JP2001003374A - Execution method of underground concrete wall using embedded form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the execution method of an underground concrete wall using embedded forms, by which an earth retaining for preventing collapse need not be installed to a sheer ground in the periphery of an underground space formed by excavation construction works when the concrete wall is built under the ground and a work platform for placing concrete into temporary forms can be made unnecessary. SOLUTION: In the execution method, the forms are mounted into a space 1 formed under a ground by excavation construction works and the concrete wall is built. Embedded forms 3 are set up as outer circumferential forms 2 in the forms at that time, temporary forms 5 are fitted as inner circumferential forms 4, soil and sand 7 are back-filled among the embedded forms 3 and a sheer ground 6 on the outside of the forms 3, concrete is placed among the embedded forms 3 and the temporary forms 5, and the concrete cures and only the temporary forms 5 are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground concrete wall constituting a basement, an underground parking lot, and the like, and more particularly to a method for simplifying root cutting work and placing concrete in a formwork. The present invention relates to a method for constructing an underground concrete wall which can eliminate the need for a work scaffold.

[0002]

2. Description of the Related Art When constructing a concrete wall underground, for example, when constructing a basement or an underground parking lot, the following construction method has conventionally been used. That is, as shown in FIG. 10, first, the ground is excavated to perform root cutting work. At this time, a space 51 that is sufficiently larger than a space necessary for construction of a basement or an underground parking lot is formed.
An earth retaining member 53 is provided to prevent the steep ground 52 around the space 51 from collapsing. The retaining 53 is usually H
This is performed by driving a steel column into the soil and bridging a retaining plate between the H-beams. And the space 51
Floor slab 5 that serves as the floor of a basement or underground parking lot inside the building
After the construction of 4, the temporary formwork 55 for constructing the concrete wall is installed thereon.

As shown in FIG. 11, a temporary formwork 55 used here has a face plate 56 forming a flat surface on which concrete is cast, and an outer peripheral surface formed on the outer periphery of the outer surface of the faceplate 56. Rib 57 and the outer peripheral rib 57 for reinforcement.
A steel frame having a middle rib 58 formed so as to connect between them and a connecting hole 59 formed in the outer peripheral rib 57 for connecting adjacent molds is often used.

[0006] As shown in FIG. 10, a pair of the temporary forming frames 55 are arranged such that the inner surfaces of the face plate 56 on the concrete placing side face each other, and the outer peripheral ribs 57 are provided.
And a connecting tool such as a bolt or a hook (not shown) is inserted into the connecting hole 59 formed in the above-mentioned section to connect the adjacent temporary formwork 55 to be installed. Next, a temporary work scaffold 60 is provided along the temporary formwork 55. Then, an operator 61 places concrete in the temporary formwork 55 from above the work scaffold 60, cures the concrete for several days and hardens the concrete, and then removes the temporary formwork 55. After the construction of the concrete wall is completed in this way, the earth retaining member 53 is dismantled and earth and sand are buried in the space 51 between the concrete wall and the surrounding steep ground 52.

However, in such a conventional method of constructing a concrete wall, it is necessary to maintain the steep ground 52 for a long time after the root cutting work until the concrete wall is completed. In order to prevent the ground from loosening and collapsing due to heavy rain, a typhoon, or the like, it was necessary to provide an earth retaining structure 53. And the earth retaining 53
Is to be removed after the concrete wall is completed, and the work of installing and removing the retaining wall 53 has contributed to an increase in construction cost and an extension of the construction period. On the other hand, if the ground collapses without providing the earth retaining 53, the collapsed earth and sand is scattered on the ground, or the installed working scaffold 60 and the temporary formwork 55 may fall, and the damage is large. Restoring the collapsed ground is a very time-consuming operation, and there is a problem that the construction period is greatly delayed.

Further, in order to cast concrete into the temporary formwork 55 after being connected and installed, concrete must be poured through an opening above the temporary formwork 55. The temporary work scaffold 60 is moved so that the worker 61 reaches the opening above the temporary formwork 55.
Need to be provided along the temporary formwork 55.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problem. When a concrete wall is constructed underground, a steep ground around an underground space formed by root cutting work is provided. An underground concrete wall using a buried formwork that does not need to be provided with earth retaining for preventing collapse, and can eliminate the need for a working scaffold for placing concrete in the temporary formwork. It is an object of the present invention to provide a construction method.

[0008]

Means for solving the above problems are as follows. That is, the method of constructing an underground concrete wall using a buried formwork according to claim 1 is a method of constructing a concrete wall by installing a formwork inside a space formed underground by root cutting work. In the construction method, of the formwork, a buried formwork is installed as an outer formwork, and a temporary formwork is installed as an inner formwork, and then, between the buried formwork and the steep ground outside the formwork. After the soil is backfilled, concrete is poured between the buried form and the temporary form, and only the temporary form is removed after the concrete has hardened.

According to a second aspect of the present invention, there is provided a method for constructing an underground concrete wall using a buried form, wherein adjacent forms are connected to each other as the buried form. In addition, a connecting portion for performing the above operation is provided on the peripheral portion of the inner surface of the face plate on the concrete casting side, and a buried form provided with a heat insulating material on the inner surface of the face plate is used.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a buried form 3 according to the present invention will be described.
A method of constructing an underground concrete wall using the method will be described with reference to the drawings. The method of constructing an underground concrete wall using the buried formwork 3 according to the embodiment of the present invention is a method of installing a formwork inside a space 1 formed underground by root cutting work to construct a concrete wall. In the construction method described above, of the above molds, a buried form 3 is provided as the outer form 2 and a temporary form 5 is provided as the inner form 4 and, as shown in FIG. After burying earth and sand 7 between the formwork 3 and the steep ground 6 outside the formwork, concrete is poured between the buried formwork 3 and the temporary formwork 5 and after the concrete hardens. This is a construction method characterized in that only the temporary formwork 5 is removed. Less than,
This will be described in more detail.

First, as shown in FIG. 2, the ground is excavated to perform a root cutting work to form a space 1 necessary for constructing a basement or an underground parking lot. In the present embodiment, unlike the conventional method of constructing an underground concrete wall, no earth retaining is provided on the steep ground 6 around the space 1 formed underground. After the construction of the floor slab 8 serving as a floor portion of a basement or an underground parking lot is performed inside the space 1, a formwork for constructing a concrete wall is installed thereon.

Here, as the formwork for constructing the concrete wall, two types of formwork, a buried formwork 3 and a temporary formwork 5, are used. Then, as shown in FIG. 3, a buried form 3 is set as the outer form 2, and a temporary form 5 is set as the inner form 4. The outer peripheral formwork 2 is a formwork for forming the outer surface of the concrete wall, and is a formwork arranged on the side facing the steep ground 6. Further, the inner peripheral form 4 is a form for forming an inner surface of a concrete wall, that is, a surface on the indoor side, and is a mold which is arranged inside the outer peripheral form 2 in parallel at regular intervals. It is a frame. In the present embodiment, as the temporary formwork 5 used as the inner peripheral formwork 4, the same one as the steel formwork described in the section of "Prior Art" is used. Therefore, each part of the temporary formwork 5 is assigned the same number as that described in the section of "Prior Art", and the description is omitted.

Although FIG. 3 shows the arrangement of the formwork in the case where the surroundings of the basement and the like are all made of concrete walls for ease of explanation, the formwork can be constructed by the method according to the present invention. The form of the underground concrete wall is not limited to this. For example, a structure frequently used in a parking lot of a detached house,
Although the left and right sides and the back side of the parking lot are underground, when the entrance and exit portion 9 is configured to face an open road or the like, as shown in FIG. The buried formwork 3 and the temporary formwork 5 are installed so as to be constructed in the following manner. Also in this case, the portion that forms the outer surface of the concrete wall facing the steep ground 6 formed by the above-mentioned root cutting work becomes the outer peripheral form 2, and the burying form 3 is used. Further, a portion forming the inner surface of the concrete wall inside the parking lot becomes an inner peripheral form 4 and the temporary form 5 is used. In addition, even if it is the part which forms the outer surface of a concrete wall, near the entrance of a parking lot, the normal temporary formwork 5 is used instead of using the buried formwork 3. This is on the left and right sides of the entrance 9 of the parking lot,
This is because other structures such as a block wall are provided, and the buried form 3 may become an obstacle.

In the present embodiment, as shown in FIG. 5, the embedding form 3 used as the outer peripheral form 2 is a connecting portion 1 for connecting adjacent forms to each other.
0 is provided on the periphery of the inner surface of the face plate 11 on the concrete placement side, and a heat insulating material 12 is provided on the inner surface of the face plate 11.
A buried insulating formwork 16 provided with Hereinafter, the buried insulation form 16 will be described in more detail.

The buried heat insulating form 16 has a face plate 11 formed in a rectangular flat plate shape constituting a main body portion.
An outer peripheral rib 13 is formed on the inner peripheral surface of the face plate 11. The outer peripheral rib 13 reinforces the face plate 11,
It is formed in order to prevent the deformation of the buried insulation form 16 and to form the close contact surface 14 when connecting the adjacent buried insulation form 16. Therefore, the outer peripheral rib 13 has a shape having a plane perpendicular to the face plate 11 so as to form the close contact surface 14.

A connecting hole 15 is formed at a predetermined position of the contact surface 14 of the outer peripheral rib 13 as a connecting portion 10 for connecting adjacent buried heat-insulating forms 16 to each other. The connecting hole 15 is a circular hole for inserting a connecting tool such as a bolt or a hook. The connecting hole 15 is formed at any position. It is necessary that the positions of the formed connection holes 15 match. Therefore, the connection hole 15 is formed at the same position for all the buried and heat-insulated formwork 16 and is symmetrical in the vertical and horizontal directions so that it is the same position even when used upside down. It is formed as follows. The form of the connecting part 10 is not limited to this, and all forms of the connecting part 10 known in the technical field of other connecting structures can be applied.

The heat insulating material 1 is provided on the inner surface of the face plate 11.
2 are provided. The heat insulating material 12 is a water-resistant porous heat insulating material 12 such as styrene foam, polyethylene foam, or the like.
It is preferable to use a plate having a thickness equal to or less than the height from the inner surface of the sheet. Insulation material 1
The size 2 is formed so as to have a width and a height such that a fixed gap d is formed between the heat insulating material 12 and the outer peripheral rib 13 when attached to the inner surface of the face plate 11. . This is because when the heat insulating material 12 is in close contact with the outer circumferential rib 13, a connecting tool such as a bolt or a hook is inserted into the connecting hole 15 formed in the outer circumferential rib 13, and the adjacent buried insulating type is inserted. This is because the work of connecting the frames 16 cannot be performed. In addition, the attachment of the heat insulating material 12 to the face plate 11 is usually performed by using an adhesive, but is not limited thereto.
It may be attached by other methods.

Further, as shown in FIG. 6, the face plate 11 may be formed by bending the face plate 11 at a right angle for use at the corner of the concrete wall to be constructed. Since the buried insulation form 16 according to the present invention is used as the outer form 2 as described above, only the form for the corner of the concrete wall is required. Therefore, the inner surface of the face plate 11 is the inner angle side of the face plate 11 bent at a right angle, and the heat insulating material 12 is provided on the inner angle side of the face plate 11.

It is preferable to use the buried heat-insulating form 16 as the buried form 3, but the buried form 3 is not limited to this. Other existing forms, such as the steel forms described, can also be used.

When installing a formwork for constructing the concrete wall, first, the embedding formwork 3 constituting the outer formwork 2 is installed first. As shown in FIG. 7, which is a cross-sectional view in the horizontal direction, the embedding form 3 is oriented such that the inner surface of the face plate 11 on which the heat insulating material 12 is provided is on the concrete casting side. The contact surfaces 14 of the outer peripheral ribs 13 are arranged in close contact with each other. Then, bolts 17 are inserted into connection holes 15 formed in the outer peripheral ribs 13, and nuts 18 are fastened to connect the nuts 18 to each other. As described above, the connection hole 15 which is the connection portion 10 of the buried form 3 is formed in the outer peripheral rib 13 provided on the peripheral portion of the inner surface of the face plate 11, so that the buried form 3 is formed. The connecting operation of No. 3 can be performed from the inner surface, that is, from the concrete placing side. Therefore, it is not necessary to provide a space for the worker to enter between the buried form 3 and the steep ground 6, and the amount of earth and sand 7 to be excavated by the excavation work can be reduced accordingly. . It is also possible to use other connecting tools such as hooks instead of the bolts 17 and the nuts 18. However, the buried form 3 is buried underground while being attached to the outer surface of the concrete wall. Therefore, from the viewpoints of the reliability of the fastening and the cost, the connection by the bolt 17 and the nut 18 is preferable.

After the above-mentioned embedding form 3 constituting the outer form 2 is installed, a temporary form 5 constituting the inner form 4 is installed. At this time, as shown in FIG. 8 which is a horizontal sectional view, the inner side surface of the face plate 56 where the outer peripheral rib 57 is not formed is on the concrete placing side, that is, the buried form 3
The outer peripheral ribs 57 are arranged so as to be in close contact with each other. Then, the hook 19 is inserted into the connection hole 59 formed in the outer peripheral rib 57 and connected to each other. The temporary formwork 5 is configured such that the connection hole 59 is
Is formed on the outer peripheral rib 13 provided on the peripheral edge of the outer surface of the temporary form 5. Therefore, the embedded form 3 that forms the outer form 2 and the temporary form 5 that forms the inner form 4 are:
In any case, the connecting operation can be performed from the side opposite to the steep ground 6. It is to be noted that the temporary formwork 5 is connected by the hook 19, unlike the buried formwork 3, in which the temporary formwork 5 needs to be removed after the concrete wall is hardened. This is because it is preferable to use a hook 19 for easy connection.

As described above, after the above-mentioned embedding form 3 which becomes the outer form 2 and the above-mentioned temporary form 5 which becomes the inner form 4 are installed, as shown in FIG. Earth and sand 7 are backfilled in the space between the frame 3 and the steep ground 6 outside the frame 3. At this time, in order to prevent the buried formwork 3 and the temporary formwork 5 from falling down to the opposite side due to the pressure of the backfilled earth and sand 7, a support 20 is previously attached to the buried formwork 3 and the temporary formwork 5. Is provided. In the present embodiment, a beam 21 is provided between the temporary formwork 5 on both sides, and the beam 21 is supported from below by a telescopic pipe support 22 to support the temporary formwork 5. I have. In addition,
The buried form 3 is supported by a separator 23 so as to be parallel to the temporary form 5.

As described above, before the concrete is poured into the formwork, the buried formwork 3 and the steep ground 6
By burying the earth and sand 7 in the space between
The period for maintaining the steep ground 6, which has been required for a long time from the excavation work to the completion of the concrete wall, can be greatly reduced from the excavation work to the installation of the formwork. Therefore, construction can be performed while avoiding heavy rains and typhoons, so that it is not necessary to provide earth retaining on the steep ground 6, thereby shortening the construction period and reducing the construction cost. This also makes it possible to cast concrete between the buried formwork 3 and the temporary formwork 5 from the backfilled earth and sand 7, which was conventionally required. The work scaffold provided along the periphery of the formwork can be eliminated.

Next, an operator 24 places concrete between the buried form 3 and the temporary form 5 from above the backfilled earth and sand 7 and cures the concrete for several days. To cure. Thereafter, as shown in FIG. 9, the temporary formwork 5 and the support for supporting the temporary formwork 5 are removed, and the concrete wall 25 is completed. Then, the buried formwork 3 constituting the buried formwork 3 is buried and left as it is on the outer periphery of the concrete wall, that is, between the concrete wall and the surrounding soil 7. After the concrete wall is constructed in this way, the ceiling and other works are continuously performed thereon.

In this embodiment, a buried heat-insulating form 16 having a heat insulating material 12 on the inner surface of its face plate 11 is used as the buried form 3 as described above. By embedding and leaving the buried form 3 around the outer periphery of the concrete wall 25, the heat insulating material 12 can be easily provided on the outer surface of the concrete. Thereby, heat insulation between the soil 7 outside the concrete wall 25 and the air inside the concrete wall 25 can be performed, and the formation of dew on the inner surface of the concrete wall 25 can be prevented. Therefore, to prevent condensation, separate concrete wall 2
There is no need to do the work of providing the heat insulating material 12 on the inner surface of 5,
The construction cost can be reduced and the construction period can be shortened.

[0026]

As described above, according to the method for constructing an underground concrete wall using a buried form according to the present invention, the following effects can be obtained. In other words, according to the method for constructing an underground concrete wall using a buried formwork according to claim 1, the embedding is performed before casting concrete between the buried formwork and the temporary formwork. By backfilling the space between the killing formwork and the steep ground,
Conventionally, the period for maintaining the steep ground, which has been required for a long time from the excavation work to the completion of the concrete wall, can be greatly reduced from the excavation work to the installation of the formwork. Therefore, construction can be performed while avoiding heavy rains and typhoons, so that it is not necessary to provide earth retaining structures on the steep ground, thereby shortening the construction period and reducing construction costs.

[0027] Further, by this, the operation of casting concrete between the buried form and the temporary form can be performed on the earth and sand buried in the space between the buried form and the steep ground. Therefore, the work scaffolding which had to be provided along the periphery of the formwork in the past can be eliminated.

According to the method for constructing an underground concrete wall using a buried form according to a second aspect of the present invention, in addition to the above-mentioned effects, as the buried form, a heat insulating material is provided on the inner surface of a face plate. By using the provided buried insulation formwork, it is possible to easily provide a heat insulating material on the outer surface of the concrete by using it as an outer formwork of a concrete wall to be constructed underground and then leaving it buried and leaving it as it is. . This makes it possible to insulate the earth and sand on the outside of the concrete wall from the air on the inside and to prevent dew condensation on the inner surface of the concrete wall. Therefore, it is not necessary to separately provide a heat insulating material on the inner surface of the concrete wall in order to prevent dew condensation, and it is possible to reduce the construction cost and the construction period.

Further, in the above-mentioned buried thermal insulation formwork, since a connecting portion for connecting the adjacent formwork with each other is provided on the peripheral portion of the inner surface on the side where the concrete is placed on the face plate, the adjacent formwork is provided. The joining operation of the killing formwork can be performed from its inner surface, that is, from the concrete placing side. Therefore, it is not necessary to provide a space for an operator to enter between the buried formwork and the steep ground, and the amount of excavated soil by the excavation work can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention,
It is a figure which shows the state in which earth and sand are back-filled between the outer peripheral formwork and the steep ground, and the worker is pouring concrete on it.

FIG. 2 is an explanatory diagram of an embodiment of the present invention,
It is a figure which shows the state which installed the formwork after root cutting.

FIG. 3 is an explanatory diagram of an embodiment of the present invention,
It is a figure which shows arrangement | positioning of a buried formwork and a temporary formwork when all the surroundings are concrete walls.

FIG. 4 is an explanatory diagram of an embodiment of the present invention,
It is a figure which shows arrangement | positioning of a buried form and a temporary form when a concrete wall is constructed in a U-shape.

FIG. 5 is a view showing a buried insulation form used in the embodiment of the present invention.

FIG. 6 is a view showing an example of a buried heat insulation formwork used in the embodiment of the present invention, which is used for a protruding corner portion.

FIG. 7 is an explanatory diagram of an embodiment of the present invention,
It is a horizontal sectional view showing the state where buried formwork was arranged and connected.

FIG. 8 is an explanatory diagram of an embodiment of the present invention,
It is a horizontal sectional view showing the state where the temporary formwork was arranged and connected.

FIG. 9 is a diagram illustrating an embodiment of the present invention,
It is a figure showing the state where the underground concrete wall was completed.

FIG. 10 is an explanatory view of a method of constructing an underground concrete wall according to a conventional example.

FIG. 11 is a view showing a temporary formwork according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground space formed by excavation work 2 Perimeter formwork 3 Burial form 4 Inner form 5 Temporary form 6 Stumped ground 7 Backfilled earth and sand 10 Connection part of buried and heat-insulated form 11 Buried Face plate of heat insulation formwork 12 Insulation material of buried heat insulation formwork 16 buried heat insulation formwork 20 Shoring 25 Concrete wall

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) E04B 2/86 601Q 611D 611J 611K 611L F-term (Reference) 2D047 AA01 AA05 2E001 DD01 EA01 FA29 GA45 HA04 HD08 HD09 HF11 LA11 LA13 2E177 EA

Claims (2)

[Claims] An underground concrete wall construction method for constructing a concrete wall by installing a formwork inside a space formed underground by an excavation work, wherein the formwork is buried as an outer peripheral formwork in the formwork. After installing the temporary formwork as the inner peripheral formwork, backfill the earth and sand between the buried formwork and the steep ground outside thereof, and then the buried formwork and the temporary formwork A method for constructing an underground concrete wall using a buried formwork, wherein concrete is poured in between the concrete forms and only the temporary formwork is removed after the concrete has hardened. 2. A connecting portion for connecting adjacent formwork to each other is provided on a peripheral portion of an inner surface of the face plate on a concrete casting side of the face plate, and heat insulation is provided on an inner surface of the face plate. The method for constructing an underground concrete wall using a buried form according to claim 1, wherein a buried form provided with a material is used.