JP2650512B2 - PC beam formwork and beam construction method using PC beam formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC beam formwork and a PC
The present invention relates to a method for constructing a beam using a beam formwork.

[0002]

2. Description of the Related Art Conventionally, when constructing RC beams and SRC beams,
Usually, concrete is cast into the inside using a formwork. Conventionally, a plywood panel or the like is used as such a formwork, and concrete is cast therein.
Then, after the concrete is cured, the mold formed of the plywood panel is released, and then the surface is finished. Therefore, when constructing a beam using such a formwork, a scaffold for attaching and detaching the formwork is required, and a great deal of time and labor is required for assembling the scaffold.

In view of the above, conventionally, there has been proposed a suspension scaffold which also serves as a support for a beam form as shown in FIG. That is, this beam form support and suspension scaffold has a structure in which the scaffold 4 is suspended via the suspension bolts 3 on the lower flange 2 a of the steel beam 2 disposed inside the form 1.

[0004]

In such a conventional beam form support and suspension scaffold, the structure including the scaffold 4 can be simplified, but the support of the scaffold 4 does not depend on the steel beam 2. Inevitably, the target beam structure is necessarily an SRC beam, and it cannot be applied to other beam structures, for example, RC beams.

Further, in the above-mentioned beam formwork supporting and hanging scaffold, since a plywood plate is used as a beam formwork, a great deal of labor is required for mounting and removing the beam formwork, and the construction period is lengthened. There were various issues.

In view of the above-mentioned problems, the present invention eliminates the trouble of removing the beam by using a beam formwork made of PC, and greatly simplifies the configuration by using the PC beam formwork itself as a scaffold. The present invention also provides a PC beam formwork that can be applied to a beam structure other than the SRC beam, and a method for constructing a beam using the PC beam formwork.

[0007]

In order to achieve the above object, a PC beam form according to the present invention is formed by forming both ends in the longitudinal direction of a flat PC board so as to be capable of being folded back and forth so as to be extendable and contractible. The PC board is characterized in that both side portions in the width direction of the PC board are formed so as to be folded back so as to form side plates of the horizontal scaffolding and formwork.

[0008] Further, the invention is characterized in that both ends in the longitudinal direction of the PC board are folded back so as to form the bottom of the horizontal scaffolding / form frame.

In order to achieve the above object, a method of constructing a beam using a PC beam formwork according to the present invention is characterized in that both side parts in the width direction can be folded back to form a side plate of a horizontal scaffolding and formwork; A flat-plate PC board whose both ends in the longitudinal direction are freely foldable so as to be expandable and contractible is prepared. First, both side parts in the width direction are folded back in the horizontal direction, and the PC board is folded in a state where both ends in the longitudinal direction are folded downward. Position, and then work with the PC board top surface as a horizontal scaffold, and then fold back both ends in the longitudinal direction in the horizontal direction, and fold both side pieces in the width direction upward to form a PC beam formwork, Finally, concrete is poured into the PC beam formwork.

[0010]

According to the PC beam form of the present invention and the method of constructing a beam using the PC beam form according to the above construction, the longitudinal ends of the flat PC plate are folded downward.
Since the length can be shortened, the PC beam formwork can be freely arranged, and can be easily arranged at a predetermined position. In addition, the PC board upper surface can be used as a wide horizontal scaffold by folding back the both side portions in the width direction of the PC board horizontally. Furthermore, by folding back both ends in the longitudinal direction of the PC board horizontally, both ends in the longitudinal direction can also be used as a horizontal scaffold.

On the other hand, the PC beam formwork having a U-shaped cross section can be formed by folding back both ends in the longitudinal direction of the PC board in the horizontal direction and folding back both side portions in the width direction upward. By casting, the PC beam formwork can be integrated with the cast concrete to form a beam. Therefore, it is not necessary to remove the beam formwork after the completion of the construction of the beam.

Therefore, according to the present invention, since the scaffold can be formed by using the PC beam form itself, there is no need to provide a separate hanging scaffold, and the structure can be remarkably simplified to promote labor saving. In addition, since the PC beam formwork is finally integrated with the cast concrete and its demolding is not required, labor saving and shortening of the construction period can be achieved from this point as well.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 show a PC according to an embodiment of the present invention.
FIG. 1 shows a beam formwork 10 and a method of constructing a beam using the PC beam formwork 10. FIG. 1 is a plan view of the PC beam formwork 10, and FIGS. 2 to 6 are explanatory diagrams sequentially showing the construction method. .

That is, the PC beam formwork 10 of the present embodiment is formed into a thin flat plate having a rectangular planar shape using high-strength concrete or concrete containing reinforcing fibers, mortar, or high-strength mortar. By bending the flat PC beam form 10 into a U-shaped cross section, a target beam form is formed.

The PC beam formwork 10 is built between adjacent columns 12, 12 as shown in FIG. In the horizontal direction of the columns 12, 12, connecting steel beams 14,
The connecting steel beams 14, 14 are fixed to the column steel frames 16, 16 in advance. The column steel frame 1
The outer circumferences of 6 and 16 are surrounded by PC column forms 18 and 18.

[0016] Here, the PC beam formwork 10, the length L which is formed as a rectangular flat plate, and set to approximately equal length as the distance L ₀ between the posts 12 and 12, and the PC
The width W of the beam form 10 is set to the bottom width W _{1 of} the beam to be constructed.
And the height h on both sides are set to dimensions that are respectively combined.

[0017] Then, the PC beam formwork 10 are shown in both longitudinal ends 10a, first bent part 20, 20 can be folded mountain with a predetermined distance L ₁ from the end face in 10a (FIG. 1 in a dashed line ) And the second bent portions 26, 26 (FIG. 1) that can be valley-folded at the boundary between the bottom 22 and the side walls 24, 24.
(Shown by a chain double-dashed line). Here, the dimension L ₂ between the first bent portion 20 and 20, the connecting steel beam 14,1
Set to a length shorter than the distance L ₃ between 4.

The PC beam formwork 1 according to the present embodiment having the above configuration.
0 constructs the beam by the following method. First,
As shown in FIG. 2, the PC beam form 10 is moved from the first bent portions 20, 20 to both ends 10 a, 10 a of the PC beam form 10.
At right angles, that is, bend downward,
With the side wall 24 folded back horizontally, a pair of gantry 30
Place on top of 0.

Next, as shown in FIG. 3, a beam steel frame 32 is set at the center in the width direction of the PC beam form 10 along the longitudinal direction thereof, and the beam main reinforcement 34 is also put together. Then, the stirrup 36 is temporarily assembled. Further, at this stage, the form puller 38 is attached, and the handrails 40 are attached to both ends of the PC beam form 10 in the width direction.

Then, with the front beam steel beam 32, beam main reinforcement 34, stirrup 36, large pulley 38, handrail 40 and the like attached, the PC beam formwork 10 is mounted on a column as shown in FIGS. It is suspended and arranged between the connecting steel beams 14, 14 protruding from 12, 12. The PC beam form 10 is suspended via a lifting machine (not shown). Hanging portions 42, 42 are protruded from upper ends of the beam steel frame 32, and the hanging portions 42, 42 are provided. Hang it by hanging a wire on it.

Next, the PC beam formwork 10 disposed between the connecting steel beams 14, 14, both ends 10a, 10a of which the mountain is folded from the first bent portion 20, is folded back again and arranged horizontally. . The PC beam form 10 has both ends 10a, 1a.
In a state where 0a is arranged horizontally, it is arranged over almost the entire length between the columns 12, 12. By the way, when the both ends 10a, 10a are folded back,
The ends of a and 10a are locked and fixed to the upper ends of the PC column forms 18 and 18, respectively. The ends 10a, 10a can be fixed by using the U-bolt 47 or other locking metal fittings or supports without using the PC column forms 18, 18.
It can also be fixed to the 2 and 12 sides.

Accordingly, by using the entire PC beam form 10 including the both ends 10a, 10a in the longitudinal direction and the side walls 24, 24 as a scaffold, an operator rides on the PC beam form 10 and Connect steel beams 32, 14
Work to join. This joining operation is performed via connecting plates 44 and 46 that are bolted or riveted over the steel beam 32 and the connecting steel beams 14 and 14. Then, after the joining operation of the beam steel frames 32 is completed, the beam main reinforcement 34 and the stirrup 36 are arranged and fixed at predetermined positions.

Next, the PC beam form 10 is attached to the handrail 4
After removing the second bent portion 2 as shown in FIG.
Fold the valley from 6, 26 and raise both side walls 24, 24,
The side walls 24, 24 and the bottom 22 are assembled into a U-shaped cross section. Therefore, the P thus assembled in a U-shaped cross section is
Inside the C beam formwork 10, the beam steel beam 32 and the connecting steel beam 1
4 and 14, the beam main reinforcement 34, and the stirrup 36 are arranged. In this state, concrete is poured into the PC beam formwork 10. When the poured concrete is hardened, the PC beam formwork 10 forms a beam in a state of being integrated with the concrete. In addition, concrete is poured into the PC column formwork 18 simultaneously with the PC beam formwork 10, and the beam and the column are combined as an integral structure.

With the above configuration, the PC beam formwork 1 of this embodiment is constructed.
0 and the method of constructing a beam using the PC beam formwork 10, the first and second ends 10 a, 10 a of the PC beam formwork 10
The first bent portions 20 and 2 are formed by forming the bent portions 20 and 20.
The length L ₂ between 0 and the distance L between the connecting steel beams 14, 14
Since the number is set to be less than ₃ , both ends 10a, 10a
Can be freely passed between the connecting steel beams 14, 14 in a state in which is folded downward from the first bent portions 20, 20. Therefore, the PC beam formwork 10 can easily pass between the connecting steel beams 14, 14 with the total length L substantially equal to the distance between the pair of columns 12, 12, and can be easily arranged at a predetermined position. Can be done.

After the PC beam form 10 is set in a predetermined position, the both ends 10a, 10a are folded back in the horizontal direction and fixed, so that the PC beam form 10 is brought into a pair of adjacent columns 12, Can be spread over twelve. Accordingly, the scaffold area of the PC beam formwork 10, which is also used as a scaffold, can be secured with a sufficient area for joining the beam steel frames 32, and this joining operation can be performed safely. Furthermore, since the PC beam formwork 10 itself is used as a scaffold as described above, it is not necessary to separately provide a hanging scaffold, and the configuration can be significantly simplified, and labor saving can be promoted.

Next, the PC beam form 10 is connected to the beam steel frame 3.
After the joining of 2, the PC beam formwork 10 is formed into a U-shaped section by valley folding from the second bent portions 26, 26, and concrete is cast therein. The beam can be constructed integrally. Therefore, there is no need to remove the PC beam formwork 10 after the completion of the construction of the beam, and it is possible to save labor from this point as well.

Incidentally, the PC beam formwork 10 of the present embodiment described above.
Has disclosed a case in which the present invention is applied to an SRC beam using the beam steel frame 32 and the connecting steel beam 14, but it goes without saying that the present invention can be applied to other beam structures, for example, RC beams.

[0028]

As described above, in the present invention,
By folding back both ends in the longitudinal direction of the flat PC board, the length can be shortened, and the PC beam formwork can be freely arranged and easily arranged at a predetermined position. Can be.

Further, by folding back both ends of the PC board in the longitudinal direction and both side parts in the width direction, the upper surface of the PC board can be used as a wide horizontal scaffold. By using the PC beam form itself as a scaffold, there is no need to separately provide a hanging scaffold, and the configuration can be significantly simplified, and the number of components can be greatly reduced.
Significant labor savings can be achieved for the assembly and installation.

Further, the PC beam formwork having a U-shaped cross section can be formed by folding back both ends in the longitudinal direction of the PC board in the horizontal direction and folding back both side portions in the width direction upward. By casting the beam, the PC beam formwork can be integrated with the cast concrete to form the beam, so there is no need to remove the beam formwork after the completion of the beam construction. Also, various excellent effects such as significant labor saving and shortening of the construction period can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a PC beam form according to an embodiment of the present invention in an unfolded state.

FIG. 2 is a front view showing a state where both longitudinal ends of the PC beam formwork according to the present invention are mountain-folded.

FIG. 3 is a front view showing a state in which the PC beam formwork according to the present invention is attached to a beam steel frame by bending both ends in the longitudinal direction of the beam frame.

FIG. 4 is a front view showing a state in which a PC beam formwork according to the present invention is installed between columns.

FIG. 5 is a plan view showing a state in which a PC beam formwork according to the present invention is installed between columns.

FIG. 6 is a sectional view showing a state in which the PC beam formwork according to the present invention is assembled in a U-shaped section.

FIG. 7 is a cross-sectional view showing a conventional construction method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 PC beam form 10a Longitudinal end 12 Column 14 Connection steel beam 16 Column steel 18 PC column form 20 First bent part 22 Bottom 24 Side wall 26 Second bent part 30 Mount 32 Beam steel 34 Main beam 36 Star Wrap 40 Handrail

Claims (3)

(57) [Claims] 1. A flat PC board having both ends in the longitudinal direction formed so as to be able to be folded back and forth so as to be able to expand and contract, and between the both ends in the longitudinal direction, both side parts in the width direction of the PC board are connected to a horizontal scaffolding and formwork. A PC beam formwork characterized by being formed so as to be able to be folded back to form a side plate. 2. The PC beam formwork according to claim 1, wherein both ends of the PC board in the longitudinal direction are turned back so as to form a bottom of the horizontal scaffolding and formwork. 3. A flat PC board is manufactured in which both side portions in the width direction can be folded back and both ends in the longitudinal direction can be folded back and forth so as to form a side plate of the horizontal scaffolding / form frame. The PC board is placed at a predetermined position in a state where both side pieces are folded back in the horizontal direction, and both ends in the longitudinal direction are folded down, and then the work is performed using the upper surface of the PC board as a horizontal scaffold. The PC is characterized in that the PC part is folded back in the horizontal direction and the side parts in the width direction are folded upward to form a PC beam formwork, and finally concrete is poured into the PC beam formwork. Construction method of beam using beam formwork.