JPS603591B2 - Formwork for forming curved parts of concrete walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork for forming a curved portion of a concrete wall by approximately treating it as a collection of a large number of planes.

The formation of curved parts of concrete, such as manholes,
There is a standard for small molds with a diameter of less than 2, and a large number of molds having arcuate forming surfaces are joined together.

However, when it comes to large items with a diameter of 2 or more, the number of installations is small and there are various sizes, so there is no standard.
It must be designed and constructed according to each site. Therefore, if we were to use the same method as that used for Type 4 for such large objects, we would have to custom order expensive steel formwork, and this custom-made formwork would require one-time use. Since it is only used once and has no other use, the formwork costs are extremely wasted. For this reason, a method of forming a formwork by curving a plywood board to match the curved surface of the concrete wall to be formed is also used, but this method has the disadvantage that it is not durable and becomes unusable after a few uses. In addition, there was a drawback that the work of bending was troublesome. Therefore, in order to eliminate the above-mentioned drawbacks, this invention was created by focusing on the fact that the curved surface part of a concrete wall with a large radius of curvature can be approximately regarded as a collection of many planes. , the purpose is to provide a formwork suitable for this purpose.

That is, the curved part of the concrete wall to be formed is regarded as a collection of many planes, and at least two plane parts corresponding to the planes of the concrete wall are formed at a certain angle to each other to form a forming plate. The connecting plate is fixed at a certain angle on both sides of the plate, and one or both of the flat parts or between the forming plate and the connecting plate is configured to have elasticity, and can be used for a wide variety of purposes. The aim is to provide a product that is usable, has dramatically increased durability, and is easy to assemble. Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a first embodiment of the present invention is shown, and a formwork la is used to form the inner curved surface portion of a concrete wall by approximately treating it as a collection of a large number of planes. Then, the plane parts 2a, 2 corresponding to two consecutive planes
The forming plate 3 consisting of b and the following connecting plates 4a, 4b, 4c
, 4d.

The plane parts 2a, 2b of the forming plate 3 have an angle Q, (degrees) between them measured from the coupling plate side, which is slightly smaller than 180 degrees (for example, 176 degrees), and the plane parts 2a, 2b
Width 1, 1 (skin) of b is approximately equal to a multiple of pi (
For example, it has become 15.7 佽). The connecting plates 4a, 4b and 4c, 4d are fixed to both sides of the forming plate 3 in the horizontal and vertical directions to be connected to other formwork, and the left and right connecting plates 4a, 4b are L-shaped. the connecting plate 4a
, 4b and the forming plate 3 are slightly smaller than 90 degrees (for example, 88 degrees), and the connecting plates 4a and 4b are formed by bending thin plates. Because of this, it has elasticity and can slightly change the angle 8 with the forming plate 3. On the other hand, the upper and lower connecting plates 4c, 4
d is slightly bent in the horizontal direction in a 〈 shape corresponding to the shape of the forming plate 3, and is reinforced by fixing angle members 5 to the upper or lower surface on both left and right sides. These connecting plates 4
A hole 6 is appropriately formed in each of a, 4b, 4c, and 4d, and a U-clip, bolt, or the like is inserted into the hole 6 to fix it to another similar formwork. Incidentally, a plurality of reinforcing plates 7 having the same shape as the upper and lower connecting plates 4c and 4d, and a longitudinal holding plate 8 are fixed to the forming plate 3, thereby reinforcing the forming plate 3. 3 and 4, a second embodiment of the present invention is shown, and when compared with the previous embodiment, it is found that while the formwork la of the previous embodiment was for the inside of a concrete wall, this embodiment The formwork lb in the example is for outside use.

Therefore, the mutual angle Q2 (degrees) measured from the coupling plate side of the flat parts 2a and 2b of the forming plate 3 is slightly larger than 180 degrees (for example, 184 degrees), and the forming plate 3
The angle 82 (degrees) formed by the connecting plates 4a and 4b is slightly larger than 90 degrees (for example, 92 degrees). Further, the upper and lower connecting plates 4c, 4d and the reinforcing plate 7 have the same shape as in the previous embodiment and can be used in common, but the surfaces on which they are fixed to the forming plate 3 are reversed. Incidentally, the same parts as those in the above embodiment are denoted by the same reference numerals in the drawings, and the explanation thereof will be omitted. In FIG. 5, the formwork la in the first and second embodiments,
A method of forming a circular concrete wall, such as a manhole, using lb is shown, and the circular concrete wall to be formed is approximately formed as a polygonal surface that is a collection of many planes.

That is, the inner surface is formed by combining a large number of molds la, and the outer surface is formed by combining a large number of molds lb. In this case, if the inner diameter is d (skin) and the outer diameter is d2 (reduction), then the number of formworks la and lb is X, "X2 is the formwork la,
Since the width of one parallel part 2a or 2b of lb is 1 (skin), x, :field... ...'11 x2=kai 2... ...'21.

Therefore, since 1 is taken to be 15.7 skin, for example, d,
: When it is 300, let = 3.14 and set X, = 3 hard,
When d2=350 arcs, X2=35, and the relationship with d, original X, and X2 is extremely easy to understand and convenient.

By the way, if the angle from the center ○ of the circular concrete wall corresponding to 1 is y,, y2 (degrees), then y: powder, y2
= crocodile...shelf yI = 18o- (shouju also). ．． ．． ．． ．． ．．
[41y2=180-ku18o-Q2 books o-ology)...
...'51, so the mountain = side is also - foundation surface ■ Q2 = 18o-ra fort...'7}, so Q,,Q2 are changed according to the number of formworks la and lb. There must be.

However, as mentioned above, since elasticity is provided between the connecting plates 4a and 4b and the forming plate 3, it is possible to change Q, , Q2, and therefore the number of formworks X, , X2 (formula 11, '2} to the diameter d,,d of the circular concrete wall
Proportional to 2. ) can cope with fluctuations in 6 to 9, a third embodiment of the present invention is shown, and the formwork lc in this embodiment is also similar to the first embodiment.
Like the formwork la of the embodiment, it is for inside use, but in the first embodiment, the forming plate 3 and the joining plates 4a, 4
In contrast, in this embodiment, elasticity is provided between the flat parts 2a and 2b of the forming plate 3 to change the angle Q formed between them. The difference is that the angle B can be changed.

Incidentally, a hole 6 is also formed in the reinforcing plate 7, and an L-shaped pin is used to connect the upper and lower parts. 10 to 13, a fourth embodiment of the present invention is shown, and the formwork ld of this embodiment is for outside use as in the second embodiment, and the third embodiment Similarly to the embodiment shown in FIG.
2 can be changed.

Therefore, as shown in FIG. 14, a circular concrete wall can be approximately formed by combining a large number of formworks lc and ld. In this case, unlike the case shown in FIG. 5, the angles 8, 82 can be adjusted in response to changes in the number of formworks or the diameter of the circular concrete wall. Although not shown in the drawings, it is clear from the above description that the present invention includes the following embodiments. That is, firstly, the formwork of the present invention can be used not only for circular concrete walls but also for all curved parts of concrete walls such as circular arcs and S-shapes.

Second, in the above embodiments, the flat parts 2a and 2b of the forming plate 3 corresponding to the flat surface of the concrete wall to be formed are 2
However, the forming plate 3 may be configured with three or more pieces.

Thirdly, in the first and second embodiments, the forming plate 3 and the connecting plate 4a,
4b, in the third and fourth embodiments, the flat part 2a of the forming plate 3
, 2b, but these embodiments may be combined to provide elasticity to both.

As described above, according to the present invention, the curved part of the concrete wall to be formed is regarded as a collection of many planes,
Since it has a forming plate consisting of at least two flat parts corresponding to at least two continuous planes and a connecting plate fixed to at least both sides of the forming plate in the crosswise direction, the curved part is eliminated, so assembly is easy. It is easy to use and durable, and can withstand more than 10 uses.

In addition, the flat parts of the forming plates form an angle larger or smaller than 180 degrees with each other, the forming plate and the connecting plate form an angle slightly larger or smaller than 90 degrees, and the flat parts of the forming plates or the forming plate Since one or both of the plate and the joint part has enough elasticity to slightly change the angle formed between them, it is possible to smoothly form a wide variety of approximate curved surfaces that are approximately the same as the curved part of the concrete wall to be formed. be able to. Therefore, formwork costs can be dramatically reduced, especially when forming circular concrete walls such as large manholes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a formwork according to a first embodiment of the invention, FIG. 2 is a plan view of the same, FIG. 3 is a perspective view showing a second embodiment of the invention, and FIG. is a plan view of the same as above, FIG. 5 is a schematic diagram showing an example of use using the formwork of the first embodiment and the formwork of the second embodiment, and FIG. 6 is a third embodiment of the present invention. FIG. 7 is a plan view of the same as above, FIG. 8 and FIG. 9 are plan views showing the main parts of the above, respectively, and FIG. 10 is a fourth embodiment of the present invention. FIG. 11 is a perspective view showing the formwork, FIG. 11 is a plan view of the same as above, FIGS. 12 and 13 are plan views showing the main parts of the above, respectively, and FIG. 4 is a schematic diagram showing an example of use using the formwork shown in FIG. 4. FIG. la, lb, lc, ld...Formwork, 2a, 2b
...Flat portion, 3... Forming plate, 4a, 4
b, 4c, 4d... Combined plate, Q,, Q2...
...Angle between the forming plate and the joining plate, 8. ,32...
...Angle between flat parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Figure 8 Figure 9 Figure 6 Figure 10 Figure 11. Figure 12 Figure 13 Figure 14

Claims (1)

[Scope of Claims] 1. A forming plate that considers the curved surface portion of a concrete wall to be formed as a collection of a large number of planes, and that consists of at least two plane portions corresponding to at least two consecutive planes;
a connecting plate fixed to at least both sides in the lateral direction of the forming plate, the flat parts of the forming plate making an angle slightly larger or smaller than 180 degrees with each other, and the forming plate and the connecting plate The angle is slightly larger or smaller than 90 degrees, and one or both of the flat parts of the forming plates or between the forming plate and the bonding plate has elasticity to the extent that the angle formed by them can be slightly changed. Formwork for forming curved parts of concrete walls. 2. The formwork for forming a curved part of a concrete wall according to claim 1, wherein the width of one flat part is a length approximately equal to a multiple of pi.