JPS6133081Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a formwork suitable for constructing a concrete structure built on a ground with poor conditions such as a slope.

BACKGROUND ART Conventionally, in order to prevent the collapse of earth and sand on slopes, for example, concrete structures in the form of a lattice have been constructed. By the way, in places with such poor footing, it is difficult to perform construction using the same method as on flat land, and the construction costs are enormous. For this reason, simple structures are constructed by spraying mortar over the reinforcing bars placed on the ground to bury them, but such simple structures are insufficient. Since it is not possible to reinforce the ground, it is desirable to construct a strong structure through full-scale construction. However, when assembling frame plates and installing reinforcing bars between the frame plates and spraying concrete or mortar from above, the next fluid is sprayed while the first sprayed concrete or mortar is flowing. Because of this, air gets mixed into the fluid during the process, creating cavities and cavities in the structure when it hardens, which weakens the structure. On the other hand, if the slope is extremely uneven, not only will concrete be wasted, but there is also the risk of creating cavities and nests.

This idea was made in view of the above points, and by constructing the frame plate using a material such as cardboard that is lightweight and inexpensive, yet strong enough to withstand concrete pouring, the frame plate can be used as a single unit or A box-shaped core-like frame is formed by connecting them in series to form an outer frame, or by assembling or foldingly combining the frame plates. The feature is that the tongue-like protrusion is formed, and the frame body is provided with a large number of exhaust holes at predetermined intervals, and it is easy to handle and can be provided at low cost.
To provide a formwork that is disposable after each construction work, is suitable for use in difficult sites with poor footing, and is less likely to form cavities or nests when spraying concrete or mortar. It is.

An embodiment of this invention will be described below with reference to the drawings.

Figures 1 to 2 show the formwork of this invention, where 1 is a band-shaped frame plate which is a constituent member;
A lightweight, inexpensive, and relatively strong material is used, and generally water-resistant, pressure-resistant cardboard, or a paper-based material comparable to these is preferred.

The frame plate 1 produced as described above is cut to the required shape and either formed into an outer frame 16 as shown in FIG. 3, either as a single piece or by connecting several pieces in series, or cut to a specified length, and then folded at required places to join the edges to form a box-like core 17 that can be assembled or folded.
The one shown in Fig. 1 shows a single frame plate, but the one shown in Fig. 2 shows a plate cut in a long state, with fold lines 2 at each required length.
The frame is then folded along the crease, both end edges 3 are joined, and a backing plate 4 is attached from the back and joined with an adhesive or the like to form a box-shaped core. In this embodiment, the end edges 3 are joined at the middle of the frame plates 1 that form each side, but the position is not particularly limited, and both end edges may be joined at the corners. Also, the frame plates 1 may be formed to the size of each side of the box-shaped body, so that they can be assembled together by any suitable means.

The frame plate 1 formed by foldably joining the frame plates 1 is folded along the fold line 2 for transportation, and is used after being unfolded at the site as shown in FIG. 2. Moreover, if the device is designed to be freely assembled, it may be disassembled, transported, and assembled at the site.

For example, a large number of notches 5 are provided in the vertical direction on the lower side of the frame plate 1, and a large number of tongue-like protrusions 6 are provided.
to form. This protrusion may be formed by attaching a plate body, which is separate from the frame body 1 and has a tongue-like protrusion with a large number of cuts etc., along the lower side of the frame plate 1.

In this embodiment, the frame plate 1 is constructed of a plate body folded in two, and a thin wall portion 7 in which one plate body is formed to be longer than the other plate body by a predetermined length.
A protrusion 6 is formed on the frame plate 1, and the protrusion 6 is bendable toward the front side of the frame plate 1. When using a thick frame plate 1, it may be possible to provide a crease on a line connecting the upper ends of the notches 5, if necessary.

Additionally, a large number of exhaust holes 15 are provided between the frame plate 1 and the protrusion 6.
is formed across both.

Note that 8 in the figure is a hole through which a fastening member is inserted when installing the formwork, and is provided at a required location on the frame plate 1.

Next, we will discuss the usage of this devised formwork in the third section.
This will be explained with reference to the figures and FIG.

Structures A installed for protection of natural ground are generally lattice-shaped, and surrounded by the walls of such structures A, many depressions B with rectangular planes are formed. be done. Therefore, the formwork of this invention used to construct structure A also
Outer frame 16 shape or core shape 17 along the wall surface of
It is to be formed. Although the core-shaped thing in the embodiment has a rectangular planar shape, the planar shape of the recessed cavity B is not limited to a rectangular shape. The planar shape of the core is not limited to a rectangular shape, but may be appropriately determined in various shapes that can conform to the shape of the recessed cavity, such as a triangular rhombus or a trapezoid.

To construct the structure A, first, the main reinforcements 9 arranged in the longitudinal direction of the structure on the ground and the hoop reinforcements 10 connecting the main reinforcements 9 are provided, and are appropriately fixed to the ground with anchors. The hoop muscle 10 is made up of several vertical strips 11 and horizontal strips 12 in a parallel grid shape, and the horizontal strips 1
2 is also used for attaching a formwork in place of the conventionally used separator. Therefore, a hook portion 13 and a separator 13a are integrally provided at both ends of the horizontal strip 12. And each hook part 1
3 is inserted into the hole 8 of the formwork 1 provided accordingly, the formwork is attached, and the wedge 14 is fitted into the protruding hook part 13 to tighten the formwork. Further, the separator 13a functions in the same manner as a normal separator, and therefore is not inserted into the hole 8, but abuts against the frame plate 1 to maintain a constant distance between the frame plates.

By the way, the ground on which structures are constructed often cannot be leveled, and therefore construction is carried out on uneven ground. A gap is created between the concrete and the cast concrete, and the poured concrete is washed away. However, in the formwork of this invention, a large number of bendable tongue-like protrusions 6 formed on the lower side of the formwork are formed on the bottom of the formwork. As the formwork bends at the convex part, the lower side of the formwork located in the concave part of the ground also comes into contact with this concave part, and the formwork as a whole adapts to the unevenness of the ground and is grounded. This will prevent concrete from flowing out.

In addition, when spraying concrete or mortar with the formwork attached, the air in the lower layer that is mixed in the sprayed material and is particularly difficult to discharge is passed through the exhaust hole 15 provided at the bottom of the formwork plate to the frame plate. 1, so no cavities or nests are created in the structure A.

After pouring concrete, the formwork may be removed by pulling out the wedge 14, but instead of removing it, mortar or the like may be sprayed over it and embedded. Furthermore, if a paper material such as cardboard is used for the formwork, even if the formwork is left as is, it will naturally rot and disappear. Particularly on slopes, soil is often poured into the hollow space B to carry out greening measures, but in such cases, the formwork must be removed as the soil will be assimilated into the soil. It doesn't look bad if you don't have one. Therefore, in such cases, the cost of removing the formwork can be significantly reduced.

As detailed above, the formwork of this invention uses lightweight materials such as cardboard as the frame plate, so that
These can be used singly or by connecting the required number to form an outer frame, or can be assembled or folded together to form a box-shaped core, so it can be used especially on slopes, etc. It is suitable for constructing reinforced structures, and is extremely easy to transport, install and remove, and the formwork can also be made at low cost.In particular, if it is made of paper, there is no need to dispose of it or remove it each time, making the process easier. This will result in a significant reduction in time and construction costs. In addition, since a number of bendable tongue-shaped protrusions are formed on the lower side of the frame plate, it has the advantage of adapting well to uneven ground, and prevents poured concrete from flowing out from the lower side of the frame plate. can be prevented.
Furthermore, since we have provided a large number of exhaust holes between the frame plate and the protrusion, the air generated during spraying of concrete or mortar can be discharged outside the frame through the exhaust holes. There are no cavities or nests in the mortar.
It has many excellent effects, such as building strong structures.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a perspective view of the frame plate alone, FIG. 2 is a perspective view showing the frame plate formed into a rectangular shape, FIG. 3 is a plan view showing an example of construction, and FIG. 4 is a sectional view thereof. 1...Frame board, 2...Fold line, 4...Passing board, 5...
...notch, 6... tongue-like protrusion, 8... hole, 9...
Main muscle, 10... Hoop muscle, 12... Lateral muscle, 13...
...Hook part, 14...Wedge, 15...Exhaust hole, 16...
Outer frame, 17...core, A...structure, B...concave space.

Claims (1)

[Scope of utility model registration request] A large number of bendable tongue-like protrusions are formed on the lower side of the frame plate made of a lightweight material such as water-resistant and pressure-resistant cardboard, and a large number of exhaust holes are formed astride the frame plate and the tongue-like protrusions. Formwork for constructing concrete structures, characterized by being provided with.