JPH0623514B2 - Construction method of reinforced steel frame composite building frame - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of constructing a reinforced steel composite building frame in which columns are made of reinforced concrete and beams are made of steel frame.

[Prior Art] Conventionally, as a construction method of this kind of building frame, first, the foundation pillar of the foundation portion, the ground is excavated and root cutting is performed to construct the underground beam, and the foundation pillar and the underground After constructing the beams, build the floor of the bottom floor, and then erected a reinforced column on the floor surface of the bottom floor and cast concrete, after the concrete of that column has sufficient strength, Assemble the reinforced concrete columns and steel beams on each floor by the method of attaching steel beams to the anchor bolts and steel connections that were previously provided on the tops and sides of the columns, and then assemble them from the lower floors to the upper floors. The building frame was constructed by adding one to two floors toward each other.

[Problems to be Solved by the Invention] However, such a conventional construction method has a problem that the construction period is extended because the construction is performed step by step for each one floor. Further, since the work of assembling and joining the reinforcing bars of the columns of two or more floors is a high place work, it is said that there is a problem in workability and safety. Moreover, since the floors on the lowermost floor are constructed and then the pillars and beams on the upper floors are constructed, if the building has a large construction area, a special large-scale lifting facility is required to cover the entire area. Was required, and it was necessary to construct the building by dividing it in a plane so that it could be covered by an ordinary lifting machine.

The present invention solves such a conventional problem, and uses the reinforced steel frame composite column and the lower reinforcing rod set of the column newly developed by the present applicant.

[Means for Solving Problems] A method of constructing a reinforced steel frame composite building frame according to the present invention is a method of constructing a reinforced steel frame composite building frame, wherein columns are made of reinforced concrete and beams are made of steel. On the inside foundation, construct the lower rebar group of the column from the foundation to slightly above the leveling level, and place concrete on the lower rebar group to level the upper end of the lower reinforced concrete column. It is constructed so that it projects above the level, then backfills the soil to the leveling level, and then, before building the floor of the lowest floor, it is a self-propelled crane capable of self-propelled on the backfilled ground Reinforced steel composite column in which a joint structure for joining steel beams of multiple floors is attached in advance to a reinforced concrete car of a column having a length of one minute, and the composite steel column is hung above the lower reinforcing bar set, and the reinforcing bar Steel composite pillar It is characterized in that the lower end is joined to the upper end of the lower rebar group, and then the steel beams of each floor are hung and joined between the joint constituents of a plurality of reinforced steel composite columns.

[Operation] The construction method of the building frame of the composite structure of the reinforcing bar and the reinforcing member according to the present invention is, in order to form a pillar made of reinforced concrete, a lower reinforcing bar structure of a unitized pillar having a predetermined length and a length over a plurality of floors. We use a reinforced steel composite column that is a unitized structure in which the joint structure for joining the steel beams of multiple floors is attached in advance to the steel cage of the Sano pillar, while the steel reinforced steel frame is used to form the steel frame beam. It uses steel frames for each floor that are bridged between the joint components of the composite columns, and the columns and beams are related to each other, and the floor on the bottom floor is constructed during the construction. Before doing so, the soil is backfilled from the foundation of the pillar to the leveling level, and the pillar and beam are assembled by a self-propelled crane on the backfilled ground.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, the reinforced steel composite column and the lower reinforcing bar assembly of the column used in this method will be described.

The reinforced steel composite column is shown in Fig. 1 (f) by the reference numeral 1, and the reinforced concrete basket 2 of the reinforced concrete column having the length corresponding to the multiple floors is connected to the multiple floors. The structure 3 is attached. This reinforced steel composite column 1
Is pre-assembled on the ground in advance using a stand or a hanging jig with high accuracy.

In the present embodiment, the reinforced steel composite column 1 is provided with the three-story floor joint structure bodies 3, and each of these joint structure bodies 3 has a second floor, a third floor, and a rooftop steel beam. It is supposed to be joined. As shown in FIGS. 4 to 6, the joint structure 3 is composed of a beam steel frame portion 4 corresponding to the end of the steel beam and a frame-shaped plate / combination plate portion 5. In the illustrated structure, four steel beams are joined in a cross shape. That is, the beam steel frame portion 4 has a shape having a cross-shaped vertical plate 4c between the cross-shaped upper and lower horizontal plates 4a and 4b, while the formwork / plate portion 5 has an L-shaped cross section. The combination of two steel plates forms a cross shape as a whole, and surrounds a portion of the beam steel frame portion 4 near the center. At the center of the upper horizontal plate 4a in the beam steel part 4, one air hole 4d larger than the thickness of the vertical plate 4c is formed as shown in FIG. Therefore, this air hole 4d is
It is located across four corners of the vertical plate 4a below the horizontal plate 4a.

Reinforcing bar cage 2 is a combination of a large number of reinforcing bars, which connects three joint structure members 3 for three layers at a predetermined interval,
As a result, the unitized reinforced steel composite column 1 is configured. That is, the rebar cage 2 also serves as eight screw rebars 2a that continuously pass through the upper and lower horizontal plates 4a and 4b of the three joint structure bodies 3 and also as the formwork of each of the three joint structure bodies 3. Four corner rebars (deformed bars) 2b continuously penetrating the inner corners of the plate portion 5 and four penetrating four upper and lower horizontal plates 4a, 4b of each joint structure body 12 in total. It has shear rebar 2c. Therefore, each of the 8 screw rebars 2a and the 4 corner rebars 2b is a long series extending over 3 stories.
Further, the twelve shear reinforcing bars 2c in total are slightly longer than the intervals between the upper and lower horizontal plates 4a, 4b of the corresponding port forming body 3. Then, the respective joint structure bodies 3 are connected by screwing onto the screw reinforcing bars 2a and the shear reinforcing bar 2c and tightening the fixing nuts 2d which sandwich the respective joint structure bodies 3 from above and below. Also, rebar basket 2
Has a large number of hoop muscles 2e over its entire length. The hoop reinforcement 2e is also provided inside the joint structure 3, and the reinforcement reinforcement 2e is provided at a proper position inside the rectangular columnar shape by the screw reinforcement 2a and the corner reinforcement 2b.
A buckling prevention frame (not shown) for preventing inward buckling of a and 2b is provided. A plate 2f is attached to the lower side of the reinforcing bar cage 2.

On the other hand, the lower rebar assembly of the pillar is composed of a large number of rebars assembled between the base plate 6a at the lower end and the template 6b at the upper end, as indicated by reference numeral 6 in FIG. 1 (b). , It constitutes a unitized reinforced cage that hits the underground part of a reinforced concrete column. This lower rebar assembly 6
It is preliminarily assembled on the ground in advance by using a mount or a hanging jig, and is set to a length from the foundation G in the ground to slightly above the leveling level L. In addition, the rebars that are combined are the same as the total of eight screw rebars 2a, four corner rebars 2b, and a large number of hoop rebars 2e in the rebar cage 2 of the rebar-steel composite column 1 described above. (Indicated by the same reference numerals in the figure), the reinforcing bars are connected by joining with the reinforcing steel-frame composite columns 1. In the case of the present embodiment, the hoop reinforcements 2e in the middle portion of the lower reinforcing bar assembly 6 are not fixed in place before they are brought to the site, and are used as underground reinforcing steel bars during the construction stage of the building frame. It will only be locked in place when assembled.

Next, an actual construction method of a building frame using the reinforced steel frame composite column 1 and the column lower side reinforcing bar set 6 having the above-described configurations will be described in the order of the steps.

First, as shown in FIG. 1 (a), the position where the pillar is to be built is deeply dug, root cutting for building the lower reinforcing bar assembly 6 of the pillar is performed, and then discarded concrete C ₁ is cast. At that time, four hooks 7 are embedded in the four corners of the discarded concrete C ₁ . The discarded concrete C ₁ in the central part where the pillar is built is 1
It is struck relatively thickly to about 25 mm.

After that, the cores of the pillars are marked on the discarded concrete C ₁ and four resin anchors 8 are struck according to the marks (see FIG. 7). This anchor 8 is securely fixed because the discarded concrete C ₁ is relatively thick. then,
As shown in FIG. 1 (b), the lower reinforcing bar assembly 6 of the above-mentioned pillar is hung in a standing state, and the base plate 6a at the lower end thereof
Insert the anchors 8 into the holes at the four corners. Then, the nut 9 screwed to the anchor 8 is tightened so as to sandwich the base plate 6a from above and below. In this way, the lower end of the lower reinforcing bar assembly 6 is uniquely accurately and promptly positioned. Then, the chain 10 and the turnbuckle 11 and the reinforcing bar hook 12 are chained over the four corners of the template 6b at the upper end of the lower reinforcing bar set 6 and the hook 7, respectively, and the four turnbuckles 11 in total are adjusted. Then, rebuild the lower rebar assembly 6.

Then, as shown in FIG. 1 (c), the footing reinforcement and the lath form 13 are attached, and concrete C ₂ is hit to perform footing.

After that, the four turnbuckles 11 are adjusted again, and the lower reinforcing bar set 6 is rebuilt for the second time. then,
As shown in Fig. 1 (d), backfill the soil to the top of the footing. At that time, tighten the water. Then, as shown in the same figure, after installing the underground beam reinforcement and the lath form of the underground reinforcement so as to intersect the lower reinforcing bar set 6, concrete is struck and the underground beam 14 of reinforced concrete is struck. To make. In the case of the present embodiment, the hoop reinforcement 2e in the middle portion of the lower reinforcing bar set 6 is fixed in place for the first time when the underground beam reinforcement is performed.

After that, the chain 10 and the tassi buckle 11 are removed, the soil is backfilled to the leveling level L, the pillar formwork is set, and then the rising portion of the pillar is concrete-cast. As a result, as shown in FIG. 1 (e), the underground beam 14 of reinforced concrete and the foundation side of the column of reinforced concrete were constructed. On the foundation side of the column, since the lower reinforcing bar set 6 has a length from the foundation G in the ground to slightly above the ground level L, the rising portion thereof is at the ground level L.
Will be located slightly above.

Then, as shown in FIG. 1 (f), the reinforced steel frame composite pillar 1 described above, that is, the reinforcing bar cage 2 is hung in a state in which the unit in which the three joint structure bodies 3 for the three floors are attached is erected. It is located above the side reinforcing bar set 6. For this hoisting, it is possible to use a normal-sized truck crane or the like that works by entering the site. This is because the site at this point is backfilled, and there is only a rising part on the foundation side of the pillar on the leveling level L.
This is because it does not hinder the movement of a truck crane or the like. In this respect, it is effective to set the length of the lower reinforcing bar set 6 to a length from the foundation G in the ground to slightly above the ground level L. Before and after the suspension of the reinforced steel composite column 1, the sleeve joint 15 is fitted to all of the upper reinforcing bars 2a and 2b of the lower reinforcing bar set 6, and the wire 16 for re-installing the reinforced steel composite column 1 is installed. Stretch. In the case of the present embodiment, a total of four wires 16 are stretched between the second-floor joint structure 3 and the foundation side of the other adjacent column,
Each wire 16 is provided with a turnbuckle 17.

After that, the sleeve joints 15 located at the four corners of the lower reinforcing bar assembly 6 side, that is, the sleeve joints 15 on the upper ends of the corner reinforcing bars 2b are pulled up by a predetermined amount, and the upper portion of the sleeve joints 15 is connected to the corresponding reinforcing steel composite column 1 side. Fit it to the lower end of the corner reinforcing bar 2b. then,
A total of four turnbuckles 17 for each wire 16 are adjusted to rebuild the reinforced steel frame composite pillar 1, and after the predetermined accuracy is obtained, the sleeve joints 15 at the four corners are crimped. The crimping machine for this crimping is, for example, a reinforced steel composite column 1
The sleeve joints 15 are attached to the hanging jigs set in step 1, and the sleeve joints 15 at the four corners are crimped in order from diagonal positions.

Then, remove the sling of the reinforced steel composite column 1. then,
The remaining sleeve joints 15, that is, a total of eight sleeve joints 15 for connecting the lower reinforcing bar assembly 6 and the respective screw reinforcing bars 2a of the reinforcing steel composite column 1 are crimped. This pressure bonding is also performed in order from the diagonal position. Then, the hoop muscles 2e are attached to the joint portion of the sleeve joint 15 at a predetermined pitch. By loading and assembling the reinforced steel composite column 1 in this manner, the reinforcing rods of the columns from the first floor to the roof and the joints for the three floors are completed at once.

Then, as shown in FIG. 1 (g), the beams 18 of the second and third floors and the rooftop reinforced steel bar 18 are hung between the joint structures 3 of the adjacent reinforced steel composite columns 1 using a crane. Pass and attach. At that time, the turnbuckle 17 is loosened so that the beam 18 can be easily bridged. Then, the deck plates for the second floor, the third floor, and the rooftop are temporarily placed, and the wires stretched from the beam 18 on the second floor are used for re-installation, and then the bolts at the respective joints are fully tightened. Then, the deck plate is attached and the studs on the beam 18 are driven.

After that, concrete is poured from the first floor to the upper floors in the same construction method as a normal reinforced steel concrete building. For example, first set the formwork on the reinforced steel composite pillar 1 on the first floor, perform the slab reinforcement and mesh laying on the second floor, and then concrete on the slab on the second floor and the reinforced steel composite pillar 1 on the first floor. To place. Next, in the same manner, concrete is placed on the slab on the third floor and the reinforced steel composite columns 1 on the second floor, and concrete is placed on the slab on the rooftop, and then the reinforced steel composite columns on the third floor are placed. Pour concrete into 1. In such a construction method,
It is possible to simultaneously perform the concrete pouring of the slab on the second floor and the reinforced steel composite column 1 on the first floor, and the concrete slab on the third floor and the concrete reinforced steel composite column 1 of the second floor at the same time.

By the way, when concrete is placed in the joint structure 3 of the reinforced steel frame composite pillar 1, the air that remains at the four corners of the vertical plate 4a below the horizontal plate 4a is one air. Escape from hole 4b. Therefore,
The one air hole 4b serves as four air holes. This is extremely advantageous in forming the air holes.

Further, the plate portion 5 of the joint structure 3 also serves as a frame shape and restrains the concrete inside, and forms a part of the column of reinforced concrete as it is. Therefore, no mold is required for the joint portion. Then, as a result of constraining the peripheral portion of the joint portion by the steel plate portion 5 in this manner, it becomes possible to set the allowable compressive stress degree of the filled concrete in that portion to 5 to 10 times the design standard strength. . In addition to this, the shear reinforcement 2c partially reinforces the joint structure 3 by tightening nuts, so that the joint portion is given sufficient strength to meet the demand. Further, since the deck plate is adopted for the floor, it is not necessary to assemble and disassemble the beam form, the floor form and the form support material by plywood.

In addition, the number of the joint structure 3 provided in the reinforced steel frame composite pillar 1 is
It is arbitrary and is not specified in the above embodiment. Further, in the above-mentioned embodiment, the joint structure 3 has a cross shape in order to join four beams to one joint, but the number of joints of the beam to the joint is
It is needless to say that the shape of the joint structure 3 can be appropriately changed according to the joining form and the like.

[Effects of the Invention] As described above, the method for constructing a reinforced-steel composite building structure according to the present invention forms a pillar made of reinforced concrete, so that the length from the foundation in the ground to a little above the leveling level can be achieved. Unitized reinforced steel composite column in which the lower reinforced steel set of the unitized column and the reinforcing bar cage of the column that spans multiple stories are pre-installed with the joint structure for joining the steel beam of multiple stories Using and, the latter reinforced steel composite column is joined to the former lower reinforced steel set built on the foundation, so when the reinforced steel composite column is carried in and built, Reinforcing bars and connections for multiple floors are completed at once. In addition to this, the lower reinforced steel frame set and the reinforced steel frame composite column are first assembled into a unit, so that the construction period can be significantly shortened. Also, since the lower rebar group and the rebar-steel composite columns can be assembled in advance on the ground with high accuracy,
The workability is excellent and the safety of the work can be secured.

In addition, since the lower reinforced concrete set of the pillar with a length slightly above the ground level is built and concrete is placed, the upper end of the lower reinforced concrete pillar is constructed to project above the ground level. After that, when filling the soil to the leveling level and then joining the steel-reinforced composite column to the upper end of the lower reinforced concrete of the column, the joining work can be performed on the backfilled ground, and this joining can be done as in the past. Since it is not necessary to perform the work at a high place above the beams on the upper floor, workability and safety can be improved.

In addition, before constructing the floor on the lowest floor, backfill of soil from the foundation to the leveling level is performed, and a self-propelled crane of a normal scale such as a truck crane capable of self-propelled on the backfilled ground is used. We got into the site where the reinforced steel frame composite columns were joined and made this crane self-propelled to assemble the columns and beams. For this reason, in order to assemble the pillars and beams, there is no need for special large-scale stationary lifting equipment,
Moreover, with the usual self-propelled crane, it is possible to construct the pillars and beams in the entire construction area at once without dividing the building to be constructed in a plane and dividing it, thus reducing the cost of lifting equipment and construction. be able to. Also,
Since it is possible to directly enter a transportation vehicle such as an assembly material on the backfilled ground, the same worker can perform lifting and assembly work near the assembly work site,
The number of workers involved in these operations can be reduced, which makes it easier to carry in and assemble the assembly materials, reduce labor costs, and further shorten the construction period.

[Brief description of drawings]

Drawing shows one example of this invention, Drawing 1 (a)-(g) is an explanatory view showing the construction method of this invention according to the order of the process, and Drawing 2 is a top view of the base plate of a lower side reinforcement set, FIG. 3 is a plan view in the state of FIG. 1 (b), FIG. 4 is a perspective view of the joint structure, FIG. 5 is a cross sectional view of the joint structure, and FIG.
FIG. 7 is a plan view of the joint structure, and FIG. 7 is an explanatory view of the joint portion at the lower end of the lower reinforcing bar assembly. 1 ... Reinforced steel composite column, 2 ... Reinforcing cage, 3 ... Connection structure, 6 ... Lower rebar assembly G ... Foundation, L ... Leveling level.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshimi Kaihara 2-16-1 Kyobashi, Chuo-ku, Tokyo Within Shimizu Construction Co., Ltd. (72) Inventor Yasutaka Sunonouchi 2-1-1-16 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hideaki Yamamoto 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (56) Bibliography 57-163903 (JP, U) JPB 45 -13904 (JP, B1)

Claims (1)

[Claims] 1. A method of constructing a composite structure of reinforced steel frames, wherein the columns are made of reinforced concrete and the beams are made of steel. Build a lower reinforced concrete set, pour concrete into the lower reinforced concrete set so that the upper end of the lower reinforced concrete column projects above the leveling level, then backfill the soil to the leveling level, After that, before constructing the floor on the bottom floor, a self-propelled crane that can self-propelled on the backfilled ground was used to join the steel beams for multiple floors to the reinforcing bar cage of the pillars of multiple lengths in advance. The reinforced steel composite column to which the joint structure is attached is suspended and positioned above the lower reinforcing bar set, and the lower end of the reinforcing bar composite column is joined to the upper end of the lower reinforcing bar set, and then a plurality of buildings Reinforced steel composite column joint Method of constructing architectural framework rebar steel composite, characterized in that joining spanned the steel beam of each floor therebetween adult.