JPH04261934A - Building frame construction method using form member made of pre-cast concrete - Google Patents

Abstract

PURPOSE:To construct a reinforced concrete building high in quality. CONSTITUTION:The columnar main reinforcements 34 of a block body 3O are inserted into the hollow section S of a precast columnar form member 10 so as to be piled up together with sliced reinforcements 14. In addition, the connecting beam main reinforcements 36 of the block body 30 are piled up together with beam reinforcements 18 and 22 which are projected out of a precast beam form member 12, and the outside of the aforesaid piled-up section is covered with a steel plate form 38. Concrete is then injected into the inside of the hollow section S with pressure from an injection port located at the lower section of the precast columnar form member 10, and concrete is concurrently placed in the precast beam form member 12 and steel plate form 38.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to precast concrete column formwork members, precast concrete beam formwork members, and precast concrete column/beam joint blocks that are constructed using precast concrete column formwork members and precast concrete beam formwork members. The present invention relates to a method of constructing a frame using formwork members.

0002

[Prior Art] Conventionally, when constructing a reinforced concrete building, the pre-assembled column reinforcing bars for column construction were first attached to the construction site, a column formwork was set to cover the column reinforcing bars, and then the column Concrete is poured to construct columns, and in the second half, precast beam members are placed so as to span between the constructed columns, beam reinforcing bars are installed inside these beam members, and then beam concrete is placed. I was about to start pouring. The building was then constructed by performing such work on each floor. Especially,
Gas pressure welding was generally used to connect the column reinforcing bars on the lower floor and the column reinforcing bars on the upper floor in the panel zone, and to join the horizontally intersecting beam reinforcing bars.

0003

[Problems to be Solved by the Invention] However, in this conventional construction method, various types of reinforcing bars are joined together by pressure welding, so a plurality of reinforcing bars must be pressure welded one by one, and this pressure welding work requires a lot of effort. This lengthened the construction period, and the use of open flames posed safety concerns. In addition, this pressure welding process requires skill, and since pressure welding cannot be performed in the rain, the welding process is affected by the weather, which also lengthens the construction period.

[0004] Furthermore, since a formwork such as a plywood board is used, waste materials are generated and formwork work is also required.

Furthermore, when constructing columns, since concrete is poured into the column formwork from above, it is difficult to pour concrete evenly from the bottom to the top of the column, and junkers may form inside the column. However, there was a problem in that the strength decreased. On the other hand, in view of this point, it is conceivable to construct the column members with solid precast concrete members to ensure quality, but this is not preferable because it requires a large lifting machine etc. for on-site construction.

[0006] In view of such conventional problems, the present invention aims to provide a method of constructing a frame using precast concrete formwork members, which can efficiently construct a high-quality reinforced concrete building. shall be.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention is formed into a hollow cylindrical body, in which splice reinforcements and hoop reinforcements are embedded in the thick part, and a concrete injection port is formed in the lower end. precast concrete column formwork members, and precast concrete beam formworks with a U-shaped cross section that is open at the top, and where beam main reinforcements that protrude toward the column/beam joint are buried in the thick part. member, a column main reinforcement inserted into the hollow part of the column formwork member, and the U of the beam formwork member.
A precast concrete column/beam joint block body having a connecting beam main reinforcement inserted into the groove is manufactured in advance,
Next, the column form frame member is built over the existing column main reinforcement, and then the block body is inserted into the hollow part of the column form frame member so that the column main reinforcement butts against the existing column main reinforcement. while placing it on the top of the column frame member, and then
The beam form member is arranged on the side of the block body, with the main beam reinforcement overlapping the connecting beam main reinforcement, and then the sacrificial formwork is arranged between the beam form member and the block body. Then, concrete is press-fitted into the hollow portion of the column formwork member through the injection port thereof, and concrete is poured into the beam formwork member and the sacrificial formwork.

[0008] The present invention also provides that the precast concrete column/beam joint block body includes a steel frame material inserted into the U-shaped groove of the beam form member in place of the connecting beam main reinforcement. It is characterized by

Further, the present invention is characterized in that the above-mentioned disposable formwork is formed of a steel plate material.

0010

[Function] Describing the function of the present invention, precast concrete formwork members and precast concrete formwork members can be used as structural materials for columns, beams, and pillar/beam joints that make up reinforced concrete buildings. Since these units are pre-produced in a factory and transported to the construction site for construction work, construction can be carried out efficiently. In particular, unlike when constructing a formwork using plywood, no waste material is generated and there is no need for formwork, so resource and labor savings can be achieved, and demolding work can be omitted. You can also do it. In addition, large-sized column formwork members and beam formwork members are almost semi-precast and lightweight, so there is no need for large-capacity lifting equipment when transporting and erecting these members at the construction site. .

[0011] Also, regarding the connection of the reinforcing bars to each other, for the main column reinforcements, the splice reinforcements are embedded in the column form frame members and the splint reinforcements and the main column reinforcements form a lap joint structure. Stress transmission between the pillars can be achieved by this lap joint structure, and therefore the joints between these column main reinforcements can be made into a mere butt structure. With this configuration, the number of press-welded parts can be reduced and construction can be completed efficiently and in a short period of time. In addition, it is safer because the number of places where fire is used can be reduced, and it is less affected by the weather.

[0012] Furthermore, when pouring concrete into the column formwork members, the concrete is press-fitted from the injection hole formed at the lower end of the column formwork members, so that the concrete is evenly poured into the hollow parts of the column formwork members. It is possible to prevent the formation of junkers and ensure sufficient strength as a structural material.

Furthermore, the building constructed according to the present invention has a so-called rigid-frame structure, and in this case, short-term stresses such as those caused by earthquakes are largely applied to both ends of the beam. Since we adopted steel frame materials for the connections,
Excellent yield strength can be exhibited against such short-term stress.

[0014] Furthermore, by using a disposable formwork as the formwork to be placed between the block body and the beam formwork member, demolding work can be abolished and construction efficiency can be improved, and in particular, Since a steel plate material is used as the sacrificial formwork, the above-mentioned short-term stress and, as a result, the structural strength can be made sufficiently strong.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. That is, FIGS. 1 to 5 show an example of the method for constructing a frame according to the present invention, FIG. 1 is an explanatory diagram showing the construction process according to the present invention, and FIG. 2 shows a state of connection between columns and beam joints. 3 is an enlarged sectional view taken from line B-B in FIG. 1, FIG. 4 is an enlarged sectional view taken from line AA in FIG. 1, and FIG. 5 is an enlarged perspective view of the column and beam joints. It is.

FIG. 1 shows precast concrete (hereinafter referred to as
It is abbreviated as PC. ) The construction process of the column formwork member 10, the PC beam formwork member 12, and the PC column/beam joint block body 30 is shown. The PC column frame member 10 is shown in FIG.
As shown in FIG. 3, for example, a hollow cylinder with a rectangular cross section is manufactured by centrifugal molding, and within its wall thickness are a plurality of splints 14 arranged in the length direction, and a plurality of splints 14 disposed in the length direction. A plurality of hoop muscles 16 are embedded around the outside of the hoop 14 and arranged at equal intervals in the length direction. In addition, a concrete injection port 1 is provided on the lower side of the PC column form member 10.
7 is formed.

Furthermore, the PC beam form member 12 is manufactured using, for example, a centrifugal forming form apparatus. As shown in Fig. 4, this PC beam form member 12 is formed into a U-shaped cross section with an open upper part, and its length is made shorter than the span between the pair of columns to be spanned. . A plurality of lower beam main reinforcements 18 are buried in the length direction within the wall thickness of the PC beam form member 12, and a plurality of stirrups 20 are partially protruded upward from the thick wall portion at their upper ends. and bury it. Further, on the upper side of the PC beam form member 12, an upper beam main reinforcement 2 is provided in contact with the inner side of the stirrup 20.
2, and these upper beam main reinforcements 22 and lower beam main reinforcements 1
8 project from both ends of the PC beam form member 12. Incidentally, the upper beam main reinforcing bars 22 may be attached at the site after the PC beam form member 12 is formed.

The PC column frame member 10 and the PC beam frame member 12 are manufactured in advance at a factory or the like, and then transported to the site and suspended using a crane or the like to be erected. First, the PC column form frame member 10 is erected. At this erecting position, a plurality of column main reinforcements 26 are erected from the floor slab 24. The column frame member 10 is erected. The length of the column main reinforcing bars 26 erected from the floor slab 24 is approximately half the length of the PC column frame member 10. In addition, the P
As is generally done when constructing the C column form member 10, the PC column form member 10 is used as a supporting member such as a shoring (not shown) until the final concrete pouring process is completed and the concrete hardens. is maintained by

Furthermore, as shown in FIG. 5, the block body 30 includes a plurality of column main reinforcements 34 that protrude vertically from the concrete block 32 and are inserted into the hollow portion S of the PC column form member 10, and a beam. It is constructed by driving a plurality of connection beam main reinforcements 36 that protrude in the arrangement direction and are inserted into the U-shaped groove of the PC beam form member 12. This block body 30 is also manufactured in advance at a factory or the like.

Then, the block body 30 is suspended by a crane or the like, and the lower part 34a of the column main reinforcement 34 is inserted into the hollow part S of the PC column form member 10 from above, and this column main reinforcement lower part 34a and the PC Splinter reinforcement 1 embedded in column formwork member 10
The block body 30 is placed on the top of the PC column frame member 10 so that the blocks 4 and 4 overlap each other. In addition, the column main reinforcement 34
The protrusion amounts of the lower part 34a and the upper part 34b are respectively P
It is formed to have half the length of the column form frame member 10 made of C, and when the column main reinforcement lower part 34a is inserted into the hollow part S, the column main reinforcement lower part 34a is connected to the column main reinforcement 2 that is erected from the floor slab 24.
It is placed in butt relation with 6.

On the other hand, the PC beam form member 12 is placed between the pair of PC column form members 10, and is placed on the side of the block body 30 using the shoring H. At this time, a gap L is provided between the PC beam form member 12 and the PC column form member 10, and this gap L includes the upper and lower beam main bars 22 protruding from the PC beam form member 12. , 18 are exposed. Incidentally, each of the beam main reinforcements 22 and 18 protruding from the PC beam form member 12 has a spiral reinforcement 28 wound around them, and when this PC beam form member 12 is installed, this spiral The reinforcements 28 are bundled at the base side of each of the protruding beam main reinforcements 22, 18.

When installing such a PC beam formwork member 12, the connection beam main reinforcement 36 of the block body 30 is
are superimposed on the lower and upper beam main reinforcements 18 and 22 protruding from the PC beam member 12, and at the stage where the connecting beam main reinforcements 36 and the beam main reinforcements 18 and 22 are superposed in this way, the spiral reinforcements 28
is stretched to almost uniformly cover the entire polymerized area. Then, a steel plate formwork 38 is installed as a waste formwork along the outer shape of the PC beam form member 12 on the outside of this overlapping portion between the PC beam form member 12 and the block body 30. .

[0023] In this way, the PC column frame member 10, PC
With the beam formwork member 12, PC block body 30, and steel plate formwork 38 installed, a concrete pump (not shown) is connected to the injection port 17 formed at the lower end of the PC column formwork member 10. Concrete is injected into the hollow part S of the PC column form member 10 through the injection port 17 by press-fitting. Also,
Concrete is poured into the PC beam form member 12 and the steel plate form 38 from the upper opening.

Therefore, as the concrete poured into the PC column form member 10 hardens, the column main reinforcement lower part 34a and the splint reinforcement 14 overlap each other and form a lap joint, and similarly, the splint reinforcement 14 and the column main reinforcing bars 26 erected from the floor slab 24 constitute a lap joint. Therefore, the column main reinforcement 26 and the column main reinforcement lower part 34a can be firmly connected via lap joints.

On the other hand, as the concrete poured into the steel plate formwork 38 hardens, the lower and upper beam main reinforcements 18 and 22 and the connecting beam main reinforcement 36, which overlap with each other, form a lap joint, and the PC which becomes the beam 40 is formed. The connection between the beam form member 12 and the block body 30 is strengthened, and in turn, the beam 40 can be reliably connected to the PC column form member 10 that becomes the column 50. Thereafter, a formwork for the floor slab 24 is laid, slab reinforcement is placed, and slab concrete is placed on top of it. Therefore, the upper part 34b of the column main reinforcement 34 of the block body 30
will be erected from the floor slab 24, and this column main reinforcement 3
By covering 4b with the PC column frame member 10, the columns of the upper floor are built. Then, by carrying out each of the above steps, the upper floors can be constructed in sequence.

Therefore, in this embodiment, the precast concrete formwork members 10, which can be used as structural members as they are, are used as members that make up columns, beams, and column/beam joints that make up a reinforced concrete building. 12 and precast concrete units 30 are manufactured in advance at a factory, and these can be transported to the construction site for construction work, so construction can be carried out efficiently. In particular, unlike when constructing a formwork using plywood, no waste material is generated and there is no need for formwork, so resource and labor savings can be achieved, and demolding work can be omitted. You can also do it. In addition, since the column formwork members 10 and the beam formwork members 12, which have large external dimensions, are almost semi-precast members and are lightweight, a large-capacity lifting machine or the like is required when transporting and erecting these members at the construction site. Nor.

[0027] Also, regarding the mutual connection of reinforcing bars, for the column main reinforcements 34, splice reinforcements 14 are embedded in the column form frame member 10, and the splint reinforcements 14 and the column main reinforcements 34 constitute a lap joint structure. Therefore, the stress transmission between the column main reinforcements 26 and 34 can be achieved by this lap joint structure, and therefore the connection between the column main reinforcements 26 and 34 can be made into a mere butt structure. With this configuration, the number of press-welded parts can be reduced and construction can be completed efficiently and in a short period of time. In addition, it is safer because the number of places where fire is used can be reduced, and it is less affected by the weather.

Concrete is poured into the column form member 10 through an injection port 17 formed at the lower end of the column form member 10.
Since the concrete is press-fitted from the column frame member 10, the hollow part S of the column formwork member 10 can be evenly filled with concrete, and the formation of junkers can be prevented and sufficient strength as a structural material can be ensured. .

Furthermore, since the formwork to be disposed between the block body 30 and the beam formwork member 12 is a waste formwork, demolding work can be abolished and construction efficiency can be improved.
In particular, since a steel plate material is used as the sacrificial formwork, the above-mentioned short-term stress and, as a result, the structural strength can be made sufficiently strong.

By the way, the block body 30 has been disclosed as being formed as a reinforced concrete block using rod-shaped reinforcing bars as the connecting beam main reinforcements 36, but the present invention is not limited to this, and as shown in FIG. Those formed as reinforced concrete blocks can be used. In this way, the building constructed according to this embodiment has a so-called rigid-frame structure, and short-term stresses such as those caused by earthquakes are largely applied to both ends of the beam 40.
Since the steel frame material 42 is used to connect both ends of the block body 30 to the block body 30, it is possible to exhibit excellent resistance against such short-term stress.

[0031]

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects. (1) Columns, beams, and members constituting the column/beam joints that make up a reinforced concrete building are manufactured in advance in a factory as precast concrete formwork members and precast concrete units that can be used as structural materials as they are. Since these items can be transported to the construction site and construction work can be carried out, construction can be carried out efficiently. In particular, unlike when constructing formwork with plywood, no waste material is generated, and no formwork is required.
Resource and labor savings can be achieved, and demolding work can also be omitted. In addition, large-sized column formwork members and beam formwork members are almost semi-precast and lightweight, so there is no need for large-capacity lifting equipment when transporting and erecting these members at the construction site. . (2) Also, regarding the connection of reinforcing bars to each other, for the main column reinforcements, we have embedded splint reinforcements in the column form frame members and configured a lap joint structure with the splint reinforcements and the main column reinforcements. Stress transmission between the pillars can be achieved by this lap joint structure, and therefore the joints between these column main reinforcements can be made into a mere butt structure. With this configuration, the number of press-welded parts can be reduced and construction can be completed efficiently and in a short period of time. In addition, it is safer because the number of places where fire is used can be reduced, and it is less affected by the weather. (3) In addition, when pouring concrete into the column formwork, the concrete is press-fitted through the injection hole formed at the bottom end of the column formwork, so that the concrete is evenly poured into the hollow part of the column formwork. It is possible to prevent the formation of junkers and ensure sufficient strength as a structural material. (4) Furthermore, the building constructed according to the present invention is a so-called rigid-frame structure, and in this case, short-term stress such as an earthquake will be applied to both ends of the beam, but the structure between both ends of the beam and the block body will be large. Since steel frames are used for the connections, it can exhibit excellent resistance to such short-term stress. (5) In addition, since the formwork to be installed between the block body and the beam formwork member is a waste formwork, it is possible to eliminate demolding work and improve construction efficiency. Since a steel plate material is used as the formwork, the above-mentioned short-term stress and, as a result, the structural strength can be made sufficiently strong.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the process of the present invention.

FIG. 2 is an enlarged sectional view showing a connection state between a column frame member and a block body in the present invention.

3 is an enlarged sectional view taken along line BB in FIG. 1. FIG.

4 is an enlarged sectional view taken along line AA in FIG. 1. FIG.

FIG. 5 is an enlarged perspective view of a block body used in the present invention.

FIG. 6 is a front view of a block body showing another embodiment of the present invention.

[Explanation of symbols]

10 Precast concrete column formwork member 12
Precast concrete beam formwork member 14 Splice reinforcement
17 Inlet 18 Lower beam main reinforcement
20 Stirrup 22 Upper beam main reinforcement
24 Floor slab 26 Column main reinforcement
30 Block body 34 Column main reinforcement
34a Lower column main reinforcement 34b Upper column main reinforcement
36 Connecting beam main reinforcement

Claims (3)

[Claims] Claim 1: A precast concrete column formwork member formed into a hollow cylindrical shape, with splint reinforcements and hoop reinforcements embedded in the thick wall part, and a concrete injection port formed in the lower end, and an open upper part. It is formed into a U-shaped cross section,
A precast concrete beam formwork member in which the main beam reinforcement that protrudes to the column/beam joint part is buried in the thick part, and the main column reinforcement and the beam formwork member that are inserted into the hollow part of the column formwork member. A precast concrete column/beam joint block body having a connecting beam main reinforcement to be inserted into the U-shaped groove is manufactured in advance, and then the column form frame member is erected by covering the existing column main reinforcement, and then, The block body is inserted into the hollow part of the column form member so that its main column reinforcement butts against the existing column main reinforcement, and is placed on top of the column form member, and then the block body is placed on top of the column form member. Laterally, the beam form member is arranged while superimposing the beam main reinforcement on the connecting beam main reinforcement, and then a sacrificial form is arranged between the beam form member and the block body,
Thereafter, concrete is press-fitted into the hollow part of the column formwork member through the injection port, and concrete is poured into the beam formwork member and the sacrificial formwork. The framework construction method used. [Claim 2] The above precast concrete pillar/
The precast concrete formwork according to claim 1, wherein the beam joint block body includes a steel frame material inserted into the U-shaped groove of the beam formwork member in place of the connection beam main reinforcement. A method of building a frame using members. 3. The method of constructing a frame using a precast concrete formwork member according to claim 1 or 2, wherein the sacrificial formwork is made of a steel plate material.