JPH07173935A - Formwork device - Google Patents

Abstract

PURPOSE:To construct in a short period a concrete structure whose horizontal sectional shape is nearly same in the vertical direction, to reduce the capacity of a lifting jack, to miniaturize the whole device, and also to improve the surface finishing of concrete. CONSTITUTION:A formwork device is provided with a many pairs of sheathing boards 3 that are arranged along the sectional shape of a concrete structure 1 and connected to each other with separators 2, narrow sash bars 4 that are long in the vertical direction and fixed to the back surface of the respective sheathing boards 3, and timberings 5 that are arranged so as to be relatively slidable to the back surfaces of the sash bars 4 and are erected while supporting the sash bars 4. In the upper and lower ends of the respective sash bars 4, positioning fitting parts 4a, 4b (not shown) formed in recessed and projected shapes in section are provided, and by tenon-jointing the fitting parts 4a, 4b to each other, the upper and lower sheathing boards 3 can be positioned and fixed to form the same surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork apparatus suitable for constructing a concrete structure having substantially the same horizontal sectional shape in the vertical direction.

[0002]

2. Description of the Related Art A sliding formwork method is generally adopted as a method for continuously constructing a concrete structure of this type. The sliding formwork device used in this method includes a formwork arranged along the sectional shape of a structure, a yoke outside the formwork for supporting the formwork, and fixed to the upper center of the yoke. It is known that a guide rod embedded in a structure is provided with a lifting jack that lifts by taking a reaction force.

Once the formwork device has been set, the concrete structure is continuously raised upward by driving the ascending jacks while the concrete is being placed in the formwork to sequentially raise the formwork. In comparison with the work method of repeating the work cycle of placing concrete and assembling, dismantling, and reassembling formwork, a concrete structure whose horizontal cross-sectional shape is almost the same in the vertical direction is constructed in a short time. be able to.

[0004]

However, in this method, since the mold rises while being in contact with the surface of the concrete before the strength of the concrete is sufficiently developed, the surface of the concrete is colored by scratches or rust. Not only is there a risk of unevenness, but the mold is in contact with the entire outer surface of the concrete and the mold is raised while cutting the adhesion to the concrete, so the sliding resistance is greatly increased and the capacity of the jack is set large. Therefore, it is necessary to increase the size of the entire apparatus.

According to the present invention, it is possible to construct a concrete structure whose horizontal cross-sectional shape is substantially the same in the vertical direction in a short period of time, but to reduce the capacity of the lifting jack, and thus to downsize the entire apparatus. At the same time, it is an object of the present invention to provide a formwork device capable of improving the finish of the concrete surface.

[0006]

In order to achieve the above object, according to the present invention, a weir board made of plywood is arranged along the cross-sectional shape of a concrete structure, and upper and lower parts fixed to the back surface of the weir board. A narrow tree long in the direction, and a supporting structure that is arranged slidably with respect to the back surface of the tree and that moves up while supporting the tree (claim 1). .

Further, it is preferable that each of the lumbers has a tenon structure which is fitted in an uneven shape in the vertical direction (claim 2).

[0008]

In the formwork apparatus according to the first aspect of the present invention, after the concrete cast in the dam plate is hardened, the dam plate comes into contact with the concrete surface when the supporting work is raised while supporting the pier. It is left in the state. The supporting work has a smaller frictional force than the case where it is brought into contact with the entire surface of the dam plate by sliding on the back surface of the tree, and it can be raised by a small driving force.

When the structure according to the second aspect is adopted, the upper and lower dam plates can be positioned by assembling the upper and lower lumbers at the time of assembling the mold.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show the overall configuration of the formwork apparatus according to the present invention. In the figure, an example in which the formwork apparatus is applied to the construction of a concrete structure 1 is shown. The formwork device is arranged along the cross-sectional shape of the concrete structure 1 and has a large number of pairs of dam plates 3 connected to each other by a separator 2 and a long width vertically fixed to the back surface of each dam plate 3. It is provided with a narrow rafter 4 and a supporter 5 which is slidably arranged relative to the back face of the rafter 4 and which is elevated while supporting the waffle 4.

Each of the dam plates 3 is composed of a thin plywood plate such as a veneer plate 6 and a sheet 7 made of plastic or the like attached to the concrete placing surface of the veneer plate 6. Sheet 7 is
This is for improving the releasability of the dam plate 3, for curing the concrete surface, and for keeping the surface smooth. The facing dam plates 3 and 3 are positioned and fixed so as to maintain a constant interval by screwing the cones 2a on both sides of the separator 2 and connecting the projecting ends from the dam plate 3 with the foam ties 2b. .

As shown in an enlarged view of a part of FIG. 2, the upper end of the tree 4 has a concave cross-section, and the lower end has convex fitting cross-sections for positioning 4a, 4b. When fitting a new dam plate 3 to the upper part of the dam plate 3, the fitting portion 4
The upper and lower barrier plates 3 can be positioned and fixed so that they are flush with each other by arranging the a and 4b together.

The supporting work 5 is to be lifted by taking a reaction force to the above-ground portion or the concrete structure 1 itself by an unillustrated lifting jack or the like, and is arranged in a state of sliding contact with the back surface of the above-mentioned tree 4. A support plate 8 made of metal foam and the like, and an abutment 9 for connecting the back surface of the support plate 8 in the lateral direction, and an H connected vertically to the abutment 9 upright.
Although not shown, a plurality of work scaffolds for assembling and disassembling are provided on the outside of the supporting structure 5 as well as the shaped steel 10.

The support plate 8 is arranged so that a gap 8a is provided at a position where the foam tie 2b projects.
The work of attaching and detaching the foam tie 2b is made possible, and the dam plate 3 can be fixed to the support 5 side by raising the head of the foam tie 2b and connecting it to the abdomen 9. Although metal foam is used as the support plate 8 in this embodiment, plywood may be used if the required rigidity is low.

In order to construct the concrete structure 1 having the above-mentioned structure, first, as shown in FIG.
After assembling the supporting works 5 and arranging the necessary reinforcements and the separators 2 between the dam plates 3 and 3, concrete is poured up to near the top end of the dam plate 3.

Since the deformation stress to the dam plate 3 due to the driving pressure at this time is supported by the tensile strength of the separator 2 in addition to the support rigidity of the support plate 8, the dam plate 3 is made of a thin veneer plate. Even in the case, the original assembled shape is maintained without deformation.

After the concrete is hardened, the support tie 5 and the dam plate 3 are separated by removing the form tie 2b. Therefore, if only the support work 5 is raised, the weir plate 3 (the pier 4
Only) will be left on the concrete pouring surface.

Further, when the support 5 is raised, each support plate 8 is almost in linear contact with the tree 4, and the friction is small compared to the case where the support plate 8 is in contact with the entire surface of the dam plate 3. The driving force can be small.

After the raising operation, the weir plate 3 is assembled and the separator 2 is assembled again. In such an assembling work, a new weir plate 3 is positioned on the remaining weir plate 3, but a new one is simply formed by fitting the fitting portions 4a and 4b of the lumber 4 in a tenon assembly. If the dam plate 3 can be arranged on the same surface, and the separator 2 is arranged between the dam plates 3 in this state, the form ties 2b are connected to each other, and the head of this is raised and connected to the belly 9,
After the assembly is completed, the next concrete can be placed.

Therefore, the construction of the concrete structure 1 can be completed by repeating the above-described work cycles one after another to a desired height.

Incidentally, the removal work of the dam plate 3 after curing the concrete can be carried out by using the work scaffolding arranged at the lower part of the support work 5 as a foothold, and the dismantled weir plate 3 is transferred to the upper side of the support work 5. Since it can be reused for assembling the formwork again, it is economical and it is not necessary to add or remove the temporary scaffolding.

Here, the conventional separator has male screw portions at both ends, and the female screw portion of the cone 2a on the diameter reducing side is screwed into the male screw portion, and the end face of the cone 2a on the diameter increasing side is formed with a mold. Supporting the dam plate 3 by screwing the female screw part of the foam tie 2b from the outside of the dam plate 3 to the male screw part which is abutted with and protrudes from the expanded diameter side and penetrates the dam plate 3. Is.

By the way, the separator 2 for supporting the barrier plate 3
Since the support 5 including the support plate 8 cannot be lifted if the support plate 8 is still installed, the gap 8a is formed between the support plates 8 and 8 in the above-described embodiment. The PVC pipe is buried in the PVC pipe, a tie rod that replaces the separator 2 is inserted into the PVC pipe, and this is fastened, the tie rod is removed when the support 5 is raised, and female thread portions are provided on both end surfaces of the cone 2a. A male screw portion of the foam tie 2b may be screwed onto the female screw portion so that only the foam tie 2b is removed when the support 5 is raised.

Further, in the above embodiment, the positioning fitting portions 4a and 4b of the coffin 4 are formed so that the upper end of the splint 4 has a concave sectional shape and the lower end has a convex sectional shape. It goes without saying that the setting may be reversed.

[0025]

As described above in detail with reference to the embodiments, in the formwork apparatus according to the present invention, when the supporter slides on the back surface of the tree, it comes into contact with the entire surface of the dam plate. Compared with this, the frictional force is small and it can be raised with a small driving force, so it has the same advantage as the conventional sliding formwork method, that is, a concrete structure whose horizontal cross-sectional shape is almost the same in the vertical direction can be obtained in a short period of time. Although it can be constructed, the capacity of the lifting jack can be reduced and the overall size of the device can be reduced, and the weir plate is left in contact with the concrete surface so that the finish of the concrete surface is improved. be able to.

Further, at the time of assembling the form, the upper and lower dam plates can be positioned by arranging the upper and lower lumber mortises, and in particular, even when the dam plate is thin, it is assembled. Although the work is simple, it is possible to secure sufficient assembly accuracy.

[Brief description of drawings]

FIG. 1 is a plan view in the case where the formwork apparatus of the present invention is applied to a horizontally long concrete structure.

FIG. 2 is a sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Separator 3 Weir plate 4 Satsuki 4a, 4b Positioning fitting part 5 Support 8 Support plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Mizumoto 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office

Claims (2)

[Claims] 1. A weir board made of plywood arranged along the cross-sectional shape of a concrete structure, a vertically long narrow tree fixed to the back of this weir board, and the back of this tree. A formwork device, which is provided so as to be slidable relative to the pier, and is provided with a support work that rises while supporting the pier. 2. A mortise structure in which each of the trees is fitted in an uneven shape in the vertical direction.
Formwork device described.