JPH07158264A - Construction method of sliding form - Google Patents

Abstract

PURPOSE:To firmly support a form without enlarging the whole device. CONSTITUTION:On the inside of a form 2 arranged along the sectional form of a structure, an edge cutting panel 4 relatively slid to the form 2 is continued to the upper part of the edge cutting panel situated below, and a separator 10 is arranged between the opposed forms 2. Concrete is placed in the inside of the edge cutting panel 4, and after the concrete is hardened, the separator is removed, and a raising and lowering jack 8 suspended from a yoke 3 for supporting the forms 2 is then removed, whereby a reaction is taken against the guide rod or main reinforcement buried in the existing structure to raise the form 2 together with the yoke 3. These processes are repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding formwork method.

[0002]

2. Description of the Related Art In the conventional sliding formwork method, a formwork arranged along the sectional shape of a structure is lifted by a jack while applying a reaction force to a guide rod or a main bar embedded in the structure, Compared with the method of repeating the work cycle of placing concrete and assembling, disassembling, and reassembling concrete, the concrete structure is continuously constructed upward by placing concrete in the formwork. , Because it is possible to move the formwork upward while interlocking with the hardening time of the concrete while pouring and curing the concrete,
There is an advantage that work can be performed continuously.

[0003]

However, in the formwork apparatus used in such a conventional sliding formwork method, it is necessary to firmly support the formwork against a large concrete pressure. As a result, it is necessary to increase the size of the yoke and the like in order to dispose the reinforcing support material of the formwork, resulting in an increase in the size of the entire apparatus. When the size of the entire device increases, the weight of the device increases, which increases the free length of the guide rod and causes a problem that the guide rod easily buckles. Moreover, since the adhesion strength between the formwork and the concrete becomes large, it is necessary to apply a large reaction force to the guide rod, and the problem of buckling becomes significant.

Further, in order to finish a concrete structure with high accuracy, it is conceivable to place concrete having good fluidity and high placing pressure, but when such concrete is placed in a formwork. The above problem becomes more remarkable because it is necessary to more firmly support the mold.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a sliding formwork method capable of firmly supporting a formwork without increasing the size of the entire apparatus.

[0006]

In order to achieve the above-mentioned object, an edging panel that causes relative sliding with respect to the mold is located inside a mold arranged along the sectional shape of a structure. The mold is connected to the upper part of the edging panel, the separator is arranged between the facing molds, and the concrete is set inside the edging panel to cure the concrete, and then the separator is removed before the mold is formed. Is repeated.

[0007]

Since the separator is disposed between the facing molds, the yoke can be firmly supported without increasing the size of the yoke even if the height of the mold is set large.
Moreover, since the edging panel is placed inside the formwork, when the formwork is raised, the edging panel is fixed to the side of the concrete and slips with the formwork to perform a smooth ascent operation. Therefore, the mold surface does not rub against the concrete surface, and the height dimension of the mold frame can be further increased. Since the separator is disposed between the facing molds, even if the height of the molds is increased in this way, the molds can be firmly supported without increasing the size of the yoke.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a sliding formwork method of the present invention, in which a formwork 2 arranged along the cross-sectional shape of a concrete structure 1 to be obtained and an outside of the formwork 2 are provided. And a yoke 3 for supporting this, and the mold 2
A sliding formwork apparatus for constructing a structure 1 by stacking a certain number of concrete structures 1a, 1b, ... According to the height dimension of the formwork 2 in order from the bottom for each ascending work is used.

An edge cutting panel 4 is arranged inside the formwork 2. The edging panel 4 is made vertically longer than the height dimension of the formwork 2. For example, as shown in an enlarged view in a part of FIG. By sticking a certain sheet 4b, a relative slip is generated with respect to the form 2, and the sheet is left as it is on the side surface of the structure 1 so that it also serves as a curing sheet. By thus arranging the edging panel 4 inside the formwork 2, the formwork 2 does not rub the surface of the structure 1, so that the height dimension of the formwork 2 can be set large.

The yoke 3 is arranged around the mold 2 and supports the pillar 5, a beam 6 integrally assembled on the upper part of the pillar 5, and a work floor integrated around the pillar 5. It consists of 7. A lifting jack 8 is provided at the lower center of the beam 6. The jack 8 raises the entire apparatus by applying a reaction force to a guide rod 9 (often used in combination with a vertical bar (main bar) instead of the guide rod) embedded in an existing structure.

Next, a procedure for constructing the structure 1 using the above mold apparatus will be described. First, FIG. 1 shows a state in which concrete C has already been cast into the formwork 2 and, as a result, a new concrete structure 1b has been constructed on top of the existing concrete structure 1a. An edge cutting panel 4 is interposed between the concrete structure 1b and the formwork 2. Until the concrete C hardens, the concrete structure 1
At the upper part of b, a worker performs the joining of the vertical bars and the work of arranging the horizontal bars.

When the concrete C has hardened until it exhibits the required strength, the separator 10 which will be described later is removed, and the jack 8 is driven to generate a reaction force on the guide rod 9 and the mold as shown in FIG. The frame 2 and the yoke 3 are large at one time (the lower end of the frame 2 is the concrete structure 1
(Up to the point where it is located at the upper end of b).
Since the edging panel 4 is installed inside the formwork 2, the formwork 2 can be raised smoothly and the surface of the concrete structure 1b is not rubbed.

Next, as shown in FIG. 3, a new edging panel 4 is connected to the upper part of the edging panel located below the new edging panel 4 already installed on the concrete pouring surface side of the form 2 and facing the formwork 2 further. A separator 10 is disposed between them, and a cone 2a and a foam tie 10b are fastened to the separator 10 to form a mold 2 (including an edge cutting panel 4).
Is supported and ready for the next concrete pouring.

In this state, by placing concrete in the placing space surrounded by the edge cutting panel 4, the concrete structure 1c is constructed on the concrete structure 1b. Since the mold 2 is supported by the separator 10, the yoke 3 can be made smaller than the conventional one by supporting the lateral pressure of the concrete on which the separator 10 is placed. Even when a large value is set and the value is greatly increased, the yoke can be firmly supported without increasing the size of the yoke.

In the following, one after another, bar arrangement, form rising, form fixing,
By repeating the separator installation, concrete placement, and separator removal in order, the structure 1 can be continuously constructed in accordance with the height dimension of the formwork 2.

The edging panel 4 left on the side surface of the structure 1 can be peeled off in order from the lower part and diverted upon completion of the curing period. Further, the surface of the structure 1 after removing the edge-cutting panel 4 according to the smoothness of the edge-cutting panel 4 is smooth and beautifully finished.

Here, the conventional separator has male screw portions at both ends thereof, and the female screw portion of the cone on the diameter reducing side is screwed into the male screw portion, and the mold is applied to the end face of the cone on the diameter increasing side. The formwork is supported by screwing the female screw part of the form tie from the outside of the formwork to the male screw part which is in contact with and protrudes from the expanded diameter side and penetrates the edging panel 4 and the formwork 2. is there.

By the way, the separator 1 for supporting the mold 2
If 0 is still installed, a new edging panel 4 cannot be connected. Therefore, after lifting the formwork 2 and the yoke 3 by the lifting jack 8, the separator 10 is removed (at this point, the concrete Strong support for the form is not required as it has already hardened) It is necessary to splice a new edging panel on top of the underlying edging panel. As a simple method, it is conceivable to bury the PVC pipe between the molds, insert a tie rod in place of the separator into the PVC pipe and fasten it, and remove the tie rod when the mold 2 is raised.

Further, as means for enabling connection of the edging panel without removing the separator, for example, a method of forming a slit for penetrating the separator (actually a form tie) long in the vertical direction at a position corresponding to the separator of the edging panel. A method is conceivable in which female threaded portions are provided on both end surfaces of the cone, and male threaded portions of the form ties are screwed into the female threaded portions, and only the form ties are removed when the mold is raised.

[0020]

As described above in detail with reference to the embodiments, the sliding formwork method according to the present invention has the following effects.

Since the separator is arranged between the facing molds, the yoke can be firmly supported without increasing the size of the yoke even if the height of the mold is set large. Since the edging panel is arranged inside the mold, the height of the mold can be further increased. However, even if the height of the mold is increased in this way, the yoke can be moved by the separator. The mold can be firmly supported without increasing the size.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing one step of a sliding formwork method according to the present invention.

FIG. 2 is a cross sectional view showing the next step.

FIG. 3 is a cross-sectional explanatory view showing the next step.

[Explanation of symbols]

 1 Concrete Structure 2 Formwork 3 Yoke 4 Edge Cutting Panel 5 Pillar 6 Beam 7 Working Floor 8 Lifting Jack 9 Guide Rod 10 Separator C Concrete

Front Page Continuation (72) Inventor Masami Ito 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Stock Company (72) Inventor Shigeyuki Togawa 4-640 Shimoseido, Kiyose-shi, Tokyo Obayashi Engineering Co., Ltd. In the laboratory (72) Inventor Takayoshi Hirata 4-640 Shimoseido, Kiyose-shi, Tokyo Obayashi Corporation Technical Research Institute Co., Ltd.

Claims (1)

[Claims] 1. An edge cutting panel that causes relative sliding with respect to the inside of a mold arranged along the cross-sectional shape of a structure is connected to an upper portion of an edge cutting panel located below and opposed to each other. A step of arranging a separator between molds, pouring concrete inside the edging panel to cure the concrete, and then removing the separator and then raising the mold is repeated. Sliding formwork method.