JP2022140972A - Concrete one-piece casting construction method for slab foundation - Google Patents

Abstract

To provide a concrete one-piece casting construction method for a slab foundation, which can construct the slab foundation easily and at a low cost, and which can provide a good concrete forming surface.SOLUTION: The method comprises an outer formwork preparation step of preparing an outer formwork 1 in which a steel plate 12 is mounted on the front surface of a weir 11 made of wood material, an inner formwork preparation step of preparing an inner formwork 2 made of wood material, a formwork holder preparation step of preparing a formwork holder 3 made of steel, an outer formwork installation step of installing the outer formwork 1 along the outer surface of the rising portion of the slab foundation to be constructed, a formwork holder mounting step of mounting the formwork holder 3 on the installed outer formwork 1, an inner formwork installation step of fixing the inner formwork 2 to the mounted formwork holder 3, a concrete casting step of casting concrete on the batholith portion and rising portion of the slab foundation, and a bubble removal step of removing air bubbles in the casted concrete along the steel plate 12 of the outer formwork 1.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a single-piece concrete casting method for simultaneously and integrally forming a base portion and a rising portion of a slab foundation.

2. Description of the Related Art Conventionally, in the foundation work of a building or the like, a single-piece concrete pouring construction method has been performed in which the base portion and the rising portion of a slab foundation are simultaneously and integrally formed. According to this construction method, the strength of the entire foundation can be improved without a seam between the bottom plate and the rising portion, unlike the case where concrete is placed separately for the bottom plate and the rising portion. , the intrusion of water into the foundation, etc., can be prevented.

Up to now, the one described in the following Patent Document 1 has been proposed as a form suspension fitting used when performing this single-piece concrete casting construction. According to this formwork suspension fitting, the inner formwork for forming the inner surface of the rising part of the slab foundation can be suspended and installed in a state of being raised by the thickness of the bottom plate part. There is no need to use a support pedestal for throwing away, and therefore, it is possible to repeatedly cast concrete in one piece at a low cost.

However, the single-piece concrete casting method using the form suspension fittings described in Patent Document 1 is a construction method that uses a heavy steel form, and requires considerable labor to install the form. In addition, since the formwork suspension fittings for suspending and holding the steel formwork are themselves heavy, the installation work of the formwork suspension fittings was not easy.

On the other hand, up to now, a method described in Patent Document 2 below has been proposed as a method for single-cast concrete construction using a relatively lightweight wooden formwork. However, although this construction method facilitates the work of installing a lightweight wooden formwork, it has drawbacks in terms of the durability of the wooden formwork and the poor smoothness of the surface on which concrete is to be formed.

JP-A-2001-81967 JP-A-51-15527

The present invention was devised in view of the above-mentioned drawbacks of the conventional single-cast concrete construction method for raft foundations. An object of the present invention is to provide a single-piece concrete casting construction method for a slab foundation that can obtain a surface.

The present invention relates to a single-piece concrete casting construction method for a slab foundation,
A rectangular dam plate made of wooden material, a steel plate attached to the front surface of the dam plate, an upper frame member and a lower frame member made of wooden material provided on the long sides of the rear surface of the dam plate, A pair of wooden vertical frame members provided on the short sides of the rear surface of the weir, and a wooden member provided parallel to the long side of the weir between the vertical frames on the rear surface of the weir. an outer formwork preparation step of preparing an outer formwork made of horizontal crosspieces made of timber;
A rectangular weir made of wooden material, upper and lower frame members made of wooden material provided on the long side of the rear surface of the weir, and short sides of the rear surface of the weir. Prepare an inner frame consisting of a pair of vertical frame members made of wooden material, and a horizontal crosspiece made of wooden material provided parallel to the long side of the weir plate between the vertical frame members on the rear surface of the weir plate. Inner formwork preparation process to
A mold for preparing a formwork holder consisting of an outer longitudinal member, a horizontal member extended laterally from the upper portion of the outer longitudinal member, and an inner longitudinal member suspended downward from the extended end of the lateral member. a frame holder preparation step;
An outer formwork installation step of installing the outer formwork along the outer surface of the rising portion of the slab foundation to be constructed;
a formwork holder attaching step of fixing the outer vertical member of the formwork holder to the outer formwork installed in the outer formwork installation step and attaching the formwork holder to the outer formwork;
By fixing the inner formwork to the inner vertical member of the formwork holder attached by the formwork holder attaching step, the inner mold is attached along the inner surface of the rising portion of the slab foundation to be constructed. An inner formwork installation process for installing a frame,
a concrete placing step of placing concrete in the base portion and the rising portion of the slab foundation to be constructed by pouring concrete into the installed outer formwork and inner formwork;
and a bubble removing step of removing air bubbles in the concrete placed by the concrete placing step along the steel plate of the outer formwork.

Further, the present invention is characterized in that the steel plate of the outer formwork is made of an aluminum-zinc alloy plated steel plate having a thickness of 0.3 to 0.8 mm.

Further, the present invention is characterized in that the upper edge portion of the steel plate of the outer formwork is bent toward the thickness surface of the weir and attached to the thickness surface.

Further, the present invention is characterized in that the left and right side edges of the steel plate of the outer formwork are folded back toward the dam and attached to the front surface of the dam.

Further, according to the present invention, outer screw holes are formed in the middle portion and the lower portion of the outer vertical member of the form holder, respectively, and upper and outer screw holes are formed in the portion of the horizontal member closer to the outer vertical member. , an upper inner screw hole is opened in a portion of the horizontal member closer to the inner vertical member, and an inner screw hole is opened in a middle portion and a lower portion of the inner vertical member, respectively,
In the step of attaching the formwork holder, the horizontal member is screwed to the upper surface of the upper frame member of the outer formwork with a screw passed through the upper outer screw hole of the horizontal member of the formwork holder, screwing the outer vertical members to the side surfaces of the horizontal crosspieces and the lower frame members of the outer form using screws passed through the outer screw holes of the outer vertical members;
In the inner mold frame installation step, the horizontal member is screwed to the upper surface of the upper frame member of the inner mold frame with a screw passed through the upper inner screw hole of the horizontal member of the mold holder. It is characterized in that the inner vertical members are screwed to the side surfaces of the horizontal crosspieces and the lower frame members of the inner formwork by screws passed through the inner screw holes of the inner vertical members.

The method of concrete casting for a slab foundation according to the present invention uses a lightweight outer formwork in which a steel plate is attached to a wooden dam and a lightweight inner formwork made of wood. It is possible to reduce the labor for the installation work of the outer formwork and the inner formwork, and moreover, it is possible to reduce the weight of the formwork holder itself that suspends and holds the lightweight inner formwork. can be reduced, making it possible to easily carry out concrete one-piece construction of slab foundations.

Furthermore, the method of concrete casting for slab foundations according to the present invention uses an outer formwork in which a steel plate is attached to a dam made of wood material, so that the outer formwork is excellent in durability and can be used for a long period of time. It can be used repeatedly over a long period of time, it is possible to perform single-piece concrete casting construction of a slab foundation at a low cost, and a good concrete forming surface can be obtained.

It is a rear view of the outer formwork used for the concrete single-piece construction method of the slab foundation of this embodiment. FIG. 2 is a partial cross-sectional view taken along the line AA in FIG. 1; FIG. 2 is a partial cross-sectional view taken along the line BB in FIG. 1; It is a rear view of the inner formwork used for the concrete one-piece construction method of the slab foundation of this embodiment. FIG. 2 is a perspective view of a formwork holder used in the single-cast concrete construction method for a slab foundation according to the present embodiment. It is a schematic side view which shows the form holder attachment process of the concrete one-piece construction method of the slab foundation of this embodiment. It is a schematic side view which shows the inner formwork installation process of the concrete one-piece construction method of the slab foundation of this embodiment. It is a schematic side view which shows the concrete casting process of the concrete one-piece construction method of the slab foundation of this embodiment. It is a schematic side view which shows the air-bleeding process of the concrete one-piece construction method of the slab foundation of this embodiment. FIG. 4 is a partially enlarged side view showing a mounting state of the formwork holder to the outer formwork during the process of installing the inner formwork in the single-cast concrete construction method for a slab foundation according to the present embodiment.

As shown in FIGS. 1 to 9, the method of the present embodiment for single concrete casting of a slab foundation is to prepare an outer formwork 1 in which a steel plate 12 is affixed to the front surface of a dam plate 11 made of a wooden material. A formwork preparation process, an inner formwork preparation process of preparing an inner formwork 2 made of wood material, a formwork holder preparation process of preparing a formwork holder 3 made of steel material, and a raft foundation to be constructed. An outer formwork installation step of installing the outer formwork 1 along the outer surface of the part, a formwork holder attachment step of attaching the formwork holder 3 to the installed outer formwork 1, and the attached formwork holder 3 The inner formwork 2 is fixed to the inner formwork 2, and the inner formwork 2 is installed along the inner surface of the rising part of the slab foundation to be constructed. and a bubble removing step for removing air bubbles in the placed concrete along the steel plate 12 of the outer formwork 1. - 特許庁

As shown in FIGS. 1 to 3, the outer formwork 1 prepared in the outer formwork preparation process includes a rectangular wooden dam plate 11, a steel plate 12 attached to the front surface of the dam plate 11, An upper frame member 13 and a lower frame member 14 made of wood material provided on the long sides of the rear surface of the weir 11, and a pair of vertical frame members made of wood material provided on the short sides of the rear surface of the weir 11. 15, 15, and a horizontal crosspiece 16 made of a wooden material provided parallel to the long side portion of the weir 11 between the vertical frame members 15 on the rear surface of the weir 11. - 特許庁

In this embodiment, a steel plate 12 made of an aluminum-zinc alloy-plated steel plate with a thickness of about 0.35 mm is attached to the front surface of a weir plate 11 made of wood plywood material with a thickness of about 12 mm with an adhesive and nails. The thickness of this steel plate 12 is preferably 0.3 to 0.8 mm. If the thickness of the steel plate 12 is less than 0.3 mm, the steel plate surface becomes uneven and wavy during the step of installing the outer form and the step of removing air bubbles, making it impossible to obtain a smooth concrete forming surface. If the thickness of the steel plate 12 is more than 0.8 mm, the weight of the outer frame 1 becomes too large.

Further, in this embodiment, as shown in FIG. 2, the upper edge portion 121 of the steel plate 12 is bent toward the thickness surface side of the weir plate 11 at the upper long side portion of the weir plate 11, and is attached to the thickness surface. It is Further, as shown in FIG. 3 , the left and right side edges 122 of the steel plate 12 are folded back toward the weir 11 and attached to the front surface of the weir 11 . As a result, the surface of the steel plate 12 is reliably prevented from being uneven or corrugated. The lower edge of the steel plate 12 may be bent toward the thickness surface of the weir 11 at the lower long side of the weir 11 and attached to the thickness surface. 2 and 3, the thickness of the steel plate 12 is exaggerated. The same applies to FIG. 10 described later.

As shown in FIG. 4, the inner formwork 2 prepared in the inner formwork preparation process includes a rectangular dam plate 21 made of wooden material and a wooden material material provided on the long side of the rear surface of the dam plate 21. Between the upper frame member 23 and the lower frame member 24, the pair of vertical frame members 25 and 25 made of wooden material provided on the short side portions of the rear surface of the weir plate 21, and the vertical frame member 25 on the rear surface of the weir plate 21 A horizontal crosspiece 26 made of a wooden material provided in parallel with the long side portion of the weir plate 21 .

As shown in FIG. 5, the formwork holder 3 prepared in the formwork holder preparation process was welded to the outer vertical member 31 made of angle steel and the upper end of the outer vertical member 31 and brought out in the horizontal direction. It is composed of a horizontal member 32 made of angle steel and an inner vertical member 33 made of angle steel welded to the protruding end of the horizontal member 32 and vertically provided downward. Outer screw holes 311 and 311 are formed in the middle portion and the lower portion of the outer vertical member 31 respectively, and an upper outer screw hole 321 is formed in a portion of the horizontal member 32 closer to the outer vertical member 31 . An upper inner screw hole 322 is opened in a portion close to the vertical member 33, and inner screw holes 331 and 331 are opened in the middle portion and lower portion of the inner vertical member 33, respectively.

Hereinafter, referring to FIGS. 6 to 9, the outer formwork installation process, the formwork holder mounting process, the inner formwork installation process, the concrete placing process, and the concrete casting method for the slab foundation of this embodiment. The air bubble removal process will be described in order.

First, an outer formwork installation step is performed to install the outer formwork 1 along the outer surface of the rising portion E of the slab foundation to be constructed. The installation of the outer formwork 1 is carried out by a known ordinary method, with the steel plate 12 of the outer formwork 1 facing the reinforcing bars F arranged in the base portion D and the rising portion E of the slab foundation.

Next, as shown in FIG. 6, a formwork holder attachment step is performed to attach the formwork holders 3 to the installed outer formwork 1 . The work for attaching the formwork holder 3 is carried out in a state in which the horizontal member 32 of the formwork holder 3 is placed on the upper edge of the outer formwork 1 and the outer vertical member 31 is brought into contact with the rear side of the outer formwork 1. The horizontal member 32 is screwed to the upper surface of the upper frame member 13 of the outer formwork 1 with a screw S1 passed through the upper and outer screw holes 321 of the horizontal member 32, and the screw passed through the outer screw hole 311 of the outer vertical member 31. By S2 and S3, the outer vertical members 31 are screwed to the side surfaces of the crosspiece 16 and the lower frame member 14 of the outer formwork 1, respectively.

Next, as shown in FIG. 7, an inner formwork installation step of fixing the inner formwork 2 to the formwork holder 3 and installing the inner formwork 2 along the inner surface of the rising portion E of the slab foundation to be constructed. I do. The work of installing the inner formwork 2 is carried out by turning the back plate 21 of the inner formwork 2 toward the reinforcing bar F and bringing the rear side of the inner formwork 2 into contact with the horizontal member 32 and the inner vertical member 33 of the formwork holder 3 . Meanwhile, the horizontal member 32 is screwed to the upper surface of the upper frame member 23 of the inner formwork 2 with a screw S4 passed through the upper inner screw hole 322 of the horizontal member 32, and passed through the inner screw hole 331 of the inner vertical member 33. The inner vertical member 33 is screwed to the side surface of the horizontal crosspiece 26 and the lower frame member 24 of the inner formwork 2 with screws S5 and S6.

Next, as shown in FIG. 8, concrete C is poured into the installed outer formwork 1 and inner formwork 2 by a known conventional method to form the base D and riser E of the slab foundation to be constructed. A concrete placing step for placing concrete C is performed.

Next, as shown in FIG. 9, an air bubble removal step is performed to remove air bubbles in the placed concrete C along the steel plates 12 of the outer formwork 1. Next, as shown in FIG. This bubble removal step is performed by a spaging operation. In this embodiment, a metal rod-shaped body L having a metal wire wound spirally around its outer peripheral surface is inserted into concrete C, and this metal rod-shaped body L is pressed against the steel plate 12 of the outer formwork 1 while being continuously rotated. By laterally moving along the formwork 1, air bubble removal work is performed. As a result, air bubbles in the concrete C can be efficiently removed along the steel plate 12 of the outer formwork 1, and the concrete surface after formation can be finished extremely well.

After the concrete C hardens, the formwork holders 3, the outer formwork 1 and the inner formwork 2 are removed to simultaneously and integrally form the base portion and the rising portion of the slab foundation.

As described above, the method of concrete casting for a slab foundation according to the present embodiment employs a lightweight outer formwork 1 in which a steel plate 12 is attached to a dam board 11 made of wooden material, and a lightweight inner formwork 2 made of wooden material. Since it is used, it is possible to reduce the labor for the installation work of the outer formwork 1 and the inner formwork 2, and furthermore, the weight of the formwork holder 3 itself which suspends and holds the lightweight inner formwork 2 can be reduced. , the labor required for attaching the formwork holders 3 can be reduced, and concrete single-cast construction of slab foundations can be carried out much more easily than in conventional construction methods using steel forms.

Furthermore, since the method of concrete casting for a slab foundation of the present embodiment uses the outer formwork 1 in which the steel plate 12 is attached to the dam board 11 made of wood material, compared with the conventional wooden formwork, The durability of the outer formwork 1 is excellent, and it can be used repeatedly over a long period of time.

Furthermore, since the method of concrete casting for a slab foundation of the present embodiment uses the outer formwork 1 in which the steel plate 12 is attached to the dam board 11 made of wood material, compared with the conventional wooden formwork, A good concrete forming surface can be obtained. Moreover, since an aluminum-zinc alloy plated steel sheet having a thickness of 0.35 mm is used as the steel sheet 12, even if a sparing operation is performed along the steel sheet 12 in the step of removing air bubbles from placed concrete, the steel sheet 12 is The outer surface of the rising portion of the slab foundation can be finished extremely well without causing unevenness or waviness in the slab.

Moreover, the upper edge portion 121 of the steel plate 12 is bent and attached to the thickness surface of the weir 11, and the left and right side edge portions 122 of the steel plate 12 are folded back and attached to the front surface of the weir 11, so that air bubbles do not occur. It is possible to effectively prevent unevenness and waviness of the steel plate 12 not only during the punching process, but also during the process of installing the outer formwork, the process of attaching the formwork holders, and the process of installing the inner formwork.

In particular, during the process of installing the inner formwork, as indicated by arrow G in FIG. In this embodiment, the upper edge portion 121 of the steel plate 12 is bent and attached to the thickness surface of the upper edge portion of the weir plate 11, so that the load concentration causes the steel plate 12 to It is also possible to effectively prevent the occurrence of unevenness, waviness, and the like. Furthermore, the upper edge portion 121 can prevent damages and dents in the wooden dam 11 and the upper frame member 13 of the outer frame 1 due to concentration of load. The durability of the frame 1 can be further improved.

Furthermore, in the method of constructing a slab foundation in one piece with concrete according to the present embodiment, in the step of attaching the formwork holders, the horizontal members 32 of the formwork holders 3 are screwed to the upper surface of the upper frame member 13 of the outer formwork 1 from above. As a result, the work of screwing the outer vertical members 33 of the formwork holder 3 to the side surfaces of the horizontal beams 16 and the lower frame member 14 of the outer formwork 1 can be easily performed. In the formwork setting process, since the horizontal member 32 of the formwork holder 3 is screwed to the upper surface of the upper frame member 23 of the inner formwork 2 from above, the inner vertical member 33 of the formwork holder 3 is screwed from above. It is possible to easily perform the work of screwing the lateral beams 26 of the inner formwork 2 and the side surfaces of the lower frame members 24, respectively.

As described above, the single-piece concrete pouring method for a slab foundation according to the present embodiment has been described. can be implemented in In addition, any of the matters specifying the invention may be replaced with other techniques within the scope of producing the same action or effect, and the integrally configured matters specifying the invention may be constructed from a plurality of members. Alternatively, the matters specifying the invention, which are composed of a plurality of members, may be implemented in a form integrally configured.

1 outer frame 11 dam 12 steel plate 121 upper edge (of steel plate) 122 side edge (of steel plate) 13 upper frame member 14 lower frame member 15 vertical frame member 16 horizontal bar 2 inner frame 21 dam 23 upper frame Material 24 Lower frame member 25 Vertical frame member 26 Horizontal crosspiece 3 Form holder 31 Outer vertical member 311 Outer screw hole 32 Horizontal member 321 Upper outer screw hole 322 Upper inner screw hole 33 Inner vertical member 331 Inner screw hole C Concrete D Solid Bottom part of foundation E Rising part of slab foundation

Claims (5)

A concrete single-piece construction method for a raft foundation,
A rectangular dam plate made of wooden material, a steel plate attached to the front surface of the dam plate, an upper frame member and a lower frame member made of wooden material provided on the long sides of the rear surface of the dam plate, A pair of wooden vertical frame members provided on the short sides of the rear surface of the weir, and a wooden member provided parallel to the long side of the weir between the vertical frames on the rear surface of the weir. an outer formwork preparation step of preparing an outer formwork made of horizontal crosspieces made of timber;
A rectangular weir made of wooden material, upper and lower frame members made of wooden material provided on the long side of the rear surface of the weir, and short sides of the rear surface of the weir. Prepare an inner frame consisting of a pair of vertical frame members made of wooden material, and a horizontal crosspiece made of wooden material provided parallel to the long side of the weir plate between the vertical frame members on the rear surface of the weir plate. Inner formwork preparation process to
A mold for preparing a formwork holder consisting of an outer longitudinal member, a horizontal member extended laterally from the upper portion of the outer longitudinal member, and an inner longitudinal member suspended downward from the extended end of the lateral member. a frame holder preparation step;
An outer formwork installation step of installing the outer formwork along the outer surface of the rising portion of the slab foundation to be constructed;
a formwork holder attaching step of fixing the outer longitudinal member of the formwork holder to the outer formwork installed in the outer formwork installation step and attaching the formwork holder to the outer formwork;
By fixing the inner formwork to the inner vertical member of the formwork holder attached by the formwork holder attaching step, the inner mold is attached along the inner surface of the rising portion of the slab foundation to be constructed. An inner formwork installation process for installing a frame,
a concrete placing step of placing concrete in the base portion and the rising portion of the slab foundation to be constructed by pouring concrete into the installed outer formwork and inner formwork;
a bubble removing step for removing air bubbles in the concrete placed by the concrete placing step along the steel plate of the outer formwork;
A single-piece concrete construction method for a raft foundation, characterized by comprising: 2. The method of single-cast concrete for a slab foundation according to claim 1, wherein the steel plate of the outer formwork is made of an aluminum-zinc alloy-plated steel plate having a thickness of 0.3 to 0.8 mm. 3. The slab foundation according to claim 1, wherein the upper edge portion of the steel plate of the outer formwork is bent toward the thickness surface of the weir and attached to the thickness surface. Concrete one-piece construction method. 4. The steel plate of the outer formwork according to any one of claims 1 to 3, wherein the left and right side edges of the steel plate of the outer form are folded back to the side of the weir and attached to the front surface of the weir. Concrete one-piece construction method for raft foundations. Outer screw holes are formed in the middle portion and the lower portion of the outer vertical member of the form holder, respectively, and upper and outer screw holes are formed in the portion of the horizontal member closer to the outer vertical member. An upper inner screw hole is opened in a portion close to the inner vertical member, and an inner screw hole is opened in each of the middle portion and the lower portion of the inner vertical member,
In the step of attaching the formwork holder, the horizontal member is screwed to the upper surface of the upper frame member of the outer formwork with a screw passed through the upper outer screw hole of the horizontal member of the formwork holder, screwing the outer vertical members to the side surfaces of the horizontal crosspieces and the lower frame members of the outer form using screws passed through the outer screw holes of the outer vertical members;
In the inner mold frame installation step, the horizontal member is screwed to the upper surface of the upper frame member of the inner mold frame with a screw passed through the upper inner screw hole of the horizontal member of the mold holder. Claims 1 to 4, characterized in that the inner vertical members are screwed to the side surfaces of the horizontal crosspieces and the lower frame members of the inner formwork with screws passed through the inner screw holes of the inner vertical members. 1. Concrete one-piece construction method for slab foundation according to any one of the above.

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