JPS5955943A - Flange trimming and slitting of waist wall and suspended wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing edge cutting system slits for waist walls, hanging walls, etc. of ItC horizontal structures.

In RC structures with waist walls, hanging walls, etc. installed between columns, the actual length of the columns is shortened due to the waist walls, hanging walls, etc., resulting in greater shear force than expected during an earthquake. joins the pillar,
Therefore, the pillars may undergo brittle fracture. For this reason,
In recent years, new earthquake-resistant designs include creating slits at the ends of waist walls and hanging walls to separate them from columns.

However, when forming the slits, there is a problem in how to form them. There is a method using a brick-shaped slit formwork consisting of one method and C. In this method, the formwork is inserted into a concrete casting space formed by a pair of wall formworks, concrete is poured on both sides of the formwork, and after the concrete has hardened, the connecting portion C is pounded with a hammer or the like. This is a method of forming slits by breaking them.

However, this method requires as many slit molds as the number of slits in order to fill the slit molds, which is very expensive.Also, the connecting part C is pounded with a hammer or the like on the inner surface of the slit. Since the surface is uneven and rough because it is formed by breaking, it is important to take measures to stop water.Furthermore, the formwork for slits is heavy, and the formwork for slits can be made depending on the wall thickness and height. The work of cutting the formwork and the work of smashing down the connecting part C are troublesome, and the workability is very poor.

However, if plywood or iron plate is used as the formwork for slits,
The former lacks durability, the latter is heavy, and in both cases the concrete adheres to the mold, making it often impossible to remove the formwork.

The present invention solves these problems at once with a simple configuration, and proposes a slit construction method that is inexpensive, has good workability, and has advantages such as easy water supply measures for the slit.

Therefore, the method of constructing edge cutting slits for waist walls, hanging walls, etc. according to the present invention involves attaching a Styrofoam plate to one side of an iron plate in a concrete casting space formed by a pair of wall forms.
The concrete casting space is divided into left and right by inserting the formed slit formwork, then concrete is poured into these two spaces, and after the concrete hardens, the wall formwork and the slit formwork are removed. The gist is that a slit is formed.

Hereinafter, one embodiment of the construction method of the present invention will be described based on the drawings. Figure 2 shows the construction method for forming slits in the waist wall, where 1 is a column and 2, 2 is a wall formwork made of plywood or the like. Joint bars 4 for holding the slit form 3 are attached to the inner surfaces of the forms 2, 2 with nails or the like. It is desirable that the joint rods 4 and 119 should be placed close to the pillars. This is because it is thought that the closer the slit is formed to the pillar, the more effective the brittle fracture of the pillar will be. The slit formwork 3 is constructed by attaching a foamed polystyrene plate 6 to one side of an iron plate 50, as shown in FIG. It is best to attach the iron plate and the styrofoam board in such a way that they can be easily separated. For example, you can use adhesive, or you can just put the iron plate and the styrofoam board together and attach them around the drawing board with tape. good. Further, the thickness of the slit form 3 is determined depending on the width of the slit. In this case, it is sufficient to use foamed polystyrene plates with different thicknesses, and the iron plate 5 can be used regardless of the size of the slit width.

After the wall reinforcement is arranged, the wall forms 2 and 2 are assembled, and then the slit form 3 is inserted between the joint rods 4..., and the concrete placed by the form 3 is divided by the form 3. Concrete is poured into spaces 7 and 8. Concrete placement for the rain spaces 7 and 8 may be performed from either side first.

For example, it is possible to pour concrete into one space 7 at the same time as the pillar l, and to pour concrete into the other space 8 before pouring the slab concrete for the upper floor.

What is important here is that no matter which space 7 or 8 concrete is poured first, the slit formwork 3 is arranged so that the steel plate 5 faces the space on which concrete will be poured later. 1. This means that even if the lateral pressure of the concrete that has been completely cast in the space on one side acts on the slit formwork, if the slit formwork is inserted in the above direction, the iron plate 5 will not move as far as the joint bar 4... This is because the lateral pressure can be counteracted by direct contact with the lateral pressure.

In the state where the frames 2 and 2 are removed, the slit form 3
The slit formwork 3 can be easily removed by hitting the iron plate 5 at these protruding parts from the side.
However, since the Styrofoam plate 6 on one side of the iron plate 5 can be elastically deformed in the thickness direction, when the iron plate 5 is struck from the side, the iron plate 5 easily separates from the concrete. It can peel off. still,
In many cases, only the iron plate 5 is removed first, and the Styrofoam plate 6 remains in the slit, but the Styrofoam plate 6 has weak mechanical strength and can be easily scraped out. If necessary, the polystyrene foam plate 6 can be dissolved away using a solvent such as thinner.

Through the above steps, a slit with a predetermined width and a smooth inner surface can be formed at the location where the slit mold 3 was present.

Since the method of constructing edge cutting slits for membrane walls, hanging walls, etc. according to the present invention is carried out as described above, it has the following effects.

Since the formwork for the slits is constructed by attaching a styrofoam plate to an iron plate, the formwork can be easily removed, and at least the iron plate can be reused many times, allowing for effective use of materials.

■ Steel plates and foamed polystyrene plates are both easily available and easy to process, so slitting formwork can be constructed at low cost, and dimensions of slitting formwork can be easily adjusted, resulting in significant operational benefits on site. Hey. Furthermore, the slitting form is lightweight and low in bulk, making it very easy to handle and transport. In particular, the work of setting the slit formwork in the concrete casting space can be carried out by a single person, and together with the advantage (2), ease of construction is ensured.

■ Since edge-cutting slits are formed by removing the slit formwork, the inner surface of the slit can be made smooth, unlike the method of filling the slit, making it extremely easy to implement water-stopping measures for secondary harps, etc. .

The edge cutting υ slit construction method according to the present invention is not only effective for cutting edges between waist walls, hanging walls, and columns, but also for cutting edges between walls (blind tests) and columns in J4 high-rise buildings. It can also be applied to cutting.Also, in the previously described embodiments, the slit form is constructed by attaching a Styrofoam plate to one side of a single iron plate, but it is possible to form a Styrofoam plate with two iron plates. It is also possible to use a Zandherch (i) configuration. In this case, concrete may be poured from either the left or right side of the slit formwork.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional slit mold, FIGS. 2 and 3 show an embodiment of the present invention, FIG. 2 is a perspective view of the slit mold in an assembled state, and FIG. The figure is a configuration diagram of a slit mold. ■...Column, 2...Wall frame, 3...Slit formwork, 5...Iron plate, 6...Styrofoam board, 7, 8...
...Concrete pouring space.

Claims (1)

[Claims] A slit form made of a styrofoam plate attached to one side of an iron plate is inserted into the concrete casting space formed by a pair of wall forms to divide the concrete casting space into left and right sides. A method for constructing edge-cutting slits for waist walls, hanging walls, etc., characterized by pouring concrete into a space and, after the concrete hardens, removing wall formwork and slit formwork to form slits.