow long extensions to form a hollow part (S) in the lower plate mold and pouring the lower plate concrete so that the lower plate and the hollow extension part are integrated, the self-weight of the deck due to unnecessary cross-section is increased. By excluding factors, it becomes possible to provide a more efficient precast hollow deck.

In addition, a longitudinal rib is formed on the upper plate of the hollow extension part so that it is advantageous in securing flexural rigidity according to an increase in the cross-sectional height by a structural effect of moving the neutral axis of the precast hollow floor plate upward, thereby securing structural efficiency. It becomes possible to provide a cast hollow deck.

In addition, the internal bulkhead installed in the middle of the hollow long length part has a reinforcing bar support groove formed on the upper surface so that the bottom plate reinforcement can be reinforced while the bottom plate rebar is inserted, and the hollow long length part is advantageous to secure the composite performance with the floor plate concrete, but , it is possible to provide a precast hollow deck that can be manufactured with an optimized cross section by the internal bulkhead and longitudinal ribs for the hollow extension part.

Figure 1a is a conventional column-beam construction example of a floor plate construction
Figure 1b is an exemplary view of a conventional precast hollow bottom plate,
Figures 2a and 2b is a configuration perspective view and construction example of the precast hollow deck of the present invention,
Figures 3a and 3b is a manufacturing flow chart of the hollow performance extension and precast hollow deck of the present invention,
Figure 4 shows a flow chart of the construction method of the precast hollow deck 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 deck 100 of the present invention]

Figures 2a and 2b is a configuration perspective view and construction example of the precast hollow deck 100 of the present invention, Figures 3a and 3b is a view showing a manufacturing flow chart of the hollow and precast hollow deck of the present invention.

Referring to FIG. 3b, the precast hollow deck 100 of the present invention is integrated with a plurality of hollow extension parts 120 having a U-shaped cross section separately manufactured on the lower plate 110 to be spaced apart from each other.

Unlike the conventional rectangular parallelepiped form, the hollow extension 120 is formed in the upper surface of the lower plate 110 in the form of a cap protruding upward, thereby eliminating the factor of increasing self-weight due to the unnecessary concrete cross-section,

The lower plate 110 is to be formed in the form of a plate material with a minimized thickness by further installing a tension member in order to secure bending rigidity in the longitudinal direction.

In addition, the lower plate 110 is integrated with each other by first setting the hollow extension 120 in the lower plate mold 360, pouring the lower plate concrete to a certain thickness, and using only the formwork corresponding to the thickness of the lower plate. can be optimized.

In addition, the hollow extended portion 120 is a U-shaped cross-section, so that both flanges 121 are connected to the upper plate 122 to the lower plate 110 so that the hollow part (S) is formed on the inside, and the vertical part of the upper plate is attached to the upper plate to increase bending rigidity. Directional ribs 140 are further formed.

In addition, in the hollow part (S) of the hollow extension part 120, an inner partition wall 130 extending in the transverse direction is further formed in the middle in the longitudinal direction to be reinforced, and the inner partition wall supports the reinforcing bar exposed on the upper surface. The groove is further formed so that the bottom plate reinforcement can be inserted and reinforced.

It is possible to improve the workability and constructability of the reinforcing bar of the base plate, and it is possible to secure the composite performance of the base plate concrete, the lower plate 110 and the hollow extension part 120 .

Accordingly, the precast hollow deck 100 of the present invention includes a lower plate 110 , a hollow extended portion 120 , an inner bulkhead 130 , and a longitudinal rib 140 as shown in FIGS. 2A and 2B .

It can be seen that the lower plate 110 is formed in the form of a plate material in which the hollow extension 120 is integrated with the upper surface, as shown in FIGS. 2A and 2B . It has a constant transverse width and is in the form of a rectangular plate extending in the longitudinal direction.

Referring to Figure 3b, the lower plate concrete is formed by pouring it into the lower plate mold 360, and by forming a plate material that is not a large thickness, the factor of increasing self-weight is excluded, and longitudinal prestress is generated using a tension material (not shown) inside. can be introduced.

That is, in a state in which the tension material is previously tensioned on the upper surface of the lower plate mold 360, the tension material is released after the lower plate concrete is poured and cured to introduce prestress, which is advantageous in securing flexural rigidity.

In addition, the lower plate 110 is formed by installing a sheet-shaped wire mesh (370, made of steel) in the lower plate mold 360 in the lower plate mold 360, assembling the lower plate shear reinforcement 380, and pouring the lower plate concrete, referring to FIG. 3B. It can be seen that those made of reinforced concrete are used.

Next, in the hollow extension 120, as shown in FIGS. 2A and 2B, the upper plate 122 is integrated with each other between the upper ends of both flanges 121 on the upper surface of the lower plate 110, and both flanges 121 and the upper plate 122. It is a C-shaped cross-sectional member in the form of a cap so that the hollow part (S) is formed inwardly.

The hollow extension part 120 is separately manufactured by a precast method, and is formed to be additionally integrated (assembled and installed) with the lower plate 110 .

That is, in the conventional precast hollow deck, the hollow tube and EPS block were set on the upper surface of the lower plate, and concrete was poured so that the hollow tube and the EPS block were buried.

In the present invention, after the hollow extension 120 is manufactured in advance by a precast method, the lower plate concrete is poured in the lower plate mold 360 so that the lower ends of both flanges 121 of the hollow extension 120 are supported. It is manufactured so that only the lower ends of both flanges 121 are buried, and the conventional expensive precast hollow deck equipment is not required according to the use of the conventional lower plate mold 360 .

In addition, it can be seen that the longitudinal rib 140 extending in the longitudinal direction is formed on the bottom surface of the upper plate 122 of the hollow extension 120 to protrude downward.

Accordingly, the hollow extension 120 has a concrete cross section corresponding to the longitudinal rib 140 is further formed, so that the neutral axis moves upward and the cross-sectional height increases (increasing the effect of introducing prestress as the tension material and the neutral axis are more spaced apart) Structural efficiency can be secured.

In addition, the hollow extension 120 further forms an inner partition wall 130 extending in the transverse direction while penetrating the longitudinal rib 140 downward to effectively reinforce the hollow extension 120 extending in the longitudinal direction. will do

FIG. 3A shows a manufacturing flow diagram of the hollow extension 120 having the inner partition wall 130 and the longitudinal ribs 140 .

That is, after providing the bottom plate mold 310 in the form of a horizontal plate, the hollow portion S in the form of a cap according to the cross-sectional shape of the inner partition wall 130 and the longitudinal rib 140 while serving as an inner mold is formed. The extension part mold 320 is set in the bottom plate mold 310 , and the hollow part reinforcement 330 is reinforced to surround the hollow part extension part mold 320 .

Accordingly, the side formwork jig 340 is fixed at the lower end of both flanges of the hollow extension mold 320, and the side formwork 350 spaced apart from the hollow extension mold 320 is set using the side formwork jig 340, and ,

It can be seen that after pouring and curing the hollow concrete so that the hollow reinforcing bar 330 is buried between the hollow extension mold 320 and the side formwork 350, it can be manufactured by demolding the side formwork 350. .

At this time, the hollow reinforcing bar 330 is drawn out from both flanges 121 of the hollow extension 120 to serve as a connecting reinforcing bar when the lower plate 110 concrete is poured.

Next, as shown in FIGS. 2A and 2B , the inner partition wall 130 is integrally formed with the hollow extended portion 120 during manufacturing, and a plurality of them are formed to be spaced apart from each other according to the longitudinal extension length of the hollow extended portion 120 . , the inner partition wall 130 is a hollow portion (S) formed inside the hollow extension 120, extending downward from the upper plate 122 of the hollow extension 120, integrally formed between the upper ends of both flanges 121 It is a transverse bulkhead.

The internal partition wall 130 is extended downward to be positioned at the upper part with respect to the hollow part S, so that structural efficiency according to an increase in the cross-sectional height can be provided together with the longitudinal rib 140 .

The inner bulkhead 130 is manufactured by using a mold 320 for a hollow extension having a groove formed downward according to FIG. 2A, but a vertical groove-shaped reinforcing bar support groove is further formed on the upper surface of the inner bulkhead 130 to reinforcing the bottom plate. It is desirable to use it for the reinforcement of

Next, the longitudinal rib 140 extends in the longitudinal direction in a form protruding from the bottom surface of the upper plate 122 of the hollow extension 120, as shown in FIGS. 2A and 2B, while reinforcing the hollow extension 120. By extending downward to be positioned at the upper portion with respect to the hollow portion S together with the inner partition wall 130, it is possible to provide structural efficiency according to an increase in the cross-sectional height.

Accordingly, according to FIG. 3b , it is possible to confirm the manufacturing flow chart of the precast hollow deck 100 by the lower plate 110 and the hollow extension 120 having the inner partition wall 130 and the longitudinal rib 140 of the present invention. .

That is, after providing the lower plate mold 360 in the form of a horizontal plate, the wire mesh 370 is installed on the upper surface of the lower plate mold 360 by using a spacer to be spaced upward, and the wire mesh 370 in the longitudinal direction. It can be seen that the lower plate shear reinforcing bar 380 which extends to and is formed to be drawn out from the upper surface of the lower plate 110 is reinforced.

At this time, although not shown, the tension member may be disposed using a spacer to be spaced apart from the wire mesh 370 upward, and the pre-stress may be introduced in a pre-tension manner.

Accordingly, it can be seen that a plurality of hollow extension units 120 are set in such a way that the connecting reinforcing bars of the hollow long extension 120 in the form of a cap that are separately manufactured in advance are connected to the wire mesh 370, and the shear reinforcing bars 380 ), it can be seen that the shear reinforcing bar 380 is positioned between both flanges of the set hollow extension 120 .

After installing the lower plate formwork (not shown), the lower plate concrete is poured, but the shear reinforcing bar 380 is exposed so that the upper part is exposed, and the lower end of both flanges of the lower plate 110 and the hollow extension part 120 are integrated with each other.

Accordingly, it can be seen that when the lower plate concrete is cured, the precast hollow deck 100 can be manufactured by the final lower plate 110 and the hollow extension 120, and the upper end is between both flanges of the hollow extension 120. The concrete is formed so that the shear reinforcing bar 380 exposed to the outside is buried, so that it is possible to reinforce the space between the hollow extension parts 120 .

Accordingly, according to FIG. 4, the precast hollow deck 100 of the present invention manufactured according to the present invention is manufactured by a precast method between the inside of the column structure 410 after installing the column structure 410 manufactured in the precast method. It can be seen that the construction is carried out in such a way that the beams 420 are installed, and the precast hollow deck 100 lifted between the beams 420 is mounted.

[Precast hollow deck 100 construction method of the present invention]

Figure 4 shows a flow chart of the construction method of the precast hollow deck 100 of the present invention.

The construction method of the precast hollow deck 100 is installed by mounting the precast hollow deck 100 as described above on the column-beam structures 410 and 420,

It can be said that it is a method of constructing the floor plate of a building by pouring the floor plate concrete after reinforcing the floor plate reinforcement.

Accordingly, according to FIG. 4 , it can be seen that a plurality of column structures 410 are installed first, and the column structures 410 can also use a reinforced concrete column structure manufactured by precast, and between the upper ends of the column structures 410 . By installing so that the end of the e-beam 420 is supported, it can be seen that the column-beam structure is being constructed.

Next, according to FIG. 4, it can be seen that after installing more scaffolding between the floor and the beams 420, the precast hollow deck 100 of the present invention is installed between the beams 420 to be supported. At this time, the portion supported by the beam 420 in the precast hollow deck 100 may be approached in such a way that only the lower plate 110 is further extended.

Next, according to FIGS. 2A and 4 , the bottom plate reinforcement (not shown) is reinforced in a manner in which the bottom plate reinforcement (not shown) is inserted into the reinforcement support groove of the precast hollow deck 100, and the bottom plate reinforcement is reinforced and the exposed shear reinforcement is used on the floor By pouring the plate concrete, the final floor plate composite construction is completed.

The description of the present invention described above 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 dispersed form, and likewise components described as distributed may 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 deck
110: lower plate
120: hollow extension 121: both flanges
122: upper plate 130: internal bulkhead
140: longitudinal rib
310: bottom plate mold 320: hollow mold
330: hollow reinforcing bar 340: side formwork jig
350: side formwork 360: lower plate mold
370: wire mesh 380: shear reinforcement
410: column structure 420: beam

Claims (10)

a hollow extension 120 pre-fabricated such that a hollow portion S is formed on the inside by the upper plate 122 at the top of both flanges 121 in the form of a cap; and
The lower plate in the form of a plate material in which the lower ends of both flanges of the hollow extended portion 120 disposed in the lower plate mold are embedded by the poured lower plate concrete so that the hollow extended portion 120 is extended in the longitudinal direction on the upper surface of the lower plate 110; includes,
The pre-fabricated hollow part (S) is formed by assembling and installing the hollow extension part (120) on the lower plate (110),
The pre-fabricated hollow extension 120 includes a bottom plate mold 310 in the form of a horizontal plate, and serves as an internal mold, and has a cap shape according to the cross-sectional shape of the internal partition wall 130 and the longitudinal rib 140 . Set the hollow long length mold 320 of the bottom plate mold 310, and reinforce the hollow reinforcing bar 330 to surround the hollow long length mold 320, and The side formwork jig 340 is fixed at the lower end of both flanges, and the side formwork 350 spaced apart from the hollow extension mold 320 is set using the side formwork jig 340, and the hollow extension extension mold 320. After pouring and curing the hollow concrete so that the hollow reinforcing bar 330 is buried between the side formwork 350 and the side formwork 350, it is manufactured by demolding the side formwork 350,
The hollow reinforcing bar 330 is a precast hollow deck that is drawn out from both flanges 121 of the hollow extension 120 to serve as a connecting reinforcing bar when the lower plate 110 concrete is poured. According to claim 1,
The hollow performance extension unit 120,
The inner partition wall 130 extending in the transverse direction to the hollow part (S) of the hollow extension part 120 is further formed in the middle based on the longitudinal direction,
The inner bulkhead 130 is a precast hollow deck that has a reinforced support groove exposed on the upper surface so that the bottom plate reinforcement can be inserted and reinforced. According to claim 1,
The hollow performance extension unit 120,
As a protruding form on the bottom surface of the upper plate 122 of the hollow extended portion 120, it extends in the longitudinal direction to reinforce the hollow extended portion 120 and to be located at the upper portion with respect to the hollow portion (S) together with the inner partition wall 130. A precast hollow deck in which longitudinal ribs 140 are further formed to provide structural efficiency according to an increase in cross-sectional height by extending downward. delete According to claim 1,
The pre-fabricated hollow performance extension 120 is,
and a lower plate mold 360 in the form of a horizontal plate,
The lower plate shear reinforcement 380 extending in the longitudinal direction and drawn out from the upper surface of the lower plate 110 is reinforced in the wire mesh 370 installed to be spaced upwardly on the upper surface of the lower plate mold 360,
The connection reinforcing bar of the hollow extension unit 120 manufactured in advance is connected to the wire mesh 370 to set a plurality of hollow extension units 120,
The shear reinforcing bar 380 is positioned between both flanges 121 of the set hollow extension 120,
A precast hollow deck in which the lower plate concrete is poured, but the shear reinforcement 380 is exposed so that the upper part is exposed, and the lower plate 110 and the lower ends of both flanges of the hollow extension part 120 are integrated with each other. delete (a) installing the column structure 410 and the beam 420;
(b) a hollow extension 120 pre-fabricated such that a hollow portion S is formed on the inside by the upper plate 122 of the upper end of both flanges 121 in the form of a cap between the beams 420; and a lower plate in the form of a plate in which the lower ends of both flanges of the hollow extended portion 120 disposed in the lower plate mold are embedded by the poured lower plate concrete so that the hollow extended portion 120 extends in the longitudinal direction on the upper surface thereof; includes,
In the step (b), mounting the precast hollow deck 100 so as to be formed by assembling and installing the hollow extension portion 120 in which the hollow portion (S) is formed in advance on the lower plate 110; , the pre-fabricated hollow extension 120 of step (b) includes a bottom plate mold 310 in the form of a horizontal plate, and serves as an inner mold, and is formed of the inner partition wall 130 and the longitudinal rib 140 . A hollow long-length mold 320 in the form of a cap according to a cross-sectional shape is set on the bottom plate mold 310, and a hollow reinforcing bar 330 is reinforced to surround the hollow long-length part mold 320, and the hollow long length The side formwork jigs 340 are fixed to the lower ends of both flanges of the sub-mold 320, and the side formwork 350 spaced apart from the hollow extended extension mold 320 is set using the side formwork jigs 340, and the hollow After pouring and curing the hollow concrete so that the hollow reinforcing bar 330 is embedded between the extension mold 320 and the side formwork 350, the side formwork 350 is demolded and the hollow reinforcing bar 330 is manufactured. ) is a precast hollow deck construction method that is drawn out from both flanges 121 of the hollow extension 120 to serve as a connecting reinforcing bar when the lower plate 110 is poured concrete. 8. The method of claim 7,
After step (b),
(c) inserting and reinforcing the bottom plate reinforcing bar using the reinforcing bar support groove exposed on the upper surface of the inner bulkhead 130 extending in the transverse direction to the hollow part (S) of the hollow extension part 120; and
(d) pouring concrete floor plate so that the floor plate reinforcement is embedded in the upper surface of the precast hollow deck 100; Precast hollow deck construction method further comprising a. 8. The method of claim 7,
The hollow performance extension unit 120 of step (b) is,
As a protruding form on the bottom surface of the upper plate 122 of the hollow extended portion 120, it extends in the longitudinal direction to reinforce the hollow extended portion 120 and to be located at the upper portion with respect to the hollow portion (S) together with the inner partition wall 130. A precast hollow deck construction method using a longitudinal rib 140 to be further formed so as to extend downward to provide structural efficiency according to an increase in cross-sectional height. 8. The method of claim 7,
Precast hollow deck construction method using the reinforced concrete column structure and beam 420 manufactured by precasting the column structure 410 and the beam of the step (a).

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