JPH0814157B2 - Form panel and abandoned form using the panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form panel and a discard form using the panel.

[0002]

2. Description of the Related Art Conventionally, a mesh formwork method characterized by using a so-called rib lath as a discard formwork instead of a plywood weirboard in order to save labor in dismantling formwork and improve quality of skeleton concrete. There is a construction method called.
9 to 11 show a construction example in which a concrete foundation is constructed by the mesh formwork method.
In the figure, reference numeral 33 denotes a rib lath, which is a net-like portion 34 formed by drawing a thin sheet metal at regular intervals and stretching it.
And lateral ribs 35 that integrally connect the mesh portions 34.

As shown in FIG. 11, the rib laths 33 are vertically arranged side by side at predetermined positions on the concrete for discarding 36, and the surface is formed by vertical pipes 37 and horizontal pipes 38 arranged in a lattice. It is supported all over. That is, conventionally, the foam tie 40 is attached to the tip of the round separator 39 that penetrates the rib lath 33 from the back surface side, and the rib lath 33 is sandwiched between the washers 41 and 42 provided on the foam tie 40 on the vertical pipe 37 side. , The basic concrete formwork capable of withstanding the pressure of the frame concrete cast between the ribs 33.

After pouring and curing the skeleton concrete, the foam tie 40 is removed and the horizontal and vertical pipes 41, 4 are removed.
2 is dismantled, but the rib lath 33 is said to be buried in the concrete as it is, which saves the trouble of dismantling the formwork. In addition, 43 is a reinforcing bar that has been reinforced in advance in the formwork.

[0005]

However, in the above-mentioned conventional technique, since the mesh-like rib lath 33 is used as the dam of the formwork, the vertical side surface of the skeleton concrete is exposed to the outside air like the upper surface thereof. Will be. Therefore,
Especially in summer, after pouring concrete, moisture was discharged to the outside from the mesh portion of the rib lath, which accelerated the drying on the vertical side of the skeleton concrete, which often caused cracking.

On the other hand, in winter, in order to prevent frost damage of concrete or accelerate hardening of concrete, not only the upper surface of the skeleton concrete but also the standing surface are covered with a curing sheet, so that the curing after placing is careful. I had to do it. In view of the above-mentioned circumstances, the present invention provides a formwork panel and a formwork panel using the formwork panel capable of obtaining high-quality skeleton concrete irrespective of the seasons of summer and winter when adopting the discarding formwork method. The purpose is to provide.

[0007]

In order to achieve the above object,
The present invention has taken the following technical means. That is, according to the first aspect of the invention, the panel main body 2 made of a sheet metal used as a dam of the formwork constituting the vertical side of the skeleton concrete 9 has a large number of through holes 8 to the extent that the mortar of the skeleton concrete 9 leaks out. The cover member 10 which is opened, is opened only on one end side in the vertical direction, and is bulged toward the back surface side of the panel body 2,
It is characterized in that it is formed by cutting and raising from the peripheral edge of the through hole 8.

The invention according to claim 2 is the form panel.
1 constitutes the standing side surface of the skeleton concrete 9 on the back side thereof, and the opening side ends of all the cover members 10 are uniformly arranged in either the upward direction or the downward direction.

[0009]

In the summer, for example, as shown in FIG. 7, the mold panel 1 is arranged so that the opening side end of the cover member 10 faces downward.
When set to, only the heat of hydration 30 generated inside can be released to the outside from the opening 11 of the cover member 10 in a state where the moisture of the skeleton concrete 9 hardly escapes.

On the other hand, in winter, as shown in FIG.
When the formwork panel 1 is set so that the opening side end of the cover member 10 faces upward, this time the heat of hydration 30 of the skeleton concrete 9 is prevented from escaping by the cover member 10, while the moisture 31 of the skeleton concrete 9 is It can be discharged downward through the opening 11.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a form panel with a lath adopted in this embodiment, which is composed of a panel body 2 made of a thin sheet metal plated with zinc or the like. The panel main body 2 is provided with upper and lower reinforcing ribs 3 and 4 along both side edges thereof in the width direction (vertical direction in FIG. 1A).
Is formed by bending both width ends of the panel body 2 toward the back surface so as to form a substantially U-shaped cross section, and extends in the longitudinal direction of the panel body 2. The cross-sectional shape of the reinforcing ribs 3 and 4 is
The shape is not limited to the U-shape, but may be a semicircular shape or the like.

Reference numeral 5 is an auxiliary rib extending between the reinforcing ribs 3 and 4 in the width direction of the panel body 2, and is formed by bulging the panel body 2 toward the back surface in an arc shape in section. They are provided at regular intervals in the longitudinal direction of the main body 2 (left-right direction in FIG. 1A). Reference numeral 5a is a bottom rib provided on the bottom of the reinforcing ribs 3 and 4 and is formed by bulging the bottom toward the surface side in an arcuate cross section.

In addition, 6 is an insertion hole for a fixture such as a bolt 28 or a pin, and 7 is a separation hole, both of which are provided at the bottom of the reinforcing ribs 3, 4. In this embodiment, between the auxiliary ribs 5 of the panel body 2, a large number of substantially semi-elliptical through holes 8 that are long in the longitudinal direction of the panel body 2 are provided, and four through holes 8 are arranged in the same longitudinal direction. And the row of three through holes 8 side by side in the panel body 2
By arranging the holes alternately in the width direction, a total of 25 through holes 8
Are arranged between the reinforcing ribs 5.

The through hole 8 has a size such that the mortar portion of the slab concrete 9 that has not yet hardened and is placed on the back side of the panel body 2 leaks out (in this embodiment, 12 mm in the vertical direction and 12 mm in the horizontal direction).
The cover member 10 is formed by cutting and raising from the peripheral edge thereof. That is, as shown in FIG. 2, the cover member 10 is formed by punching the upper side of the transverse cut provided in the panel body 2 from the front surface side of the panel body 2 with a semi-elliptical male shape. The cover member 10 is formed at the same time as the formation of the through hole 8, and thereby the cover member 10 having the opening 11 only on the lower end side in the vertical direction is formed by bulging from the peripheral edge of the through hole 8 to the back surface side.

Further, the formwork panel 1 according to this embodiment has an upper reinforcing rib 3 of the upper and lower reinforcing ribs 3 and 4 on both sides in the width direction.
Has a cross-sectional size slightly larger than that of the lower reinforcing rib 4, and the upper reinforcing rib 3 has a retaining wall 12a and an inclined wall 12a formed by folding back the upper wall portion of the upper reinforcing rib 3 toward the back side. Equipped with 13. That is, as shown in FIG. 6, when the lower reinforcing ribs 4 of the other mold panel 1 arranged in parallel adjacent to the upper reinforcing ribs 3 of the mold panel 1 are pressed from the lateral direction, Reinforcing ribs 4 ride on the inclined wall 12a and are fitted and housed in the upper reinforcing ribs 3, so that the upper and lower reinforcing ribs 3 and 4 are superposed on each other so that the mold panel 1 can be easily connected to each other. After this connection, the retaining wall 12
Engages with the corner portion of the lower reinforcing rib 4 and restricts the lower reinforcing rib 4 from separating from the upper reinforcing rib 3 in the width direction.

3 to 7 show the case where the formwork panel having the above-mentioned structure is adopted as a waste formwork for concrete foundation. This discarding formwork 14 is composed of columns (supporting members) 16 that are erected at regular intervals on discarding concrete (foundation) 15.
And the form panel 1 that is laid between the columns 16 with the longitudinal direction being the horizontal direction, and the reinforcing bars 17 are pre-arranged inside.

As shown in FIG. 5, the pillar 16 is composed of a pillar main body 18 formed by bending a long steel plate on both sides in the width direction into a substantially U shape, and a bent end of the pillar main body 18 in the width direction. And a pair of guide grooves 19 and 19 formed by bending in a substantially U-shape toward one side. Separation holes 20 are formed at predetermined intervals in the longitudinal direction at the center of the column body 18 in the width direction. Reference numeral 21 is an insertion hole for a fixture such as a bolt 28 or a pin, which is provided on both sides of the column main body 18 in the width direction and a back plate 22 forming the guide groove 19.

Reference numeral 23 is a mount for vertically setting the support column 16, which is formed in an L-shape in a side view from the base plate portion 24 and the side plate portion 25. On both sides of the side plate portion 25, the side opposite to the base plate portion 24 is provided. Bent ribs 26
Are formed, and the board portion 24 is provided with nail holes 27 for concrete nails. Therefore, the pillar 16 is extremely easily erected on the concrete for discarding 15 by fitting the lower end of the pillar body 18 to the side plate portion 25 of the mount 23 fixed at a predetermined position on the concrete for discarding 15 from above. You can do it.

In this embodiment, after the pillars 16 are erected, the form panel 1 is slid between the pillars 16 so as to be installed from above. That is, as shown in FIG. 3, each form panel 1 has both upper and lower reinforcing ribs 3 and 4 fitted in the guide grooves 19 of the supporting column 16 while the upper reinforcing rib 3 is positioned above the supporting column 19 from above. It is installed between the columns 16 so as to slide in sequence from above. At this time, as shown in FIG. 6, since the above-mentioned retaining means 13 is provided on the upper reinforcing ribs 3 of the formwork panel 1 which was previously installed on the lower side, the newly installed formwork panel 1 is placed below it. Push it down towards the formwork panel 1 and its lower reinforcement ribs 4
Are fitted in the upper reinforcing ribs 3, whereby the upper and lower formwork panels 1 can be joined with one touch with both reinforcing ribs 3 and 4 in a superposed state.

As shown in FIG. 4, the formwork panel 1 thus arranged between the columns 16 is fastened with bolts 28 to the columns 16 at both ends of the reinforcing ribs 3 and 4, and the columns are opposed to each other.
By connecting 16 spaces with a round seperator 29,
Is completed. The support 16 and the reinforcing ribs 3 and 4 may be fixed with a dish-head-shaped pin.
If necessary in terms of strength, the round separators 29 may be interposed between the central portions of the mold frame panels 1 facing each other in the longitudinal direction.

After that, the skeleton concrete 9 is placed in the waste form 14, and at this time, the form panel 1 and the pillar 16 are placed.
Are said to be buried together, saving the labor of dismantling the formwork. As described above, in the present embodiment, the form panel 1 is slid and installed between the columns 16 sequentially from above, and the column 16 and the columns 16 are orthogonal to each other only by joining the vertically adjacent form panels 1 to each other. Since the grid-shaped formwork support structure composed of the reinforcing ribs 3 and 4 can be configured, there is no need to assemble and disassemble vertical and horizontal pipes outside the formwork as in the conventional case, and the number of construction steps can be significantly reduced.

Next, when each formwork panel 1 is erected between the columns 16, the cover member 10 is arranged toward the skeleton concrete 9 side. At this time, in this embodiment, the construction is performed in summer. In the case, as shown in FIG. 7, the form panel 1 is arranged with all the opening side ends of the cover member 10 facing downward, and when the construction is in winter, as shown in FIG. The formwork panel 1 is arranged with all the side edges facing up.

That is, in the summer season (FIG. 7), when the end of the cover member 10 on the opening side is directed downward, the opening 11 of the cover member 10 faces upward, so that the water content of the skeleton concrete 9 is increased by the opening 11. Unless it overflows from the outside, it does not flow to the outside, but the heat of hydration 30 of the building concrete 9 passes through the opening 11.
Since it escapes upward through 8 it is possible to prevent shrinkage cracks due to early hardening of only the concrete part near the formwork panel 1.

On the other hand, in the winter season (FIG. 8), when the opening side end of the cover member 10 is directed upward, the cover member 10 becomes a receiving port as seen from the back surface side, and this time the water of the skeleton concrete 9 is removed. While the Japanese heat 30 can be prevented from escaping to the outside, the moisture 31 in the mold 14 can be guided by the cover member 10 and discharged downward from the opening 11, so that the hardening of concrete in the vicinity of the mold panel 1 can be accelerated. It is possible to prevent frost damage of concrete.

[0025]

As described above, according to the present invention,
By arranging the formwork panel 1 with the cover member 10 facing downward in summer and with the cover member 10 facing upward in winter, it is possible to obtain a curing state of the skeleton concrete 9 suitable for each season, It is possible to obtain high quality building concrete 9 regardless of the season.

[Brief description of drawings]

FIG. 1 (a) is a front view of a formwork panel, and FIG. 1 (b) is (a).
FIG. 9 is a sectional view taken along line AA of FIG.

FIG. 2 is an enlarged perspective view of a through hole and a cover member.

FIG. 3 is a perspective view of a discarding mold.

FIG. 4 is a plan view of the same.

FIG. 5 is an explanatory view of mounting a support column.

6A and 6B are views for explaining the action of the retaining means, in which FIG. 6A shows before the reinforcing ribs are fitted, and FIG.

FIG. 7 is a vertical cross-sectional view of skeleton concrete in summer.

FIG. 8 is a vertical cross-sectional view of skeleton concrete in winter.

FIG. 9A is a front view of a rib lath according to a conventional example,
(B) is the same longitudinal cross-sectional view.

FIG. 10 is a side view showing a rib lath fixing structure.

FIG. 11 is a perspective view of a discarding mold using a rib lath.

[Explanation of symbols]

 1 Formwork panel 2 Panel body 8 Through hole 9 Frame concrete 10 Cover member 11 Opening

Claims (2)

[Claims] 1. A panel body (2) made of sheet metal for use as a dam of a formwork constituting an upright side of a skeleton concrete (9).
A large number of through-holes (8) were made to the extent that the mortar portion of the building concrete (9) leaked out, only one end side in the vertical direction was opened, and it was bulged to the back side of the panel body (2). A formwork panel characterized in that a cover member (10) is formed by cutting and raising from a peripheral edge of the through hole (8). 2. When the formwork panel (1) according to claim 1 constitutes an upright side surface of a building concrete (9) on the back side thereof, the opening side ends of all cover members (10) face upward or The discarded formwork using the formwork panel according to claim 1, wherein the formwork panel is arranged so as to face downward.