JP7411749B2 - How to construct a concrete building - Google Patents

Description

The present invention relates to a method for constructing a concrete building, in which a precast concrete column member and a beam member are joined together to construct a concrete column and beam frame on the upper side.

As a construction method for concrete buildings, there is a method in which a concrete column-beam frame is constructed by joining PCa (precast concrete) column members and beam members using mechanical joints. Patent Document 1 discloses that two pillar members of two levels are installed at an interval in the horizontal direction, and a beam member of two spans is constructed between the pillar-beam joints of both pillar members.

Patent No. 5205131

In the conventional method of constructing a concrete building described above, since the weight of the column members and beam members is large, it is necessary to lift the column members and beam members using a special large-sized lifting machine.
An object of the present invention is to provide a method of constructing a concrete building that can construct a concrete building in a short period of time without using a special large-scale lifting machine.

In order to solve the above-mentioned problems, a first invention is a method for constructing a concrete building, comprising: a first column member made of precast concrete with a height of one story; and a first column member with a height of one story including a column-beam joint. and second pillar members made of precast concrete that are integrally molded so as to exceed the height of the second pillar member, and are installed alternately at intervals in the horizontal direction, or only the second pillar member is installed in advance every two spans. In the first step, move the precast concrete beam member with embedded reinforcing bar joints in the horizontal direction against the beam end reinforcement protruding from the side of the column-beam joint on the first floor of the second column member. and a second step of fitting and joining the beam end reinforcement to the reinforcing bar joint, the first column member or the first column member installed after the second step, and the beam member. a third step of pouring concrete between them, providing an on-site concrete pouring beam portion, and joining the first column member and the beam member; A fourth step of joining the two pillar members and joining the other first pillar member to the upper end of the second pillar member, and repeating the second to fourth steps, the concrete pillar and beam are joined together. a fifth step of constructing a frame, wherein the second column member exceeds the height of the first floor, and the lower end surface of the beam member of the second floor, excluding the column-beam joint of the second floor, It is characterized by being a pillar member formed at a height between.

In the first invention, a PCa beam member (for example, one span beam members) are connected using mechanical joints to construct a column-beam frame. By setting the length of the second column member to be greater than the height of the first floor and less than the height between the column and beam joint of the second floor, PCa can be manufactured even outside of large-scale PCa manufacturing factories. The size of the pillars was set, and the weight of the PCa pillars was set so that it could be loaded without a special transport vehicle. Therefore, PCa column members and PCa beam members that constitute a concrete column-beam frame can be lifted without using a special large-sized lifting machine, and a concrete building can be constructed in a short period of time.
In addition, in the first invention, instead of constructing a concrete building by assembling PCa columns for one floor and PCa beam members for one span, as in the prior art, the PCa columns for one floor are used as column members. An RC building is constructed using the first column member and the second column member, which exceeds the height of the first floor and is formed at a height between the column and beam joints of the second floor. As one of the column members, the second column member of PCa construction, which exceeds the height of the first floor and is formed at the height between the column and beam joint of the second floor, is used to increase the height of each column for one floor. There is no need to provide joints to join the column members together, and the construction period can be shortened. Furthermore, construction costs can be reduced by reducing the number of joints between column members.
In addition, in the first invention, the second column member and the beam end side of the PCa beam member are joined by a mechanical joint, and the other beam side of the PCa beam member is connected to the on-site concrete pouring beam portion. and is connected to the first pillar member made of PCa. Therefore, the vertical accuracy of the first column member can be adjusted by joining the beam member made of PCa construction and the first column member made of PCa construction via the on-site concrete casting beam portion.

In the method for constructing a concrete building described above, in the second step, the gap provided between the column-beam joint and the beam end face of the beam member is covered with a formwork material, and The filling material is injected from an injection port provided at the end of the beam to fill the interior of all the reinforcing bar joints with the filling material at once.
According to this invention, the beam end reinforcement protruding from the side surface of the column-beam joint of the second column member or the fourth column member made of PCa is embedded in the beam end of the beam member made of PCa. In the state where the fittings are fitted, filler is injected from the injection port provided at the end of the beam of the beam member to fill the inside of all the reinforcing bar joints with the filler. The gap provided between each column-beam joint and the beam end face of the beam member is covered with formwork material, and all reinforcing bar joints are connected, so that the second or fourth column It is possible to fill the inside of the reinforcing bar joint with the filler material at once without providing a concrete pouring section between the member and the beam member, and each column member and beam member can be mechanically It can be joined with a joint.

With the method for constructing a concrete building of the present invention, a concrete building can be constructed in a short period of time without using a special large-scale lifting machine. Further, in the method for constructing a concrete building of the present invention, the number of joints between column members is reduced, so the construction period can be shortened. Moreover, with the method of constructing a concrete building of the present invention, construction costs can be reduced.

FIG. 1 is a front view showing a column-beam frame of a building according to a first embodiment of the present invention. It is a perspective view showing each member in a building concerning a first embodiment of the present invention. 1 is a flowchart of a building construction method according to a first embodiment of the present invention. FIG. 6 is a front view showing a state in which a beam member is joined to a second column member in the building construction method according to the first embodiment of the present invention. FIG. 3 is a front view showing a state in which a first pillar member is installed in the building construction method according to the first embodiment of the present invention. FIG. 2 is a front view showing a state in which a first pillar member and a beam member are joined in the building construction method according to the first embodiment of the present invention. FIG. 7 is a front view showing a state in which another second pillar member is joined to the first pillar member and a beam member is joined to the second pillar member in the building construction method according to the first embodiment of the present invention. FIG. 6 is a front view showing a state in which other first pillar members are joined to the left and right second pillar members, respectively, in the building construction method according to the first embodiment of the present invention. FIG. 7 is a front view showing a state in which another first column member and a beam member are joined in the building construction method according to the first embodiment of the present invention. It is a front view showing a mechanical joint between a second column member and a beam member in the building according to the first embodiment of the present invention. FIG. 11 is a sectional view taken along line XI-XI in FIG. 10 showing a mechanical joint between a second column member and a beam member in the building according to the first embodiment of the present invention. FIG. 2 is a front view showing a column-beam frame of a building according to a reference example of the present invention. FIG. 2 is a perspective view showing each member in a building according to a reference example of the present invention. 3 is a flowchart of a building construction method according to a reference example of the present invention. FIG. 7 is a front view showing a state in which a beam member is joined to a fourth pillar member in a building construction method according to a reference example of the present invention. FIG. 7 is a front view showing a state in which a third column member and a beam member are joined in a building construction method according to a reference example of the present invention.

Embodiments and reference examples of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in the description of the embodiment and the reference example , the same components will be denoted by the same reference numerals, and redundant description will be omitted.

[First embodiment]
FIG. 1 is a front view showing a column-beam frame of a building according to a first embodiment of the present invention. FIG. 2 is a perspective view showing each member in the building according to the first embodiment of the present invention.
As shown in FIG. 1, a concrete building 1A (hereinafter referred to as "building") of the first embodiment includes a concrete column-beam frame 2A. As shown in FIG. 2, the column-beam frame 2A is composed of a first column member 10A, a second column member 20A, a beam member 30, and an on-site concrete placement beam portion 40 (see FIG. 1). In addition, in FIG. 2, in order to clearly show the structure of each member, the numbers of reinforcing bars and joints are adjusted as appropriate.

As shown in FIG. 1, the first pillar member 10A is a vertical member made of PCa and has a height F1 of one story. A plurality of column end reinforcements 11 protrude upward from the upper end surface of the first column member 10A. The column end reinforcement 11 is the upper end of the main reinforcement of the first column member 10A.
A plurality of reinforcing bar joints 12 are embedded in the lower end of the first column member 10A. The reinforcing bar joint 12 is a cylindrical sleeve. The lower end of each reinforcing bar joint 12 is open to the lower end surface of the first column member 10A.
As shown in FIG. 1, the height from the lower end surface to the upper end surface of the first pillar member 10A is set to the height F1 of one story.
In the first column member 10A, a plurality of beam end reinforcements 13 protrude laterally from both side surfaces at positions corresponding to the height of each floor (see FIG. 2). That is, at the height position of the beam member 30 provided for each floor, the beam end reinforcement 13 protrudes from the side surface of the first column member 10A.

As shown in FIGS. 1 and 2, the second pillar member 20A is a vertical member made of PCa and has a height F1.5 of 1.5 floors. A plurality of column end reinforcements 21 protrude upward from the upper end surface of the second column member 20A. The column end reinforcement 21 is the upper end of the main reinforcement of the second column member 20A.
A plurality of reinforcing bar joints 22 are embedded in the lower end portion of the second column member 20A. The reinforcing bar joint 22 is a cylindrical sleeve. The lower end of each reinforcing bar joint 22 is open to the lower end surface of the second column member 20A.
As shown in FIG. 1, the height from the lower end surface to the upper end surface of the second column member 20A is set to be the same as the height between the column-beam joint J of the second floor and the first floor or more. That is, the second column member 20A is formed to have a height of one or more floors, and the lower end surface of the second column member 20A has a height equivalent to the upper surface of the beam member 30 of the nth floor (n is an integer). The upper end surface of the second column member 20A is located at a height between the upper surface of the beam member 30 on the n+1st floor and the lower surface of the beam member 30 on the n+2nd floor.
The upper end surface of the second column member 20A of the first embodiment is arranged at the center between the column-beam joint J on the first floor and the column-beam joint J on the second floor. In other words, the height H2 of the second pillar member 20A of the first embodiment is set to the height F1.5 of 1.5 floors.
Column-beam joints J are formed in the second column member 20A at positions corresponding to the height of each floor. As shown in FIG. 2, a plurality of beam end reinforcements 23 protrude laterally from the side surface of the column-beam joint J.

The beam member 30 is a horizontal member made of PCa. As shown in FIG. 1, the beam member 30 is constructed between the first column member 10A and the second column member 20A. The length of the beam member 30 in the horizontal direction is smaller than one span between the first column member 10A and the second column member 20A.
A first end portion 31 of the beam member 30 on the first column member 10A side is joined to the first column member 10A via an on-site concrete placement beam portion 40.
The second end portion 32 of the beam member 30 on the second column member 20A side is joined to the column-beam joint J of the second column member 20A by a mechanical joint 50.

The end surface of the first end 31 of the beam member 30 is spaced apart from the side surface of the first column member 10A.
A plurality of beam end reinforcements 33 protrude laterally from the end surface of the first end 31 of the beam member 30 (see FIG. 2). The beam end reinforcement 33 is the end of the main reinforcement of the beam member 30. The beam end reinforcement 33 of the beam member 30 and the beam end reinforcement 13 of the first column member 10A are connected.
FIG. 6 is a front view showing a state in which the first pillar member and the beam member are joined in the building construction method according to the first embodiment of the present invention.
As shown in FIG. 6, between the end face of the first end 31 of the beam member 30 and the side surface of the first column member 10A, concrete is poured on-site to construct the on-site concrete-casting beam section 40. By doing so, the beam member 30 is joined to the first column member 10A.

Next, a method for constructing the building 1A according to the first embodiment will be described with reference to the flowchart in FIG. 3.
FIG. 4 is a front view showing a state in which a beam member is joined to a second column member in the building construction method according to the first embodiment of the present invention.
Step S11 includes a part of the "first step" in the claims. In step S11 of the first embodiment, as a work included in the first step, as shown in FIG. Make it stand out.
In step S11 of FIG. 3, a plurality of second pillar members 20A are installed in advance of the first pillar member 10A at intervals of two spans in the horizontal direction. At this time, each reinforcing bar 5 protruding from the ground surface is inserted into each reinforcing bar joint 22 of the second column member 20A, filler is injected into each reinforcing bar coupling 22, and the second column member 20A is connected to the ground. Fix it on the top surface.

FIG. 5 is a front view showing a state in which the first pillar member is installed in the building construction method according to the first embodiment of the present invention.
Step S12 includes the remaining operations of the "first step" and the operations of the "second step" in the claims. In step S12 of the first embodiment, first, as a second step, the beam member 30 is lifted by a lifting machine and placed between the two second column members 20A, 20A, and the beam member 30 is moved in the horizontal direction. , as shown in FIG. 5, the second end portion 32 of the beam member 30 is joined to the column-beam joint J of the second column member 20A by a mechanical joint 50.

After joining the beam members 30 one by one to both the second pillar members 20A, 20A, the first pillar member 10A is installed between the two beam members 30, 30 as the remaining work of the first step. As shown in FIG. 6, each reinforcing bar 5 protruding from the ground surface is inserted into each reinforcing bar joint 12 provided at the lower end of the first column member 10A, and filler is injected into each reinforcing bar fitting 12. This fixes the first pillar member 10A to the ground surface. In this way, the first pillar member 10A is installed between both the second pillar members 20A, 20A, and the first pillar member 10A and the second pillar member 20A are installed alternately in the horizontal direction.
Step S13 includes the operation of the "third step" in the claims. In the third step of the first embodiment, as shown in FIG. 6, the space between the first column member 10A and the beam member 30 is surrounded by a formwork, and concrete is poured into the formwork, An on-site concrete placement beam portion 40 is provided between the first column member 10A and the beam member 30. Specifically, after connecting the beam end reinforcement 13 protruding from the column surface of the column-beam joint of the first column member 10A and the beam end reinforcement 33 of the beam member 30 with a reinforcing bar joint, Concrete is poured to form an on-site concrete pouring beam portion 40, and the first column member 10A and the beam member 30 are joined. Thereby, a one-story column-beam frame 2A can be constructed using the first column member 10A, the second column member 20A, the beam member 30, and the on-site concrete placement beam section 40.

FIG. 7 is a front view showing a state in which another second pillar member is joined to the first pillar member and a beam member is joined to the second pillar member in the building construction method according to the first embodiment of the present invention. It is a diagram. FIG. 8 is a front view showing a state in which other first pillar members are joined to the left and right second pillar members, respectively, in the building construction method according to the first embodiment of the present invention.
Step S14 includes the "fourth step" in the claims. In the fourth step of the first embodiment, after the beam member 30 is joined to the first pillar member 10A, as shown in FIG. 7, another second pillar member 20A is joined to the upper end of the first pillar member 10A. . At this time, each column end reinforcement 11 protruding from the upper end surface of the first column member 10A is inserted into each reinforcing bar joint 22 provided at the lower end of the other second column member 20A, and each reinforcing bar coupling By injecting a filler into 22, the other second pillar member 20A is joined to the upper end surface of the first pillar member 10A.
The other second column member 20A is provided with a column-beam joint J at a position that becomes the height F2 of the second floor when joined to the upper end of the first column member 10A.

FIG. 9 is a front view showing a state in which another first column member and a beam member are joined in the building construction method according to the first embodiment of the present invention.
In step S15 (the "fourth step" in the claims), another first pillar member 10A is joined to the upper end portion of the second pillar member 20A. At this time, as shown in FIG. 9, each column end reinforcement 21 protruding from the upper end surface of the second column member 20A is attached to each reinforcing bar joint 12 provided at the lower end of the other first column member 10A. By inserting the reinforcing bar and injecting a filler into each reinforcing bar joint 12, the other first column member 10A is joined to the upper end surface of the second column member 20A.
In step S16 (the "fifth step" in the claims), the steps from the second step (step S12 to the fourth step (step S15)) are repeated, and the first pillar member 10A, the second pillar member 20A, and the beam As shown in FIG. 1, a building 1A having a column-beam frame 2A is constructed by stacking the members 30 and the on-site concrete-cast beam parts 40 in layers.

Next, the mechanical joint 50 provided at the joint portion between the second end portion 32 of the beam member 30 and the column-beam joint J of the second column member 20A will be described.
FIG. 10 is a front view showing a mechanical joint between a second column member and a beam member in a building according to the first embodiment of the present invention.
As shown in FIG. 10, the mechanical joint 50 connects a plurality of reinforcing bar joints 34 buried in the second end 32 of the beam member 30 with a beam end protruding from the column-beam joint J of the second column member 20A. It is formed by fitting the partial reinforcements 23 and injecting the filler G into each reinforcing bar joint 34 and hardening it.

A plurality of reinforcing bar joints 34 are embedded in the lower part of the second end 32 of the beam member 30. The reinforcing bar joint 34 is a cylindrical sleeve. One end of each reinforcing bar joint 34 is open to the end surface of the second end 32 of the beam member 30.
A beam end reinforcement 23 protruding from the column-beam joint J of the second column member 20A is inserted into one end of the reinforcing bar joint 34. The end of the main reinforcement 38 of the beam member 30 is inserted into the other end of the reinforcing bar joint 34 .
FIG. 11 is a sectional view taken along line XI-XI in FIG. 10 showing a mechanical joint between a second column member and a beam member in a building according to the first embodiment of the present invention.
In the first embodiment, as shown in FIG. 11, a plurality of reinforcing bar joints 34 arranged at intervals in the width direction of the beam member 30 are arranged in upper and lower two stages. Six reinforcing bar joints 34 are arranged in the width direction of the beam member 30 in the lower row, and five reinforcing bar joints 34 are arranged in the width direction of the beam member 30 in the upper row.

A plurality of holes 35 are formed in the beam member 30 , each communicating with the inside of each reinforcing bar joint 34 from the side surface of the second end 32 . A plurality of holes 35 each communicating with each of the reinforcing bar joints 34 arranged in a half region on one side in the width direction of the beam member 30 are open on one side surface of the beam member 30 . Further, a plurality of holes 35 each communicating with each of the reinforcing bar joints 34 arranged in a half region on the other side in the width direction of the beam member 30 are open on the other side side surface of the beam member 30 .
The hole 35 has an inclined part 35a extending diagonally upward from the upper part of the reinforcing bar joint 34, and extends horizontally from the upper end of the inclined part 35a toward the side surface of the beam member 30. It is open on the side. The inclined portion 35a of the first embodiment is inclined at an angle of 28 degrees with respect to the vertical direction. The opening of the hole 35 is closed by a lid member 35b.
As shown in FIG. 11, two holes 35, 35 communicate with one reinforcing bar joint 34. The two holes 35, 35 are arranged at intervals in the longitudinal direction of the beam member 30.

As shown in FIG. 10, each reinforcing bar joint 34 and each hole 35 are filled with a filler G such as grout. After the filling material G is filled into all the reinforcing bar joints 34 and all the holes 35 at once from the injection port 35c set at the lowest opening among the openings of each hole 35, It is hardened within each reinforcing bar joint 34 and each hole 35.
As shown in FIG. 11, a gap 36 is formed between the end surface of the second end portion 32 of the beam member 30 and the side surface of the second column member 20A. Before each reinforcing bar joint 34 is filled with filler G (see FIG. 3), the inside of each reinforcing bar joint 34 communicates through the gap 36.

As shown in FIG. 5, when the beam member 30 is joined to the second column member 20A using the mechanical joint 50, each beam end protruding from the column-beam joint J of the first floor of the second column member 20A The sub-reinforcements 23 are inserted into each reinforcing bar joint 34 of the beam member 30, respectively.
At this time, as shown in FIG. 11, a gap 36 is formed between the end surface of the second end 32 of the beam member 30 and the side surface of the second column member 20A. As a result, the interiors of each reinforcing bar joint 34 communicate with each other through the gap 36. Furthermore, a formwork 6 is installed around the gap 36 to close the gap 36.
As shown in FIG. 10, when the filler G is press-fitted from the injection port 35c, the filler G flows from the reinforcing bar joint 34 into the gap 36, and then from the gap 36 into each reinforcing bar coupling 34. is press-fitted, and furthermore, the filler G is press-fitted into the hole 35 from the reinforcing bar joint 34. After the filler G is discharged from the opening of the hole 35 on the side surface of the beam member 30, the opening of the hole 35 is closed by the lid member 35b. Note that since the inclined portion 35a of the hole 35 is inclined at an angle of 28 degrees with respect to the vertical direction, the filler G is easily filled from inside the reinforcing bar joint 34 toward the opening of the hole 35. .
In this way, after filling the filler G into all the reinforcing bar joints 34 and all the holes 35 at once, the filler G hardens inside each reinforcing bar fitting 34 and each hole 35. , the second end portion 32 of the beam member 30 is joined to the column-beam joint J of the second column member 20A by a mechanical joint 50.

In the method for constructing the building 1A of the first embodiment as described above, as shown in FIG. Since the column-beam frame 2A can be constructed by joining the beam member 30 of one span or less to the second column member 20A, the weight of the first column member 10A, the second column member 20A, and the beam member 30 can be reduced. can. Therefore, the concrete building 1A can be constructed in a short period of time without using a special large-scale lifting machine.
In addition, in the construction method of the building 1A of the first embodiment, the number of joints between column members can be reduced compared to the case where a column-beam frame is constructed using only column members of one story height, so the construction period can be shortened. It is possible and the construction cost can be reduced.
Moreover, in the construction method of the building 1A of the first embodiment, the second column member 20A and the beam member 30 are easily joined by the mechanical joint 50, and the portion between the first column member 10A and the beam member 30 is By pouring concrete on site, the position of the first column member 10A can be adjusted.
In addition, in the mechanical joint 50 in the method for constructing the building 1A of the first embodiment, as shown in FIG. The beam member 30 can be easily joined to 10A.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment, and can be modified as appropriate without departing from the spirit thereof.
In the method for constructing the building 1A of the first embodiment, as shown in FIG. 5, the second column member 20A is installed as part of the work in the first step, and the beam member 30 After joining, the first pillar member 10A is installed between the two second pillar members 20A, 20A as the remaining work of the first step. However, in the present invention, after the first pillar member 10A and the second pillar member 20A are arranged alternately at intervals in the horizontal direction, the beam member 30 is placed on the second pillar member 20A in the second step. May be joined.
Further, as shown in FIG. 10, the mechanical joint 50 of the first embodiment is configured so that the filler G can be filled into all the reinforcing bar joints 34 at once. The structure is not limited, and for example, each reinforcing bar joint 34 may be sequentially filled with the filler G.

<Actions and effects of the first embodiment of the present invention>
In the first embodiment of the present invention, as shown in FIG. 1, the second column member made of PCa is formed at a height higher than the height F1 of the first floor and between the column-beam joint J of the second floor. 20A, a beam member 30 made of PCa (for example, a beam member 30 of one span) is joined by a mechanical joint 50 to construct a column-beam frame 2A. By making the length of the second column member 20A greater than the height F1 of the first floor and less than the height between it and the column-beam joint J of the second floor, it can be manufactured even outside of a large-scale PCa manufacturing factory. The size of the PCa pillar was set as possible, and the weight of the PCa pillar was set so that it could be loaded without a special transport vehicle. Therefore, without using a special large-sized lifting machine, the PCa column members and PCa beam members that constitute the concrete column-beam frame 2A can be lifted, and the concrete building 1A can be constructed in a short period of time.
In addition, instead of constructing a concrete building by assembling one story's worth of PCa columns and one span's worth of PCa beam members as in the conventional technology, the first column member 10A for one story is used as a column member. An RC building 1A is constructed using the second column member 20A, which exceeds the height F1 of the first floor and is formed at a height between the pillar-beam joint J of the second floor. As one of the column members, the second column member 20A of PCa construction, which exceeds the height F1 of the first floor and is formed at a height between the column-beam joint J of the second floor, can be used as one of the column members. There is no need to provide joints to connect the column members for each column, and the construction period can be shortened. In addition, by using the second column member 20A of PCa construction, which exceeds the height F1 of the first floor and is formed at a height between the column and beam joint J of the second floor, as the PCa column member, the PCa column member In addition to reducing the number of joints between column members, construction costs can be reduced.
In addition, the second column member 20A and the beam member 30 made of PCa are embedded in the beam end reinforcement 13 protruding from the column-beam joint J of the first floor of the second column member 20A. By fitting the reinforced reinforcing bar joints 22 and filling the joint between the second column member 20A and the beam member 30 with filler and joining them, it is possible to save labor and shorten the construction period on site. . In addition, by converting all the column-beam joints J into PCa as part of the PCa column members without pouring concrete on-site, it is possible to improve construction accuracy and increase work efficiency on-site.
Further, one end of the second column member 20A and the beam member 30 made of PCa is connected to the second column member 20A made of PCa by a mechanical joint 50, and the other end of the beam member 30 made of PCa is connected at the site. A concrete pouring beam portion 40 is provided and connected to the first column member 10A made of PCa. Therefore, the vertical accuracy of the first column member 10A can be adjusted by joining the beam member 30 made of PCa construction and the first column member 10A made of PCa construction via the on-site concrete placement beam portion 40.
As described above, in the first embodiment of the present invention, compared to the conventional technology, (1) the number of joints of column main reinforcement can be reduced, (2) the number of PCa column members can be reduced, and (3) concrete at the site can be reduced. (4) By increasing the PCa conversion rate of PCa column members and PCa beam members, construction accuracy can be improved. (5) Transportation of PCa column members and PCa beam members. It is possible to increase efficiency and construction stability. Therefore, work efficiency during construction can be improved and construction costs can be reduced.

[ Reference example ]
Next, a building construction method according to a reference example of the present invention will be described.
FIG. 12 is a front view showing a column-beam frame of a building according to a reference example of the present invention. FIG. 13 is a perspective view showing each member in a building according to a reference example of the present invention.
As shown in FIG. 12, the reference example building 1B includes a concrete column-beam frame 2B. As shown in FIG. 13, the column-beam frame 2B includes a third column member 10B and a fourth column member 20B each having a height of two stories, a beam member 30, and an on-site concrete-casting beam portion 40 (FIG. 12).
(see ) and In addition, in FIG. 13, in order to clearly show the structure of each member, the numbers of reinforcing bars and joints are adjusted as appropriate.
The third pillar member 10B or the fourth pillar member 20B of the reference example is formed such that the height from the lower end surface to the upper end surface of each pillar member is a height F2 of two levels. That is, the height to the upper end surface of the third column member 10B or the fourth column member 20B of the reference example is set to the height between the column-beam joint J of the second floor at one or more floors. In this way, the third pillar member 10B and the fourth pillar member 20B of the reference example are formed at the same height.

Next, a method for constructing the building 1B as a reference example will be described with reference to the flowchart in FIG. 14.
Note that the same steps as in the building 1A (see FIG. 1) of the first embodiment will be omitted as appropriate from description.
FIG. 15 is a front view showing a state in which a beam member is joined to a fourth column member in a building construction method according to a reference example of the present invention. FIG. 16 is a front view showing a state in which a third pillar member and a beam member are joined in a building construction method according to a reference example of the present invention.
In step S21 (the "first step" in the claims), as shown in FIG. 15, the third pillar member 10B and the fourth pillar member 20B are installed alternately at intervals in the horizontal direction. In the reference example , one fourth pillar member 20B is installed between third pillar members 10B, 10B installed every two spans.
In step S22 (the "second step" in the claims), the beam member 30 is lifted and placed between the third pillar member 10B and the fourth pillar member 20B using a lifting machine, and the beam member 30 is horizontally moved. By moving, as shown in FIG. 16, the beam member 30 is joined to the column-beam joint J of the first floor and the column-beam joint J of the second floor of the fourth column member 20B by the mechanical joint 50, respectively. The structure of the mechanical joint 50 of the reference example is the same as the mechanical joint 50 of the first embodiment (see FIGS. 10 and 11), and all reinforcing bar joints 34 are filled with a filler material. The fourth pillar member 20B and the beam member 30 are joined by a mechanical joint 50.

In step S23 (the "third step" in the claims), the space between the third column member 10B and the beam member 30 is surrounded by a formwork, and concrete is poured into the formwork. The three-column member 10B and the beam member 30 are joined by the on-site concrete placement beam portion 40.
Thereby, a two-story column-beam frame 2B can be constructed using the third column member 10B, the fourth column member 20B, the beam member 30, and the on-site concrete placement beam section 40.
In step S24 (the "fourth step" in the claims), as shown in FIG. 12, another third pillar member 10B is joined to the upper end of the third pillar member 10B, and at the same time Another fourth pillar member 20B is joined to the upper end.
In step S25 (the "fifth step" in the claims), the second step (step S22) to the fourth step (step S24) are repeated, and the third pillar member 10B, the fourth pillar member 20B, The building 1B having the column-beam frame 2B is constructed by stacking up the levels of the beam members 30 and the on-site concrete-cast beam parts 40.

As shown in FIG. 12, the method for constructing the building 1B of the reference example described above does not require the use of a special and large lifting machine, similar to the method of constructing the building 1A of the first embodiment (see FIG. 1). It is also possible to construct concrete buildings in a short period of time. Therefore, the effects of the first embodiment can also be obtained with the method of constructing the building 1B of the reference example .
In particular, in the construction method of the building 1B of the reference example , the third pillar member 10B and the fourth pillar member 20B are PCa-built pillar members formed to a height of two stories, and the first pillar member of the first embodiment Compared to the member 10A and the second column member 20A, the number of column members and the number of joints between column main reinforcements are further reduced, so it is possible to shorten the construction period or reduce construction costs.
Furthermore, in the method for constructing the building 1B of the reference example , the position of the third column member 10B can be adjusted, similarly to the method for constructing the building 1A of the first embodiment (see FIG. 1).

Although reference examples of the present invention have been described above, the present invention is not limited to the reference examples , and can be modified as appropriate without departing from the spirit, similar to the first embodiment.
In the construction method of the building 1B of the reference example , as shown in FIG. 15, after the third pillar member 10B and the fourth pillar member 20B are installed alternately in the first step, the fourth pillar member 20B is installed in the second step. The beam members 30 are joined. However, in the present invention, only the fourth column members 20B are installed every two spans as part of the work in the first step, and after joining the beam members 30 to the fourth column members 20B in the second step, As a remaining work in one step, the third pillar member 10B may be installed on the side of the fourth pillar member 20B.
In addition, in the first embodiment described above, a vertical member made of PCa having a height of 1.5 stories F1.5 was used as the second column member, but the height is not limited to 1.5 stories. It is sufficient if the second column member of the PCa structure is higher than the height of the first floor and is formed at the height between the column and beam joint of the second floor, and the vertical height of the PCa structure with the height of the second floor is sufficient. It can also be a component. Therefore, the column-beam frame is composed of a first column member 10A with a height of one story, a second column member 20A with a height of two stories, a beam member 30, and an on-site concrete-cast beam part 40. . Since the first column member 10A and the second column member 20A are each provided with a column-beam joint on each floor, the first column member 10A and the second column member 20A connected to the column-beam joint are , the beam member, and the on-site concrete placement beam portion 40 can be easily joined to the floor slab.

1A Building (first embodiment)
1B Building ( reference example )
2A Column beam frame (first embodiment)
2B Column beam frame ( reference example )
5 reinforcing bars 6 formwork 10A first column member (first embodiment)
10B Third pillar member ( reference example )
11 Column end reinforcement 12 Reinforcement joint 13 Beam end reinforcement 20A Second column member (first embodiment)
20B Fourth pillar member ( reference example )
21 Column end reinforcement 22 Rebar joint 23 Beam end reinforcement 30 Beam member 31 First end 32 Second end 33 Beam end reinforcement 34 Reinforcement joint 35 Hole 35a Inclined portion 35b Cover member 35c Inlet 36 Gap 38 Main reinforcement 40 On-site concrete pouring beam 50 Mechanical joint G Filler J Column-beam joint

Claims (2)

A method of constructing a concrete building,
A first column made of precast concrete with a height of one story and a second column made of precast concrete that is integrally formed so as to exceed the height of the first story including the column-beam joint, in the horizontal direction. A first step of installing alternately at intervals, or installing only the second pillar member in advance every two spans;
A precast concrete beam member with a reinforcing bar joint embedded therein is moved horizontally to the beam end reinforcement protruding from the side surface of the column-beam joint on the first floor of the second column member, and the beam a second step of fitting and joining the end reinforcement to the reinforcing bar joint;
Concrete is poured between the first column member or the first column member installed after the second step and the beam member, an on-site concrete pouring beam section is provided, and the first column member and the first column member installed after the second step are placed. a third step of joining the beam member;
a fourth step of joining another second pillar member to the upper end of the first pillar member, and joining another first pillar member to the upper end of the second pillar member;
A fifth step of constructing a concrete column-beam frame by repeating the second to fourth steps,
The second column member is a column member that exceeds the height of the first floor and is formed at a height between the lower end surface of the beam member of the second floor, excluding the column-beam joint of the second floor. A method of constructing a concrete building characterized by: In the second step, a gap provided between the column-beam joint and a beam end surface of the beam member is covered with a formwork material, and an injection port provided at the beam end of the beam member is covered with a formwork material. 2. The method of constructing a concrete building according to claim 1 , wherein the filler is injected into all the reinforcing bar joints at once.

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