JPH08113981A - Method for constructing concrete structure - Google Patents

Abstract

PURPOSE: To easily execute construction even in a narrow site and to reduce field work and to shorten a construction period by a method wherein a precast concrete column member, wherein a reinforcing bar extends upward, a beam member, and a floor member are combined and a shear reinforcement bar, beam upper end reinforcement bar, and other floor main reinforcement bar are arranged and concrete is placed. CONSTITUTION: A column member 10, wherein the upper ends of column main bars 18 protrude from a column body 16 and the lower ends thereof are inserted into sleeve joints 22, is erected on a floor 30. And a grout material is placed. Next, beam lower end bars are projected from the end surface of a beam main body and each end of beam members 12, in which hoop bars 20 are projected from the beam body, is placed on the adjacent column member 10. And precast floor members 14 are laid across the beam members 12. At the same time, beam lower end bars of the opposed beam members 12 are combined and shear reinforcement bars and beam upper end bars are arranged, following which concrete is placed on column beam joints, beam members 12, and floor members 14. Thus arranging and combining work of reinforcement bars can be reduced and construction can be performed even in a narrow site.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a concrete structure using pillar members, beam members and floor members made of precast concrete.

[0002]

2. Description of the Related Art Various methods for constructing a reinforced concrete building using a precast member have been proposed and are actually applied. However, the conventional construction method of this type has one of the problems that construction cannot be performed on a small site, there are many on-site works, and the construction period is long.

[0003]

[Problems to be Solved] An object of the present invention is to easily perform construction even in a small site, reduce the work on site,
It is to shorten the construction period.

[0004]

According to the method for constructing a concrete structure of the present invention, upper ends of a plurality of column main bars are projected upward from a column main body and lower ends of the respective column main bars are lower ends of the column main section. A plurality of pillar members made of precast concrete inserted in the sleeve joint arranged in the floor joint, and the pillar joints of the lower floor projecting upward from the floor are received in the sleeve joint, and the built-in grout material A plurality of beam members made of precast concrete in which a plurality of beam lower end bars are projected from each end surface of the beam main body and a plurality of stirrup bars are projected upward from the beam main body by injecting Place each end of each of the above on adjacent column members, and apply a plurality of floor members made of plate-shaped precast concrete with a plurality of reinforcing bars protruding upward from the floor main body to a plurality of beam members,
Floor member hanging Before, at the same time as, or after me, join the beam lower end reinforcements of the opposite beam members, place multiple shear reinforcements in the beam-column joint, and After placing the floor members, place another floor main bar on the floor member, and then add concrete to the beam-column joint, the beam member and the floor member. Including placing on top.

Since the pillar member, the beam member and the floor member are semi-finished products in which a part of the reinforcing bar is projected upward, they can be produced at the factory and assembled at the construction site. In addition, after arranging the pillar member, the beam member and the floor member, the beam upper end bar and other floor main bars are arranged,
With the beam member and floor member being a semi-finished product in which part of the reinforcing bar is projected upward, the beam upper end bar extends from one beam member to the other beam member through the beam-column joint to the other beam member. Can be placed on the floor, and other beam main reinforcements can be placed across multiple floor members, which significantly reduces on-site work such as reinforcing bar placement work and reinforcing bar joining work, and can be easily installed even in narrow spaces. can do. Further, the main parts of the pillar member, the beam member and the floor member act as a part of the formwork for placing concrete, so that the work of arranging the formwork is significantly reduced.

As described above, according to the present invention, a column member, a beam member, and a floor member, which are semi-finished products made of precast concrete that are semi-finished products in which a part of the reinforcing bars are projected upward, are used at the construction site. Assembling, arranging shear reinforcements, beam top reinforcements and other floor reinforcements, and then placing concrete, it can be easily installed even in a small site, reducing the work on site and shortening the construction period.

The grout material may be injected into the sleeve joint of each pillar member in a state where each pillar member is supported by a supporting means such as an oblique support, or before the grout material is injected, the grout material is supported by the supporting means. You may adjust the height. Also, the end of the beam member is placed on the beam receiver arranged on the upper side surface of the column main body,
In that state, the height of the beam members may be adjusted by the level adjusting means provided in the beam receiver so that the height levels of the lower end reinforcements to be connected are made to coincide with each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a plurality of pillar members 10 and a plurality of beam members 12 are used to construct a reinforced concrete building.
And a plurality of floor members 14 are used. All of these are made of precast concrete, and are manufactured in a factory, for example.

Referring to FIG. 2, each pillar member 10 includes a pillar main body 16 having a square pillar shape and made of concrete.
A plurality of column main bars 18 extending in the column main body 16 in the vertical direction and protruding further upward from the column main body 16, and a plurality of hoop muscles 20 embedded in the column main body 16 at intervals in the vertical direction. , Inside the pillar main body 16 and each of them is a pillar main bar 1
8 is a precast reinforced concrete column member including a plurality of sleeve joints 22 receiving the lower end of the column 8.

Most of the column main bars 18 are embedded in the column main body portion 16, and a part of each column main bar 18 crosses the column main beam portion 16 above the beam-column joint and the floor of the upper floor. And project upwards. Each sleeve joint 22 is arranged below the column main body 16 so as to extend in the vertical direction, and also opens below the column main body 16. Each sleeve joint 22 has a plurality of holes or passages 24 for venting air to form the pillar main body 1
It is communicated around 6, that is, laterally.

The column main body 16 has a joining cotter or recess 26, and a plurality of air vent grooves 28 for communicating the recess 26 with one sleeve joint 22, respectively, on the lower surface of the column main body 16. .

The recess 26 is formed in the center of the lower surface of the pillar main body 16.
In particular, it is formed inside a virtual loop that connects the pillar main bars 18 when viewed two-dimensionally, and is opened on the lower surface of the pillar main body 16.

Each groove 28 extends continuously from the recess 26 to the corresponding sleeve joint 22 and opens downward. Each groove 28 has substantially the same depth dimension as the recess 26 or a dimension deeper than the recess 26 over the entire length thereof. The groove 28 may allow the recess 26 to communicate with the outside of the column main body 16, that is, the side.

The floor 30 on which the pillar member 10 is built is provided with the same number of pillar main bars 32 as the pillar main bars 18 of the pillar member 10. Each pillar main bar 32 is a pillar main bar of a lower floor pillar, and therefore extends from the lower floor pillar so that the upper end portion projects upward from the floor 30.

Referring to FIG. 3, each beam member 12 has a square columnar beam main body 34 formed of concrete,
Includes a plurality of beam lower end ribs 36 that penetrate the lower portion of the beam main body 34 in the longitudinal direction and extend in parallel, and a plurality of stirrup ribs 38 that are arranged in the beam main body 34 at intervals in the longitudinal direction thereof. , A precast reinforced concrete beam member.

Each beam lower end reinforcement 36 is one of the beam main reinforcements,
In addition, it projects from both end faces of the beam main body 34. The length dimension of the projecting portion of the beam lower end reinforcement 36 from the beam main body portion 34 is preferably such that the beam lower end reinforcements 36 of the beam members 12 facing each other in the beam-column joint can be connected to each other. The beam main body 34 has a groove 40 that is open on the upper surface thereof and that extends continuously in the longitudinal direction. Most of each stirrup streak 38 is embedded in the beam main body 34 in a state where a part thereof projects upward from the beam main body 34.

Referring to FIG. 4, each floor member 14 includes a rectangular plate-shaped floor main body 42 formed of concrete, and a plurality of reinforcing bars 44 arranged in the floor main body. It is a reinforced concrete floor member. Each reinforcing bar 44 is a truss reinforcing bar in the illustrated example, and a part thereof projects upward from the floor main body 42. In the example shown in FIG. 4, the floor main bar 45 is shown as being arranged on the floor member 14. However, at least a part of the floor main bar 45 is attached to the floor member 1.
4 may be arranged in advance, and the rest of the main floor reinforcements or other main floor reinforcements, especially the main floor reinforcements orthogonal to the main floor reinforcements 45, may be assembled to the beam member and then arranged.

As shown in FIGS. 5 and 6, the beam member 12
Each beam receiver 46 for supporting the column member 10 includes a receiving member 48 arranged in the column main body 16. The receiving member 48 includes an elongated plate-shaped first portion 50 that is in contact with the upper outer surface of the pillar main body portion 16, and an elongated plate-shaped second portion that extends substantially horizontally from the upper edge of the first portion. 52, and an elongated plate-shaped third portion 54 extending substantially horizontally from the lower end edge of the first portion 50 on the same side as the second portion 52.

The receiving member 48 has a substantially U-shaped cross section by the first, second and third portions 50, 52 and 54, and ribs 56 are formed at a plurality of portions spaced in the longitudinal direction. It is reinforced by. The receiving member 48 may have an inverted L-shaped cross-sectional shape without the third portion 54.

The beam receiver 46 also includes a second member of the receiving member 48.
A plurality of holes 58 formed at intervals in the longitudinal direction of the portion 52, a plurality of elongated holes 60 formed at a distance in the width direction of the receiving member 48 in the first portion 50, and a second Part 5
2, a plurality of nuts 62 fixed to the second portion 52, bolts 64 screwed from the lower side of the second portion 52, and a thin plate 66 arranged at the upper end of each bolt 64.

Each hole 58 vertically penetrates the second portion 52. Each long hole 60 is a part of the first part 50.
It penetrates a portion below the height position of the second portion 52 and is long in the vertical direction. Each plate 66 is rotatably attached to the tip of the bolt 64. The plate 66 is for preventing the beam member 12 from being damaged by the tip of the bolt 64, and thus may be provided on the beam member 12 or the plate 66 may not be provided.

Each nut 62 corresponds to a hole 58, and is fixed to the lower surface of the second portion 52 by welding or the like so that the axis coincides with the axis of the corresponding hole 58. Therefore, the female screw hole of each nut 62 functions as a through hole that vertically penetrates the second portion 52 together with the hole 58, and also functions as a female screw portion of the through hole. However, instead of providing the nut 62, the hole 58 itself may be a screw hole, or a female screw may be formed in a part of the hole 58.

In the beam receiver 46, mounting bolts 68 are passed through the elongated holes 60, and the bolts 68 are provided in the upper side surface of the column main body 16 at predetermined intervals in the width direction of the beam member 12 in advance. It is attached to the column main body 16 in advance so as to extend in the horizontal direction by being screwed into 70. Each screw hole 70 can be formed by embedding a female screw member such as a screw bush in the column main body 16.

In each beam receiver 46, the receiving member 48 is moved in the vertical direction with respect to the mounting bolt 68 to adjust the tightening position of the mounting bolt 68 with respect to the elongated hole 60, so that the upper surface of the receiving member 48 is mainly a pillar. The height position with respect to the pillar member 10 is adjusted so as to be sufficiently above the upper end of the portion 16.

The column member 10, the beam member 12 and the floor member 14
A method for constructing a reinforced concrete building will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7 (A), first, each pillar member 10 is built in a predetermined portion of the floor 30 and supported by a plurality of beveled diagonal supports 72 so as not to fall. . In this state, the height adjustment and the erection adjustment of the column member 10 are performed.

As shown in FIG. 2, the pillar member 10 has one or more spacers 76 on the floor 30 for maintaining a gap 74 between the pillar member 10 and the floor 30, and each pillar main bar 32 is projected. The part is received in the sleeve joint 22 and built in the floor 30. The spacer 76 may be arranged on the floor 30 in advance with a part thereof embedded in the floor 30.

Next, as shown in FIG. 2, a form 78 for closing the gap 74 between the pillar member 10 and the floor 30 is arranged around the lower end of the pillar main body 16 and is like a high strength cement. Different grout material is injected into the corresponding sleeve joint 22 from at least one passage 24.

The grout material has at least one passage 24.
From the gap 74, the recess 26, the grooves 28, the sleeve joints 22, and the other passages 24. With the injection of the grout material, the air in each sleeve joint 22 is pushed out of the column main body 16 through the corresponding passage 24, and the air in the gap 74 passes through the groove 28, the sleeve joint 22 and the passage 24. The air in the recess 26 is pushed out of the column main body portion 16 and the air in the recess 26 is removed by the gap 74, the groove 28, and the sleeve joint 2.
2 and the passage 24 are pushed out of the column main body 16. Therefore, the grout material is used for each passage 24 and the recess 2
6, each groove 28, each sleeve joint 22, and the gap 74 are filled.

When the grout material is injected to the height position of the passage 24 which is not used as an inlet for the grout material, a part of the grout material flows out from the passage 24 and a predetermined amount of the grout material communicates with the passage 24. It means that it has been injected into the sleeve joint 22. Therefore, the passage 24 that is not used as an inlet for the grout material is closed by the cap 80 when the grout material flows out.

After all the passages 24 not used as grout material inlets are closed by the cap 80, the passages 24 used as grout material inlets are also closed by the same type of cap 80. This makes the grout material
The gap 74, the recess 26, the grooves 28, the sleeve joints 22,
And filled in each passage 24. Pillar member 10 and floor 30
The above state is maintained until the injected grout material is solidified.

The upper and lower column main bars 18, 32 are sleeve joints 2.
The column members 10 are connected by the grout material solidified in
The floor 30 is integrally joined to the floor 30 by solidifying the grout material injected into the gap 74. Pillar member 10 and floor 30
The positional relationship with and is maintained by the grout material solidified in the recess 26.

Next, as shown in FIGS. 7B and 7C, the ends of the beam members 12 are placed on the beam receivers 46 arranged on the upper side surfaces of the adjacent column members 10. As a result, the pair of beam members 12 are arranged on each of the column members 10 in a state where the end faces of the beam main body portions 34 face each other at the beam-column joints on the column main body portions 16.

As shown in FIGS. 5 and 6, each beam receiver 4
6 is a bolt 6 for adjusting the height of the lower surface of the end of the beam main body 34.
4 is received by the plate 66 at the upper end. At this time, each beam member 1
2 is placed on the beam receiver 46 in a state in which the end surface of the beam main body portion 34 is within the cross-sectional area of the column in the column-beam joint, that is, the end surface of the beam main body portion 34 is above the column main body portion 16. To be done. However, each beam member 12 may be placed on the beam receiver 46 in a state where the end surface of the beam main body 34 is aligned with the edge of the column main body 16.

In the above state, each bolt 64 for height adjustment
The height positions of the pair of beam members 12 to be joined are adjusted so that the axis lines of the beam lower end reinforcements 36 facing each other are adjusted by adjusting the screwing amount of the end portions of the beam lower end reinforcements 36 whose axis lines are matched. Are connected in a one-to-one manner by mechanical joints 82 in the beam-column joint.

As described above, if the beam lower end reinforcements 36 to be coupled are aligned with each other in the state where the axes of the beam lower end reinforcements 36 are aligned with each other, the beam lower end reinforcements 36 are connected to each other by a screw grout or a screw. Mechanical joints such as joints and sleeve joints, especially screw joints, can be easily connected. However, instead of using the mechanical joint, the opposite beam lower end reinforcements may be joined by welding.

Next, the bolts 64 for adjusting the height of the beam receiver 46 are unscrewed, so that each beam member 12 is placed on the receiving member 48 at one end of the beam main body 34. In each beam member 12, one end of the beam main body 34 projects into the beam-column joint portion from the beam receiver 46, but there is a difference between the height position of the upper surface of the beam receiver 46 and the height position of the upper surface of the column main body 16. It is separated from the top surface of the pillar main body 16 by a corresponding value. For this reason,
A large space corresponding to the difference between the height position of the upper surface of the beam receiver 46 and the height position of the upper surface of the column main body 16 is formed between the upper surface of the column main body 16 and the lower surface of the beam main body 34.

When the beams intersect in a T-shape at the beam-column joints, the other beam members 12 are connected to each of the column members 10 as described above.
Is located in. In this case, each beam lower end bar of the other beam member,
In order to engage the pair of beam members, the ends of the protrusions from the beam main body are bent upward. In the case where the beams cross each other at the beam-column joints in a cross shape, another pair of beam members 12
Are arranged on each pillar member 10 as described above.

Then, as shown in FIG. 1, each floor member 14
Are hung over at least a pair of beam members 12 extending in parallel. However, in the illustrated example, two floor members 14 are arranged in the area of one span. Therefore, each floor member 14
Are mounted on the edge portions of the beam main body portions 34 of the three beam members 12 mounted on the common column member 10.

As shown in FIG. 7 (C), in parallel with the work of arranging the floor member 14, a plurality of shear reinforcing bars 84 are arranged at the beam-column joints, and a plurality of beam upper end bars 86 of the beam member 12 are arranged. Remaining reinforcing bars for floors or remaining floor main bars and further floor main bars, especially floor main bars orthogonal to the floor main bars 45, are arranged above the floor member 14 so as to pass through the beam-column joints. .

Each upper end streak 86 has a pair of beam members 1 facing each other.
It is arranged in a state in which it extends from one of the two through the beam-column joint to the other, that is, in a through state. Each beam upper end streak 86 may be placed in advance on one of the pair of beam members 12 facing each other. The other main floor reinforcements are arranged in a state of extending over the plurality of floor members 14, that is, in a through state. 1 for each other main floor muscle
It may be placed on one floor member 14 in advance.

Next, as shown in FIG. 8 (A), a predetermined mold is placed. In this case, the upper surface of the pillar main body portion 16 of each pillar member 10, the upper surface of the beam main body portion 34 of each beam member 12, the upper surface of the floor main body portion 42 of each floor member 14, and each beam receiver 46 are part of the formwork. Since it works, the mold 88 may be arranged so as to close the exposed portion of the beam-column joint, and the work of arranging the mold is significantly reduced.

Thereafter, as shown in FIG. 8 (B), concrete is cast on the beam-column joints at the upper portions of the column members 10, on the beam members 12, and on the floor members 14. It Thereby, each pillar member 10, each beam member 12, and each floor member 1
4 is because the cast concrete solidifies,
Directly joined together.

The concrete placed at the beam-column joint is
There is no possibility that a space between the upper surface of the column main body 16 and the lower surface of the beam main body 34 is sufficiently filled to fill the space, and a space is formed between the column main body 16 and the beam main body 34.
As a result, the concrete portion between the upper surface of the column main body 16 and the lower surface of the beam main body 34 can be regarded as an effective portion of the structural column, so that the end portion of the beam main body 34 is connected to the beam-column joint portion. Despite being located in the cross section of the column at, the effective area of the column at the beam-column joint is increased without thickening the column.

The beam receiver 46, the diagonal support 72, and the forms 78 and 88 are removed at any time after the concrete is solidified. The mold 78 can be removed at any time after the grout material has solidified. Each beam receiver 46
Can be removed by removing the mounting bolt 68. At this time, since the mounting bolts 68 are passed through the elongated holes 60 extending in the up-down direction, the fastening by the mounting bolts 68 is released, so that the receiving member 4 is released.
8 moves downward due to its own weight, and the beam receiver 46 causes the beam member 12 to move.
The removal of the beam receiver 46 is facilitated.

Instead of attaching the beam receiver 46 to the pillar member 10 with the bolt 68 and the screw hole 70, the pillar main body 16
It may be attached to the pillar member 10 by a plurality of anchor bolts provided in advance in the upper part of the above and an attachment nut screwed to each anchor bolt. Each anchor bolt is provided on the pillar main body so as to project substantially horizontally from the upper side surface of the pillar main body.

When using anchor bolts and nuts,
The beam receiver 46 is attached to the pillar main body by inserting an anchor bolt provided in the pillar main body into the elongated hole and screwing a nut on each anchor bolt. Also in this case, the beam receiver can be removed by removing the nut. Also, since the anchor bolt is passed through the elongated hole that extends in the vertical direction, by releasing the tightening with the nut, the receiving member moves downward, the beam receiver is separated from the beam member, and the beam receiver can be removed. It will be easier.

The pillar members 10 and the beam members 12 may be made of concrete having the same strength, but the pillar main body 16 is made of concrete having a higher strength than the beam main body 34. Good. In the latter case, the beam main body 3
The end of 4 and particularly at least the portion of the beam-column joint that enters the cross section of the column is made of concrete having substantially the same strength as the concrete of the column main body 16, and concrete having substantially the same strength as the concrete of the column main body 16 is used. It is preferable to drive at least the column-beam joint.

The present invention is not limited to the above embodiment. For example, in the present invention, the cross-sectional shape of the beam member may be semicircular, and the cross-sectional shape of the column member may be circular.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a construction method of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of a pillar member used in the present invention.

FIG. 3 is a perspective view showing an embodiment of a beam member used in the present invention.

FIG. 4 is a perspective view showing an embodiment of a floor member used in the present invention.

FIG. 5 is a diagram showing an embodiment of a beam receiver.

FIG. 6 is a front view of the beam receiver of FIG.

FIG. 7 is a diagram showing steps of the construction method of the present invention.

FIG. 8 is a diagram showing steps subsequent to FIG. 7 in the construction method of the present invention.

[Explanation of symbols]

 10 Column Member 12 Beam Member 14 Floor Member 16 Column Main Part 18 Column Main Bar 20 Hoop Bar 22 Sleeve Joint 24 Air Venting Channel 30 Floor 32 Column Main Bar Stretching from Lower Floor 34 Beam Main Part 36 Beam Lower End Bar 38 Stirrup Bar 42 Floor main part 44 Reinforcing bar for floor 45 Floor main bar 46 Beam receiver 72 Diagonal support 76 Spacer 78,88 Form 82 Mechanical joint 84 Shear reinforcing bar 86 Beam upper end bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoaki Tsujimura 2-1, Tsukudocho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office

Claims (1)

[Claims] 1. A plurality of precast concretes in which upper ends of a plurality of column main bars are projected upward from a column main body and lower ends of the respective column main bars are inserted into a sleeve joint arranged at a lower end of the column main body. The column member of the column is built in the floor joint, and each column main bar of the lower floor projecting upward from the floor is received in the sleeve joint, and the grout material is injected into the sleeve joint of each column member, and a plurality of beams are attached. Each end of a plurality of beam members made of precast concrete in which the lower end bar is projected from each end face of the beam main body and the plurality of stirrup bars are projected upward from the beam main part is placed on the adjacent column member, and I applied a plurality of floor members made of plate-shaped precast concrete with reinforcing bars protruding upward from the floor main part to a plurality of beam members,
Floor member hanging Before, at the same time as, or after me, join the beam lower end reinforcements of the opposite beam members, place multiple shear reinforcements in the beam-column joint, and After placing the floor members, place another floor main bar on the floor member, and then add concrete to the beam-column joint, the beam member and the floor member. A method of constructing a concrete structure, including placing on top.