JP2959367B2 - Formwork equipment - Google Patents

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 use in constructing a concrete structure having substantially the same horizontal sectional shape in the vertical direction.

[0002]

2. Description of the Related Art As a method of continuously constructing such a concrete structure, a sliding form method is generally employed. The sliding form device used in this method includes a form disposed along the cross-sectional shape of the structure, a yoke outside and supporting the form, and fixed to the upper center of the yoke. There is also known a device provided with a rising jack which rises by taking a reaction force on a guide rod embedded in a structure.

[0003] Once the formwork device is set once, the concrete jacks are driven upward by driving the ascending jacks while concrete is poured into the formwork, thereby continuously moving the concrete structure upward. Compared to the method of repeating the work cycle of placing concrete and assembling, dismantling, and reassembling the formwork, it is possible to construct concrete structures with almost the same horizontal cross-sectional shape in the vertical direction in a short period of time. be able to.

[0004]

However, in this method, since the formwork rises while being in contact with the surface of the concrete before the concrete has not exhibited sufficient strength, the surface of the concrete is colored by abrasion or rust juice. In addition to the possibility of unevenness, the form is raised while cutting the adhesion to the concrete while the form is in contact with the entire outer surface of the concrete, so the sliding resistance is large and the capacity of the jack is set large. Accordingly, it is necessary to increase the size of the entire apparatus.

According to the present invention, while it is possible to construct a concrete structure having substantially the same horizontal sectional shape in the vertical direction in a short period of time, it is possible to reduce the capacity of the ascending jack and thereby reduce the size of the entire apparatus. It is another 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, there is provided a plywood-made weir plate arranged along the cross-sectional shape of a concrete structure, and an upper and lower fixed to the back surface of the weir plate. And a support having a support plate which is disposed so as to be slidable relative to the back of the support and which rises while supporting the crosspiece. Claim 1).

It is preferable that each of the joints has a tenon structure which is fitted in an uneven shape in a vertical direction.

[0008]

In the formwork apparatus according to the first aspect, after the concrete poured into the weir plate is hardened, when the support is raised while supporting the pier, the weir plate comes into contact with the concrete surface. Left in state. In the shoring, the frictional force is small as compared with the case where the backrest slides on the back surface of the support and comes into contact with the entire surface of the dam plate, and can be raised with a small driving force.

In the case of adopting the structure according to the second aspect, when assembling the formwork, the upper and lower dam plates can be positioned by tenoning the upper and lower arbor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show the entire configuration of a formwork apparatus according to the present invention. FIG. 1 shows an example in which the formwork apparatus is applied to the construction of a concrete structure 1. The formwork device includes a plurality of pairs of dam plates 3 arranged along the cross-sectional shape of the concrete structure 1 and interconnected by a separator 2, and a vertically long width fixed to the back surface of each dam plate 3. It comprises a narrow wooden bar 4 and a support 5 which is arranged so as to be slidable relative to the back surface of the wooden bar 4 and which rises while supporting the cross bar 4.

Each of the weir plates 3 is composed of a thin plywood such as a veneer plate 6 and a sheet 7 made of plastic or the like adhered to a concrete casting surface of the veneer plate 6. Sheet 7
This is for improving the releasability of the weir plate 3, curing the concrete surface, and keeping the surface smooth. The opposing weir plates 3, 3 are positioned and fixed so as to maintain a constant interval by screw-connecting a cone 2a to both sides of the separator 2 and connecting protruding ends from the weir plate 3 by form ties 2b. .

As shown in an enlarged view of a part of FIG. 2, the upper end of the support 4 has a concave cross section, and the lower end is formed with positioning fitting portions 4a and 4b having a convex cross section. When connecting a new weir plate 3 to the upper part of the weir plate 3,
By tenoning a and 4b with each other, the upper and lower dam plates 3 can be positioned and fixed so as to form the same plane.

The shoring 5 is raised by taking a reaction force on the ground portion or the concrete structure 1 itself by a lifting jack (not shown) or the like, and is arranged in a state of slidingly contacting the rear surface of the support 4. A support plate 8 made of a metal foam or the like, a belly 9 connecting the back surface of the support plate 8 in the horizontal direction, and an H connected perpendicularly to the belly 9 in the vertical direction.
Although not shown, a plurality of work scaffolds for assembling and disassembling are provided on the outer side of the shoring 5.

The support plate 8 is arranged so that a gap 8a is provided at a position where the foam tie 2b projects.
The form tie 2b can be attached and detached, and the dam plate 3 can be fixed to the support 5 by connecting the head of the form tie 2b to the belly 9. In this embodiment, a metal foam is used as the support plate 8, but if required rigidity is low, a plywood may be used.

In the above construction, in order to construct the concrete structure 1, first, as shown in FIG.
After assembling the shoring 5 and arranging necessary reinforcing bars between the dams 3 and 3 and arranging the separator 2, concrete is poured to the vicinity of the top end of the dam 3.

At this time, the deformation stress on the dam plate 3 due to the driving pressure is supported by the tensile force of the separator 2 in addition to the support rigidity of the support plate 8, so that the dam plate 3 is formed of a thin veneer plate. Even in this case, the original assembled shape is maintained without deformation.

After the concrete has hardened, if the form tie 2b is removed, the support 5 and the weir plate 3 are separated from each other. Therefore, if only the shoring 5 is raised, the weir plate 3 (pier 4
) Will be left on the concrete casting surface.

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

After the lifting operation, the assembling of the dam plate 3 and the assembling work of the separator 2 are performed again. In such an assembling operation, a new weir plate 3 is positioned on the remaining weir plate 3, but new fitting is performed only by fitting the fitting portions 4a and 4b of the joint 4 into a tenon form. When the weir plate 3 can be arranged on the same surface, the separator 2 is arranged between the weir plates 3 in this state, connected by a foam tie 2b, and the head of the
After the assembly is completed, the next concrete can be cast.

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

The work for removing the weir plate 3 after curing of the concrete can be carried out by using a work scaffold arranged below the support 5 as a foothold, and the dismantled weir plate 3 is transferred to the upper side of the support 5. Since it can be diverted to formwork assembly again, it is economical, and there is no need to add or remove temporary scaffolds.

Here, the conventional separator has external thread portions at both ends, and a female screw portion on the reduced diameter side of the cone 2a is screwed into the external thread portion, and a formwork is attached to an end surface on the enlarged diameter side of the cone 2a. And the female thread of the form tie 2b is screwed from the outside of the weir plate 3 to the male screw part that protrudes from the enlarged diameter side and penetrates the weir plate 3, thereby supporting the weir plate 3. It is.

Incidentally, the separator 2 supporting the weir plate 3
In the above embodiment, the gap 8a is formed between the support plates 8 and 8 because the support 5 including the support plate 8 cannot be raised when the support plate 8 is still installed. , A tie rod instead of the separator 2 is inserted into the PVC pipe and fastened, and the tie rod is removed when the support 5 rises, or female threads are provided on both end faces of the cone 2a. A male thread portion of the foam tie 2b may be screwed into the female thread portion so that only the foam tie 2b is removed when the support 5 is raised.

In the above embodiment, the positioning fitting portions 4a and 4b of the support bar 4 are formed such that the upper end of the crosspiece 4 has a concave cross section and the lower end has a convex cross section. It goes without saying that the setting may be reversed.

[0025]

As described in detail in the above embodiment, in the formwork apparatus according to the present invention, when the supporter slides on the back surface of the sash to come into contact with the entire surface of the dam plate. In comparison, since the frictional force is small and can be raised with a small driving force, the same advantage as the conventional sliding form method, that is, a concrete structure having a horizontal cross-sectional shape that is almost the same in the vertical direction can be obtained in a short time. While it can be constructed, the capacity of the lifting jack can be reduced, thereby reducing the size of the entire device. In addition, since the weir plate is left in contact with the concrete surface, the finish of the concrete surface is improved. be able to.

Also, when assembling the formwork, the upper and lower dams can be positioned by tenoning the upper and lower stays. Sufficient assembly accuracy can be ensured while the operation is simple.

[Brief description of the drawings]

FIG. 1 is a plan view when a formwork device 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 board 4 Yagi 4a, 4b Positioning fitting part 5 Support 8 Support plate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Minoru Mizumoto 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo headquarters (56) References JP 50-43725 (JP, A) 63-1148 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 11/28 E04G 11/22

Claims (2)

(57) [Claims] 1. A plywood-made weir plate arranged along the cross-sectional shape of a concrete structure, a vertically long narrow narrow bar fixed to the back surface of the weir plate, and a back surface of the narrow wooden bar And a support having a support plate which is disposed so as to be slidable relative to the support and which rises while supporting the crosspiece. 2. The structure according to claim 1, wherein each of the timbers has a tenon structure which is fitted in an uneven shape in a vertical direction.
The formwork device as described.