JPS628574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in construction methods for structures such as concrete walls.

Conventionally, when constructing reinforced concrete structures, the method used is to install reinforcing bars, then set formwork on both sides and pour concrete. When assembling reinforcing bars for a structure with a considerable height, such as the following, a scaffold is set up to assemble the reinforcing bars, the reinforcing bars are assembled using this scaffolding, and when the work is completed, the scaffolding is removed, and then Formwork for pouring concrete is being installed.

The above-mentioned scaffolding is constructed simply by assembling reinforcing bars, but it still requires full-scale scaffolding, which requires a lot of equipment, and requires a great deal of labor and expense to install and remove the scaffolding. It had become necessary to

The present invention aims to eliminate the drawbacks of the conventional method as described above, and when constructing a concrete structure, first a formwork used for pouring concrete is installed, and this formwork is used to create a concrete structure. By installing scaffolding and assembling the reinforcing bars, it is possible to simplify the special scaffolding facilities for assembling the reinforcing bars, reduce the labor and expense required to install and remove the scaffolding, and make the construction more efficient and cost-effective. It is an attempt to make it possible to carry out
This method is especially suitable for constructing thin structures.

Embodiments of the present invention will be specifically described below with reference to the drawings.

Figures 1 to 4 are side views showing the construction procedure for constructing a concrete wall;
Figure 3 is a plan view of Figure 1, where 1 is the base, A
and B are a pair of formworks installed oppositely on the base 1, respectively.

One formwork A is a stationary type, for example, as shown in the figure, vertical butterflies 2, 2 are erected at a required interval,
Connect these with horizontal flaps (not shown), and
It has a conventionally known configuration in which a weir plate 3 is constructed and held by braces 4. Further, the formwork B on the other side has a movable structure as shown in the figure. That is, the formwork B includes a frame 7 having a triangular side surface and provided with running wheels 6 having a lifting device 5.
4 are arranged at required intervals in the length direction, and connecting members such as horizontal flaps (not shown) and weir plates 3 are constructed on these frames 7.

In construction, first, as shown in FIG. 1, one formwork A is installed at a predetermined construction position for pouring concrete and is held by braces 4.
The formwork B on the other side is the wall surface 14' of the wall body 14 to be constructed.
Install them at wider intervals as required.
In other words, a gap is provided between the weir plate 3 of the formwork B and the wall surface 14' that is wide enough to accommodate the scaffolding C.

After completing the installation of formwork, next, both formwork A,
The supporting members 8, 8 are attached to the wall 1 between each of the weir plates 3, 3 of B.
4 are inserted and constructed at required intervals in the length direction, and the scaffolding board 10 is placed on these supporting members 8,8. As a result, the scaffolding C will be installed inside the formwork B. The support member 8 is constructed using a weir plate 3.
It is convenient to use the formwork fastening fitting insertion hole 9 provided in the support member 8, and the method shown in FIG. 8, for example, can be considered to erect the support member 8.

In Fig. 8A, a long rod-shaped support rod 8 is passed through holes 9, 9 in the weir plates 3, 3, and a reinforcing pipe 11 of the support rod 8 is fitted in the part between the shear plates 3, 3. A scaffold board 10 is placed on the portion between the wall surface 14' and the weir board 3. In addition, if the support rod 8 is strong enough to withstand the working load,
This reinforcing pipe is unnecessary.

In FIG. 8B, a bolt is used for the support member 8, and a pipe 11 is fitted therein as described above, and nuts 12 are screwed into the screws at both ends and tightened.
With this method (B), the scaffolding can be built more reliably and firmly than with the method (A).

Once the scaffolding C is installed as described above, reinforcing bars 15 are set using this scaffolding C as shown in FIG. 2, and once the reinforcing bars 15 are completed, the scaffolding C is removed. In this case, first the scaffolding board 10 is removed, and then the supporting member 8 is removed.

After the removal of the scaffolding is completed, the formwork B installed at a distance from the wall surface 14' is moved and installed to a predetermined construction position in contact with the wall surface 14', and the fastening fittings 13 are installed at the required locations. Then concrete is poured. When moving and installing the formwork B, it goes without saying that the platform 7 is raised and lowered by the lifting device 5. Once the poured concrete has hardened, formwork A and B are removed and construction is complete.

In the illustrated embodiment, the scaffold C has a single-stage structure, but it goes without saying that it may be constructed in multiple stages as necessary.

In addition, in the embodiments shown in FIGS. 1 to 4 that have been described so far, one side is a stationary formwork A and the other is a movable formwork B, but as shown in FIG. Both formworks A and B can also be of stationary type. In this case, in order to move the formwork B, it is convenient to suspend the formwork B with a crane. In contrast to the one shown in FIG. 5, movable formworks can be used for both formworks A and B, as shown in FIG. 6.

Furthermore, the arrangement of formworks A and B that has been explained so far is such that one formwork A is installed at a predetermined construction position from the beginning; Initially, one formwork A is installed at a sufficient distance from the wall 14' to allow scaffolding C to be installed in the same way as the other formwork B, and scaffolding C' is also installed toward formwork A. You can do it like this. Scaffolding C and C' are installed in both formworks A and B in this way when the wall thickness to be constructed is large and reinforcing work is difficult or impossible with only the scaffolding of the other formwork B. Extremely effective. Note that even in this case, it goes without saying that one or both of the formworks may be of a stationary type.

The construction method of the present invention is particularly suitable for constructing thin structures. In other words, it is most economical to use a single member with a diameter large enough to be inserted into the formwork fastening fitting insertion hole 9 of the weir plate 3 as the support member 8 installed between the pair of formworks. For this purpose, the spacing between the forms should be within the allowable range of the strength of the support member 8. Therefore, the present invention provides a formwork interval that is such that, for example, a single bar can be used as the support member 8. It is most suitable for thin structures.

As explained above, in constructing a reinforced concrete structure, the present invention first installs formwork at or near a predetermined construction position, and then installs a scaffold using a pair of formwork as supports to assemble the reinforcing bars. The scaffolding is then removed and the formwork is moved to the predetermined construction position, so the formwork is used for most of the components of the reinforcing steel scaffolding. There is almost nothing else.

In addition, the present invention uses formwork sheathing boards instead of handrails to ensure the safety of workers, which are always required in conventional scaffolding, and the scaffolding for large-scale reinforcing bars is assembled. Compared to conventional methods, this method has many advantages, such as significantly reducing the amount of materials used, as well as significantly reducing the labor required to install and remove scaffolding, as well as the construction period and cost, improving the economic efficiency of concrete structure construction. This is effective, especially since scaffolding is constructed with supporting members installed between a pair of formworks serving as load-bearing members inside the formwork, so scaffolding is constructed in such a way that the strength of the supporting members is small. A greater effect can be obtained when constructing a structure with a relatively narrow frame interval, that is, a structure with a small thickness.

[Brief explanation of the drawing]

The drawings show the implementation procedure of the present invention, and Fig. 1 is a side sectional view showing the state in which scaffolding has been installed in the construction of the wall, Fig. 2 is a side sectional view showing the state in which the reinforcing bars are installed, and Fig. Figure 3 is a plan view of Figure 2, Figure 4 is a side sectional view showing the formwork installed in a predetermined position,
FIGS. 5 to 7 are side sectional views showing other embodiments, and FIGS. 8A and 8B are side sectional views showing two examples of scaffolding facilities. A, B...Formwork, C...Scaffolding, 1...Foundation, 2
... Vertical flap, 3 ... Weir plate, 4 ... Brace, 5
... Lifting device, 6 ... Traveling wheels, 7 ... Frame, 8
... Supporting member, 9 ... Hole, 10 ... Scaffolding board, 11
...Pipe, 12...Nut, 13...Tightening fitting, 14...Wall body, 14'...Wall surface, 15...Reinforcement bar.

Claims (1)

[Claims] 1. When constructing a concrete structure, a pair of formworks are installed facing each other with a gap the required distance apart from the predetermined construction position, and supporting members are erected between these formworks to construct a scaffold. This method of constructing a concrete structure is characterized in that the scaffolding is then used to assemble reinforcing bars, the scaffolding is then removed, the formwork is moved to a predetermined construction position, and concrete is poured.