JP2022037522A - Beam construction method, and beam formwork support structure - Google Patents

Abstract

To make it possible to install a beam formwork before installing concrete of a floor slab.SOLUTION: A beam construction method includes the steps of: bridging a beam formwork receiving beam member 12 between columns 20 while fixing its end portion to the columns 20 disposed so as to neighbor; installing a beam formwork 16 on the beam formwork receiving beam member 12; installing concrete forming a floor slab 54; installing a timbering 56 on the floor slab 54 where the concrete is cured to support the beam formwork 16; and installing concrete into the beam formwork 16 to form a beam 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a beam construction method and a beam formwork support structure.

When constructing the beams of a building with cast-in-place concrete, generally, a support work is installed on the floor slab, and concrete is placed in the beam formwork with the beam formwork supported by this support work. To form a beam (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2-153164

However, with this construction method, the beam formwork can only be installed after the concrete is placed on the floor slab. As a result, the workload of the beam formwork work is concentrated after the concrete placement of the floor slab, and the work efficiency of the building construction as a whole deteriorates.

In view of the above facts, it is an object of the present invention to enable the beam formwork to be installed before the concrete placement of the floor slab.

The method of constructing a beam according to the first aspect is a step of fixing an end portion to columns arranged adjacent to each other and erection of a beam type frame receiving beam member between the columns, and a beam forming a beam on an upper floor. The process of installing the form frame on the beam form receiving beam member, the process of placing concrete to form the floor slab on the lower floor, and the step of installing the support work on the floor slab where the concrete has hardened. It has a step of supporting the beam form and a step of placing concrete in the beam form to form the beam.

According to the beam construction method according to the first aspect, the beam frame receiving beam member is erected between the columns, and the beam frame is installed on the beam frame receiving beam member to install the beam on the upper floor. Since the support work installed on the hardened concrete of the floor slab on the lower floor is not required to install the beam frame to form the beam, install the beam frame before placing the concrete on the floor slab on the lower floor. It will be possible.

As a result, it is possible to reduce the amount of beam formwork work after concrete placement of the floor slab where the amount of work is concentrated, and it is possible to reduce the amount of work on the critical path and shorten the work period.

In addition, by performing beam formwork work before placing concrete on the floor slab, which has a relatively small amount of work, the amount of work can be dispersed and leveling can be achieved with a small number of workers.

In the beam formwork support structure according to the second aspect, a joining member fixed to the side surface of columns arranged adjacent to each other and brackets to be joined to the joining member with bolts are provided at both ends, and the joining members are adjacent to each other. A beam member that is erected between the arranged columns and can support the beam formwork forming the beam on the upper floor, and is arranged between the beam member and the beam formwork, and is more than the beam member. It has a large pulling material that overhangs in a direction intersecting the longitudinal direction of the beam formwork and can be supported by a support work installed on the floor slab on the lower floor.

According to the beam formwork support structure according to the second aspect, the beam member can be erected between the columns only by joining the bracket of the beam member to the joining member fixed to the side surface of the column with bolts. Then, by installing the beam formwork that forms the beam on the upper floor on this beam member, the support work installed on the hardened concrete of the floor slab on the lower floor to install the beam formwork. Is no longer required, and beam formwork can be installed before concrete is placed on the floor slab.

Further, since the beam member may have a structure capable of supporting the load of the beam formwork, the weight and size can be reduced.

Further, the large pulling material arranged between the beam member and the beam formwork projects from the beam member in the direction intersecting the longitudinal direction of the beam formwork. Therefore, the support work can be installed without removing the beam member. This makes it possible to set the removal time of the beam member regardless of the timing of installation of the support work.

The beam formwork support structure according to the third aspect is the beam formwork support structure according to the second aspect, and the beam member can be divided into a plurality of unit members.

According to the beam formwork support structure according to the third aspect, by dividing the beam member into a plurality of unit members, the unit members can be manually transported without using a lifting machine. In addition, the unit member can be transported even in a narrow space.

The beam formwork support structure according to the fourth aspect is the beam formwork support structure according to the second or third aspect, and the beam member is expandable and contractible in the longitudinal direction.

According to the beam formwork support structure according to the fourth aspect, it is possible to support beam formwork of various lengths by adjusting the length of the beam member.

Since the present invention has the above configuration, it is possible to install the beam formwork before placing concrete on the floor slab.

1 (a) to 1 (f) are side views showing a procedure of a beam construction method according to an embodiment. It is a top view which shows the beam member which concerns on one Embodiment. It is a side view which shows the beam member which concerns on one Embodiment. It is a side view which shows the unit member which concerns on one Embodiment. FIG. 4 is a cross-sectional view taken along the line AA of FIG. It is a side view which shows the unit member which concerns on one Embodiment. FIG. 6 is a cross-sectional view taken along the line BB of FIG. It is a side view which shows the bonding state between the unit members which concerns on one Embodiment. FIG. 8 is a cross-sectional view taken along the line CC of FIG. It is a perspective view which shows the joining member which concerns on one Embodiment. It is a side view which shows the state which the end portion of the beam member is fixed to the pillar which concerns on one Embodiment. 11 is a cross-sectional view taken along the line DD of FIG. 13 (a) is a sectional view taken along line EE of FIG. 1 (b), and FIG. 13 (b) is a sectional view taken along line FF of FIG. 1 (d). It is a side view which shows the length adjustment mechanism of the beam member which concerns on one Embodiment. It is a front sectional view which shows the beam formwork support structure which concerns on one Embodiment.

Hereinafter, the beam formwork support structure and the beam construction method according to the embodiment will be described with reference to the drawings.

(Beam formwork support structure)
As shown in the side view of FIG. 1 (b), the beam frame support structure 10 is installed on the beam member 12 as the beam frame receiving beam member and the beam member 12, and the beam 14 on the upper floor ( A large beam 18 supporting the beam form 16 forming (see FIG. 1 (f)), a joining member 22 for fixing the end portion of the beam member 12 to the precast concrete columns 20 arranged adjacent to each other, and a joining member 22. It is configured to have. As shown in the plan view of FIG. 2, two beam members 12 are arranged in parallel at predetermined intervals in a plan view.

As shown in the side views of FIGS. 2 and 3, the beam member 12 is composed of a plurality of unit members 24A and 24B. That is, the beam member 12 can be divided into a plurality of unit members 24A and 24B. A unit member 24A is arranged at the center of the beam member 12, and unit members 24B are arranged on the left and right sides of the unit member 24A.

As shown in the side view of FIG. 4 and FIG. 5 which is a sectional view taken along the line AA of FIG. 4, the unit member 24A includes the upper chord member 26 and the lower chord member 28 arranged above and below, and the upper chord member 26 and the lower chord member. It is configured to have a bundle member 30 that connects the left and right end portions and the central portion of the 28. The upper chord member 26, the lower chord member 28, and the bundle member 30 are made of a square steel pipe.

Brackets 32 made of steel plates are provided at the left and right ends of the upper chord member 26 and the lower chord member 28, and bolt holes 34 are formed in the upper and lower portions of the bracket 32.

As shown in FIG. 7 which is a side view of FIG. 6 and a sectional view taken along the line BB of FIG. 6, the unit member 24B has almost the same configuration as the unit member 24A. Although omitted, a bracket 36 made of a steel plate is provided at one end of the unit member 24B. The length of the bracket 36 is longer than that of the bracket 32 with respect to the longitudinal direction X of the unit member 24B. Bolt holes 34 are formed above and below the bracket 36.

As shown in FIGS. 2, FIG. 3, a side view of FIG. 8, and FIG. 9 which is a sectional view taken along the line CC of FIG. 8, the bracket 32 of the unit member 24A and the bracket 32 of the unit member 24B are overlapped with each other. The unit member 24A and the unit member 24B are connected by aligning the bolt holes 34 formed in the brackets 32 with each other, passing the bolt 38 through these bolt holes 34, and screwing and tightening the bolt 38 into the nut 40. Has been done. In this way, by connecting the plurality of unit members 24A and 24B to form the beam member 12, brackets 36 are provided at both left and right ends of the beam member 12.

As shown in FIG. 10, the joining member 22 is a U-shaped member in a plan view formed by bending a strip-shaped steel plate, and is formed from a rectangular flat plate-shaped support portion 42 and both ends of the support portion 42. It is configured to have a rectangular flat plate-shaped joint portion 44 projecting substantially perpendicular to the plate surface of the support portion 42.

Bolt holes 46 are formed on the left and right sides of the support portion 42, and elongated holes 48 extending in the direction Y in which the joint portion 44 overhangs are formed above and below the joint portion 44.

As shown in FIGS. 2, FIG. 3, a side view of FIG. 11, and FIG. 12 which is a cross-sectional view taken along the line DD of FIG. 11, the joining member 22 is arranged on the side surface of the pillar 20 and is an anchor provided on the pillar 20. The joining member 22 is fixed to the side surface of the pillar 20 by inserting the bolt 50 into the bolt hole 46 (see FIG. 10) of the support portion 42 and screwing and tightening the nut 52 into the anchor bolt 50.

Then, the bracket 36 of the unit member 24B is superposed on the joint portion 44 of the joint member 22, and the elongated hole 48 formed in the joint portion 44 and the bolt hole 34 formed in the bracket 36 (see FIG. 6) are combined. The bracket 36 of the unit member 24B is joined to the joining member 22 by passing the bolt 38 through the elongated hole 48 and the bolt hole 34 and screwing and tightening the bolt 38 into the nut 40.

In this way, as shown in FIG. 1B, the beam member 12 is erected between the columns 20 arranged adjacent to each other, and can support the load of the beam formwork 16.

As shown in FIGS. 1 (b) and 13 (a), which is a cross-sectional view taken along the line EE of FIG. 1 (b), the large pulling material 18 is arranged between the beam member 12 and the beam formwork 16. The beam formwork 16 is supported. Further, the large pulling material 18 projects outward from the beam member 12 in the direction Z intersecting the longitudinal direction of the beam formwork 16, and the overhanging portion 58 is installed on the floor slab 54 on the lower floor. It can be supported by the support work 56 (see FIGS. 1 (d) and 13 (b)).

(Beam construction method)
In the beam construction method according to the present embodiment, as shown in the side views of FIGS. 1 (a) to 1 (f), the upper floor beam is constructed through the first to eighth steps.

First, as shown in FIG. 1A, the precast concrete pillar 20 is built in the first step.

Next, as shown in FIG. 1A, in the second step, the end portion is fixed to the columns 20 arranged adjacent to each other, and the beam member 12 as the beam formwork receiving beam member is formed between the columns 20. Erect.

Next, as shown in FIG. 13 (a), which is a cross-sectional view taken along the line EE of FIGS. 1 (b) and 1 (b), in the third step, the upper beam 14 (FIG. 1 (f)). The beam formwork 16 forming (see) is installed on the beam member 12 via the large pulling material 18. The large pulling material 18 is installed on the beam member 12. The beam formwork 16 is configured to have a bottom formwork 60 and a side formwork 62, and the bottom formwork 60 is installed on a square steel pipe 64 arranged on the large pulling material 18.

Next, as shown in FIG. 1 (c), in the fourth step, concrete is placed to form the floor slab 54 on the lower floor.

Next, as shown in FIGS. 1 (d) and 13 (b), which is a cross-sectional view taken along the line FF of FIG. 1 (d), in the fifth step, the concrete is supported on the hardened floor slab 54. A work 56 is installed, and the support work 56 supports the beam formwork 16 via the large pulling material 18. The support 56 supports the portion 58 of the large pulling member 18 projecting outward from the beam member 12 with respect to the direction Z intersecting the longitudinal direction of the beam formwork 16.

Next, as shown in FIG. 1 (e), the beam member 12 is removed in the sixth step.

Next, as shown in FIG. 1 (e), in the seventh step, the beam 14 is arranged in the beam formwork 16 and concrete is placed in the beam formwork 16.

Next, as shown in FIG. 1 (f), in the eighth step, the support work 56 is removed, the beam formwork 16 is removed, and the beam formwork 16 is removed to form the beam 14. ..

(effect)
Next, the effect of this embodiment will be described.

According to the beam formwork support structure 10 of the present embodiment, as shown in FIG. 11, only by joining the bracket 36 of the beam member 12 to the joining member 22 fixed to the side surface of the column 20 with the bolt 38, the beam member 12 can be erected between the pillars 20. Then, as shown in FIG. 1 (b), by installing the beam formwork 16 forming the beam 14 on the upper floor on the beam member 12, the floor on the lower floor for installing the beam formwork 16 The support work installed on the hardened concrete of the slab 54 becomes unnecessary, and the beam formwork 16 can be installed before the concrete is placed in the floor slab 54.

Further, according to the beam formwork support structure 10 of the present embodiment, as shown in FIG. 1B, the beam member 12 may have a structure capable of supporting the load of the beam formwork 16, so that the beam member 12 may have a structure. The beam member 12 can be made lighter and smaller by reducing the beam formation, reducing the structural cross section, and the like.

Further, according to the beam formwork support structure 10 of the present embodiment, as shown in FIG. 13B, the large pulling material 18 arranged between the beam member 12 and the beam formwork 16 is the beam formwork. It overhangs the beam member 12 in the direction Z intersecting the longitudinal direction of 16, and the overhanging portion 58 is supported by the support work 56 installed on the floor slab 54 on the lower floor. As a result, since the support work 56 can be installed without removing the beam member 12, the removal time of the beam member 12 can be set regardless of the timing of installing the support work 56.

Further, according to the beam formwork support structure 10 of the present embodiment, as shown in FIGS. 3, 4, and 6, a lifting machine is used by dividing the beam member 12 into a plurality of unit members 24A and 24B. The unit members 24A and 24B can be manually transported without the need for human power. Further, the unit members 24A and 24B can be transported even in a narrow space. For example, the unit members 24A and 24B can be transported even in a place where there are many obstacles such as support works installed at intervals of about 600 mm.

Further, according to the beam formwork support structure 10 of the present embodiment, as shown in FIG. 11, by making the bolt hole formed in the joining member 22 an elongated hole 48, the construction error of the column 20, that is, the adjacent column 20 is formed. The beam member 12 can be erected between the columns 20 by absorbing the error of the distance between the columns 20 arranged together.

Further, according to the beam construction method of the present embodiment, as shown in FIG. 1 (b), a beam member 12 as a beam form receiving beam member is erected between the columns 20 and above the beam member 12. By installing the beam form 16 on the floor, the support work installed on the hardened concrete of the floor slab 54 on the lower floor becomes unnecessary in order to install the beam form 16 forming the beam 14 on the upper floor. Therefore, the beam form 16 can be installed before the concrete is placed on the floor slab 54 on the lower floor.

As a result, the amount of beam formwork work after concrete placement of the floor slab 54, where the amount of work is concentrated, can be reduced, the amount of work on the critical path can be reduced, and the work period can be shortened.

Further, by performing the beam formwork work before placing the concrete of the floor slab 54 having a relatively small amount of work, the amount of work can be dispersed and the leveling can be achieved with a small number of workers.

Further, according to the beam construction method of the present embodiment, as shown in FIG. 1 (c), when the concrete is placed on the floor slab 54, the support 56 is not arranged below the beam member 12, so that the concrete is used. It is possible to facilitate concrete placing work such as handling of a placing hose and finishing work of a concrete surface.

(Modification example)
Next, a modified example of the above embodiment will be described.

In the above embodiment, as shown in FIG. 2, an example in which two beam members 12 are arranged in parallel at a predetermined interval in a plan view is shown, but the beam members 12 are arranged at a predetermined interval in a plan view. You may open and arrange three or more in parallel. Further, one beam member having a width sufficient to support the beam form 16 may be arranged.

Further, in the above embodiment, as shown in FIG. 3, an example in which the beam member 12 is composed of three unit members (one unit member 24A and two unit members 24B) is shown, but the beam member 12 is 2 It may be composed of one or more unit members. Further, the beam member 12 may not be divided.

Further, in the above embodiment, as shown in FIG. 3, an example in which the beam formwork receiving beam member is used as the beam member 12, but the beam formwork receiving beam member is erected between adjacent columns 20. Any structure may be used as long as it can support the beam formwork 16.

Further, in the above embodiment, as shown in FIG. 3, an example in which the beam formwork receiving beam member is used as the beam member 12, but the beam member 12 is expandable and contractible in the longitudinal direction of the beam member 12. You may. For example, as shown in the side view of FIG. 14, the length adjusting mechanism 72 may be provided at one end of the unit member 24B. The length adjusting mechanism 72 is provided in the insertion holes 74 and 76 formed of prismatic holes formed at the ends of the upper chord member 26 and the lower chord member 28, and is provided above and below the bracket 36 so as to be slidable in the insertion holes 74 and 76. It is configured to have insertion members 78 and 80 made of square steel pipes to be inserted, and bolts 82 provided so as to be screwable at the ends of the upper chord member 26 and the lower chord member 28. By tightening the bolt 82 at an arbitrary position of the insertion members 78 and 80 inserted into the insertion holes 74 and 76, the insertion members 78 and 80 are fixed to the upper chord member 26 and the lower chord member 28.

Here, an example in which the length adjusting mechanism 72 is provided at one end of the unit member 24B is shown, but the length adjusting mechanism 72 has at least one end of the plurality of unit members 24A and 24B, or both. It may be provided at the end of.

If the beam member 12 is made expandable in the longitudinal direction of the beam member 12 in this way, the beam formwork 16 having various lengths can be supported by adjusting the length of the beam member 12. ..

Further, in the above embodiment, as shown in FIG. 1 (e), an example in which the beam member 12 is removed in the sixth step after installing the support 56 on the floor slab 54 is shown, but the beam member 12 is shown. The removal of the support work 56 may be performed at any time after the support work 56 is installed on the floor slab 54. For example, the beam member 12 may be removed after concrete is placed in the beam formwork 16.

Further, in the above embodiment, as shown in FIG. 13B, the portion 58 of the large pulling member 18 projecting outward from the beam member 12 with respect to the direction Z intersecting the longitudinal direction of the beam formwork 16 is supported. Although the example supported by the work 56 is shown, the central portion 66 of the large pulling member 18 located between the beam members 12 arranged adjacent to each other may be supported by the support work 56.

Further, in the above embodiment, as shown in FIG. 13B, the portion 58 of the large pulling member 18 projecting outward from the beam member 12 with respect to the direction Z intersecting the longitudinal direction of the beam formwork 16 is supported. Although an example of supporting by the work 56 is shown, the beam formwork 16 may be supported by the support work 56 without using the large beam 18 as in the beam formwork support structure 68 shown in FIG. ..

In the beam formwork support structure 68, the beam formwork 16 is configured to have a bottom formwork 60 and a side formwork 62, and a plurality of bottom formwork 60s are arranged in parallel in the longitudinal direction of the beam formwork 16. It is installed on the formwork 70. The beam member 12 supports the crosspiece 70.

Further, in the above embodiment, as shown in FIG. 1A, an example in which the column 20 is made of precast concrete is shown, but it is a column having another structure such as a column made of reinforced concrete formed of cast-in-place concrete. There may be.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate. Of course, it can be carried out in various embodiments as long as it does not deviate.

10 Beam formwork support structure 12 Beam member (beam formwork receiving beam member)
14 Beam 16 Beam formwork 18 Large pulling material 20 Pillar 22 Joining member 24A, 24B Unit member 36 Bracket 38 Bolt 54 Floor slab 56 Supporting work

Claims (4)

The process of fixing the ends to the columns arranged next to each other and erection of the beam formwork receiving beam member between the columns.
The process of installing the beam formwork forming the upper floor beam on the beam formwork receiving beam member, and
The process of placing concrete to form the floor slab on the lower floor and
The process of installing a support on the floor slab where the concrete has hardened to support the beam formwork, and
The process of placing concrete in the beam formwork to form the beam,
How to construct a beam with. Joining members fixed to the sides of columns arranged next to each other,
Brackets to be joined to the joining member with bolts are provided at both ends, and a beam member capable of supporting the beam formwork forming the beam on the upper floor while being erected between the columns arranged adjacent to each other.
It is placed between the beam member and the beam formwork, projects from the beam member in a direction intersecting the longitudinal direction of the beam formwork, and can be supported by a support installed on the floor slab on the lower floor. With a large beam
Beam formwork support structure with. The beam formwork support structure according to claim 2, wherein the beam member can be divided into a plurality of unit members. The beam formwork support structure according to claim 2 or 3, wherein the beam member is expandable and contractible in the longitudinal direction.

Images