JP6554456B2 - RC beam shear unit and construction method of RC beam - Google Patents

Description

  The present invention relates to an RC beam shear bar unit and an RC beam construction method, and more particularly, to an RC beam shear bar unit and an RC beam beam construction method that save labor in assembling and assembling reinforcing bars at a construction site.

  When constructing a reinforced concrete building, the foundation beam is first constructed to strengthen the foundation. The foundation beam construction is performed by arranging the main bars and the stair wrap bars, constructing a formwork, and pouring concrete into the formwork.

The foundation beam usually has a height of 2500 mm to 5000 mm, and when it is processed using a reinforcing bar having a length of one side of the foundation beam, the weight becomes large, and the reinforcement arrangement becomes difficult. Therefore, in many cases, the stirrup of the foundation beam is prepared by preparing a plurality of divided reinforcing bars and joining them together using a lap joint or the like.
In addition, when all this processing is performed at the construction site, it takes time to assemble the main reinforcement and the stirrup. Therefore, it will be necessary to arrange many reinforcing bars.

  Japanese Patent Laid-Open No. 2004-133830 proposes beam reinforcement by using a stirrup reinforcement whose main unit is previously unitized by a plurality of connecting reinforcements.

  Further, in Patent Document 2, as a reinforcing bar rod and its assembling technique, it is proposed to use a reinforcing bar rod having a plurality of fixing bars for mutually fixing a slap group in which U-shaped scallops are arranged at predetermined intervals. ing.

  Further, Patent Document 3 proposes to use a U-shaped housing in which a plurality of U-shaped scallops arranged in a substantially balanced manner are fixed with temporary fixing bars as a technique for assembling a beam-part concrete rebar net.

Unexamined-Japanese-Patent No. 3-66688 JP-A-8-209858 Unexamined-Japanese-Patent No. 11-159143

  As mentioned above, there were attempts to improve the work efficiency of the beam reinforcement, but there is a technology that can easily and accurately perform RC beam construction, shorten the construction period, and reduce the labor and cost of construction. Still desired.

The object of the present invention is to simplify the processing and assembly of RC beams such as foundation beams and beams on a general floor in a construction site, and to easily and accurately construct RC beams, and to be efficient with a minimum of labor personnel It is to provide an RC beam shear unit to be assembled.
Another object of the present invention is to provide a method of constructing an RC beam using the RC beam shear unit.

According to the RC beam shear unit of the present invention, the subject includes a first side, a second side, and a bottom between the first side and the second side. A first unit including a plurality of U-shaped scallops, and arranged and connected at predetermined intervals so that the U-shaped adjacent scallops overlap in the arrangement direction; a first side; and a second side And a plurality of U-shaped scallops having a bottom part between the first side part and the second side part, and the U-shaped adjacent scallops are aligned at predetermined intervals so as to overlap in the arrangement direction. An RC beam shear unit including a second unit arranged and connected together, wherein the first unit is connected by a side step along a first side of each of a plurality of the staples; The bottom of each of a plurality of said staples is connected by a bottom step and The second unit is configured such that a second side portion of each of the plurality of scallops is connected by a side setup line, and a bottom portion of each of the plurality of scallops is connected by a bottom setup line, and the first unit and the second unit one of said bottom setup muscles unit is attached to the outside of the bottom portion, the other of said bottom setup muscles of the first unit and the second unit is attached to the inside of the bottom portion, the first The first side of the staple in one unit and the first side of the staple in the second unit are adjacent to each other, and the second side of the staple in the first unit, and the second The second side of the staple in the unit is adjacent to each other, and the bottom of the staple in the first unit and the second unit are The fact that the bottom of Sturup are combined so as to be adjacent to each other that is solved by.

Thus, the construction of the RC beam at the construction site can be performed quickly and easily by using a semi-finished unit in which a plurality of stirrups are connected by the side set-up bars and the bottom set-up bars.
Moreover, since two types of units having different positions for attaching the bottom setup line are prepared, it is possible to set the vertical positions of a plurality of stirrups to normal positions when the units are combined. .
In addition, since each of the two types of units can overlap a plurality of units and can save space, it can be loaded in a centralized manner and can be collected at the factory and construction site sites, thereby saving transportation costs.

At this time, in the first unit, the side setup bar is attached to the outside of the first side part, and in the second unit, the side setup bar is attached to the inside of the second side part. It is preferable to configure as follows.
In the first unit, the side set-up bars are attached to the outside of the first side part, and in the second unit, the side set-up bars are attached to the outside of the second side part. You may comprise.
As described above, since the positions for attaching the side set-up bars are different between the two types of units, when the units are combined, the horizontal position of the plurality of stirrups must be set to a normal position. Is possible.

At this time, the bottom setup line of the first unit is attached to a position near the second side part in the bottom part of the first unit, and the bottom setup line of the second unit is It is preferable to be configured to be attached at a position near the first side at the bottom of the unit.
With this configuration, the side step formations and the bottom step formations are in a positional relationship that can appropriately stabilize a plurality of staples in each unit, so that they are easy to handle during transportation of each unit and construction work of RC beams. It will be a thing.

At this time, in the first unit and the second unit, it is preferable that a distance between a plurality of adjacent ones of the staples be 20 cm or more and 40 cm or less.
In this way, when the spacing between adjacent staples is configured to be twice (20 cm to 40 cm) as the design-specified shear bar pitch (about 10 cm to 20 cm), each unit is combined Since the RC beam shear bar unit has an interval twice as large as the pitch between the slaps, a unit having a long overall length can be handled.

Moreover, according to the construction method of the foundation beam using the RC beam shear bar unit of this invention, the said subject is the 1st side part, the 2nd side part, said 1st side part, and 2nd side part. A plurality of U-shaped staples having bottoms between the side portions, the U-shapes of adjacent ones of the staples are arranged at predetermined intervals so as to overlap in the arrangement direction, and the first side of the plurality A first unit providing step of preparing a first unit in which the parts are connected to each other by side step reinforcements and the bottoms of the plurality of staples are connected to each other by bottom step reinforcements; first side and second side And a plurality of U-shaped scallops having a bottom part between the first side part and the second side part, and the U-shaped adjacent scallops are aligned at predetermined intervals so as to overlap in the arrangement direction. Arranged so that the second sides of the plurality of said staples A second unit preparing step of preparing a second unit connected by a screed and the bottoms of a plurality of the stallaps connected with each other at the bottom step, a first side of the stallapp of the first unit, and the first side The first side of the scallop in the second unit is adjacent to each other, and the second side of the scallop in the first unit is adjacent to the second side of the scallop in the second unit. A combination step of combining the first unit and the second unit so that the bottom of the scallop in the first unit and the bottom of the sturp in the second unit are adjacent to each other, and the combined first unit and And a bundling step of bundling the second unit.
As described above, when constructing RC beams, two types of units in the form of semifinished products are prepared in advance and combined, and the weight per unit is set to 20 kg to 30 kg. Machining and assembly can be done quickly and easily with one rebar worker. Therefore, the construction period can be shortened, and the labor, labor and cost of construction can be reduced.

At this time, in the combination step, it is preferable that the first side portion of the scallop of the second unit is brought into contact with the side setup line of the first unit from the inside.
In this way, since two types of units with different positions for attaching the side set-up bars are prepared and combined, it is possible to set the horizontal position of multiple scallops to the normal position when combining each unit. It becomes.

At this time, in the combining step, the bottom portion of the stapler of the second unit abuts from the inside to the bottom step formation of the first unit, and the bottom portion of the second unit is at the bottom portion of the first unit It is preferable to combine the setup bars so as to abut from the inside.
As described above, since two types of units having different positions for attaching the bottom set-up bars are prepared and combined, it is possible to set the vertical position of a plurality of staples to a normal position when combining the units. Become.

At this time, it is preferable that the first unit preparing step and the second unit preparing step include a step of welding the side set-up bars and the bottom set-up bars to a plurality of the stirrups by simple welding.
As described above, when the simple welding under the low current and low voltage welding conditions is performed, the welding of the set-up bars can be performed without giving the influence of heat to the staple wrap and without losing the yield strength.

ADVANTAGE OF THE INVENTION According to this invention, construction of RC beams, such as a foundation beam and a general floor beam, can be performed rapidly and easily, a construction period can be shortened, and it becomes possible to hold down the effort and expense of construction.
In addition, the present invention makes it possible to efficiently process and construct rebars at a construction site and to construct RC beams smoothly, so it is possible to efficiently construct RC beams with a minimum of labor personnel. .

  In addition, since the RC beam is unitized into a partially assembled semi-finished product form, it is possible to make a stacked cargo form and save a space for transportation.

It is a perspective view which shows the 1st unit of RC beam shear unit based on this invention. It is an end elevation showing the 1st unit of RC beam shear unit based on the present invention. It is a perspective view which shows the 2nd unit of RC beam shear unit based on this invention. It is an end elevation showing the 2nd unit of RC beam shear unit based on the present invention. FIG. 2 is a perspective view of a combined RC beam shear unit according to the invention; FIG. 2 is an end view of a combined RC beam shear unit according to the invention; It is a perspective view which shows the state which integrated the 1st unit and 2nd unit of the RC beam shear bar unit which concerns on this invention. It is a perspective view which shows the state in the middle of making the 2nd 1st unit put together after making the 1st unit and the 2nd unit of the RC beam shear bar unit concerning the present invention put together. It is a flow figure showing the construction method of the RC beam using the RC beam shear bar unit concerning the present invention.

Hereinafter, an embodiment of the present invention will be described based on the drawings. The members, arrangements, and the like described below do not limit the present invention, and various modifications can be made within the scope of the present invention.
1 to 8 show an embodiment of the present invention, FIG. 1 is a perspective view showing a first unit of an RC beam shear bar unit, and FIG. 2 shows a first unit of an RC beam shear bar unit. 3 is a perspective view showing a second unit of the RC beam shear unit, FIG. 4 is an end view showing a second unit of the RC beam shear unit, and FIG. 5 is a combined RC beam shear unit 6 is a perspective view showing the unit, FIG. 6 is an end view showing a combined RC beam shear unit, and FIG. 7 is a perspective view showing a state in which the first unit and the second unit of the RC beam shear unit are integrated. FIG. 8 is a perspective view showing a state in the middle of the second first unit after the first unit and the second unit of the RC beam shearing unit according to the present invention are consolidated, and FIG. 9 is the RC beam. Using the shear muscle unit It is a flow diagram illustrating a method of constructing the RC Zohari.

(Definition)
In the present embodiment, the region side surrounded by the U character is the inside, and the side opposite to the region side surrounded by the U character is the outside.
In the present embodiment, the inner side of the scallop is the region side surrounded by the U-shape at the side portion of the scallop, and is the upper side of the bottom of the U-shape at the bottom portion of the slap.
In the present embodiment, the outer side of the staple is the side opposite to the side surrounded by the U at the side of the staple and is the lower side of the bottom of the U at the bottom of the staple.

<RC beam shear unit>
RC beam shear unit K according to the present embodiment is a unit for constructing RC beam shear bars for constructing a foundation beam serving as a foundation of a reinforced concrete structure and a beam of a general floor, A plurality of first units A and second units B are combined, and a main reinforcement is arranged on them to form an RC beam.

(First unit)
As shown in FIG. 1, the first unit A includes a plurality of stirrups 10 in which reinforcing bars are bent into a U-shape, the U-shapes of the adjacent stirrups 10 face the same direction, and the U-shape is the arrangement direction H. It is a unit of the shape arrange | positioned and arrange | positioned by predetermined spacing so that it may overlap by _A. FIG.
Note that the arrangement direction _HA means a direction in which a plurality of staples 10 are aligned and arranged.
The scallop 10 of the first unit A has a first side portion 10a, a second side portion 10b, a bottom portion 10c between the first side portion 10a and the second side portion 10b, and both end portions are mutually connected. And an inwardly bent hooked end 10d. The first side 10a and the bottom 10c are continuous at the first corner 10e, and the second side 10b and the bottom 10c are continuous at the second corner 10f.

First side 10a of the plurality of Sturup 10 which is disposed aligned with the arrangement direction H _A is connected at the side setup muscles 12 to each other, the bottom 10c of the plurality of Sturup 10 is connected at the bottom setup muscles 14 to each other ing.
Here, as shown in FIGS. 1 and 2, the side set-up bars 12 are attached to the outside of the first side part 10 a of the plurality of scallops 10, and the bottom set-up bars 14 are formed of a plurality of scallops. 10 is attached to the outer side (lower side in FIG. 1) of the bottom part 10c.

  Further, the bottom setup bar 14 of the first unit A is attached to a position near the second side 10b in the bottom 10c, that is, a position closer to the second side 10b than a center position in the longitudinal direction of the bottom 10c. ing. If comprised in this way, the 1st side part 10a and the bottom part 10c of the U-shaped scallop 10 will continue at a substantially right angle in the 1st corner | angular part 10e, and the side part setup line 12 and the bottom part setup line 14 may be connected. The first corner 10e is attached to a position far from each other, and at this position, the first side corresponding to two sides of the U-shaped stirrup 10 is formed by the side set-up bars 12 and the bottom set-up bars 14. By supporting the part 10a and the bottom part 10c, it is possible to stably support the scallop 10 in an upright (standing) state. Therefore, since it becomes the positional relationship which can stabilize suitably the several stagger 10 in the 1st unit A, it becomes easy to handle at the time of conveyance of the 1st unit A, and construction work of RC girder.

(Second unit)
As shown in FIG. 3, the second unit B includes a plurality of scallops 20 in which reinforcing bars are bent into a U shape, the U shape of each adjacent slap 20 is directed in the same direction, and the U shape is an arrangement direction H. It is a unit of the shape arrange | positioned and arranged by predetermined spacing so that it may overlap by _B. FIG.
The slap 20 of the second unit B has a first side part 20a, a second side part 20b, and a bottom part 20c between the first side part 20a and the second side part 20b. It has a hooked end 20d which is bent inwardly to each other. The first side 20a and the bottom 20c are continuous at the first corner 20e, and the second side 20b and the bottom 20c are continuous at the second corner 20f.
Note that the arrangement direction H _B, refers to the direction in which disposed are aligned multiple Sturup 20.

Second side 20b of the arrangement direction H plurality of Sturup 20 which is disposed aligned with the _B is connected at the side setup muscles 22 to each other, the bottom 20c of the plurality of Sturup 20 is connected at the bottom setup muscles 24 to each other ing.
Here, as shown in FIGS. 3 and 4, the side step reinforcements 22 are attached to the inside of the second side 20 b of the plurality of staples 20, and the bottom step formations 24 have a plurality of stair wraps. 20 is attached to the inside (upper side in FIG. 3) of the bottom 20c.

  Further, the bottom setup line 24 of the second unit B is attached at a position near the first side 20a in the bottom 20c, that is, at a position closer to the first side 20a than a center position in the longitudinal direction of the bottom 20c. ing. With this configuration, as in the case of the first unit A, the side step forming streaks 22 and the bottom step forming streaks 24 have a positional relationship that can appropriately stabilize the plurality of staples 20 in the second unit B. It becomes easy to handle at the time of transportation of B and construction work of RC beam.

(Combination of first unit A and second unit B)
The first unit A and the second unit B of the RC beam shear bar unit K according to the present embodiment are manufactured as a semi-finished product by welding a stirrup and a setup bar at a factory or the like and transported to a construction site. The first unit A and the second unit B are combined at the construction site.
As shown in FIG. 5, the ends in the arrangement direction H _B and Sturup 10 positioned at the end portion in the arrangement direction H _A of the first unit A (Sturup 10 located nearest side in FIG. 5) the second unit B Are combined with each other so as to be disposed adjacent to each other.
Specifically, the first side portion 10a of the scallop 10 in the first unit A and the first side portion 20a of the scallop 20 in the second unit B are alternately adjacent to each other, and The second side portion 10b and the second side portion 20b of the scallop 20 in the second unit B are alternately adjacent to each other, the bottom portion 10c of the scallop 10 in the first unit A, and the bottom portion of the slap 20 in the second unit B. 20c are combined to be alternately adjacent.

The RC beam shearing unit K obtained by combining the first unit A and the second unit B includes a plurality of staplings 10 and 20 obtained by bending a reinforcing bar into a U shape, and the adjacent staplings 10 and 20 alternately adjacent to each other. U-faces in the same direction, and is a unit having a shape arranged to be aligned at predetermined intervals as U-shaped overlap in the arrangement direction H _K.
Note that the arrangement direction H _K, refers to the direction in which disposed are aligned multiple Sturup 10, 20 alternately.

At this time, as shown in FIGS. 5 and 6, the side set-up bars 12 of the first unit A are connected to the first side 10 a of the scallop 10 in the first unit A and the first slap 20 in the second unit B. The side set-up bar 22 of the second unit B is disposed outside the side portion 20a of the second unit B, and the second side portion 10b of the scallop 10 in the first unit A and the second side portion 20b of the scallop 20 in the second unit B. Since they are arranged inside the side portion 20b, the horizontal positions of the plurality of scallops 10 of the first unit A and the plurality of scallops 20 of the second unit B are set to normal positions.
In addition, as shown in FIGS. 5 and 6, the bottom stepped stripe 14 of the first unit A is disposed outside the bottom 10 c of the stair wrap 10 in the first unit A and the bottom 20 c of the stale wrap 20 in the second unit B. At the same time, since the bottom setup line 24 of the second unit B is disposed inside the bottom 10c of the scallop 10 in the first unit A and the bottom 20c of the scallop 20 in the second unit B, a plurality of scallops of the first unit A are provided. The vertical positions of the plurality of scallops 20 of the second unit B and the second unit B are set to normal positions.
As described above, the side set-up bars 12 and the bottom set-up bars 14 of the first unit A are attached to the outside of the scallop 10, and the side set-up bars 22 and the bottom set-up bars 24 of the second unit B are connected to the inside of the slap 20. The first unit A and the second unit B can be accurately aligned.

In the RC beam shear bar unit K according to the present embodiment, the pitch p1 that is the interval between the slaps 10 in the first unit A shown in FIG. 1 and the interval between the slaps 20 in the second unit B shown in FIG. Each slap is arranged so that the pitch p2 is equal to twice the pitch p3 which is the interval between the slaps in the RC beam shear bar K after the combination shown in FIG.
Specifically, the pitches p1 and p2 in the first unit A and the second unit B before combination may be 20 cm or more and 40 cm or less. Therefore, the pitch p3 in the RC beam shearing unit K after being combined is 10 cm or more and 20 cm or less.

  In addition, the weight of the first unit A and the second unit B is about 30 to 40 kg, which allows the work on the construction site to be performed manually, so the total length of the first unit A and the second unit B is It will be around 1m. Depending on the construction site, there is a case where a tow truck can be used together. At this time, the RC beam shear bar unit K processed into the RC beam length which is the required span length of the design is transported.

(Packing style of first unit A and second unit B)
FIG. 7 shows a state in which the first unit A and the second unit B are integrated and the package is combined when being transported.
When the first unit A and the second unit B are aggregated, the second unit B rotated 180 ° from the state of FIG. 3 is combined with the first unit A of the state of FIG.
As shown in FIG. 7, with respect to the first side portion 10a of Sturup 10 disposed at an end in the arrangement direction H _A of the first unit A (Sturup 10 located nearest side in FIG. 1), the second It combined so that the second side 20b of Sturup 20 disposed at an end in the arrangement direction H _B of the unit B (Sturup 20 located farthest side in FIG. 3) are arranged adjacent to each other.

  Specifically, the first side portion 10a of the scallop 10 in the first unit A and the second side portion 20b of the scallop 20 in the second unit B are alternately adjacent to each other, and The second side portion 10b and the first side portion 20a of the scallop 20 in the second unit B are alternately adjacent to each other, the bottom portion 10c of the scallop 10 in the first unit A, and the bottom portion of the slap 20 in the second unit B. 20c are combined to be alternately adjacent.

  At this time, as shown by a two-dot chain line in FIG. 7, by arranging (temporarily, binding) the setup line 30 on the outer side (lower side in FIG. 7) of the bottom parts 10 c and 20 c of the scallops 10 and 20, The presence of 14 prevents the bottoms 10c and 20c of the staples 10 and 20 from tilting.

Next, as shown by a two-dot chain line in FIG. 8, a second set-up bar 30 is disposed inside the bottom portion 10 c of the scallop 10 and the inside 20 c of the slap 20 (upper side in FIG. 8).
And the 2nd unit B already arranged and the 2nd first unit A shown with a dashed-two dotted line are combined so that it may be arranged adjacent to each other.
At this time, due to the arrangement of the second setup wire 30, the bottom 10c of the staple 10 of the second first unit A is inclined due to the presence of the bottom setup wire 24 of the second unit B already arranged. Can be prevented.

  In this way, by combining the plurality of first units A and the plurality of second units B alternately and collectively, the packing form can be combined, so that the unit is formed by stapling and setup lines of each unit. Since the space occupied by the second unit is occupied by another unit, it is possible to increase the load on the transport means such as a truck rather than when the first unit A and the second unit B are in the finished product state.

As described above, the RC beam shear rebar unit K according to the present embodiment is a position where the side step setting bars 12 and 22 and the bottom step setting bars 14 and 24 are attached to the U-shaped stalaps 10 and 20. Because it includes the first unit A and the second unit B in the form of semi-finished products, a plurality of first units A and a plurality of second units B can be aggregated during transportation so that the packaging can be combined. , And an advantage that it is possible to increase the loading capacity on the transportation means such as a truck.
In addition, since the RC beam shear bar unit K according to the present embodiment can be bundled together as a set, it is easy to organize at the construction site.

(Modified example of RC beam shear unit)
Although FIG. 1 and FIG. 2 illustrated the thing in which one side setup line 12 was attached to the 1st side 10a of the 1st unit A, the number of side setup lines 12 is limited to one. Depending on the length of the side member, it may be two or three or more.
Moreover, although the thing in which one side setup line 22 was attached to the 2nd side 20b of the 2nd unit B was illustrated in FIG.3 and FIG.4, the number of side setup lines 22 is one. The length of the side member may be two or three or more, depending on the length of the side member.
Furthermore, the number of the side setup bars 12 in the first unit A and the number of the side setup bars 22 in the second unit B may be different from each other.

Similarly, FIG. 1 and FIG. 2 exemplify a case where one bottom setup line 14 is attached to the bottom 10c of the first unit A. However, depending on the beam width, the number of bottom setup bars 14 may be one. It is not limited and may be two or more.
3 and 4 exemplify one in which one bottom setup line 24 is attached to the bottom 20c of the second unit B, but the number of bottom setup lines 24 is not limited to one. There may be two or more.
Furthermore, the number of bottom step reinforcements 14 in the first unit A and the number of bottom step reinforcements 24 in the second unit B may be different from each other.

  As a modification, the bottom setup line 14 of the first unit A is attached to a position near the first side part 10a in the bottom part 10c of the first unit A, and the bottom setup line 24 of the second unit B is attached to the second unit 10c. It is also possible to attach to a position close to the second side 20b of the bottom 20c of the unit B.

  Alternatively, the side step reinforcements 22 of the second unit B may be attached to the outside of the second side portions 20 b of the plurality of staples 20.

<Method of manufacturing RC beam shear unit>
The first unit A of the RC beam shear bar unit K according to the present embodiment includes a plurality of stirrups 10 obtained by bending a reinforcing bar into a U-shape, and the U-shapes of the adjacent stirrups 10 face the same direction, and The first side portions 10a of a plurality of staples 10 arranged at predetermined intervals so that the U-shapes overlap in the arrangement direction and aligned in the arrangement direction are connected to each other by the side step reinforcements 12, It manufactures by connecting the bottom parts 10c of the staples 10 with each other at the bottom parting bars 14.
In addition, the second unit B of the RC beam shear bar unit K according to the present embodiment includes a plurality of scallops 20 in which reinforcing bars are bent into a U shape, and the U shape of each adjacent slap 20 is directed in the same direction, And the second side portions 20b of the plurality of staples 20 arranged at predetermined intervals so that the U-shapes overlap in the arrangement direction and aligned in the arrangement direction are connected to each other by the side step bars 22; It manufactures by connecting the bottom parts 20c of a plurality of staples 20 with each other at the bottom parting bars 24.
Since the connection between the stirrup and the set-up bar does not require strength, the set-up bar is attached to the stirrup by simple welding at low pressure and low current using a welding wire in a factory or the like.

A dedicated semi-automatic welding robot is installed in the factory, and welding of the setup bars is carried out using welding wires, without affecting the stirrup and without losing the proof stress.
Since such a welding wire is used, it is possible to perform welding using a low voltage power supply of about 100V.
Welding is performed using a welding device for temporary attachment, which is different from the device used for welding structural materials such as scallops.

Semi-automatic welding of the side and bottom set-up bars as the minimum connecting bars necessary to give the strength required for transportation to the first unit A and the second unit B of the RC beam shear bar unit K .
Note that the connecting bars that are not attached at the factory are tightly bound together after assembling the RC beam shear bar unit K at the construction site.

(Steel type of rebar and name of rebar)
Table 1 shows the steel types of rebars and setup bars used for stirrups, and the names of rebars.

As a setup bar, steel types such as deformed bar steel, round steel, flat steel can be used, but it is not limited thereto.
The steel type used as the setup bar is a deformed bar steel such as SD295A (D6, D10, D13), but is not limited thereto, and round steel such as SR235 (Φ 9 mm) or flat steel (3. 2 to 6.0 mm) can be used.

Steel types used for the stirrup are high strength reinforcing bars (for example, reinforcing bars having a yield point of 590 to 1275 N / mm ² such as MK785) and ordinary reinforcing bars (for example, SD295 to SD490).
MK785 is a straight steel product, has little twisting effect during processing, can provide an accurate shear reinforcement, has no heat treatment, and has good stretchability and excellent weldability. .

  When the RC beam shear bar unit K is manufactured in a factory, it is possible to reduce labor in the factory and improve workability by applying low-voltage and low-current robot welding. Since welding of the main bar and the stirrup bar may have an adverse effect on the main bar, the assembly of reinforcing bars by welding has been limited in recent years. Since the assembly of the unit B does not require strength, it can be joined by welding so as not to cause a cross-sectional defect of the slap by welding. Furthermore, there is the advantage that quality control for robot welding in the factory is also improved.

<Construction method of RC beam using RC beam shear unit>
Next, an RC beam construction method using the RC beam shear bar unit according to this embodiment will be described.
The RC beam construction method using the RC beam shear bar unit of the present embodiment includes a first unit preparation step of preparing a first unit of the RC beam shear bar unit, and a second method of the RC beam shear bar unit. A second unit preparing step of preparing a unit, a transporting step of transporting the first unit and the second unit, a combining step of combining the first unit and the second unit, and the combined first unit and second unit; And a binding step of binding.
Hereinafter, each process will be described in detail with reference to FIG.

(First unit preparation process)
In the first unit preparing step, the first unit A of the RC beam shear rebar unit K according to the present embodiment is prepared (step S1).
Specifically, first, by bending the reinforcing bar in a U-shape, between the first side 10a, the second side 10b, and the first side 10a and the second side 10b A plurality of U-shaped stalaps 10 having bottoms 10c of
Next, the plurality of scallops 10 are arranged at predetermined intervals so that the U-characters of the adjacent scallops 10 face the same direction and the U-characters overlap in the arrangement direction.
Then, the outer sides of the first side portions 10a of the plurality of scallops 10 arranged in the arrangement direction are connected to each other by the side set-up bars 12, and the outer sides of the bottom portions 10c of the plurality of scallops 10 are connected to each other at the bottom set-up bars 14. Connect with

(Second unit preparation process)
In the second unit preparing step, the second unit B of the RC beam shear rebar unit K according to the present embodiment is prepared (step S2).
Specifically, first, by bending the reinforcing bar in a U-shape, between the first side 20a, the second side 20b, and the first side 20a and the second side 20b A plurality of U-shaped stalaps 20 having bottom portions 20c of are prepared.
Next, the plurality of scallops 20 are arranged at predetermined intervals so that the U-shapes of the adjacent scallops 20 face the same direction and the U-shapes overlap in the arrangement direction.
Then, the insides of the first side portions 20a of the plurality of staples 20 arranged in alignment in the arrangement direction are connected to each other by the side step reinforcements 22, and the insides of the bottom portions 20c of the plurality of staples 20 are bottom Connect with

  In the first unit preparation step and the second unit preparation step, the plurality of scallops 10 and 20 are connected by the side set-up bars 12 and 22 and the bottom set-up bars 14 and 24 by welding using a robot manipulator for arc welding.

The first unit preparation step and the second unit preparation step are preferably performed at a factory, but are not limited to this, and welding can also be performed at a construction site.
From the viewpoint of shortening the process and accuracy of welding, it is preferable to perform welding by a robot. However, in addition to welding by a robot, it is possible to perform welding by hand. It is also possible to prepare one unit A and a second unit B.

(Transportation process)
In the transporting process, the first unit A and the second unit B prepared in the first unit preparing process and the second unit preparing process are transported to the site where the RC beam is to be constructed (step S3). The transportation can be performed by transportation from a factory to a construction site using a truck, or by manual transportation from a welding site at the construction site to a construction site for RC beams.
At the time of transportation, as shown in FIGS. 7 and 8, the plurality of first units A and the plurality of second units B are alternately combined to be consolidated.
Here, since the first unit A and the second unit B differ in the position of the setup bar simply welded to the stapler, the plurality of first units A and the plurality of second units B are aggregated and transported during transportation. Since the appearance can be united, the space formed by the stapling and setup lines of each unit is occupied by other units, so that the track such as when the first unit A and the second unit B are in the finished product state The loading capacity can be increased.

(Combination process)
In the combination process, the first unit A prepared in the first unit preparation process and the second unit B prepared in the second unit preparation process are combined at the construction site transported in the transport process (step S4).
Specifically, as shown in FIG. 5, the end slap 10 in the arrangement direction of the first unit A and the end slap 20 in the arrangement direction of the second unit B are arranged adjacent to each other. combine.
More specifically, the first side portion 10a of the scallop 10 in the first unit A and the first side portion 20a of the scallop 20 in the second unit B are adjacent to each other, and The second side portion 10b and the second side portion 20b of the scallop 20 in the second unit B are adjacent to each other, the bottom portion 10c of the scallop 10 in the first unit A, and the bottom portion 20c of the scallop 20 in the second unit B Are combined so that they are adjacent to each other.

In the combination process, the first side portion 20a of the scallop 20 of the second unit B abuts on the side set-up bar 12 of the first unit A from the inside, and the second side portion 10b of the first unit A , The horizontal position of the plurality of scallops 10 of the first unit A and the plurality of scallops 20 of the second unit B are normal with respect to each other by combining the side setup bars 22 of the second unit B so as to contact from the inside. Is aligned to the position of.
Further, the bottom part 20c of the scallop 20 of the second unit B comes into contact with the bottom part setup line 14 of the first unit A from the inside, and the bottom part setup line 24 of the second unit B is arranged on the bottom part 10c of the first unit A. By combining so as to abut from the inside, the vertical positions of the plurality of staples 10 of the first unit A and the plurality of staples 20 of the second unit B are aligned with each other at regular positions.
As described above, the side set-up bars 12 and the bottom set-up bars 14 of the first unit A are attached to the outside of the scallop 10, and the side set-up bars 22 and the bottom set-up bars 24 of the second unit B are connected to the inside of the slap 20. The first unit A and the second unit B can be accurately aligned.

(Bundling process)
In the binding step, the first unit A and the second unit B combined in the combination step are bound (step S5). Specifically, the combined first unit A and second unit B are bound by a binding wire, and the units are tightly fixed to each other.
At this time, the binding between the first unit A and the second unit B may be a partial binding as long as the respective units are fixed to each other. Both ends of the combined first unit A and second unit B may be used. Each unit is mutually fixed by tying each part with a binding line.

  Then, after assembling the main reinforcement and other reinforcing bars to the RC beam shear bar unit K arranged in this way, the foundation beam is constructed by pouring concrete into the assembly.

  As described above, the RC beam construction method using the RC beam shear bar unit according to the present embodiment includes two types of units in which the position where the setup bar is simply welded to the stirrup is different. As a result, the binding work at the construction site can be largely omitted, so that the number of rebar workers assigned to the construction site can be reduced. Therefore, when constructing a reinforced concrete structure, the construction period can be shortened, and the reduction of the construction cost of RC beams and the rationalization of construction time can be achieved.

  Furthermore, human-powered construction using a small RC beam shear bar unit can be used for either work with a tow truck using a large RC beam shear bar unit. It is possible to construct RC beams according to the aspect corresponding to the site area of the construction site.

  As described above, the RC beam shear bar unit according to this embodiment has been exemplified and described as the foundation beam shear bar unit. However, the RC beam shear bar unit according to this embodiment is used for the construction of beams on the general floor. It is also possible to use

  The RC beam shear bar unit of the present invention can be used for the construction of RC beams such as foundation beams and general floor beams that reinforce the foundation and general floor when building a reinforced concrete building.

A 1st unit 10 stallap 10a 1st side 10b 2nd side 10c bottom 10d ridged end 10e 1st corner 10f 2nd corner 12 side step formation streak 14 bottom step formation streak p1 pitch _HA direction of arrangement B 2nd unit 20 stall 20a 1st side 20b 2nd side 20c bottom 20d ridged end 20e 1st corner 20f 2nd corner 22 side step formation 24 bottom step formation p 2 pitch H _B arrangement direction K RC beam shear bar unit p3 pitch H _C placement direction 30 setup bars

Claims (9)

A plurality of U-shaped staples comprising a first side, a second side, and a bottom between the first side and the second side, the U-shape of the adjacent said staples being A first unit arranged and connected at predetermined intervals so as to overlap in the arrangement direction;
A plurality of U-shaped staples comprising a first side, a second side, and a bottom between the first side and the second side, the U-shape of the adjacent said staples being A second unit arranged and connected at predetermined intervals so as to overlap in the arrangement direction;
RC beam shear unit including
In the first unit, a first side of each of the plurality of scallops is connected by a side setup line, and a bottom of each of the plurality of scallops is connected by a bottom setup line,
In the second unit, a second side of each of the plurality of scallops is connected by a side setup line, and a bottom of each of the plurality of scallops is connected by a bottom setup line,
The bottom setup line of either the first unit or the second unit is attached to the outside of the bottom,
The bottom setup line of the other of the first unit and the second unit is attached to the inside of the bottom ,
The first side of the sturlup in the first unit and the first side of the stalllap in the second unit are adjacent to each other,
The second side of the staple in the first unit and the second side of the staple in the second unit are adjacent to each other;
The RC beam shear bar unit, wherein the bottom part of the scallop in the first unit and the bottom part of the slap in the second unit are adjacent to each other . In the first unit, the side step reinforcement is attached to the outside of the first side,
2. The RC beam shear bar unit according to claim 1, wherein in the second unit, the side set-up bars are attached to the inside of the second side part. 3. In the first unit, the side step reinforcement is attached to the outside of the first side,
2. The RC beam shear bar unit according to claim 1, wherein in the second unit, the side setup bar is attached to the outside of the second side part. 3. The bottom step of the first unit is mounted at a position near the second side at the bottom of the first unit,
The RC construction according to any one of claims 1 to 3, wherein the bottom step reinforcement of the second unit is attached at a position near the first side at the bottom of the second unit. Beam shear bar unit. Wherein the first unit and the second unit, a plurality of adjacent intervals between the Sturup able claims 1 to 4 any one wherein at 20cm or more 40cm or less RC Zohari shear muscle units. A plurality of U-shaped staples comprising a first side, a second side, and a bottom between the first side and the second side, the U-shape of the adjacent said staples being The first sides of the plurality of staples are connected to each other by a side step and the bottoms of the plurality of studs are connected to each other by a bottom step. A first unit preparing step of preparing a first unit;
A plurality of U-shaped staples comprising a first side, a second side, and a bottom between the first side and the second side, the U-shape of the adjacent said staples being The second sides of the plurality of staples are connected to each other by a side step and the bottoms of the plurality of studs are connected to each other by a bottom step. A second unit preparing step of preparing a second unit;
A first side portion of the scallop in the first unit and a first side portion of the scallop in the second unit adjacent to each other; a second side portion of the scallop in the first unit; The first unit and the second side of the scallop in the second unit are adjacent to each other, and the bottom of the scallop in the first unit and the bottom of the slap in the second unit are adjacent to each other. A combination process of combining the second unit;
A binding step of binding the combined first unit and second unit;
Construction method of RC beam characterized by doing. 7. The RC according to claim 6 , wherein in the combining step, the first side portion of the scallop of the second unit is brought into contact with the side setup line of the first unit from the inside. How to build a beam. In the combination step, the bottom setup line of the first unit is in contact with the bottom setup line of the first unit from the inside, and the bottom setup line of the second unit is on the bottom of the first unit. 8. The RC beam construction method according to claim 6 or 7 , wherein the RC beam is combined so as to come into contact from the inside. The first unit preparing step and the second unit provided step one of claims 6 to 8, characterized in that it comprises the step of welding the side setup muscle and the bottom setup muscle plurality of said Sturup a simple welding Construction method of RC beam according to any one of the items.

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