JPH0446890Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an inner formwork for forming a hollow part of a concrete hollow body such as a concrete hollow column.

[Conventional technology]

In general, the inner formwork that forms a concrete hollow body is made of plywood or corrugated paper. (see figure).

The above-mentioned inner formwork includes a core plate 32 having a plurality of slots 31 formed on its outer periphery, a core plate 32 that can be wound outwardly along the outer periphery of the core plate 32, and insertion slots 33 arranged at regular intervals in the longitudinal direction of both ends. Both ends of the outer winding plates 34 and 35 are fitted into the slots 31 of the core plate 32 to form a structure.

However, this inner formwork, as shown in Figure 9,
Only the outer peripheral edge portion of the core plate 32 is the outer winding plate 34, 35.
When the core plate 32 is inserted into the core plate, the central portion thereof is not supported, which causes the core plate 32 to easily deform, resulting in a problem that the pressure-resistant structure is insufficient.

Also, when assembling the inner formwork mentioned above,
First, one slot 31 in each of the many core plates 32 is inserted into the insertion slot 3 at one end of the outer winding plate 34 or the outer winding plate 35.
Insert into 3. At this time, the slot 31 of the core plate 32 is
Since the groove is formed with a width corresponding to the thickness of two outer winding plates 34 and 35, each core plate 32 is completely inserted by inserting one outer winding plate 34 or 35. It cannot be fixed. Therefore, next, the outer winding plate 34,
In order to insert the large number of insertion slots 33 at the other end of the core plate 35 into the slots 31 of the same number of core plates 32 at different locations, it is necessary to hold down the easily swingable core plate 32 by hand. . In other words, the above-mentioned conventional inner formwork has a structure that cannot be assembled unless a large number of fitting parts of the outer winding plate are fitted to a large number of unfixed core plates at the same time, and the assembly is extremely complicated and has poor workability. It was hot.

[The problem that the idea aims to solve]

The object of this invention is to solve the above-mentioned drawbacks of the conventional inner formwork, improve the pressure-resistant structure of the inner formwork for forming the hollow part of a hollow concrete body, and improve the workability of assembly.

[Means to solve the problem]

In order to solve the above problem, in this invention, slits are formed in the longitudinal direction of a plurality of rectangular corrugated cardboard tubes, extending at intervals across one side wall and extending to the other adjacent side wall. The slits of the slits are aligned with each other, and a partition plate having a groove formed in the outer edge capable of holding the two adjacent side walls is inserted into the slits of a plurality of adjacent rectangular cylinders.

Further, the partition plate may have a plurality of slots and may be arranged so that the slots are inserted into the slits in different directions.

Or, in the longitudinal direction of a double-sided rectangular cardboard box,
A slit is formed which crosses the side wall located at one end of the body intermediate wall at intervals by a length corresponding to the width dimension of the twin body and extends in the body intermediate wall, and the body intermediate wall is inserted into the slit. It is also possible to adopt a structure in which a partition plate having a slot on its outer edge that can be gripped is inserted.

[Effect]

The inner formwork for forming the hollow part of the concrete hollow body of this invention, which is constructed as described above, can be used by simply inserting the partition plate into the slit of the adjacent rectangular cylinder.
The side walls of adjacent rectangular cylinders are fitted into the slots of the partition plate in an interlocking manner to connect the adjacent rectangular cylinders, and the rectangular cylinders are kept in a constant shape by the partition plate. Therefore, assembly work is simplified. In addition, when a plurality of slots are formed on the outer edge of the partition plate in different insertion directions, when one slot is inserted into one set of rectangular cylinders, this partition plate will sandwich the two adjacent side walls. Then, the slit of another rectangular tube body set and the slot thereof can be easily inserted. In addition, when the partition plate is inserted into the slit of the double-bodied rectangular tube, the middle wall of the body is held and the side walls of the twin-hull are kept in shape, which saves the work of connecting multiple rectangular tubes. This further simplifies assembly work.

〔Example〕

The first embodiment of this invention is shown below in Figures 1 to 4.
This will be explained based on the diagram.

As shown in FIGS. 1 and 2, the inner formwork for forming the hollow part of the concrete hollow body consists of a rectangular cylinder 2b made of corrugated cardboard and having a slit 1 that crosses one side wall and extends to the other side wall; 2d, and partition plates 4b and 4d having a single slot 3 opened on the outer edge.
The square cylinder body 2 is separated by the partition plates 4b and 4d.
When two of each of b and 2d are connected, it consists of a square cylinder set 2b, 2b and an exterior plate 5 that wraps around the square cylinder set 2d, 2d.

As shown in Fig. 3b, d, square cylinder bodies 2b, 2d
Blanks B and D are made by setting the length in the vertical direction in the figure to the required length of the inner formwork, arranging the core 8 in the horizontal direction in the figure, forming a plurality of folds 6 in the length direction, and , a stacked piece 7 is provided on one side end, and is bent along the fold line 6 to form a pentagonal cylinder and a quadrangular cylinder, respectively. Slit 1a
crosses one side wall 9 of the blank and overlaps the overlapped piece 7
The blank is formed to extend by a certain length across the blank, and an open slit 1b is provided at the other end of the blank. Square cylinder body set 2b, 2b or square cylinder body set 2 assembled by the above two types of slits
A series of slits 1 are formed across one side wall 9 and the other side wall 10 of d and 2d.

In addition, as shown in FIGS. 3c and 3e, the partition plates 4b,
4d is a polygonal corrugated board formed to correspond to the internal shape of the respective connected sets of the rectangular cylinders 2b and 2d, and has a single slot 3 opened at the outer edge, the width of which is the same as that of the blank. It is formed to have a width that can hold approximately four sheets. As shown in the figure, this slot 3 is configured so that the direction of the core 8 is aligned with the width direction of the slot so that the above-mentioned clamping force can be effectively exerted. Furthermore, since the length of the slot 3 is made to match the constant width from the deepest end of the open slit 1b of the blanks B and D to the fold 6, the length of the slot 1 and the slot 3
In the state in which the partition plates 4b and 4d are engaged with each other, the partition plates 4b and 4d are fitted into the rectangular cylinder body sets 2b and 2b and the rectangular cylinder body sets 2d and 2d in an aligned state.

As shown in FIG. 3a, square cylinder body sets 2b, 2b,
The blank A of the exterior plate 5 that wraps around the square tube assembly 2d, 2d forms a fold 11 parallel to the longitudinal direction, with the width of each side wall to be exteriorized and the width of the side end 12 used for insertion. However, the center core 8 is arranged in the same direction. As shown in FIG. 2, this exterior plate 5 is usually arranged in two pieces, extending over two sets of rectangular cylinder bodies 2b, 2b and 2d, 2d, which are connected by two partition plates 4b, 4d. Of course, it is possible to cover the entire circumference with one sheet.

The above embodiment configured in this manner is assembled and used as follows.

The rectangular cylinders 2b and 2d are prepared in advance in a flat shape according to their shape so that they can be easily transported or stored, and are bent and formed into the rectangular cylinder shape as appropriate. Then, the side walls 10 sides of the slit 1 are aligned with each other.
Each rectangular cylinder 2b, 2b or 2d, 2d,
The partition plates 4b and 4d are fitted and connected one by one from one side, and the two sets are placed back to back and adjacent to each other, and the side ends 12 of the two exterior plates 5 are connected to the rectangular cylinders 2b and 2d, respectively. It is bent and inserted into the gap between the side surfaces to form the assembled formwork as shown in FIG. Furthermore, it goes without saying that the rectangular tube bodies 2b, 2b or the rectangular tube bodies 2d, 2d can be used as the inner formwork, respectively.

In addition, by fixing cardboard (not shown) that covers the entire length of both ends of the inner form with tape 15 or covering it with a film, it is possible to reliably prevent raw concrete from entering from both ends.
For example, it goes without saying that it is preferable to make the cardboard material itself water repellent.

Next, as shown in FIG. 4, an inner formwork is installed inside the outer formwork 14 of the concrete hollow body 13 in which the hollow part is to be formed, and fresh concrete is filled around it. A body 13 is formed.

In addition, the second embodiment shown in FIG.
Partition plates 4e and 4f are respectively fitted and connected to f and 2d. In this case, the slits 1 in the middle rectangular cylinders 2e and 2f are formed across one side and across three sides, and two slots 3 parallel to each other are also formed in the partition plates 4e and 4f. ing. In this way, the inner diameter of the inner mold can be increased, and the inner mold can be formed in a wide variety of shapes.

A third embodiment of this invention will be described below based on FIG. 6.

Note that the same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted hereinafter.

As shown in FIG. 6, in the third embodiment, the partition plate 4
Two slots 3a and 3b are formed at opposing positions on the outer edge of g. That is, the partition plate 4g is made of corrugated paper with a substantially heptagonal shape corresponding to the cross-sectional shape when the square cylinder body sets 2b, 2b and the square cylinder body sets 2d, 2d are connected, and has two slots. 3b,
3a is formed with a groove width (that is, a thickness of four blanks) capable of holding the two adjacent side walls 10 of the rectangular cylinder body sets 2b, 2b or the rectangular cylinder body sets 2d, 2d, respectively.

An embodiment including such a partition plate 4g is assembled as follows.

First, the same number of slots 3a of the partition plate 4g are sequentially inserted into the many slits 1 of the square cylinder assembly 2d, 2d, so that the slots 3a sandwich the adjacent side walls 10. Insert into. At this time,
The slot 3b side of the partition plate 4g has square cylinder body sets 2d, 2d.
It is fixed in a state protruding outward from one side wall 9 of. Next, separately combined square cylinder body assembly 2
This slit 1 is added to the many slits 1 of b and 2b.
The partition plates 4g fixed at the same intervals are inserted and the adjacent side walls 10 are sandwiched between the slots 3b. Further, two exterior plates 5 are wrapped around each other to ensure the connection between the square tube bodies 2b, 2b and the square tube bodies 2d, 2d.

In this way, two sets of rectangular cylinder bodies 2b, 2b
2d and 2d are connected by a common partition plate 4g, and the sets of rectangular tube bodies are securely fixed to each other, and the center of the partition plate is also reinforced, and the ease of assembly work is not lost.

As shown in FIG. 7, in the fourth embodiment of this invention, a body intermediate wall 20 is formed at regular intervals in the longitudinal direction of a double body rectangular cylinder 20 made by bending and molding a piece of cardboard.
A slit 24 of a constant length is formed across the side walls 22 and 23 located at one end of the body by a length corresponding to the width w of the twin body, and extends to the body intermediate wall 21. A partition plate 4a having a slot 3 on its outer edge that can be held in place is inserted into the partition plate 4a.
The slit 24 described above is located on the side wall 25 located on the other end side of the trunk intermediate wall 21 as shown by the chain line in FIG.
In that case, the slots 3 of the partition plate 4a are also arranged as shown by chain lines in the same figure.

In this way, the double-bodied rectangular cylinder formed from a single sheet of cardboard does not require connecting each rectangular cylinder as in the first embodiment, and the assembly work becomes easier.

〔effect〕

As is clear from the above explanation, the inner formwork for forming the hollow part of a concrete hollow body of this invention can be used to connect and fix multiple rectangular cylinders by inserting partition plates into the slits of the corrugated rectangular cylinders. Since the shape of the rectangular cylinder body is maintained, there is no need to simultaneously fit multiple partition plates to multiple fitting points on the rectangular cylinder body, and the partition plates are fixed at that time, making assembly extremely easy. This has the advantage of being easy, preventing deformation of the core plate, and improving the pressure-resistant structure.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of this invention, Figure 1 is a perspective view, Figure 2 is an exploded perspective view showing an assembled state, Figure 3 is a developed view of Figure 1, and Figure 4 is a perspective view of the invention. The figure is a cross-sectional view of the state buried in concrete.
The figure is an exploded perspective view showing the second embodiment, and Figure 6 is the third embodiment.
FIG. 7 is an exploded perspective view of the fourth embodiment, FIGS. 8 and 9 show the conventional example, and FIG.
The figure is an exploded perspective view showing an assembled state, and FIG. 9 is a cross-sectional view. 1, 24...Slit, 2b, 2d, 2e, 2
f... Square cylinder, 3, 3a, 3b... Slot hole, 4a,
4b, 4d, 4e, 4f, 4g... partition plate, 5...
...Exterior board, 9...One side wall, 10...Other side wall, 1
3...Concrete hollow body, 20...Twin body rectangular cylinder, 21...Body intermediate wall, 22, 23, 25...
side wall.

Claims (1)

[Claims for Utility Model Registration] (1) Slits are formed in the longitudinal direction of a plurality of rectangular corrugated cardboard tubes at intervals, crossing one side wall and extending to the other adjacent side wall. An inner mold for forming a hollow part of a concrete hollow body, which is formed by fitting a partition plate having a slot on the outer edge into the slits of a plurality of adjacent rectangular cylinders so that the slits coincide with each other and forming grooves that can hold the two adjacent side walls. frame. (2) The inner formwork for forming a hollow part of a concrete hollow body according to claim 1, wherein the partition plate has a plurality of slots, and the slots are arranged so that the directions of insertion into the slits are different. (3) In the longitudinal direction of the corrugated double-bodied rectangular cylinder, cross the side wall located at one end of the body intermediate wall at intervals by a length corresponding to the width of the twin body, and cross this body intermediate wall. An inner formwork for forming a hollow part of a concrete hollow body, which is formed by forming an extending slit, and inserting into the slit a partition plate having a groove formed at the outer edge to be able to clamp the intermediate wall of the body part.