JPH0413123Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to an inner mold for a formwork for mass producing concrete products having a gate-shaped cross section for use in side gutters, etc.

<<Prior Art>> In a concrete product 30 with a cross section as shown in FIG. 6, which is widely used as a so-called variable slope type gutter, the inner surfaces of the opposing side walls 31 are both formed vertically, resulting in a so-called draft slope of the inner mold. Since there is no inner mold, the problem is how to remove the inner mold. FIG. 7 is a schematic sectional view showing an example of a conventional inner mold, in which 30 is a concrete product, 40
41 is an inner mold side plate portion, and 42 is a turnbuckle. The inner mold 40 has a U-shaped cross section, and is connected by upper turnbuckles 42 of left and right side plate parts 41. To remove the inner mold, rotate the turnbuckle 42 to tilt the left and right side plates inward to form a gap with the concrete product as shown in Figure 7, and then move the inner mold upward. This was done by hoisting it up.

<<Problems to be solved by the invention>> The above-mentioned conventional inner mold requires a step of rotating the turnbuckle to tilt or raise the side plate part when demolding or conversely assembling, which is inefficient. . Furthermore, when pouring concrete into the formwork, the concrete easily penetrates into the inner mold, requiring great care when pouring the concrete, and the effort required to clean up the concrete that has entered the inner mold can be significant. Ta.

The present invention solves these problems, streamlines the demolding and assembly work of the inner mold, and completely prevents concrete from entering the inner mold, making it easier to pour concrete and remove the inner mold. This provides an inner mold that greatly reduces cleaning work.

<Means for Solving the Problems> The present invention has an inner mold formed into a substantially rectangular cylindrical shape with two opposing side plate parts 2a and 2b, a top plate part 3, and a bottom plate part 4. It consists of two parts vertically divided along the direction, and the bottom plate half of each part 4
By closely contacting each end of the deformable band 5 made of an elastic material such as rubber to the inner end of each bottom plate half 4a, 4b.
The space between the parts is closed by a deformable band 5, and each part is connected to each other by arms 8 pivoted near both ends, and at least one pair of pivot shafts at both ends are connected by a connecting shaft 9. The arm 8 rotates by the same amount, and when the arm 8 rotates by a certain amount, the arm 8 comes into contact with a plate-shaped or rod-shaped stopper 11 fixed near the arm 8, thereby limiting the amount of rotation of the arm 8. This is the inner mold of the characteristic formwork for forming concrete products.

<<Operation>> The inner mold of the present invention is formed into a cylindrical shape by two parts, and the space between the bottom plate halves of each part is closed with a deformable band made of an elastic material such as rubber, so that the concrete does not flow inside the inner mold. There is no risk of it getting inside. In addition, the vertically divided parts are interconnected by arms pivoted near both ends, and one part can rotate around the other part by a certain angle via the arms, so the inner mold When demolding, by lifting one of the appropriate parts, that part moves upward in a circular orbit and at the same time moves inward, narrowing the width of the inner mold and creating a gap between it and the concrete product. This allows the inner mold to be easily demolded. When assembling the formwork, by suspending the inner mold into the outer mold, the operation is completely opposite to that for demolding, and the inner mold is easily set into the outer mold. Furthermore, since at least one pair of pivot shafts of the arms at both ends are connected by a connecting shaft, when demolding or assembling the inner mold, the arms at both ends always rotate by the same angle, and the two parts are always parallel. Moving. The inner mold of the present invention is extremely disadvantageous in terms of strength because the entire mold is divided vertically into two and a deformable band is employed. However, the rigidity of the connecting shaft prevents the inner mold from becoming distorted due to stress generated during work or the pressure of poured concrete.

Further, when the inner mold of the present invention is suspended in the state shown in FIG. 3 during demolding, the stoppers stop the rotation of the arms, thereby preventing load from being applied to the deformation band. If there was no stopper, the entire load of part B would be applied to the deformation band, and it would break immediately.

<<Example>> Hereinafter, the present invention will be explained in more detail by way of an example with reference to the drawings.

FIG. 1 is a perspective view of an inner mold 1 and an outer mold 21 used together with the inner mold 1 according to an embodiment of the present invention, FIG. 2 is a front view showing the inner mold 1 set in the outer mold 21, and FIG. FIG. 4 is an enlarged view of the vicinity of the deformation zone 5 in FIG. 3, and FIG. 5 is a cross-section showing the right half of the section taken along the line X-X in FIG. 2, with the right half omitted. FIG. 6 is a perspective view of the concrete product.

As shown in FIG.
side plate parts 2a, 2b, top plate part 3 and bottom plate part 4
It is formed into a substantially rectangular cylindrical shape and is placed inside the outer mold 21. The outer mold 21 is formed into a substantially box-like shape by a bottom plate 24, opposing side plates 22, and end plates 23, and the side plates and end plates are attached to a base 25 with hinges 27, and can be opened to the outside when demolding. Also,
As shown in FIG. 1, the end plate 23 is formed with a U-shaped cutout having the same external dimensions as the inner mold 1.
Both ends of are fitted into this notch.

The inner mold 1 is vertically divided into two parts along its length. That is, the upper plate portion 3 is p
The bottom plate part 4 is divided at q and q', and if the left side is the A part and the right side is the B part in Figures 1 to 3, the upper plate half 3a of the A part is the same part 3 of the B part.
It is divided so that the width is wider than b. Therefore, by providing a hanging ring 7 on the upper surface of the upper plate half 3a of part A at a position approximately in the center of the width of the inner mold, and lifting the inner mold with this, the inner mold can be lifted in an extremely well-balanced manner.

As shown in Fig. 2, there is a slight gap between the inner ends q and q' of the bottom plate halves 4a and 4b of each part A and B, and this gap is completely filled by the deformable band 5 made of band-shaped rubber. It's blocked. The inner ends q, q' of the bottom plate halves 4a, 4b are formed in a step shape, and the end of the deformation band 5 is formed in an inverse step shape to match the inner ends q, q' of the bottom plate halves 4a, 4b. By pressing down with 6b bolts 7a and 7b, each end of the deformable band 5 is brought into close contact with q and q'. The method of attaching the deformable band 5 is not limited to this method, and it may also be bonded with an adhesive, for example.

As shown in FIG. 1, support plates 13a and 13b are fixed near both ends of each part A and B, and one end of each arm 8 is pivotally attached to both support plates, so that both parts can be attached to each other. is connected to. That is, one end of the arm 8 is rotatably attached to the support plate 13a of the A part about a fulcrum 8a, and the other end is rotatably attached to the support plate 13b of the B part about a fulcrum 8b. Although the right half of FIG. 5 is omitted due to bilateral symmetry, the pivoting at the fulcrum 8b is achieved by pivoting both ends of the connecting shaft 9 to the support plate 13b, as shown in the figure.
Furthermore, this is achieved by fixing the arm 8 to the outside thereof. Therefore, during demolding, etc., the arms on both sides always rotate by the same angle, and parts A and B move completely in parallel. As shown in FIG. 2, the arm 8 is inclined with the fulcrum 8a on the A part side being provided above the fulcrum 8b on the B part side. This is because when part A is lifted up during demolding, the direction in which part A begins to move is at right angles to arm 8, that is, in the direction of arrow Y. Therefore, if the arm is set at an angle, part A becomes a concrete product from the beginning. This is because the mold begins to move in a direction that creates a gap between them, allowing for extremely smooth demolding. For the same reason, the cut point of p is set at a slightly larger angle than the angle of arrow Y. The number of arms is preferably about two on each side as in this embodiment, but is not limited to this.

Concrete is poured from above as shown in Figure 2. At this time, since the inner mold 1 is formed into a cylindrical shape, concrete cannot penetrate into the inner mold, and the work efficiency is extremely improved. If the upper plate part 3 is formed into a chevron shape as in this embodiment, the work will be made more efficient, and if the rubber gasket 14 is embedded in the cut part p, the sealing performance will be further improved.

The inner mold 1 is removed after the concrete has hardened.
From the state shown in Figure 2, insert the fixing bolt 26 into the bolt receiver 12.
, connect the crane hook to the hanging ring 10 and lift it up. Part A then begins to move in the direction of arrow Y, moving upward in a circular orbit and at the same time moving inward, causing the width of the inner mold to shrink and creating a gap between it and the concrete product, as shown in Figure 3. As a result, the inner mold can be easily pulled upwards. At this time, the deformation band 5 is deformed as shown in FIGS. 3 and 4 due to the relative movement of parts A and B.
It is desirable that this relative movement be stopped to such an extent that no burden is placed on the deformation band 5. In the case of this example,
A stopper 11 is provided on the support plate 13b, and as shown in FIG. 3, when the lower arm 8 comes into contact with the stopper 11, relative movement is stopped. When setting the inner mold 1, place the assembled outer mold 21 in the lifted state as shown in Figure 3.
All you have to do is hang it inside, and fix it with the fixing bolt 26 to get the state shown in Figure 2.

《Effects of the invention》 The inner mold of the present invention automatically reduces its width or restores its width by lifting or lowering it during demolding and assembly, and there is no need for the work of rotating the turnbuckle as in the past. Streamline mold assembly work. In addition, the inner mold of this invention is formed into a cylindrical shape, and the bottom plate part where the concrete pressure is greatest and where concrete easily invades is connected by a deformable band, so concrete is not allowed to enter the interior and concrete is poured. This will greatly reduce the work and cleaning work of the inner mold. The two parts of the inner mold are always kept parallel and do not warp, so they are less likely to be damaged during demolding and reassembly, resulting in excellent durability and superior precision in the molded concrete products.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an inner mold 1 and an outer mold 21 used together with the inner mold 1 according to an embodiment of the present invention, FIG. 2 is a front view showing the inner mold 1 set in the outer mold 21, and FIG. 4 is an enlarged view of the vicinity of the deformation zone 5 in FIG. 3; FIG. 5 is a sectional view taken along line X-X in FIG. 2 with the right half omitted; Figure 6 is a perspective view of the concrete product, Figure 7
The figure is a schematic sectional view showing an example of a conventional inner mold. 1...Inner mold, 2a, 2b...Side plate, 3...Top plate part, 3a, 3b...Top plate half part, 4...Bottom plate part, 4
a, 4b... Bottom plate half, 5... Deformation band, 6a, 6
b...Press plate, 7a, 7b...Bolt, 8...Arm,
9...Shaft, 10...Hanging ring, 11...Stopper,
12... Bolt receiver, 13a, 13b... Support plate,
21...External mold, 30...Concrete product, 40
...Inner mold, 41...Side plate part, 42...Turnbuckle.

Claims (1)

[Claims for Utility Model Registration] (1) An inner mold formed into a substantially rectangular cylindrical shape with two opposing side plates 2a and 2b, a top plate 3 and a bottom plate 4, which extend along the length direction. 2 vertically divided
Consisting of 4 parts, the bottom plate half of each part 4
A deformable band 5 made of an elastic material such as rubber at the inner end of a, 4b
By closely contacting each end of each bottom plate half 4a,
4b is closed by a deformable band 5, and each part is connected to each other by an arm 8 pivotally attached near both ends, and at least one set of pivot shafts at both ends are connected by a connecting shaft 9. The arm 8 rotates by the same amount, and when the arm 8 rotates by a certain amount, a plate-shaped or rod-shaped stopper 1 fixed near the arm 8
1. An inner mold for a formwork for forming a concrete product, characterized in that the amount of rotation of the arm 8 is limited by the arm 8 coming into contact with the inner mold. (2) One of the two parts (A part) has a wide upper plate half 3a, and the other (B part)
The inner mold for a formwork for forming a concrete product according to claim 1, which is a registered utility model, is divided into a narrow upper plate half 3b, and a suspension ring 10 is provided on the upper surface of the upper plate half 3a of part A. (3) The mold for forming a concrete product according to claim 1 or 2 of the utility model registration claim, in which the fulcrum 8a on the A part side of the arm 8 is provided above the fulcrum 8b on the B part side, and the arm 8 is inclined. The inner mold of the frame.