JP2522712B2 - Foundation slab construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a foundation slab for a reinforced concrete structure.

[Prior Art] In recent years, in constructing a structure, an increasing number of construction methods have been adopted in which a bottom slab is used as a flat slab without an underground beam in order to reduce the depth of underground excavation.

As shown in FIG. 6 and FIG. 7, this method is applied to the spring treatment layer 3 on the upper part of the flat slab 2 formed on the underground floor 1.
Is formed, and the post-cast slab 4 is formed on the spring treatment layer 3.

Here, the spring water treatment layer 3 includes, for example, as shown in FIG. 8, by laying a plurality of blocks 5 each having a leg portion 5b protruding on one surface of the flat plate 5a, the flat plate 5a and the lower part of the block 5 are A space 6 communicating vertically and horizontally is formed between the surfaces of a slab (flat slab 2). The block 5 is usually formed to have a length and width of about several tens of cm, and is formed of, for example, a concrete block or brick so as to withstand the load placed on the upper part. Note that reference numeral 7 in the figure is a sheet laid on the top of the spring treatment layer 3 for water shielding.

In order to construct the foundation slab A by the above-mentioned construction method, after forming the flat slab 2 on the underground floor 1, a large number of blocks 5 are laid on the upper surface of the flat slab 2 with the flat plate 5a side as the upper surface, and further laid. The sheet 7 is laid on these blocks 5, and concrete is placed on the sheet 7 to form the post-casting slab 4.

[Problems to be Solved by the Invention] By the way, according to the above-mentioned means, it is possible to guide the spring water to a predetermined place for treatment by the space 6, but there are various problems as described below.

Since the plurality of blocks 5, 5, ... Constituting the spring water treatment layer 3 must bear the load of the post-striking slab 4 itself and the load applied on the post-striking slab 4, The strength of the member itself is required. Therefore, these blocks 5, 5, ... Have a certain weight formed of, for example, concrete blocks, bricks, etc., as already described. Moreover, for example, in order to secure a wider space 6 for treating the spring water, in order to secure the space,
It is necessary to lengthen the protruding length of 5b or widen the formation interval of the leg portions 5b, and in any case, in order to increase the strength, it is necessary to increase the member cross section of the leg portions 5b or the flat plate 5a, The weight of the block 5 will be further increased.

Further, in the above structure, a large number of relatively heavy blocks 5 have to be laid, so that not only a great burden is placed on the operator, but also the manufacturing cost of the block 5 itself and the transportation cost increase. Will occur.

Therefore, most recently, in place of the block 5, a method of constructing a basic slab that employs a formwork panel in which a large number of projections of the same shape are formed on one surface and the projections are formed as recesses on the other surface Is being proposed and is being implemented.

In this construction method, in order to reinforce the reinforcing bar of the post-strike slab, if the amount of reinforcing bar is small, place a plurality of bar type spacers on the upper surface of the form panel at regular intervals and place them on top of these bar type spacers. The method of arranging the reinforcing bars is adopted, and when there is a large amount of reinforcing bars, a plurality of U-shaped casters are arranged at regular intervals on the upper surface of the form panel, and the reinforcing bars are arranged on these casters. Is taken.

However, this construction method also has various problems as described below.

Since multiple spacers and casters are arranged on the upper surface of the form panel, the shape of the spacers and casters is limited by the shape of the upper surface of the form panel, which makes it difficult to obtain an arbitrary shape. It was Further, since this formwork panel is made of synthetic resin, fiber reinforced plastic, or the like, it is easy to change its shape such as bending or bending during the work, and it is limited to the upper surface of this formwork panel. There was a problem that it was difficult to arrange the casters in a stable state. Therefore, it is extremely troublesome in work and is one of the factors that reduce workability, and there is an urgent need to take immediate action.

The present invention has been made in view of the above circumstances, and is to solve the various problems described above, and further to provide a method of constructing a base slab having superior workability as compared with conventional techniques. .

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following method of constructing a basic slab.

First, on a lower slab of a reinforced concrete structure, a formwork panel having a large number of projections of the same shape formed on one surface and the projections formed as recesses on the other surface is placed. Next, a base unit made of mortar, molded concrete, synthetic resin, etc., in which a horizontal surface is formed in the upper part and a fitting part to be fitted in the concave part of the formwork panel is formed in the lower part in advance, The fitting portion of the base unit is fitted into the recess of the panel. Next, place a plurality of casters (positioning bars) for positioning the upper reinforcing bars of the spacers and slabs on the horizontal surface of the upper part of this foundation unit, arrange the reinforcing bars on these spacers and casters, and place the concrete into the upper slab. Form.

[Operation] According to the method for constructing the basic slab according to the present invention, the base slab is made of mortar, molded concrete, synthetic resin, or the like, in which a horizontal surface is formed in the upper portion and a fitting portion that fits into the recess of the formwork panel is formed in the lower portion At the construction site, after mounting the formwork panel on the lower slab of the reinforced concrete structure, the base unit is created in advance, and then the fitting part of the base unit is fitted into the recess of the formwork panel. However, spacers and casters may be arranged on the horizontal plane above the base unit. Therefore, the form panel is fixed on the lower slab by the base unit, and deformation such as bending and bending does not easily occur during the work. Further, the spacers and casters are stably arranged at optimum positions on the horizontal plane above the base unit.

[Embodiment] FIGS. 1 to 3 are views showing an embodiment of the present invention. In the figure, reference numeral B is a basic slab.

First, the configuration of the form panel 13 placed at a predetermined position on the lower slab 12 of the reinforced concrete structure will be described.

As shown in FIGS. 4 and 5, for example, the formwork panel 13 has a large number of projections 14, 14, ...
Is formed, and the convex portion 14 is a concave portion on the other surface.
It is formed into 15.

Here, the convex portion 14 has a cylindrical shape in which the base end is expanded in a conical taper shape, and the end surface 14a is a flat surface. These convex portions 14, 14, ... Are arranged at equal intervals in the vertical and horizontal directions, and between the rows and columns of the convex portions 14, 14, .. Protruding ridges 16,1
6, ... are formed vertically and horizontally. That is, this is a form in which one convex portion 14 is formed in one of the cells formed by the protrusion 16. The ridges 16 here are also similar to the protrusions 14 when viewed from the other side of the formwork panel 13.
16 is a groove 17.

Furthermore, the ridges 16 (grooves 17) formed in a grid pattern are
Intersection ridge 18 (intersection groove 19) extending at a right angle to the convex portion 14 side (concave portion 15 side) in the central portion of each side constituting one square
Has been formed.

The form panel 13 is formed in a rectangular shape having a certain size, for example, as shown in FIG. 4, and has a gutter-shaped engaging groove 20 on two adjacent sides and a locking hook 21 on the other two sides. Are formed, and the engaging groove 20 and the locking hook 21 constitute a connecting means for connecting the form panel 13 to each other.

The material of this formwork panel 13 is various synthetic resins or fiber reinforced plastics (FRP), therefore, this formwork panel 13 is used in the production of products made of these materials. It can be easily prepared by a general molding method.

Next, the basic unit 31 that fits into the recess 15 of the form panel 13 will be described with reference to FIG.

The base unit 31 is made of, for example, the same material as the lower slab 12 and is an integral unit. As shown in FIG.
And a plurality of fitting portions 33, 33, ....

The plate part 32 is a rectangular plate having a uniform thickness, and a plurality of fitting parts 33 are vertically and horizontally formed on the lower part 34 so as to project vertically outward, and a smooth horizontal surface is formed on the upper part 35. Has been formed.

The fitting portion 33 includes a cylindrical lower end portion 36 to a cylindrical upper end portion 37.
The diameter is gradually reduced to a conical shape, and is formed in a conical taper shape.

These fitting portions 33, 33, ... Are formed on the lower portion 34 of the plate portion 32 at positions corresponding to the respective concave portions 15 of the form panel 13.

The base unit 31 can be created by placing concrete using the form panel 13 as a form, curing and hardening it.

Next, the construction method of the basic slab B will be described in detail with reference to the drawings.

First, the formwork panels 13, 13, ... Are mounted on the lower slab 12, and the end faces 14a, 14a of the projecting portions 14, 14, ... Of these formwork panels 13, 13 ,.
... is placed so that it contacts the upper surface 12a of the lower slab 12. At this time, the recesses 15, 15, ... Are opened upward. Adjacent formwork panels 13 can be connected to each other by engaging the engaging groove 20 of one formwork panel 13 and the locking hook 21 of the other formwork panel 13, and these formwork panels 13 can be connected to each other. Panels 13, 13, ... Can be integrated.

Next, the fitting portion 33 of the base unit 31 having the above configuration
To the concave groove 15 of the formwork panel 13 on the side surface 33 of the fitting portion 33.
a, 33b on the side surfaces 15a, 15b of the groove 15, and the top surface 33 of the fitting portion 33.
The base unit 31 and the formwork panel 13 are joined to each other such that the c is positioned and fitted so as to correspond to the bottom surface 15c of the groove 15.

Next, the spacer 41 is placed at a predetermined position on the upper portion 35 of the base unit 31, and the reinforcing bars 42, ...
And the reinforcing bars 43, ... are arranged vertically and horizontally.

Next, the leg portions 45, 45 of the U-shaped caster 44 are placed in a predetermined position on the upper portion 35 of the base unit 31, and the rebars 47, ... And the rebars 48 ,. Arrange horizontally and vertically.

Finally, a form (not shown) is formed so as to include the above-mentioned reinforcing bars 48, ...
Concrete is poured into the inside surrounded by and the formwork, and after curing and hardening, these formwork are dismantled to construct a foundation slab B of a reinforced concrete structure.

As described above in detail, according to the method of constructing the foundation slab, on the upper surface 12a of the lower slab 12 of the reinforced concrete structure, a large number of projections 14 of the same shape are formed on one surface and on the other surface. The mold panel 13 in which the convex portions 14 are formed in the concave portions 15 is placed, and the horizontal plane is formed in the upper portion 35 and the lower portion is formed.
Since the basic unit 31 of the concrete structure in which the fitting portion 33 that fits into the concave portion 15 of the formwork panel 13 is formed in 34 in advance, at the construction site, the formwork panel 13
The fitting portion 33 of the base unit 31 is fitted in the recess 15 of the base unit 31, and the spacer 41 or the caster is placed on the upper surface 35 of the base unit 31.
It is only necessary to arrange 44, and the formwork panel 13 is fixed to the upper surface 12a of the lower slab 12 by the base unit 31 so that deformation such as bending and bending does not easily occur during work, and minor surfaces are not damaged. .

In addition, the spacer 41 and the casters 44 are the base unit 31.
The upper part of the 35 is placed in an optimal position on the horizontal plane in a stable state. Therefore, at the construction site, spacers 41 and casters
The positioning and installation of 44 can be done quickly and efficiently, and the work of arranging the reinforcing bars 42, ... can be done quickly and efficiently, and the overall work is standardized, which shortens the construction period and reduces costs. Down is possible.

The details of the method for constructing the basic slab of the present invention are not limited to those in the above-mentioned embodiment, and various modifications are possible.
As an example, after the formwork panels 13, 13, ... Are placed on the upper surface 12a of the lower slab 12 of the reinforced concrete structure, the fitting unit of the base unit 31 is placed in the recesses 15 of these formwork panels 13, 13 ,.
After mounting the formwork panels 13, 13, ... on the upper surface 12a of the lower slab 12 of the reinforced concrete structure,
It is also possible to form a horizontal plane by placing mortar on the entire upper surfaces of the form panels 13, 13, ....

In addition, the plate portion 32 of the base unit 31 has a plurality of fitting portions vertically and horizontally.
33, 33, ... are formed, the fitting portion 33 may be fitted into the recess 15 of the form panel 13 in a stable state, and the plurality of fitting portions 33, 33 ,. The arrangement is not limited to the example, and various arrangements can be adopted.

[Effects of the Invention] The present invention mounts a formwork panel on a lower slab of a reinforced concrete structure, in which a large number of projections of the same shape are formed on one surface and the projections are formed as recesses on the other surface. Place a base unit made of mortar, molded concrete, synthetic resin, etc., in which a horizontal surface is formed in the upper part and a fitting part that fits in the concave part of the formwork panel is formed in the lower part in advance, Fit the fitting part of the basic unit into the concave part of the panel, arrange a plurality of spacers and casters on the horizontal surface of the upper part of the basic unit, arrange reinforcing bars on these spacers and casters, and place concrete Since it was decided to form a slab, at the construction site, the fitting part of the basic unit is fitted into the recess of the formwork panel, and the spacer and the upper reinforcing bar of the slab are fitted to the horizontal surface of the upper part of this basic unit. It is only necessary to place casters (positioning lines) for positioning, and the formwork panel is fixed on the lower slab by the base unit, making it difficult for deformation such as bending and bending to occur during work, and damaging minor surfaces. Disappears.

In addition, the spacers and casters are stably arranged at optimum positions on the horizontal plane above the base unit. Therefore, at the construction site, spacers and casters can be positioned and installed quickly and efficiently, and reinforcement work such as rebar can be done quickly and efficiently. Can be shortened and cost can be reduced.

[Brief description of drawings]

1 to 5 are views for explaining one embodiment of the present invention. FIG. 1 is a partial sectional view of a foundation slab, FIG. 2 is an overall perspective view of a foundation unit, and FIG. Sectional views of the base unit and the form panel, FIG. 4 is a plan view of the form panel, FIG. 5 is a sectional view taken along the line III-III of FIG. 4, and FIGS. 6 to 8 are conventional examples. FIG. 6 is a side sectional view of the foundation slab, FIG. 7 is a sectional view taken along the line II-II of FIG. 6, and FIG. 8 is a perspective view of the block. B: Basic slab, 12: Lower slab, 13: Form panel, 14: Convex portion, 15: Recessed portion, 16: Recessed ridge, 17: Recessed groove, 18: Crossed ridge, 19 ...... Cross recessed groove, 20 …… Engagement groove,
21 …… Locking hook, 31 …… Base unit, 32 …… Plate, 33…
… Mating part, 34 …… Lower part, 35 …… Upper part, 36 …… Lower end part, 37
...... Upper end, 41 …… Spacer, 42,43 …… Reinforcing bar, 44 ……
Caster, 45 …… Legs, 46 …… Top, 47,48 …… Reinforcing bars.

Claims (1)

(57) [Claims] 1. A formwork panel having a large number of protrusions of the same shape formed on one surface and a depression formed on the other surface on the lower slab of a reinforced concrete structure A base unit made of mortar, molded concrete, synthetic resin, etc., in which a horizontal surface is formed and a fitting portion that fits into the concave portion of the formwork panel is formed in advance, and the base unit is formed in the concave portion of the formwork panel. Fit the fitting part of the base unit, arrange a plurality of spacers and casters on the horizontal surface of the upper part of the base unit, arrange reinforcing bars on these spacers and casters, and place concrete to form the upper slab. A method for constructing a basic slab, which is characterized in that