JPH11315611A - Ceiling wall forming method using membrane body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling wall forming method using a membrane body allowing a ceiling wall to be formed in desired shape even in the case of a huge ceiling wall. SOLUTION: An outer peripheral edge of a membrane body 20 is airtightly fitted to a concrete bottom plate 1. Compressed air is supplied into airtight space inside the membrane body 20 to expand the membrane body 20, and the pressure of the airtight space is kept to the first value. Concrete is sprayed onto the membrane body 20 up to the height of about 4/10 of the height of the membrane body 20 to form a first layer of a first concrete wall 1402. While the concrete forming the first concrete wall 1402 has fluidity, the pressure of the airtight space is raised to the second value higher than the first value to lift the first layer of the sunk first concrete wall 1402 up to the initial position to adjust the shape of the first concrete wall 1402. The first layer concrete wall is thus formed upward every area while heightening the pressure of the airtight space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a ceiling wall using a film.

[0002]

2. Description of the Related Art When forming with a ceiling wall,
A concrete bottom slab is provided with a contour corresponding to the lower contour of the ceiling wall to be formed, and an outer peripheral edge of a membrane having a shape corresponding to the inner surface of the ceiling wall to be formed is air-tightly mounted on the concrete bottom slab. The method of supplying compressed air to the inside of the airtight space to inflate the membrane and blowing the concrete on the outside of the membrane while maintaining the pressure of the airtight space at a value higher than the atmospheric pressure to form the ceiling wall is It is being put to practical use because it does not require assembling and removing the formwork, shortening the construction period and reducing costs.

[0003]

When the ceiling wall to be formed is huge, for example, when a dome-shaped ceiling wall having a diameter of about 50 m is formed, the pressure inside the membrane is set to a high value. Even if it is kept, the weight of the concrete sprayed to the outside of the membrane increases, so that the desired shape cannot be maintained by the membrane and a ceiling wall having a desired shape cannot be formed. The present invention has been devised in view of the above circumstances, and an object of the present invention is to use a film body that can form a ceiling wall in a desired shape even when the ceiling wall is huge. An object of the present invention is to provide a method for forming a ceiling wall.

[0004]

According to the present invention, a concrete bottom slab is provided on a ground in a shape including a contour of a lower end of a dome-shaped ceiling wall to be formed. A film body having a shape corresponding to the inner surface of the film body is provided, the outer peripheral edge of the film body is airtightly mounted on the concrete bottom slab, and compressed air is supplied to an airtight space inside the film body to expand the film body. When spraying concrete on the outside of the film body to form a ceiling wall while maintaining the pressure of the airtight space at a value higher than the atmospheric pressure, at least three or more surfaces of the inflated film body at different heights are formed at different heights. The first layer concrete wall is formed for each area from the lower area to the upper area, and when forming the first layer concrete wall, it is positioned at the lowest position. Concree in the area When the pressure of the airtight space at the time of spraying is set to the first value, after spraying the concrete on the lowest region, the concrete sprayed on the membrane has fluidity while the concrete sprayed on the membrane has fluidity. After increasing the pressure to a second value higher than the first value and returning the film body displaced downward by the spraying of the concrete to the original position and hardening the concrete, the pressure of the airtight space is increased to the second value. The concrete above the area is sprayed while maintaining the pressure, and the pressure in the airtight space is raised to a third value higher than the second value while the concrete sprayed on the membrane has fluidity. The film body displaced downward by spraying is returned to the original position and the concrete is hardened, and thus, from the lower area to the upper area, each time the concrete is sprayed on each area The first-layer concrete wall is formed while sequentially increasing the pressure in the airtight space, and the entire outer surface of the membrane is covered with the first-layer concrete wall. Concrete is sprayed on the outside to form one or more layers of concrete walls. Also,
In the present invention, before spraying the concrete constituting the first-layer concrete wall, an annular shape is formed around the center of the dome-shaped inflated membrane at a location near the top of the membrane and a location below the same. The first main ring and the second main ring are respectively mounted so as to be present, and a plurality of cables are connected between the second main ring and a plurality of locations spaced apart in the circumferential direction of the first main ring. In addition, a plurality of cables are connected between a plurality of circumferentially spaced portions of the second main ring and the bottom plate by a plurality of cables. Further, according to the present invention, before the concrete is sprayed for each of the regions, the reinforcing bar is arranged at the film body portion corresponding to the region where the concrete is sprayed, and the concrete sprayed to the region where the reinforcing bar is arranged is hardened. Later, before the concrete is sprayed on the area above it, the reinforcing bar is laid on the membrane part corresponding to that area, and after the reinforcing bar is laid on the area where the concrete is sprayed, concrete is sprayed. It is characterized by the following.
Further, the invention is characterized in that the film body is expanded in a dome shape.

According to the present invention, the area on which the concrete is sprayed on the inflated film body is divided into three or more regions for each height, and the pressure of the airtight space is sequentially increased for each region to correct the deformation of the film body. The first layer concrete wall is formed. Next, after forming the shaped first-layer concrete wall, a ceiling wall is formed by forming one or more layers of concrete walls outside the first-layer concrete wall.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1A is a plan view of a completed concrete structure, FIG. 1B is a sectional front view of the same, and FIGS. 2A to 3D are explanatory views of the method of the present invention. In this embodiment, the concrete structure is a waste disposal site 1
2, the waste disposal site 12 has a dome-shaped (upwardly convex curved surface) ceiling wall 14. The ceiling wall 14 is erected from a concrete bottom slab 16 having an annular shape, a disk shape, or a rectangular shape, and a waterproof layer 18 is provided on a ground shape inside the concrete bottom slab 16.

[0007] Such a waste disposal site 12 is constructed as follows. First, as shown in FIG. 2 (A), after leveling, a concrete bottom slab 16 is provided with a contour including the lower part of the refuse disposal site 12 for construction. Next, FIG.
As shown in the figure, the ceiling wall 14 of the landfill
A film body 20 having a shape corresponding to the inner surface of
0 is airtightly mounted on the concrete bottom slab 16. Next, as shown in FIG. 2C, compressed air is supplied to the airtight space 2010 inside the film body 20 to expand the film body 20, and the pressure in the airtight space 2010 is higher than the atmospheric pressure.
Keep the value of.

Next, as shown in FIG.
The first main ring 30 and the second main ring 32 are attached to the upper part and the lower part, respectively, so as to extend annularly around the center of the film body 20 expanded in a dome shape. Main ring 30 and second main ring 32
Are connected by cables 34, and the plurality of circumferentially spaced points of the second main ring 32 and the bottom plate 16 are connected by cables 34. The first main ring 30 is installed at, for example, a location 8/10 to 9/10 of the height of the film body 20, and the second main ring 32 is installed at a position of 6/10 to 7/7 of the height of the film body 20. / 10. In addition,
The work of arranging the main rings 30 and 32 and the cable 34 is performed, for example, by placing an operator on an aerial work vehicle.

Next, a reinforcing bar or the like is attached to the outer surface of the film body 20 up to a height of about 4/10 of the height of the film body 20, specifically to the same height as a first concrete wall 1402 of a first layer described later. Reinforcement is provided, or a wire mesh is attached to the outer surface of the membrane body 20 in addition to the reinforcing bar. In addition, such a bar arrangement work is performed, for example, by a worker getting on a work platform.

Next, as shown in FIG.
The concrete C is sprayed onto the membrane body 20 from above the assembled rebar to a height of about 4/10 of the height of the first concrete wall 14 having a thickness of, for example, about 40 mm.
02 is formed. In addition, such a spraying operation of the concrete C is performed, for example, by placing an operator on an aerial work vehicle. Here, when the concrete C is sprayed, even if the pressure of the hermetic space 2010 is maintained at the first value, the surface area of the membrane portion to which the concrete C is sprayed is large and the weight of the concrete C to be sprayed is large. The film portion to which C was sprayed sinks though slightly. Therefore, before the concrete forming the first concrete wall 1402 of the first layer is hardened, in detail, while the concrete forming the first concrete wall 1402 of the first layer has fluidity, the airtight space 2010 is formed.
Is increased to a second value higher than the first value.
This second value raises the sunken first layer first concrete wall 1402 to its initial position,
This is a value sufficient to shape the shape of the concrete wall 1402. For example, the difference between the first value and the second value is 10 to 30 mm.
about aq. The pressure of the airtight space 2010 is increased by the first
May be during spraying of the concrete, or the spraying of the concrete is completed and the first concrete wall 14 of the first layer is increased.
02 may be formed after the concrete is formed, that is, while the concrete has fluidity.

When the concrete C forming the first concrete wall 1402 has hardened, it is 7/10 of the height of the film body 20.
In the same manner as described above, reinforcing bars such as reinforcing bars are provided on the outer surface of the membrane body 20 up to the front and rear heights, in detail, to the same height as the second concrete wall 1404 of the first layer described later, or in addition to the reinforcing bars. A wire mesh or the like is attached to the outer surface of the film body 20. Next, as shown in FIG. 3B, the height of the film body 20 is 7/1.
Concrete C is sprayed onto the membrane body 20 from above the assembled rebar to a height of about 0 to form a first-layer second concrete wall 1404 having a thickness of, for example, about 40 mm. In this embodiment, the second main ring 32
Form the second concrete wall 1404 up to the height at which is embedded. Here, when the concrete C is sprayed, even if the pressure of the hermetic space 2010 is maintained at the second value, the surface area of the membrane portion to which the concrete C is sprayed is large, and the weight of the concrete C to be sprayed is large. The film portion to which C was sprayed sinks though slightly. Therefore, as described above, before the concrete forming the first concrete wall 2404 of the first layer hardens, specifically, while the concrete forming the second concrete wall 1404 of the first layer has fluidity. , The pressure of the airtight space 2010 is set to a third pressure higher than the second value.
To the value of. This third value raises the second concrete wall 1404 of the sunken first layer to its initial position,
A value sufficient to shape the shape, for example, the second value and the third value
Is about 10 to 30 mmaq. Airtight space 2
The time when the pressure of 010 is increased to the third value higher than the second value may be during the spraying of the concrete, or the second concrete wall 1404 of the first layer after the spraying of the concrete is completed. May be formed after the concrete is formed, that is, while the concrete has fluidity.

When the concrete C forming the second concrete wall 1404 has hardened, it is 9/10 of the height of the film body 20.
In the same manner as described above, reinforcing bars such as reinforcing bars are provided on the outer surface of the membrane body 20 up to the front and rear heights, in particular, to the same height as the third concrete wall 1406 of the first layer described later, or in addition to the reinforcing bars. A wire mesh or the like is attached to the outer surface of the film body 20. Next, as shown in FIG. 3C, 9/1 of the height of the film body 20 is used.
Concrete C is sprayed onto the membrane body 20 from above the assembled rebar to a height of about 0 to form a first concrete third wall 1406 having a thickness of about 40 mm, for example. In this embodiment, the first main ring 30
The third concrete wall 1406 is formed up to the height at which is embedded. Here, when the concrete C is sprayed, even if the pressure of the hermetic space 2010 is maintained at the third value, the surface area of the membrane portion to which the concrete C is sprayed is large, and the weight of the concrete C to be sprayed is large. The film portion to which C was sprayed sinks though slightly. Therefore, as described above, before the concrete forming the third concrete wall 1406 of the first layer hardens, specifically, while the concrete forming the third concrete wall 1406 of the first layer has fluidity. , The pressure of the airtight space 2010 is set to a fourth pressure higher than the third value.
To the value of. This fourth value raises the third concrete wall 1406 of the sunken first layer to its initial position,
A value sufficient to shape the shape, for example, the third value and the fourth value
Is about 10 to 30 mmaq. Airtight space 2
The time when the pressure of 010 is increased to the fourth value higher than the third value may be during the spraying of the concrete, or the third concrete wall 1406 of the first layer after the spraying of the concrete is completed. May be formed after the concrete is formed, that is, while the concrete has fluidity.

Next, when the concrete C forming the third concrete wall 1402 is hardened, reinforcing bars such as reinforcing bars are applied to the entire area of the remaining film body 20 of the third concrete wall 1406, or a wire mesh is added in addition to the reinforcing bars. And the like are attached to the outer surface of the film body 20. Next, as shown in FIG. 3 (D), concrete C is sprayed onto the film body 20 from above the assembled reinforcing bar, thereby forming a first concrete fourth wall 1408 having a thickness of, for example, about 40 mm. Here concrete C
Is sprayed, even if the pressure of the hermetic space 2010 is maintained at the fourth value, the concrete C is sprayed because the surface area of the membrane portion to which the concrete C is sprayed is large and the weight of the sprayed concrete C is large. The part of the film body sinks slightly. Therefore, similarly to the above, before the concrete forming the first concrete wall 1408 of the first layer hardens, the concrete forming the fourth concrete wall 1408 of the first layer has fluidity. Then, the pressure in the hermetic space 2010 is increased to a fifth value higher than the fourth value. The fifth value is a value sufficient to raise the sunken first-layer fourth concrete wall 1408 to the initial position and adjust the shape, for example, the difference between the fourth value and the fifth value. Is about 10 to 30 mmaq. The time when the pressure of the airtight space 2010 is increased to the fifth value higher than the fourth value may be during the spraying of the concrete, or the fourth concrete of the first layer after the spraying of the concrete is completed. It may be after the wall 1408 is formed, that is, while the concrete has fluidity. As a result, the outer surface of the film body 20 becomes the first to fourth concrete walls 140 of the first layer.
2, 1404, 1406 and 1408 are covered by a first-layer concrete wall 1410.

When the concrete forming the first concrete wall 4408 of the first layer is hardened and the concrete wall 1410 of the first layer is formed, the concrete is then placed on the concrete wall 1410 of the first layer. To form a second level concrete wall 1420, or
After forming the second level concrete wall 1420, the second
A third-layer concrete wall 1430 is formed outside the first-layer concrete wall 1420, whereby the ceiling wall 14 is formed. The second layer concrete wall 1420 and the third
The concrete walls of the first and fourth layers may be, for example, sprayed with concrete from bottom to top similarly to the concrete walls of the first layer, or may be provided with a predetermined width to make the first and second concrete layers. You may make it form by spraying concrete radially from the center of a wall. Then, when the ceiling wall 14 is formed, a water-impervious sheet 18 or the like is applied to the ground portion inside the concrete bottom slab 16 to dispose the waste disposal site 1.
2 is obtained. After the ceiling wall 14 is formed, the film 2
It is optional to remove 0 or leave the film body 20 and use it as a part of the ceiling wall 14.

According to the present embodiment, when forming the ceiling wall 14, first, the first-layer concrete wall 1410 whose shape is adjusted is formed. That is, the area on which the concrete is sprayed on the inflated film body 20 is divided into four regions for each height, and concrete is sprayed for each region. The pressure in the airtight space 2010 was changed every time. That is, the film body 2 is provided for each region.
0th level concrete wall 141 while correcting deformation
0, a first-layer concrete wall 1410 having a predetermined shape is formed, and one or more layers of concrete walls are formed outside the first-layer concrete wall 1410 to form a ceiling wall 1.
4 was formed. Therefore, the diameter is, for example, 50
Even with a huge dome-shaped ceiling wall 14 of about m, it is possible to obtain a ceiling wall 14 having a desired shape without unevenness.

In this embodiment, the case where the ceiling wall has a dome shape has been described. However, the shape of the ceiling wall may be a semi-cylindrical shape which forms the wall surface of a tunnel, and the shape of the ceiling wall is not limited. Also, for example, in a circular shape in plan view,
Alternatively, a concrete wall is erected in a rectangular shape in a plan view, an outer peripheral edge of the membrane is attached to an upper end of the concrete wall, and an airtight space is formed inside the membrane in the same manner as in the above-described embodiment. The present invention is of course also applicable to a case where a concrete wall is formed by spraying concrete on the outside of the membrane and forming a ceiling wall covering the upper part of the concrete wall.In such a case, the concrete wall corresponds to a concrete bottom slab. Will do. In forming the first-layer concrete wall 1410, it is more preferable that the concrete to be sprayed is mortar. Therefore, in the present invention, "concrete" is a broad concept including mortar. In the present embodiment, the first concrete wall 1410 is divided into four concrete walls 1402, 140.
4, 1406, 1408, the description has been made. However, it may be divided into five or more regions and formed with five or more concrete walls, or may be divided into three regions and formed with three concrete walls. If it is formed by three concrete walls, the first concrete wall located at the lowest position is at a height of about 6/10 of the membrane, and the second concrete wall thereon is membrane-mounted. 8 of body
What is necessary is just to form in height of about 10.

[0017]

As described above, according to the present invention, a concrete bottom slab is provided on the ground in a shape including the contour of the lower end of the dome-shaped ceiling wall to be formed, and the concrete bottom slab corresponding to the inner surface of the ceiling wall is formed. A membrane having a shape is provided, the outer peripheral edge of the membrane is airtightly mounted on the concrete bottom slab, compressed air is supplied to an airtight space inside the membrane to expand the membrane, and the pressure of the airtight space is reduced. When forming a ceiling wall by spraying concrete on the outside of the membrane while maintaining a value higher than the atmospheric pressure, the outer surface of the inflated membrane is divided into at least three or more regions at different heights, A first-layer concrete wall is formed for each region from a lower region to an upper region, and when forming the first-layer concrete wall, concrete is sprayed on the lowest region. When When the pressure of the airtight space is set to the first value, the concrete in the lowermost area is sprayed, and then the pressure in the airtight space is increased while the concrete sprayed on the membrane has fluidity. After raising the film to a second value higher than the value of 1 and returning the film body displaced downward by the spraying of the concrete to the original position and hardening the concrete, the pressure of the airtight space is maintained at the second value. While the concrete is sprayed on the area above the concrete, the pressure of the airtight space is increased to a third value higher than the second value while the concrete sprayed on the membrane has fluidity, and the concrete is sprayed downward. The film body displaced to the original position is returned to the original position, and the concrete is hardened. Thus, the pressure of the airtight space is increased each time the concrete is sprayed from the lower region to the upper region to each region. Forming the first-layer concrete wall while gradually increasing, covering the entire outer surface of the membrane with the first-layer concrete wall, and then spraying concrete on the outside of the first-layer concrete wall, One or more concrete walls were formed. Therefore, the ceiling wall is formed in a continuous shape, and even in the case of a huge ceiling wall, the ceiling wall can be formed in a desired shape.

[Brief description of the drawings]

FIG. 1A is a plan view of a completed waste disposal site,
(B) is the same sectional front view.

FIGS. 2A to 2D are explanatory diagrams of a method of constructing a waste disposal site.

FIGS. 3A to 3D are explanatory diagrams of a method of constructing a waste disposal site.

[Description of Signs] 12 Garbage disposal site 14 Ceiling wall 1410 First-layer concrete wall 1420 Second-layer concrete wall 1402 First-concrete wall 1404 Second-concrete wall 1406 Third-concrete wall 1408 Fourth-concrete wall 16 Concrete Bottom plate 20 Film body 30 First main ring 32 Second main ring

Claims (4)

[Claims] 1. A concrete bottom slab having a shape including a contour of a lower end of a ceiling wall to be formed on a ground, a film having a shape corresponding to an inner surface of the ceiling wall to be formed is provided, The outer peripheral edge is airtightly mounted on the concrete bottom slab, compressed air is supplied to an airtight space inside the film body to expand the film body, and the pressure of the airtight space is maintained at a value higher than the atmospheric pressure. When concrete is sprayed on the outside to form a ceiling wall, the outer surface of the inflated membrane is divided into at least three or more regions at different heights, and each region is divided from a lower region to an upper region. Forming a first-layer concrete wall, and forming the first-layer concrete wall, the pressure of the airtight space at the time of spraying the concrete on the lowermost region is set to a first value. Place In this case, after spraying the concrete on the lowermost area, the pressure of the airtight space is increased to a second value higher than the first value while the concrete sprayed on the membrane has fluidity. After returning the film body displaced downward by the spraying of the concrete to the original position and hardening the concrete, while maintaining the pressure of the hermetic space at the second value, the concrete is sprayed on the area above the airtight space, Raising the pressure of the hermetic space to a third value higher than the second value while the concrete sprayed on has a fluidity, returning the film body displaced downward by the spraying of the concrete to the original position, The concrete of the first layer is hardened while the pressure of the airtight space is gradually increased every time the concrete is sprayed from the lower area to the upper area in each area. After covering the entire outer surface of the membrane with a first-layer concrete wall, concrete is sprayed on the outside of the first-layer concrete wall to form one or more layers of concrete walls. A method of forming a ceiling wall using a film body. 2. Prior to spraying the concrete forming the first-layer concrete wall, a ring is formed around the center of the dome-shaped inflated membrane at a location near the top of the membrane and below it. The first main ring and the second main ring are respectively mounted so as to extend, and a plurality of cables are connected between a plurality of circumferentially spaced portions of the first main ring and the second main ring by a plurality of cables. 2. The method for forming a ceiling wall using a membrane according to claim 1, wherein a plurality of cables are connected between a plurality of circumferentially spaced portions of the second main ring and the bottom plate. . 3. Before the concrete is sprayed on each area, a reinforcing bar is arranged at a film portion corresponding to the area where the concrete is sprayed, and after the concrete sprayed on the area where the reinforcing bar is arranged hardens. Before the concrete is sprayed on the area above it, reinforcing bars are arranged at the membrane part corresponding to the area, and after the reinforcing bars are arranged on the area where the concrete is sprayed, concrete is sprayed. A method for forming a ceiling wall using the film body according to claim 1 or 2. 4. The method for forming a ceiling wall using a film according to claim 1, wherein said film is expanded in a dome shape.