JPH1193411A - Forming method for opening using form opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To removably mount a form for opening simply on a film without direct attachment to the film even in case the opening is formed in a place on the film apart from the ground. SOLUTION: A closed space 18 is formed inside a film 16, and compressed air is supplied to the space 18 so that the film is inflated, and to its outside, concrete is sprayed so that a ceiling wall 8 is constructed. A form 20 for opening is placed before the concrete is sprayed, and the spray of concrete is applied to the area elsewhere than the area where the form 20 is placed, and the first layer of concrete 22 is formed, whereon reinforcing bars 24 are laid. The form 20 is coupled with the part with these bars 24 by bundling wires 28 and secured onto the film 16. Then concrete is sprayed to form ceiling wall 8, and after hardening, the wires 28 are cut, and the form 20 is removed from the ceiling wall 8, and thus the intended opening 14 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an opening in a concrete wall when the concrete wall is constructed by spraying concrete on the outside of a membrane.
More particularly, the present invention relates to a method of mounting an opening form for forming an opening on a membrane.

[0002]

2. Description of the Related Art A closed space is formed inside a membrane by expanding the membrane, and a predetermined pressure is applied to the inside of the closed space so as to expand to a predetermined shape.
Or mortar) is sprayed to form a concrete wall, and this concrete wall can be used to construct a concrete structure.
Since it is possible to shorten the construction period and reduce costs, it is being adopted when constructing various storage tanks and the like.
In a structure including such a concrete wall, for example, an opening such as an entrance is formed at a lower portion of the concrete wall. The opening is formed by fixing the opening formwork to the outside of the membrane so that the concrete is not sprayed on this portion, and after the concrete is hardened, the opening formwork is removed from the concrete wall. .

[0003]

However, when it is formed at the lower part of a concrete wall, such as at an entrance, no problem arises because the opening form can be fixed on the ground. In the case where an opening is formed at a location, for example, at the top of a hemispherical concrete wall that is convex upward, since the opening form is separated from the ground, it is possible to fix the opening form via the ground. Can not. In such a case, it is conceivable to attach and fix the opening form directly to the membrane, but in this type of concrete structure, the membrane is often removed from the concrete wall after the completion of the concrete structure. If the forming form is directly attached to and fixed to the membrane, the work of removing the opening form and the membrane from the concrete wall is extremely troublesome. The present invention has been devised in view of the above circumstances, the object of the present invention,
Even if you make an opening in the membrane part away from the ground,
An object of the present invention is to provide a method of forming an opening using an opening mold that can easily attach and detach the opening mold on the film without directly attaching to the film.

[0004]

In order to achieve the above-mentioned object, the present invention provides a method for producing a closed space inside a membrane by expanding the membrane.
A predetermined pressure is applied to the inside of the closed space to inflate the membrane into a predetermined shape, a mold for opening is arranged outside the inflated membrane, and concrete is sprayed on the outside of the membrane, and after the concrete is hardened, When removing the opening form and constructing a concrete wall having an opening, concrete is sprayed on the outside of the film body except for a portion where the opening is formed outside the inflated film body by a predetermined thickness. Forming a first concrete layer, then arranging a reinforcing bar on the first concrete layer, and using the reinforcing bar to place the opening form at a predetermined position outside the membrane; After fixing, the concrete was sprayed on the first concrete layer and around the opening formwork, and the reinforcement was arranged on the first concrete layer and the first concrete layer. Rebar and these A concrete wall was formed from the concrete sprayed on the concrete wall, and after the blown concrete was hardened, the opening form was removed from the concrete wall to form an opening in the portion where the opening form was attached. Features. Further, in the present invention, the film body may be pre-printed with a location where an opening formwork is to be attached, and before the concrete for forming the first concrete layer is sprayed on the film body, It is characterized in that the opening formwork is placed on the ink spot on the body. Further, the present invention is characterized in that the opening form is fixed to the outside of the film body by a binding wire bridged between the reinforcing bar and the opening form. Further, the present invention is characterized in that when the opening formwork is removed from the concrete wall after the concrete has hardened, the film body is also removed from the concrete wall.

[0005] In the present invention, since the opening formwork is fixed on the membrane using the reinforcing bar provided on the concrete wall, even when the opening is formed in the concrete wall portion remote from the ground. , Without attaching directly to the membrane
Also, without the need for a support member erected from the ground,
The opening form can be easily fixed, and the opening form can be easily removed without damaging the film because it is not directly attached to the membrane.

[0006]

Next, an embodiment of the present invention will be described. 1 is a sectional front view of a storage tank, FIG.
3A and 3B are cross-sectional views of the center of the ceiling wall, and FIG. 3 is a plan view of the center of the ceiling wall. In the present embodiment, the concrete structure to which the present invention is applied is the storage tank 2, and the storage tank 2 includes a side wall 6 erected in a plan view from a disk-shaped bottom 4 and a side wall 6. An upper end is provided with a ceiling wall 8 formed in an upwardly convex spherical shape, and a lightning rod device 12 is provided at the center of the ceiling wall 8, and the lightning rod device 12 is provided with an opening 14 formed at the center of the ceiling wall 8. Is installed through. The side wall 6 is formed by assembling a concrete formwork and casting concrete into the concrete formwork. The ceiling wall 8 is formed by airtightly attaching the outer edge of the film body 16 to the upper end of the side wall 6 so that
A closed space 18 is formed thereon, and compressed air is supplied to the closed space 18 to inflate the membrane 16, and the concrete (outside the membrane 16) is kept outside the membrane 16 while maintaining the pressure in the closed space 18 at a predetermined value.
Or mortar) and is formed by this sprayed concrete. When the ceiling wall 8 is formed, the opening 14 is also formed at the same time.

The procedure for forming the ceiling wall 8 and the opening 14 will be described in detail with reference to FIGS. The opening 1
4 is formed using the opening form 20. In the present embodiment, the opening 14 has a square shape in a plan view.
Plywood square bottom plate 2004 and 4 of bottom plate 2004
It has a square frame shape whose upper part is open from four side plate parts 2002 rising from the sides. The location where the opening form 20 is attached (in this embodiment, the center of the ceiling wall 8) is previously blackened on the film body 16, and after the film body 16 is expanded into a spherical shape, concrete is removed. Before being sprayed, the opening mold 20 is placed on the blackened portion of the film body 16.

Next, as shown in FIG. 2 (A), concrete (or a concrete work or a work vehicle) is used on the outside (upper surface) of the film body 16 excluding the portion where the opening form 20 is placed. (Mortar) is sprayed to form a first concrete layer 22 having a predetermined thickness on the outside of the film body 16. Next, the film body 1
On the first concrete layer 22 excluding the center of the film body 6, a plurality of rings are formed radially from the center of the film body 16, and so as to form a plurality of rings coaxial with the center of the film body 16 and different in radius. In FIG. 2, reference numeral 26 denotes a die for securing a gap between the first concrete layer 22 and the reinforcing bar 24.

Next, the opening form 20 and the portion of the reinforcing bar 24 located near the center of the film body 16 are connected using a binding wire 28 such as a wire, for example. Is fixed to the center of the film body 16. In this case, the opening formwork 2
0 is sprayed around the periphery of the opening form 20 so that the blown concrete does not move the opening formwork 20 and the concrete does not enter the lower surface of the bottom plate portion 2004 of the opening formwork 20. Formwork 2
In a state in which the lower surface of the opening 0 is in close contact with the film body 16, the binding lines 28 are tied together, or the binding lines 28 are adhered to the opening form 20 using an adhesive, so that the opening form 20 is horizontal. Secure so that it cannot move in the direction.

Next, as shown in FIG. 2 (B), on the first concrete layer 22 and the reinforcing bars 24 arranged, and on the membrane 16 around the opening formwork 20, that is, Then, concrete (or mortar) is sprayed on the entire area except for the opening formwork 20 using a high-altitude work vehicle or the like to form a second concrete layer 30, whereby the ceiling wall 8 is formed.
Is formed. It is optional to arrange the reinforcing bars 24 on the second concrete layer 30 in the same manner as described above and form the third concrete layer or the fourth concrete layer to form the ceiling wall 8. It is.

Next, when the blown concrete has hardened, the binding wire 28 is cut and the opening form 20 is cut.
Is removed from the ceiling wall 8. In this case, when the connecting portion between the binding wire 28 and the opening form 20 is located inside the opening form 20, that is, on the inner side of the side plate portion 2002, the concrete is sprayed. The binding wire 28 can be easily broken in a wide space inside the opening mold 20 that has not been provided, and the opening mold 20 can be more easily removed. Then, by removing the opening formwork 20,
An opening 14 is formed at the place where the opening formwork 20 was located, and the lightning arrester device 12 is attached and fixed to the opening 14.

According to the present embodiment, since the opening form 20 is fixed on the film body 16 by using the reinforcing bar 24 provided on the ceiling wall 8, it is separated from the ground as in the embodiment. Even when the opening 14 is formed in the center of the upper end of the ceiling wall 8, the opening form 2 is not attached to the film body 16 and does not require a support member erected from the ground.
0 can be easily fixed. And the film body 1
6 can be easily fixed on the film body 16 without being attached to the film body 6, so that after the ceiling wall 8 is cured, the film body 16 can be easily removed without damage. When the storage 2 is constructed, the membrane 16 can be diverted when the ceiling wall 8 of another storage 2 is constructed, which is advantageous in reducing costs.

If the opening frame 20 is formed using a heavy material such as iron, the film body 16 may be displaced downward. It is preferable to form a mold 20 for
Further, it is more preferable to form the opening mold 20 with a lightweight material such as styrene foam. Further, in the present embodiment, the case where the opening form 20 is placed on the membrane 16 before the first concrete layer 22 is formed has been described, but the first concrete layer 22 is formed. At this time, if the concrete is sprayed except where the opening form 20 is fixed, the opening form 20 is placed on the film body 16 after the first concrete layer 22 is formed, 24, it may be fixed on the film body 16 using the binding wire 28. The present invention, the type of concrete structure, the location of the opening formed in the concrete wall,
Widely applied regardless of the shape of the opening.

[0014]

As is clear from the above description, the present invention
Since the opening formwork is fixed on the membrane using a reinforcing bar provided on the concrete wall without being attached to the membrane, the opening may be formed in a concrete wall portion away from the ground. In addition, the opening formwork can be easily fixed, and the membrane can be easily removed without damaging it.When constructing multiple concrete structures, the membrane can be connected to other concrete structures. It can be diverted during construction, which is advantageous in reducing costs.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a storage tank.

FIGS. 2A and 2B are cross-sectional views of a central portion of a ceiling wall.

FIG. 3 is a plan view of a central portion of a ceiling wall.

[Explanation of symbols]

 Reference Signs List 2 Storage tank 6 Side wall 8 Ceiling wall 12 Lightning rod device 14 Opening 16 Membrane 18 Closed space 20 Formwork for opening 22 First concrete layer 28 Binding wire 30 Second concrete layer

──────────────────────────────────────────────────の Continuing on the front page (51) Int.Cl. ⁶ Identification code FI E04H 7/18 302 E04H 7/18 302 (72) Inventor Yoshinori Shigeoka 8-21-2 Nishishinjuku, Shinjuku-ku, Tokyo Dome Japan Co., Ltd.

Claims (4)

[Claims] 1. An open space is formed inside a membrane body by expanding a membrane body, and a predetermined pressure is applied to the inside of the closed space to expand the membrane body into a predetermined shape, and an opening is formed outside the inflated membrane body. When laying a formwork and spraying concrete on the outside of the membrane, and after hardening the concrete, removing the opening formwork and constructing a concrete wall having an opening, the opening is formed outside the inflated membrane. Concrete is sprayed except for the part to be formed to form a first concrete layer having a predetermined thickness on the outside of the film body. Next, reinforcing bars are arranged on the first concrete layer, and Using the reinforcing bar, the opening form is fixed to a predetermined position outside the membrane, and then concrete is sprayed on the first concrete layer and around the opening form, This concrete layer and this A concrete wall is formed by the reinforcing steel arranged on the first concrete layer and the concrete sprayed on these, and after the blown concrete hardens, the formwork for opening is removed from the concrete wall and the opening is opened. A method of forming an opening using an opening mold, wherein the opening is formed in a portion where the opening mold was attached. 2. The film body is blackened in advance with a location where an opening formwork is to be attached, and before the concrete for forming the first concrete layer is sprayed on the film body, 2. The method for forming an opening using the opening formwork according to claim 1, wherein the opening formwork is placed on the blackened portion. 3. The formation of an opening using the opening formwork according to claim 1, wherein the opening formwork is fixed to the outside of the film body by a binding wire laid between the reinforcing bar and the opening formwork. Method. 4. The method for forming an opening using the opening formwork according to claim 1, wherein when the opening formwork is removed from the concrete wall after the concrete is hardened, the film body is also removed from the concrete wall.