JP2004270377A - Column-beam preassembled reinforcement body, and preassembled reinforcement method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a column-beam preassembled reinforcement body and a preassembled reinforcement method using the same for performing beam reinforcement assembling work in a low position without forming a pit for column reinforcement insertion and dispensing with timbering for horizontally holding beam reinforcements to support them from the floor of a working story with little flexure caused by the own weight of the beam reinforcements. <P>SOLUTION: This column-beam preassembled reinforcement body A is composed of a lateral pair of vertical column reinforcements 8 comprising a column main reinforcement group 7 of one-story length and hoops 6, and horizontal beam reinforcements 3 comprising a beam main reinforcement group 1 laid between both column reinforcements, and stirrups 2, wherein an upper column reinforcement part 8a, projected upward from the upper end of the beam reinforcement, of the column reinforcement is made longer than a lower column reinforcement part 8b projected downward from the lower end of the beam reinforcement, and a part close to the upper end of the upper column reinforcement part is connected to the upper end of the beam reinforcement by a temporary oblique support 9. The column-beam preassembled reinforcement body A is hung into a building construction position to perform joining between the column main reinforcement group 7 and a preconstructed column main, and between the beam main reinforcement group 1 and a preconstructed beam main reinforcement group. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a post-reinforcing bar reinforced body and a pre-assembled reinforcing bar method using the same.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Publication No. 6-86770 [Patent Document 2]
Japanese Patent No. 3324807
In recent years, with the rise of RC buildings, the cross sections of members such as columns and beams have become large, and the reinforcing bars used for these have large diameters and the amount of reinforcement has also increased. On the other hand, the aging of labor and the shortage of skilled workers are issues in the construction industry. For this reason, in the industrialization method for pre-assembly of columns and beams, for example, in a rebar assembling work area provided near a building construction position, a main bar group having a length of one layer and a hoop wrapped around the outer periphery thereof are fixed. A horizontal beam bar composed of a pair of right and left vertical column bars composed of reinforcing bars, a beam main bar group erected around both column bars in a state penetrating the column bar, and a stirrup bar wound around the outer periphery thereof and fixed. In many cases, a pre-assembled rebar construction method is employed in which a post-reinforced rebar body composed of (1) and (2) is assembled, and this is suspended at a building construction position by a hoist.
[0004]
However, if the pre-assembled rebar construction method is adopted, if rebar assembly work is performed with the column main reinforcement group standing upright in the rebar assembly work area, beam rebar assembly will be performed at a high position, and large scale In addition to the need for a high scaffold, the amount of work at high places is large, so that not only the work efficiency is poor but also there is a problem in safety.
[0005]
With the intention of solving such a problem, the inventions described in Patent Document 1 (Japanese Patent Publication No. 6-86770) and Patent Document 2 (Japanese Patent No. 3324807) have been proposed. According to these conventional examples, there is an advantage that the assembling work of the beam reinforcement can be performed at a low position near the ground, but in the former conventional example, unless a pit for inserting the column reinforcement is formed on the work floor. In the latter conventional example, there is a problem that the beam reinforcement is vertically movable within a certain range with respect to the column reinforcement. ) Is hung at the building construction position (building construction floor), and after joining the column reinforcement, it is necessary to wrap a part of the hoop reinforcement around the column main reinforcement group and fix it. Therefore, there is a problem that it is not possible to immediately proceed to the subsequent process because the rebar arrangement work remains.
[0006]
In particular, in both of the above-mentioned conventional examples, it is necessary to hold the beam reinforcement horizontally at the time of mounting the post-reinforced steel bar suspended on the building construction floor. The beam is supported horizontally from the floor with supports. Therefore, the support for horizontal beam reinforcement hinders the formwork assembling work, which not only reduces the workability of the formwork construction, but also reduces the workability of the formwork. Since the load of the beam reinforcement is applied to the slab concrete of the age, vibration may occur due to support installation work or the like, and there is a problem that it is not preferable in terms of concrete strength.
[0007]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described problems, and has as its object the ability to perform beam bar assembly work at a low position without forming a pit for inserting a column bar. In addition, the amount of deflection due to the weight of the beam rebar is small, and it is not necessary to support the beam rebar supporting the beam rebar from the floor of the work floor. To provide a construction method.
[0008]
[Means for Solving the Problems]
The technical measures taken by the present invention to solve the above-mentioned problems are as follows. That is, a pair of right and left vertical column bars composed of a column main bar group having a length of one layer and a hoop bar wrapped around the outer periphery thereof, It is composed of a horizontal beam consisting of a main beam group laid on the both pillars in a state penetrating both pillars and a stirrup wound around the outer periphery thereof, and is formed in a laterally K-shape. The upper column that protrudes upward from the upper end is longer than the lower column that protrudes downward from the lower end of the beam, and the vicinity of the upper end of the upper column and the upper end of the beam are connected with a temporary diagonal support. It is characterized by doing.
[0009]
According to the second aspect of the present invention, there is provided a column-reinforced steel bar body including one vertical column bar composed of a column main bar group having a length of one layer and a hoop bar wound and fixed around the outer periphery thereof. It is formed in a cross shape by a horizontal beam bar consisting of a beam main bar group erected on the column bar while penetrating the bar and a stirrup bar wrapped around the outer periphery, and upward from the beam bar upper end of the column bar. The protruding upper column is longer than the lower column that protrudes downward from the lower end of the beam, and the upper column near the upper end and the upper end of the beam are connected by a temporary diagonal support. And
According to a third aspect of the present invention, there is provided a pre-assembled rebar according to the first or second aspect, which comprises assembling the post-reinforcement body at a location other than the building construction position. The method is characterized in that it is suspended at a building construction position, and the column main bar group and the previously constructed column main bar group are joined, and the beam main bar group and the beam main bar group previously constructed are joined.
[0011]
According to the above configuration, since the required amount of hoop reinforcement is wound and fixed on the outer periphery of the column main reinforcement group, it is an almost complete column-beam pre-assembled rebar body. If there is no work and the beam-to-column reinforced body is joined, the work in the post-process can be started immediately, and yet, of the column bars set to the length of one layer, project upward from the top of the beam bars The upper column reinforcement that is made longer than the lower column reinforcement that protrudes downward from the lower end of the beam reinforcement, in other words, is equivalent to the floor height, in contrast to a general column-reinforced reinforced body. Since the lower column that projects downward from the lower end of the beam bar of the length is shorter than the upper column that protrudes upward from the upper end of the beam bar, a pit is formed on the ground for inserting column beams. Without doing this, the beam reinforcing work can be performed at a low position.
[0012]
In particular, since the upper column portion of the column reinforcement projecting upward from the upper end of the beam reinforcement is long, the angle of the oblique support connecting the vicinity of the upper end of the upper column reinforcement and the upper end of the beam reinforcement can be sufficiently set. Therefore, the amount of deflection of the beam reinforcement due to its own weight can be reduced. That is, if the height of the upper column reinforcement portion protruding from the upper end of the beam reinforcement is low, even if the vicinity of the upper end of the upper column reinforcement portion and the upper end of the beam reinforcement are connected by the diagonal support, the diagonal support has a nearly horizontal inclination angle. However, if the lower end of the diagonal support is connected to the lower end of the beam streak in order to stabilize the diagonal support, the beam main stirrups and stirrup streaks become obstructive, The connection work and the removal work of the diagonal support to the lower end are troublesome, and when the diagonal support is removed after the formwork construction, the side formwork of the beam becomes an obstacle, so that it is further troublesome.
[0013]
In this regard, according to the above configuration, the projecting height of the upper column reinforcement portion from the upper end of the beam reinforcement is high, so that even when the lower end of the diagonal support is connected to the upper end of the beam reinforcement, the angle of the diagonal support can be steep. Therefore, there is an advantage that the support function of the beam by the diagonal support is sufficiently exhibited, and the operation of connecting and detaching the diagonal support to and from the beam reinforcement can be easily performed.
[0014]
In addition, since the support function of the beam by the diagonal support is sufficiently exerted, the amount of bending of the beam reinforcement by its own weight is reduced. Therefore, there is no need to provide a support for horizontally maintaining the beam reinforcement supporting the beam reinforcement from the floor of the working floor, and there is no possibility that the strength development of the slab concrete of the young age is adversely affected.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The column-beam pre-assembled rebar body A and the pre-assembled rebar construction method using the same according to the present invention will be described with reference to an exemplary diagram. As shown in FIG. 1A, a rebar provided near a building construction position is shown. In the assembling work area, first, a beam main reinforcing bar group 1 having a length of two spans (in the illustrated example, a beam main reinforcing bar having a length of one span is added to form two spans) and wound around the outer periphery thereof and fixed. A horizontal beam bar 3 composed of the stirrup bar 2 is assembled. This work is performed by installing a short base 5 on the work floor 4, supporting the upper main bar of the beam on the mount 5, and supporting the lower main bar via the stirrup bar 2 on the upper main bar. It is performed at a low position without forming a pit for inserting a column. Hoop bars 6 are installed directly below the beam bars 3 corresponding to the column bar assembly positions.
[0016]
Thereafter, as shown in FIG. 1 (B), a pair of left and right hoop bars 6 composed of a column main bar group 7 having a length of one layer positioned above the column bar assembly position and a hoop bar 6 wound around the outer periphery thereof are fixed. While assembling the vertical column bars 8, the column columns 8 and the beam columns 3 supported by the gantry 5 are connected to each other, for example, by binding them with a line, and the beam columns 3 are connected to the left and right column columns 8. It is installed so as to penetrate the streaks 8. Since the beam sources 3 are bridged lower position, as shown in FIG. 1 (B), the length L ₁ of the upper Hashirasuji portion 8a projecting from the beam sources 3 the upper end of the pillar muscle 8 upward, the beam It is longer than the length L ₂ of the lower pillar muscle portion 8b protruding from the muscle 3 bottom downward.
[0017]
The length L ₁ of the upper Hashirasuji portion 8a can be arbitrarily set within a range in which the height of the joint portion of the pillar muscle 8 is 1/2 or more posts in dimensions, (Distance beam upper and the beam bottom) . In the illustrated example, the length _{L 1} is 1500mm about upper Hashirasuji portion 8a, the length _{L 2} of about 560mm of the lower pillar muscle portion 8b, the vertical width _{L 3} of the beam sources 3 is set to about 900mm . The beam work floor 4 is leveled with abandoned concrete so that the main bar group 7 can be positioned. Although not shown, the work floor 4 is provided with a plywood template having a positioning hole for inserting the lower end of the column main bar, and positioning the column main bar group 7 is efficient in column bar assembly work. It is desirable from the viewpoint of realizing.
[0018]
Thereafter, as shown in FIG. 1 (C), the vicinity of the upper end of the upper column bar portion 8a and the upper end of the beam bar 3 are connected by a temporary diagonal support 9 to form a laterally K-shaped beam-to-column reinforced body. Complete A. As the oblique support 9, one with a turnbuckle 9a is used. The lower end of the oblique support 9 may be connected to either the upper main bar of the beam or the stirrup bar 2. Further, it is desirable that the upper end of the beam reinforcement by the oblique support 9 (the connection between the oblique support 9 and the upper end of the beam reinforcement 3) be performed at a position that is approximately １ ／ of the inside dimension of the beam. The upper end of the oblique support 9 may be connected to any of the column main bar and the hoop bar. In any case, as shown in the drawing, by installing the oblique supports 9 on both sides of the column bar 8, there is an advantage that the hoop bar of the main body becomes a tension member, and a temporary member for tension reinforcement is not required. .
[0019]
Next, as shown in FIGS. 1 (D) to 2 (A), (B), and (C), the beam-to-column reinforced body A is suspended at a building construction position by a hoist (not shown). Put in. As shown in FIGS. 1 (D) and 2 (B), the lifting by the hoist is performed by suspending and supporting the traverser 10 with a plurality of hanging ropes 11. In the case where the vicinity of the upper end of the upper column reinforcement 8a and the traverser 10 are connected by the fall prevention rope 11a, as shown in FIG. A main rope 12 for locking the lifeline is stretched between the upper columnar portions of the left and right columnar bars 8, and when the traverser 10 is separated, the worker on the beam 3 secures the safety with the lifeline. The fall prevention rope 11a can be detached from the upper column bar portion 8a while securing. In addition, the ropes 13 are attached to both ends of the beam reinforcement 3, respectively, and as shown in FIG. Is desirable.
[0020]
Thereafter, as shown in FIG. 2C, the column main bar group 7 of the post-reinforced steel bar A is joined to the column main bar group 7 constructed in advance and the beam main bar group 1 is preceded. Joining with the installed main beam group 1 is performed. As the joining means, a screw-type coupler, a grout-type coupler, or the like, which can be joined without moving the column main beam or the beam main bar in the axial direction or rotating around the axis, is used.
[0021]
In addition, when an unnecessary beam load is applied to the bottom formwork of the beam at the time of formwork construction, it is difficult to perform the formwork work. Therefore, the oblique support 9 is arranged such that the beam reinforcement 3 is located slightly above the designed beam level. It is better to be nervous. Then, the diagonal support 9 may be removed by the time of checking the construction level of the bottom formwork of the beam, which is performed before placing concrete.
[0022]
According to the above configuration, since the required amount of the hoop reinforcing member 6 is wound around the outer periphery of the column main reinforcing bar group 7 and is almost complete, the column-beam pre-assembled rebar body A is provided. There is no work to wind and fix the joints, and after joining the column-beam-to-tip assembled reinforced body A, the work in the subsequent process can be started immediately.
[0023]
However, of the column bars 8 having a length corresponding to one layer, the upper column bars 8a projecting upward from the upper ends of the beam bars 3 are separated from the lower column bars 8b projecting downward from the lower ends of the beam bars 3. The length of the lower pillars 8b is shortened, and the assembling work of the beam 3 can be performed at a low position without forming pits for inserting pillars on the ground.
[0024]
Particularly, since the upper column bar portion 8a of the column bar 8 projecting upward from the upper end of the beam bar 3 is long, the angle of the oblique support 9 connecting the vicinity of the upper end of the upper column bar portion 8a and the upper end of the beam bar 3 is large. And the amount of deflection due to the own weight of the beam reinforcement can be reduced, so that there is no need for a support for horizontal maintenance of the beam reinforcement supporting the beam reinforcement 3 from the floor of the work floor, and There is no risk of exerting an adverse effect on the strength development of the slab concrete, and the lower end of the slant support 9 is connected to the upper end of the beam reinforcement 3, so that the connection work and the removal work of the slant support 9 with respect to the beam reinforcement 3 can be easily performed.
[0025]
FIG. 3 schematically illustrates a beam-to-column reinforced body A according to the present invention. That is, FIG. 3A shows a laterally K-shaped column-beam-tip reinforced body A composed of a two-span beam reinforcing bar 3 and two column bars 8, as described with reference to FIGS. This is schematically shown, where 9 indicates an oblique support, and a circle a indicates a joint portion.
[0026]
FIG. 3B shows a cross-shaped beam-to-column reinforced body A composed of one-span beam reinforcement 3 and one column reinforcement 8, that is, a column main reinforcement group having a length of one layer. A vertical column bar 8 composed of a hoop bar wound and fixed on the outer periphery thereof, a beam main bar group laid on the column bar 8 in a state penetrating the column bar 8, and a star wound and fixed on the outer periphery thereof An upper column bar portion, which is formed in a cross shape with a horizontal beam bar 3 composed of a lap bar and protrudes upward from the upper end of the beam bar 3 of the column bar 8, and a lower column bar bar projecting downward from the lower end of the beam bar. FIG. 2 schematically shows a post-reinforced steel bar body A in which a portion near the upper end of an upper column reinforcement portion and an upper end of a beam reinforcement are connected by a temporary oblique support 9.
[0027]
FIG. 3 (C) schematically shows a T-shaped beam-to-column reinforced body A employed on the wife side of the house. These three types of beam-to-column reinforced bodies A are used in combination when allocating the beam-to-column reinforced bodies A in accordance with the number of columns of a property during construction.
[0028]
【The invention's effect】
Since the present invention has the above-described configuration, the work of assembling the beam rebar can be performed at a low position without forming a pit for inserting the column rebar, and the bending amount due to the weight of the beam rebar is small, and There is an effect that there is no need to provide a support for horizontal maintenance of the beam reinforcement supporting the beam reinforcement from the floor.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic side view illustrating a post-reinforcing bar reinforced body according to the present invention and a pre-assembled reinforcing bar method using the same.
FIG. 2 is a schematic side view illustrating a post-reinforcing bar body according to the present invention and a pre-reinforcing bar construction method using the same.
FIG. 3 is a view schematically illustrating a post-column beam reinforcing steel body according to the present invention.
[Explanation of symbols]
A: Reinforced beam-column assembly, 3: Beam reinforcement, 8: Column reinforcement, 8a: Upper column reinforcement, 8b: Lower column reinforcement, 9: Diagonal support.

Claims (3)

A pair of right and left vertical column bars consisting of a column bar bar having a length of one layer and a hoop bar wound around the outer periphery thereof, and a beam bar bar erected on both column bars in a state penetrating both column bars. And a horizontal beam bar composed of a stirrup bar wound around and fixed to the outer periphery of the column bar. A beam-column reinforcer body characterized in that it is longer than a protruding lower column bar portion, and a portion near an upper end of an upper column bar portion and a beam bar upper end are connected by a temporary diagonal support. A vertical column bar composed of a column bar bar having a length of one layer and a hoop bar wound around the outer periphery thereof, and a beam bar bar erected on the column bar so as to penetrate the column bar. An upper column reinforcement portion, which is formed in a cross shape with a horizontal beam reinforcement composed of a stirrup reinforcement wound around the outer periphery thereof and projecting upward from an upper end of the beam reinforcement of the column reinforcement, projects downward from a lower end of the beam reinforcement. A beam-column pre-assembled reinforced body characterized in that it is longer than a lower column reinforcement, and a portion near an upper end of an upper column reinforcement and an upper end of a beam reinforcement are connected by a temporary diagonal support. At a place other than the building construction position, the column-reinforced reinforced body according to claim 1 or 2 is assembled, the column-reinforced reinforced body is hung at the building construction position, and is constructed prior to the column main reinforcement group. A pre-assembled rebar construction method, comprising: joining with a column main bar group and connecting the beam main bar group with a beam main bar group previously constructed.

Images