JPH0674639B2 - Construction method of reinforced concrete board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a reinforced concrete disk-like body by pouring concrete onto a concrete formwork in order to build a roof or floor of a building. is there.

(Prior Art) Conventionally, as a method of constructing a reinforced concrete disk-like body as described above, as shown in Japanese Patent Laid-Open No. 61-95166, the vertical cross section of the upper and lower horizontal sections is There was a construction method using a leveling block made of concrete that was molded into a shape with a small horizontal cross-sectional area. In this construction method, a large number of the blocks are installed on a concrete formwork with a space provided therebetween, and a reinforcing bar assembly is made on the formwork, and vertical and horizontal reinforcements of this assembly are provided with intermediate portions of the blocks. After that, concrete is poured onto the formwork, the block is embedded together with the rebar assembly in this concrete, and the thickness of the concrete poured into the block is used as a mark to make the thickness of each part of the concrete uniform. ing.

[Problems to be Solved by the Invention]

In the conventional method for constructing a reinforced concrete disk-like body as described above, since the leveling block is an integrally molded concrete product, it is heavy and difficult to handle, and in addition to the vertical, horizontal and upper and lower sides of the reinforcing bar assembly. There is a problem in that the degree of freedom for arranging is small, and when the thickness of the concrete board to be placed is different, the blocks having different heights must be manufactured each time, which is a trouble.

The present invention solves the above-mentioned problems, reduces the weight of the leveling block, improves workability in transportation, mounting, etc., and also improves workability in mounting by dividing into a plurality of members. In addition, the degree of freedom for the reinforcing bar assembly can be increased, it can be securely embedded and fixed in concrete, and it can be easily adapted to the construction of concrete board bodies of different thickness. It is intended to provide a method for constructing a body.

[Means for Solving the Problems]

The method for constructing a reinforced concrete disk-shaped body according to the present invention includes a lower base having a lower rebar holding portion, an upper rebar holding portion and a block body integrally formed with a plurality of leg portions projecting below the holding portion, Using a leveling block in which the main body and the lower table are each made of a synthetic resin molded product, a number of the lower tables are fixed to the concrete formwork by holding the lower reinforcing bars in the lower reinforcing bar holding portion with mutual intervals. After that, make a rebar assembly on the formwork, support and fix the legs of the block main body on the lower stand, respectively, and hold the upper rebars in the upper rebar holding portion, and then, the main body on the formwork. Concrete is poured to a thickness substantially corresponding to the height of the entire block including the lower stand and the lower stand, and the lower reinforcing bar and the upper reinforcing bar are embedded in this concrete.

Further, another method for constructing a reinforced concrete disk-shaped body according to the present invention, in the construction method described above, the leveling block has a height adjusting member having a joint leg interposed between the lower table and the block body, The joint legs of the height adjusting member are fixed on the lower base fixed on the concrete form, and the legs of the block body are supported and fixed on these joint legs, respectively, and the main body and the height adjusting member are fixed. It is the addition of pouring concrete to a thickness that almost matches the height at which the lower stand is fixed.

[Work]

The method for constructing a reinforced concrete disk-like body according to the present invention is, after constructing a concrete formwork, nailing a lower stand of a leveling block in which a lower rebar is held by a lower rebar holding portion at a proper position on this formwork, bonding, etc. Then, the reinforcing bar assembly is provided on the formwork by arranging the reinforcing bar vertically, horizontally, and above and below, and further, the block main body is fixed on the lower stand to hold the upper rebar in these holding portions. Or the block main body holding the upper rebar is fixed on the lower stand, and in this state concrete is poured into the formwork to almost the same height as the upper surface of the main body, making it easy to use the upper surface of the main body as a mark. The thickness of concrete can be made uniform in each part. Further, in the present invention, since the lower base and the block body of the leveling block are made of synthetic resin molded products, the weight is lighter than that of the conventional concrete leveling block, and the lower platform is fixed on the formwork. After that, by fixing the main body to these, even if there is a slight error in the position of the reinforcing bar assembly bar arrangement, bend the legs of the main body or if there are many legs, By cutting off the legs of
Since the main body can be easily fixed on the lower table, the workability during transportation and assembly is good, and the degree of freedom with respect to the reinforcement is large. And since the lower table is fixed to the formwork when pouring concrete, the leveling block does not move unintentionally, and further, the lower table in the concrete, the lower and upper reinforcing bars held by the main body Since the is embedded, the lower stand and the main body will not come off when the concrete formwork is removed after the solidification of the concrete. Moreover, the lower base and the lower and upper rebars held by the main body can be used for attaching members such as a roof plate and a ceiling.

Further, in another method for constructing a reinforced concrete disk-like body of the present invention, since the height adjusting member is interposed between the lower base and the main body, the same lower base and block main body as the leveling block described above are used to increase the height. The total height of the leveling block can be easily changed by changing the number of adjusting members and the length of the connecting legs, and when the thickness of the concrete to be placed on the concrete formwork differs. Can handle.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show leveling blocks. In these figures, (1) is a lower stand, (2) is a block body, and (3) is a lid, which are synthetic materials such as polypropylene and polyethylene. It is composed of an integrally molded product of resin.

The lower base (1) is shown in FIGS. 1, 2 and 4 to 7.
As shown in the figure, a lower reinforcing bar holding portion (4) is formed in a central portion in a substantially inverted box shape, and a pair of notches (4b) opening to the lower surface are formed in the central portion of a long side wall (4a) of the holding portion (4). ) Are formed to face each other. From the side wall of the lower reinforcing bar holding part (4) to the outer peripheral side,
Six supporting portions (5) centering on the center of the lower reinforcing bar holding portion (4) are radially projected at equal angular intervals, and the supporting portion (5)
Fitting portions (6) are provided at the respective tips of the. The fitting portions (6) are connected in threes by connecting portions (7) in an arc shape centered on the center of the lower reinforcing bar holding portion (4), and the connecting portions (7) are located at positions corresponding to the notches (4b). It is divided into two by the interval arranged at. The fitting part (6) is formed with a fitting convex part (6b) protruding upward through the step (6a).

As shown in FIGS. 1 to 3 and FIGS. 8 to 10, the block body (2) has a box-shaped upper reinforcing bar holding portion (8) formed in a central portion thereof. A pair of notches (8b) opening in the upper surface are formed facing each other in the central portion of the short side wall (8a) of 8). An arcuate connecting portion (10) centered on the center of the upper reinforcing bar holding portion (8) is provided on the outer peripheral side of the side wall of the upper reinforcing bar holding portion (8) via a support portion (9). The connecting portion (10) is divided into two parts by an interval arranged at a position corresponding to the notch (8b), and has an outer diameter equal to the outer diameter of the connecting portion (7) of the lower table (1). There is. Six legs (11) extending from the connecting portion (10) of the main body (2) to the fitting portion (6) of the lower base (1) at equal intervals in the circumferential direction are equal in length to each other. Is projected. Legs (11) that come into contact with the step (6a) of the fitting part (6)
The fitting recess (11b) is formed upward from the lower end (11a) of the fitting, and the fitting projection (6b) between the fitting recess (11b) and the fitting part (6).
Are fitted and the main body (2) is fixed on the step (6a) of the lower table (1).

As shown in FIGS. 1 to 3, the lid body (3) is provided with an upper reinforcing bar on the lower surface of a flat rectangular cover plate (3a) covering the upper opening of the upper reinforcing bar holding portion (8) of the main body (2). A fitting frame (3b) that fits on the inner circumference of the side wall of the holding portion (8) is formed. Incidentally, the lid body (3) is destroyed by being hit from above while being attached to the upper reinforcing bar holding portion (8).

Figures 11a and 11b show the lower rebar. In the lower rebar (12), the upright portions (12b) are bent from both ends of the intermediate portion (12a), and both end portions of the same length from the lower end of the upstanding portion (12b) are parallel to the intermediate portion (12a) ( 12c) is bent.

12 a, b, 13 a, b and 14 a, b show different upper reinforcing bars, respectively. Upper bar (1
3), the downward portions (13b) are bent from opposite ends of the intermediate portion (13a) in opposite directions to hang down, and the downward portions (13b)
Both ends (13c) shorter than this are bent in parallel with the middle part (13a) from the lower end of the. The upper reinforcing bar (13) shown in FIGS. 13 (a) and 13 (b) has downward portions (13b) of different lengths hung from both ends of the intermediate portion (13a).
4 The upper rebar (13) shown in Figs. A and b has a downward facing portion (13) that is inclined so that the lower ends of the intermediate portion (13a) come close to each other.
b) is bent. In addition, in Fig. 13 a, b,
14 Shapes of the upper rebar (13) shown in Figs.
It is similar to that shown in FIG. 12 a, b, and FIG. 13 a, b,
The same reference numerals as those in FIGS. 12A and 12B in FIGS. 14A and 14B indicate corresponding portions.

Next, a method of constructing a reinforced concrete disk-like body using the leveling block described above will be described.

As shown in FIG. 17, a large number of temporary columns (14) are erected,
A frame plate (15) of a temporary concrete formwork made of plywood or the like is fixed on these columns (14) by inclining vertically. After that, the middle portion (12a) of the lower reinforcing bar (12) is press-fitted into the notch (4b) provided in the long side wall (4a) of the lower reinforcing bar holding portion (4) of the lower table (1), and the lower reinforcing bar ( 12) lower stand (1)
And the upright part (12b) of the lower rebar (12).
And both ends (12c) are projected to the outside of the lower reinforcing bar holding part (4) and arranged at the interval of the connecting part (7) (see FIGS. 2 and 4). In this state, the connecting portion (7) is supported on the frame plate (15) and fixed to the frame plate (15) by nailing or the like. Next, as shown in Figs. 17 and 18, vertical and horizontal bar arrangements (16
A) and (16b) are made orthogonal to each other and are arranged in a plurality of upper and lower stages to form a reinforcing bar assembly (16) on a frame plate (15). In this case, the lower stand (1) has a large number of vertical and horizontal bars (16a), (1
6b) shall be placed at an appropriate interval inside. further,
The fitting recesses (11b) provided on the leg parts (11) of the block body (2) are fitted from above into the fitting projections (6b) provided on the fitting part (6) of the lower table (1), respectively. By supporting the lower end portion (11a) of the leg portion (11) on the step (6a) of the fitting portion (6), the main body (2) is fixed on the lower table (1). Then, the intermediate portion (13a) of the upper reinforcing bar (13) shown in FIGS.
The upper rebar (13) is held in the main body (2) by press-fitting into the notches (8b) provided in both side walls (8a) of the upper rebar holding portion (8) of the main body (2), and the upper rebar is also held. The downward portion (13b) and both end portions (13c) of the (13) are projected outside the upper reinforcing bar holding portion (8) and are arranged in the space of the connecting portion (10) (second).
As shown in FIGS. 3A and 3B), the leveling block (17) is assembled on the form (15). In this case, the upper rebar (13) is located directly above the middle part (12a) of the lower rebar (12).
It is preferable that the intermediate portions (13a) of the above are arranged in parallel.
Both ends (12c) and (13c) of the lower and upper reinforcing bars (12) and (13) are supported above and below any of the vertical and horizontal reinforcing bars (16a) and (16b), and these reinforcing bars ( 16a) and (16b) are positioned,
The bar arrangements (16a) and (16b) and the lower and upper reinforcing bars (12) and (13) may be fixed to both ends (12c) and (13c) by appropriate means. Further, as shown in FIG. 15 and FIG. 16, the fitting frame (3b) of the lid body (3) is fitted onto the side surface of the upper reinforcing bar holding portion (8) of the main body (2) from above to cover the lid body (3). The cover plate (3a) covers the upper opening of the upper reinforcing bar holding portion (8). In this case, it is preferable that the upper surfaces of the cover plate (3a) and the main body (2) are located on the same plane.

Note that, in FIGS. 17 and 18, the case where the upper reinforcing bar (13) shown in FIGS. 12a and 12b is used has been described.
Depending on the configuration of 6), the upper reinforcing bar (13) shown in FIGS. 13a and 13b or 14a and 14b is used. Alternatively, the upper reinforcing bar (13) may be fitted in the upper reinforcing bar holding portion (8) in advance and then the block body (2) may be fitted in the lower stand (1). Furthermore, when there is a slight error in the positions of the reinforcing bars (16a) and (16b) of the reinforcing bar assembly (16), when the legs (11) of the block body (2) interfere with the reinforcing bars, As long as the number of interfering legs (11) is a small number such as one or two, they may be bent slightly or cut by an appropriate means, and the position of the block body (2) with respect to the lower table (1) may be set to these positions. Rotate around the axis of, that is, lower rebar (1
The upper rebar (13) may be angled with respect to 2) so as not to be parallel but to cross over, so as to avoid interference with the legs (11).

As for the leveling blocks (17) assembled on the frame plate (15) of the concrete formwork as described above, a large number of blocks are arranged vertically and horizontally with mutual intervals. After that, by pouring concrete (18) onto the frame plate (15), the lower stand (1) and the main body (2) of the block (17), the lower and upper reinforcing bar holding portions (4), (8) thereof. The lower and upper rebars (12) and (13) that are held by the above, the parts projecting from the holding parts (4) and (8), and the rebar assembly (16) are embedded in the poured concrete (18) to make concrete. Is placed in a board shape. In this case, the concrete (18) has a thickness equal to or slightly smaller than the height of the blocks (17) with the upper surface of the block (17) as a mark. Although not shown, the frame plate (1
A temporary weir board is raised around the area 5) to prevent the concrete (18) from flowing out of the frame board (15). Further, when the concrete (18) is placed, its upper surface is positioned slightly below the upper surface of the main body (2) so that the concrete (18) does not flow into the upper reinforcing bar holding portion (8). (3) may be omitted, and by further attaching a sheet or the like in place of the lid body (3) to the upper surface of the block body (2) in advance, the concrete (18) is fixed to the upper reinforcing bar holding portion (8). You may not let it flow in.

The concrete (18) immediately after being placed on the frame plate (15) has fluidity, but the lower base (1) of the block (17) is fixed to the frame plate (15) and the main body (2) is also fixed. Since the lower and upper reinforcing bars (12) and (13) are supported by the reinforcing bars (16a) and (16b) of the reinforcing bar assembly (16), the block (17) tries to flow down the concrete (18). Almost no displacement even under load. And block (1
7) gives resistance to the flow of concrete (18),
Helps prevent thickening of the sloping bottom concrete (18).

When the concrete formwork including the frame plate (15) is removed after the concrete (18) is hardened and the upper reinforcing bar holding portion (8) of the main body (2) is covered with the lid body (3) or sheet. Then, the lid (3) is struck to break it or peel off the sheet to remove them. By doing so, the middle portion (13a) of the upper rebar (13) is provided in the upper rebar holding portion (8) having a substantially box shape.
Since the part protruding from the upper reinforcing bar holding part (8) of the upper reinforcing bar (13) is embedded in the concrete (18),
Anchor (not shown) on the middle part (13a) of the upper rebar (13)
A support member (19) such as a metal rafter supported on the concrete (18) is fixed via the support member (1).
The roof (20) can be roofed on 9). In addition, the middle portion (12
a), and the part protruding from the lower reinforcing bar holding part (4) of the lower reinforcing bar (12) is embedded in the concrete (18), so a hanging member or the like is provided in the middle part (12a) of the lower reinforcing bar (12). The ceiling can be attached via.

19 to 22 show leveling blocks used in another embodiment of the present invention. 19 to 21, the same symbols as in FIGS. 1 to 10 indicate the same parts,
(21) is a height adjusting member. This height adjustment member (21)
Is molded integrally with the lower base (1) and the block body (2) with the same synthetic resin, and as shown in FIG. 22, the center of the inner ring (22) is centered on the outer peripheral side of the inner ring (22). As shown, six thin connecting rods (23) are radially projected at equal angular intervals, and joint legs (24) extending in the up-down direction are provided at the tips of the connecting rods (23). Joint leg (24)
Is the leg (11) of the block body (2) and the lower stand (1)
Of the leg portion (11), which is arranged at a position facing the fitting portion (6) of the leg portion (11) and has a fitting concave portion (24c) similar to the fitting concave portion (11b) of the leg portion (11).
Is formed, and a fitting protrusion (24b) similar to the fitting protrusion (6a) of the lower table (1) is formed at the upper end via the step (24a). Then, the fitting protrusion (6a) of the lower base (1) and the joint leg (2)
The fitting concave portion (24b) of 4) is fitted, and the fitting convex portion (24b) of the joint leg (24) and the fitting concave portion (11b) of the block body (2).
And are fitted to each other, and the main body (2) has a height adjusting member (21).
It is configured to be fixed on the lower table (1) via the. The structure of the level setting block shown in FIGS. 19 to 22 is the same as that of the level setting block shown in FIGS.

In the embodiment using the height adjusting member described above, the reinforcing bar assembly (16) is placed on the frame plate (15) of the concrete formwork as shown in FIG. Then, the fitting recess (24c) provided on the joint leg (24) of the height adjusting member (21) from above is provided on the fitting part (6) of the lower table (1). ), And the connecting legs (24)
The adjusting member (21) is fixed on the lower table (1) by supporting the lower end surface of the above on the step (6a) of the fitting part (6). Subsequently, the fitting recess (11b) provided in the leg portion (11) of the block body (2) from above is provided with the joint leg (2) of the height adjusting member (21).
The adjusting protrusions (24b) provided in (4) are fitted to each other, and the lower end portions of the leg portions (11) are supported on the step (24a) of the joint leg (24), whereby the adjusting member (21) is provided. The main body (2) is fixed on the top and the leveling block (17) is assembled.

Then, after assembling the leveling blocks (17) on the frame plate (15) of the concrete formwork, using the upper surfaces of these blocks (17) as a mark, the thickness is equal to or slightly thinner than the height of the blocks. Concrete (18) is poured.

In the embodiment shown in FIGS. 19 to 23, one height adjusting member (21) is provided for one leveling block (17).
However, when the concrete to be placed is thick, a plurality of height adjusting members (21) may be vertically connected and interposed between the lower stand (1) and the block body (2). . Then, the present invention provides a height adjusting member in which the height of the connecting leg is different depending on the thickness of the concrete to be placed, to the lower table (1).
May be interposed between the block body and the block body (2). In this case, since the number of types of concrete thickness is small, several types of height adjusting members with different joint leg heights are prepared in advance. You can leave it.

In both of the above embodiments, the fitting protrusion (6b) is attached to the lower base (1).
And a fitting recess (11b) is provided in the leg portion (11) of the block body (2), and these are provided with a height adjusting member (2) if necessary.
In the present invention, the lower base is provided with a fitting concave portion, and the leg portion of the block body is provided with a fitting convex portion, and these are fitted through a height adjusting member as necessary. By combining them, the block main body and the lower base may be positioned and fixed in the height direction, and the number of legs of the block main body can be appropriately increased or decreased.

Further, in the above-mentioned both embodiments, the case where the block is used for a roof having a slope has been described, but the leveling block according to the present invention is not limited to the one having a slope and can be applied to a horizontal roof or floor.

〔The invention's effect〕

As described above, according to the present invention, the leveling block including the lower base having the lower rebar holding portion, the upper rebar holding portion, and the block main body with the leg portion protruding below the holding portion is used. , The lower pedestal holding the lower rebar in the lower rebar holding part in place on the concrete formwork is fixed by nailing, adhering, etc., and then the rebars are arranged vertically, horizontally and above and below the formwork. An assembly is provided, and further, the block main body is fixed on the lower table so that the upper reinforcing bars are held by these holding portions, or the block main body holding the upper reinforcing bars is fixed on the lower table, and in this state By pouring concrete up to almost the same height as the upper surface of the main body, the thickness of the concrete can be easily made uniform in each part with the upper surface of the main body as a mark. Further, according to the present invention, since the lower base and the block main body of the leveling block are made of a synthetic resin molded product, the weight is lighter than that of the conventional concrete leveling block, and the lower base is a formwork. After fixing to the above, by fixing the main body to these, even if there is a slight error in the position of the reinforcing bar assembly bar arrangement, if the legs of the main body are bent or the number of legs is large By cutting off some of the legs, it can be easily fixed to the main body on the lower table, and therefore workability during transportation and assembly is good,
The degree of freedom with respect to the bar arrangement is also large. Also, since the lower table is fixed to the formwork when pouring concrete, the leveling block does not move unintentionally, and further, the lower table in the concrete, the lower table held by the main body, the upper rebar Since the is embedded, the lower stand and the main body will not come off when the concrete formwork is removed after the solidification of the concrete. Moreover, there is an effect that the lower base and the lower and upper reinforcing bars held by the main body can be used for attaching members such as a roof plate and a ceiling.

Further, according to another method for constructing a reinforced concrete disk-like body of the present invention, since the height adjusting member is interposed between the lower table and the main body, the same lower table and block body as the leveling block described above are used. By changing the number of height adjustment members and the length of the connecting legs, the total length of the leveling block can be easily changed, and when the thickness of the concrete to be placed on the concrete formwork is different. The effect is that it can be dealt with easily.

[Brief description of drawings]

FIG. 1 is an exploded front view showing a concrete leveling block used in an embodiment of the present invention, FIG. 2 is a front view of the same assembled state, FIGS. 3 and 4 are the same plan view and bottom view, FIG. 5 is a plan view of the lower base, and FIGS. 6 and 7 are fifth views.
Sectional drawing which follows the VI-VI line and VII-VII line of the figure, FIG. 8 is a top view of a block main body, FIG. 9 and FIG. 10 are FIG.
Upper sectional view taken along line IX-IX and line XX, FIG. 11 a, b
Is a front view of the lower rebar, a plan view, FIG. 12 a, b, FIG. 13 a, b,
14 a and b are front and plan views showing different upper reinforcing bars, respectively, and FIGS. 15 and 16 are sectional views corresponding to FIGS. 9 and 10 for explaining the attachment state of the lid. , First
FIG. 17 is a vertical sectional view showing a reinforced concrete board obtained by a construction method according to an embodiment of the present invention, and FIG. 18 is a partial plan view showing a state in which a leveling block is fixed on a concrete formwork, FIG. 19 is an exploded front view showing a concrete leveling block used in another embodiment of the present invention,
20 and 21 are a front view and a side view of the same assembled state, FIG. 22 is a plan view of a height adjusting member, and FIG. 23 is a reinforced concrete disc shape obtained by a construction method according to another embodiment of the present invention. It is a vertical sectional view showing a body. (1) …… Lower stand, (2) …… Block body, (3) …… Lid body, (4) …… Lower rebar holding part, (4a) …… Sidewall, (4b) …… Notch, (5) …… Supporting part, (6) …… Mating part, (6a) …… Step, (6b) …… Mating convex part, (7) …… Connecting part, (8) …… Upper rebar holding part, ( 8a) …… side wall, (8b) …… notch, (9) …… supporting part, (10) …… connecting part, (11) …… leg part, (11a) …… bottom part, (11b) …… Mating recess, (12) …… Lower rebar, (12a) …… Middle part, (12b) …… Upright part, (12c) …… End part, (13) …… Upper bar, (13a) …… Middle Part, (13b) ... downward part, (13c) ... end part, (14) ... prop, (15) ... frame plate of concrete formwork, (16) ... rebar assembly, (16a), (16b) …… Vertical and horizontal bars, (17) …… Leveling block, (18) …… Concrete, (21) …… Height adjustment Material, (22) …… inner ring, (23) …… connecting rod, (24) …… joint leg, (24a) …… step, (24b) …… fitting convex part, (24c) …… fitting Recess.

Claims (2)

[Claims] 1. A lower table having a lower reinforcing bar holding section, and a block main body integrally formed with an upper reinforcing bar holding section and a plurality of legs protruding below the holding section, each of the main body and the lower table being provided. A method for constructing a reinforced concrete board using a leveling block composed of a synthetic resin molded product, wherein a large number of the lower bases are held by a lower rebar holding section to hold the lower rebars and mutually spacing them on a concrete formwork. After providing and fixing, make a rebar assembly on the formwork, support and fix each leg of the block body on the lower stand, and hold the upper rebar in the upper rebar holding part, and then on the formwork In which concrete is poured to a thickness substantially corresponding to the height of the entire block including the main body and the lower stand, and the lower reinforcing bar and the upper reinforcing bar are embedded in this concrete. A method of constructing a crepe board. 2. A leveling block has a height adjusting member having a joint leg interposed between a lower base and a block body, and the height adjusting member is jointed on the lower base fixed on a concrete formwork. The legs are fixed, the legs of the block main body are supported and fixed on these joint legs, and concrete is poured to a thickness approximately equal to the fixed height of the main body, the height adjusting member, and the lower base. The method for constructing a reinforced concrete board according to claim 1.