JPH10121573A - Half-precast concrete member and construction method of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a structure, reducing the number of PCa members applied and using PCa members which can be constructed without use of outside scaffolds or the like and half-PC members used for the construction. SOLUTION: Half-PC members H composed of gate-shaped thin plate members in which the reinforcement part positioned at the outer peripheral side in the column reinforcements and the beam reinforcements is embedded so that a pair of column reinforcements 4, 5 oppositely arranged with a specifeid distance are integrally formed with beam reinforcements 7, 9 arranged astride over the column reinforcements 4, 5, are erected so as to paralelly arrange. And reinforcements connecting mutual column parts adjacent to each other of the adjacent half-precast concrete members, are arranged. Subsequently, concrete for the columns is placed up to the height of the end of the underfloor. Floor slabs are supported on the upper ends of columns constructed by placing concrete to construct slabs or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a half precast concrete (hereinafter referred to as "half PC") member and a method of constructing a structure using the precast concrete using the half PC member.

[0002]

2. Description of the Related Art Precast concrete (hereinafter, referred to as PCa) is a structure in which the outer periphery of a structure is made of a reinforced concrete column-beam structure, and a large space is secured by using only a floor without a beam inside. In the case of building by assembling members, conventionally, PCa is formed in advance for each part, such as a PCa column member, a PCa beam member, and a PCa floor member.

[0003] Then, the PC is provided between the PCa columns which are erected.
a After arranging a beam member horizontally, arranging a column hoop, etc. at the column-beam joint at the site, placing a formwork around the entire outer periphery of the column-beam joint and placing concrete. To join the PCa column member and the PCa beam member. A slab is constructed by laying PCa floor members between the beams.

[0004] This is sequentially performed to sequentially build the upper part of the structure.

[0005]

However, in general, the length of the PCa column member is the length from the upper surface of the floor to the lower end surface of the beam on the upper floor, and the end of the PCa beam member has a PCa column. Because it is a member configuration with a length of about several centimeters placed on the upper end surface of the member, as described above, at the site, reinforcement is arranged at the beam-column joint and concrete placing work is performed. The joints at the outer peripheral portion may not be aligned.

At this time, a scaffold is also required on the outer peripheral side of the structure for this operation, such as the need for a side formwork on the outer peripheral side of the structure. That is, since an external scaffold is required, the higher the floor to be constructed, the lower the work safety.

Further, assuming that the exterior wall of the structure is to be finished with tiles or stones, a PCa member having a PCa column member or a PCa beam member in which a finishing material such as a tile is driven into the surface constituting the outer surface of the structure. Even if is used, there are many joints at the beam-column joint,
Alternatively, it is necessary to use a driving form in which these materials are driven in advance.

[0008] At this time, when the tiles and the like are stuck on the site, it is necessary to install a formwork inside the finishing surface of the PCa column member and leave a margin for the tiles and stones. In this case, P
There are problems such as the necessity of increasing the cross section of the Ca column.

Further, in the above-mentioned conventional construction, since the shape of the PCa column member is such that the entire column cross section is made into PCa, the weight per piece of the PCa column member increases. As a result,
There is also a problem that a large lifting machine is required to build the PCa member.

Furthermore, as described above, each part is individually
When it is composed of the member a, the number of PCa members used increases. As a result, the time and man-hours required for assembling the PCa member are increased, which is disadvantageous in terms of shortening the construction period.

In addition, a method of assembling a formwork, arranging reinforcement, and placing concrete on site to construct a column or a beam without using a PCa member can be considered. In this case, however, many skilled skills are required. Need temporary workers and temporary equipment
There are problems in various aspects such as working environment, safety, construction period, quality, etc., and it is required to solve these problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to reduce the number of PCa members to be used and to provide a structure using a PCa member that can be constructed without using an external scaffold or the like. It is an object to provide a construction method and a half PC member used for the construction.

[0013]

In order to solve the above-mentioned problems, a half precast concrete member according to the first aspect of the present invention comprises a pair of column reinforcing bars opposed to each other at a predetermined interval and a pair of column reinforcing bars. It is composed of a gate-shaped thin plate-shaped member in which a reinforcing bar portion of the column reinforcing bar and the beam reinforcing bar located on the outer peripheral side of the structure is embedded so as to be integrally formed with the beam reinforcing bar straddling. I have.

[0014] According to the present invention, by forming a thin plate,
The weight reduction of the PCa member is achieved. In addition, since the beam-to-column joints are integrated on the outer peripheral side of the structure, there is no need to perform work for beam-to-column joints from the outer peripheral side of the structure, such as installation of formwork on the outer peripheral side of the building. become.

Next, according to a second aspect of the present invention, in contrast to the first aspect, the precast concrete of the beam portion has an L-shaped cross section with its lower portion projecting toward the inner peripheral side of the structure. It is characterized by:

According to the present invention, a bottom formwork for beam construction is not required, and the number of support portions of the floor slab can be increased. Next, the invention according to claim 3 is different from the structure according to claim 1 or claim 2 in that at least one of the upper end and the lower end of the pillar main bar embedded in concrete has an upper layer or a lower layer. It is characterized by having a connection hardware for connection with the column reinforcing bar.

In the present invention, the provision of the connecting hardware facilitates the connection between the column main reinforcements of the upper and lower half precast concrete members. Next, in the construction method of a structure according to the invention described in claim 4, the half precast concrete members according to any one of claims 1 to 3 are constructed so that the half precast concrete members are arranged side by side. After arranging reinforcing bars that connect adjacent column parts of the precast concrete member, cast concrete for the column up to the height of the floor bottom, and support the floor slab at the column top constructed by casting. It is characterized by.

In the present invention, the columns of adjacent half precast concrete members, which are arranged side by side, are integrated with a predetermined strength by reinforcing steel, and the concrete slabs of the cast column are joined by the floor slab. Is supported.

Next, the invention according to claim 5 is directed to claim 4
In contrast to the above configuration, the floor slab is a precast concrete plate, a hollow member is installed on the plate, and a slab is constructed by casting concrete.

In the present invention, the provision of the hollow member reduces the weight of the slab, and the slab can be made larger by that amount. Next, according to a sixth aspect of the present invention, in addition to the configuration of the fourth aspect, the floor slab is a reverse beam slab, and a double floor is constructed on the floor slab. .

In the present invention, by using a reverse beam slab having a reverse beam on the floor slab, the flexural rigidity of the floor slab is increased, and a large protrusion is not provided at the upper portion.
A double floor structure such as an OA floor can be adopted.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings. First, the configuration of the half PC member H will be described with reference to FIGS.

As shown in FIG. 1, the half PC main body has a thin, gate-like shape comprising a pair of pillars 1 facing each other at a predetermined interval and a beam 2 connecting the upper portions of the pillars 1 to each other. The length L1 in the lateral direction is designed to be one span between the center axes of the wall columns of the structure.

The width L2 of each pillar 1 is a width obtained by dividing the wall pillar on the outer peripheral surface side of the structure into two by the center axis of the wall pillar cross section.
The length L3 of the column 1 in the height direction is set to the same length as one layer from the beam top end of the floor to the beam top end of the upper floor.

As shown in FIG. 2, the thickness L4 of the column portion 1 is designed to be thin enough to bury the column main bar 4 on the outermost peripheral side of the structure. A part of the column hoop 5 (the outer peripheral portion of the structure), which is a part, is buried, and the column hoop 5 is also formed integrally with the column 1.

The column main reinforcement 4 buried in the column 1 is
The leg 4a is buried with the reinforcing metal fitting 6 attached thereto, so that it can be easily connected to the column head of the lower column reinforcing bar. Also, the column cap 4b of the buried column main bar 4
Protrudes from the top end of the column portion 1 by a predetermined length, and can be joined to the column main reinforcing bar 4 on the upper floor by a reinforcing metal joint or the like.

Further, a beam 2 connecting the pillars 1 is provided.
Also, as shown in FIGS. 1 and 3, the main body is designed to be thin with a thickness L5 such that only the main beam 7 on the outermost peripheral side of the structure is embedded. However, by providing a projecting portion 2a projecting inside the structure below the beam portion 2, the beam portion 2 has an L-shaped beam cross section as a whole.

That is, the lower part of the beam portion 2 has the entire beam width of the beam cross section and embeds all the lower end beam main reinforcements 7 and 8, and the overhang portion 2
The thickness L6 in the height direction of a is made into PCa so that the lower end of the floor slab supported by the beam portion 2 protrudes. In addition, the overhang portion 2a is formed up to the surface of both pillars 1 that is in contact with the beam 2.

Further, a part of the beam stirrup 9 (the outer peripheral portion of the structure) is also buried in the beam 2 and is formed integrally with the beam 2. Here, both ends of the beam main reinforcement 7 on the outermost periphery side of the structure embedded in the beam portion 2 are embedded in the upper portion of the column portion 1 (column-beam joint portion). Both end portions 8a of the beam main reinforcement 8 buried in the other beam portions 2 are exposed.

Next, the construction of a structure using the PCa member composed of the half PC member H having the above configuration will be described. The column heads of the column reinforcing bars of the lower floor projecting from the top end of the column portion 1 of the lower floor portion constructed in advance, and the legs 4a of the column main reinforcing bars 4 of the half PC member H installed on the target floor are reinforced. It is erected so as to be joined with the joint hardware 6. By assembling them so as to be adjacent to each other sequentially along the outer peripheral surface of the structure (see FIG. 8 or FIG. 9), the half PC
The member H forms the outer peripheral surface of the structure on the target floor.

At this time, one wall column is constituted by two adjacent column portions 1 of the adjacent half PC member H.
As shown in FIG. 4, the exposed portions of the column hoops 5 integrated with each of the adjacent column portions 1 are connected to each other by a reinforcing bar 10 made of a hoop.
Arrange 0 bars.

Further, the bar main bars 11 other than the column main bars 4 embedded in the column portion 1, that is, the column main bars 11 in the portion surrounded by the reinforcing steel bars 10 are arranged. The leg of the column main bar 11 is also joined to the column main bar 4 on the lower floor.

Further, as shown in FIG. 5, both end portions 8a of the main beams 8 at the lower ends of the beams, which are exposed from the adjacent half PC members H and are opposed to each other, are joined to each other at column-beam joint portions by enclosure welding or the like. Here, reference numeral 12 denotes a joint portion of eight main bars.

Next, the frame 13 inside the structure of the pillar 1
4 and FIG. 5 and FIG.
As shown in the figure, the floor bottom of the upper floor (the same height as the overhang 2a)
And the concrete 14 is poured to this height to integrate the columns divided by the column center axis. Here, regarding the above-mentioned formwork, since the pillar portion 1 itself functions as a formwork at the position of the structure outer peripheral portion, the formwork on the structure outer peripheral side becomes unnecessary.

Next, as shown in FIG. 6 and FIGS. 7 and 8, which are cross-sectional views of the beam portion 2, the upper end surface of the column constructed by casting and the projecting portion 2a of the beam portion 2 are formed. The half PC floor slabs 16 constituting the floor slab are laid out so as to be placed on the floor, and thereafter, the beam upper main reinforcement 17 and the floor reinforcement 18 are performed, and after the formwork 19 for the beam and the beam-column joint is attached. Then, concrete 20 for floors and beams is cast to construct a layer portion to be a target of the structure.

At this time, since the pillar portion 1 and the beam portion 2 have a role of a formwork on the outer peripheral side of the structure, there is no need to install a formwork on the outer peripheral side of the structure. Here, the slab of the above embodiment is constructed by laying half PC floor slabs 16 and then casting concrete 20 therein. However, a hollow mold (hollow member) is placed on the half PC floor slab. By placing concrete after installation and providing a hollow portion in the slab, the weight of the slab may be reduced, thereby making it possible to construct a large slab without providing small beams. At this time, it is preferable to increase the bending strength of the slab by increasing the strength of the truss bars projecting from the half PC slab.

Alternatively, a prestressed concrete plate having a cavity in the floor slab itself may be employed as the floor slab to reduce the weight of the slab. Moreover, while using a reverse beam slab as the floor slab, the required bending rigidity of the slab may be ensured, and a double floor such as an OA floor may be constructed on the reverse beam slab.

The above construction is sequentially performed to construct a structure of a predetermined hierarchy. When a beam is provided in a direction orthogonal to the column 1, as shown in FIG. 9, a half PC member H in which a beam reinforcing bar 20 for connection protrudes in a direction orthogonal to the column 1 may be used. I just need.

As described above, when the structure is constructed as described above using the half PC member H of the present embodiment,
The outer surface of the half PC member H constitutes the outer wall of the structure, and the half PC member H
Since the joint portion between the column portion 1 and the beam portion 2 is integrated, it is not always necessary to attach a finishing member such as a tile to the outer wall portion of the column-beam joint portion that is constructed on site, unlike the related art. Accordingly, the structure does not need the thickness of the driving formwork as in the case of the conventional driving PCa formwork, so that the structure is composed only of a structurally necessary cross section. As a result, a rational design is possible in terms of the frame weight.

In addition, since there is no need to perform a mold work on the outside of the structure as in the related art, an external scaffold is not required. Therefore, a safe source of work can be ensured by that much. In addition, in the conventional method, since the joints of the PCa members are performed at the beam-column joints, when the finish on the outer side of the structure is tile or stone, the joints may be complicated and may not be aligned. However, in this embodiment, since the joining of the PCa members is performed only at the core of the wall pillar, the joints are on one line, and the joints are surely aligned.

Further, by using the half PC member H as described above as the PCa member, the column and beam portion 2 can be integrated with the P member.
Since it is a Ca member, the time and the number of steps required for assembling the PCa members are reduced. Therefore, the construction is simplified and the construction period for constructing the structure is shortened.

The PCa member is also a thin half PCa member in which only the outermost reinforcing bar of the structure is buried, so that the weight of the PCa member per piece is reduced, and the PCa member is lifted. A small lifting machine such as a crane used for assembling can be used.

Further, in the above description, the hoop rebar has been described as an example of the reinforcing bar 10 for connecting the adjacent column portions 1, but the present invention is not limited to the hoop rebar. In short, it is only necessary that the column hoop bars 5 and the like of the column portions 1 can be connected to each other. Therefore, a stirrup-shaped reinforcing bar or a U-shaped reinforcing bar may be used.

In the above-described embodiment, the cross section of the beam portion 2 of the half PC member H is L-shaped so that the floor slab 16 can be placed thereon. No need. However, when the section is L-shaped, the supporting portion of the floor slab 16 becomes larger, and the slab can be made larger by that amount.

Further, in the above-described embodiment, an example is described in which the connecting hardware is provided on the leg 4a of the column main reinforcing bar 4. However, the connecting hardware may be provided on the upper end of the column main reinforcing bar 4.

[0046]

As described above, when the half precast concrete member and the method of constructing a structure according to the present invention are employed, the weight of each PCa member is reduced and the number of PCa members used is reduced. I'm done. As a result, there is an effect that the assembling time is shortened and the construction period of the structure is shortened.

Further, joints for joining the outer peripheral portion of the structure are reduced, and even when a finishing material such as a tile is stuck on the outer wall, there is an effect that the finishing is eliminated.

Further, since the side formwork on the outer peripheral side of the structure is not required for constructing the beam-to-column joint on the outer peripheral side of the structure, there is no need for an external scaffold, and the construction safety is improved. .

Further, when the invention according to the second aspect is adopted, the formwork at the bottom at the time of constructing the beam becomes unnecessary, and the number of support portions of the floor slab is increased. There is an effect that it becomes possible.

Further, when the invention described in claim 3 is adopted, there is an effect that the connection of the upper and lower half PC members can be easily performed. Further, when the invention described in claim 5 is employed, the weight of the floor slab can be reduced, and there is an effect that a slab without small beams can be made large.

Further, when the invention according to claim 6 is adopted, a predetermined bending rigidity is secured to the floor slab by the inverted beam,
There is an effect that the floor slab can have a double floor structure while the size of the floor slab is large.

[Brief description of the drawings]

FIG. 1 is an overall view showing a half PC member according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a pillar portion of a half PC member according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a beam portion of the half PC member according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view for explaining joining between pillar portions of adjacent half PC members.

FIG. 5 is a cross-sectional view for explaining connection between column main bars of adjacent half PC members.

FIG. 6 is a vertical cross-sectional view for explaining joining between a pillar and a floor.

FIG. 7 is a vertical cross-sectional view for explaining joining between a beam portion and a floor.

FIG. 8 is an overall view showing the joining between a half PC member and a floor material.

FIG. 9 is an overall view showing a connection between a half PC member and a floor material.

[Explanation of symbols]

 H Half PC member 1 Column 2 Beam 2a Overhang 4 Column main reinforcement (column reinforcement) 5 Column hoop reinforcement (column reinforcement) 6 Connection hardware 7 Beam main reinforcement (beam reinforcement) 9 Stirrup reinforcement (beam reinforcement) 16 Floor slab

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI E04C 3/44 E04B 2/86 601M 601T 601C 611D 611H

Claims (6)

[Claims] 1. An outer peripheral side of a structure of a column reinforcing bar and a beam reinforcing bar so as to be integrally formed with a pair of column reinforcing bars and a beam reinforcing bar extending between the column reinforcing bars at a predetermined interval. A half precast concrete member comprising a gate-shaped thin plate-like member having a reinforcing bar portion embedded therein. 2. The half precast concrete member according to claim 1, wherein a lower portion of the precast concrete of the beam portion projects toward the inner peripheral side of the structure and has an L-shaped cross section. 3. A connection metal fitting for connecting with an upper or lower layer column main reinforcement at least at one of an upper end and a lower end of the column main reinforcement embedded in concrete. 2. The half precast concrete member according to 2. 4. A reinforcing reinforcing bar for constructing a half precast concrete member according to any one of claims 1 to 3 so as to be arranged, and connecting adjacent column portions of adjacent half precast concrete members. A method for constructing a structure, comprising: placing concrete for a column to the height of the lower end of the floor after placing the concrete, and supporting the floor slab at the upper end of the column constructed by the casting. 5. The floor slab is a precast concrete plate, a hollow member is installed on the plate, and a slab is constructed by casting concrete. How to build the structure. 6. The method according to claim 4, wherein the floor slab is a reverse beam slab, and a double floor is built on the floor slab.