JPH10219708A - Precast concrete block for continuous footing and continuous footing method by use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new PC block and a continuous footing method by which a continuous footing excellent in the shearing strength can be formed by sufficiently and integrally forming the blocks together with placing concrete. SOLUTION: A continuous footing is constructed by forming the beam of the continuous footing arranged in the excavated ground and integrally forming it with the concrete forming the footing placed in the excavated ground. In this case, a specified number of reinforcements 13 are embedded and fixed in the longitudinal and lateral directions respectively and a plurality of anchor bolts 14 are embedded and fixed so as to vertically pierce the concrete. And level-adjusting nuts are screwed on the lower ends of the anchor bolts 14. And further, a plurality of recesses 16 extending breadthwise are continually provided at the lower ends thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete block used for a fabric foundation of a building and a fabric foundation method using the precast concrete block.

[0002]

2. Description of the Related Art Conventionally, a method of constructing a cloth foundation by placing concrete on a formwork assembled on site has been generally used, but it takes a long time to cure and harden the formwork and the cast concrete. was there.

[0003] In order to solve this problem, several types of precast concrete (PC) blocks having reinforcing bars are produced in a factory in advance, and if necessary, these are combined and arranged on a construction floor for root cutting, and the root cutting is performed. A method of casting a concrete and fixing it on a cloth basis has been put to practical use. According to this method, concrete is cast using the root shape as a formwork, so that work for the formwork is not required, and the amount of cast concrete is significantly reduced, so that the entire curing time is reduced. Is also shortened.

[0004]

However, most conventional PC blocks for fabric foundation have a generally inverted T-shaped cross-section in which a beam and a footing are integrally formed, and the handling is inconvenient due to the increased weight. Also, due to its shape, it is difficult to carry a large number on a carrier at a time even when transported by a truck or the like, resulting in poor work efficiency and transport efficiency.

On the other hand, a PC block having only a beam portion is factory-produced, and the PC block is supported on a construction floor at the root cutting by using a spacer or a dice, and concrete is poured from the construction floor to the lower end of the PC block. By doing PC
Forming a footing portion while integrating it with a block is also performed.

[0006] Such a PC block having only a beam portion is relatively lightweight and has a substantially flat shape, so that workability is good and transport efficiency is excellent. However,
A member such as a spacer is required to support the PC block in a state of being floated on the construction floor, and it is difficult to adjust the level of each PC block.

Further, when pouring concrete into a root cut after arranging a PC block, it is difficult to circulate the concrete to the opposite side of the PC block.
Since the integration of the PC block and the cast concrete was insufficient, the shear strength was poor.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned problems of the prior art, and provides a new fabric base having excellent shear strength by being sufficiently integrated with cast concrete. The purpose is to provide a simple PC block.

That is, the precast concrete block for a fabric foundation according to the present invention is arranged in a root cut to form a beam portion of the fabric foundation, and is cast into the root cut and integrated with concrete forming a footing portion of the fabric foundation. The reinforcement is reinforced by embedding a predetermined number of reinforcing bars in each of the vertical and horizontal directions, and a plurality of anchor bolts are buried and fixed vertically, and a lower end of the anchor bolts An adjusting nut for adjusting the level of the precast concrete block is screwed into the precast concrete block, and a plurality of recesses extending in the width direction are intermittently provided at a lower end of the precast concrete block. (Claim 1).

In the precast concrete block for fabric foundation according to the second aspect, a lifting jig is attached to the upper end of the anchor bolt.

In the precast concrete block for a cloth foundation according to a third aspect of the present invention, the vertical bars of the reinforcing steel bar protrude from the lower end of the precast concrete block, and the tip thereof is bent in a substantially L-shape.

In the precast concrete block for a cloth foundation according to a fourth aspect of the present invention, at the longitudinal end of the precast concrete block, the tip of the transverse bar of the reinforcing bar is bent in an L shape and protrudes from the inner surface of the precast concrete block.

[0013] The present invention also relates to a fabric foundation method using the above precast concrete block, wherein the precast concrete block for fabric foundation according to claim 1 is floated on a construction floor formed at a root cutting portion and is substantially continuous. After adjusting the level of these precast concrete blocks using an adjusting nut, concrete is poured into the root cutting portion at least to the upper end position of the lower end concave portion of the precast concrete block, and the poured concrete is placed. It is cured and hardened to be integrated with the precast concrete block (claim 5).

According to another aspect of the present invention, there is provided a fabric foundation method according to the present invention, wherein the precast concrete block for fabric foundation according to claim 3 is floated on a construction floor formed at a root cutting portion and arranged substantially continuously. After adjusting the level of these precast concrete blocks using an adjusting nut, concrete is poured into the root cutting portion at least to the upper end position of the lower concave portion of the precast concrete block, and the poured concrete is cured and hardened. It is characterized in that it is integrated with the precast concrete block and at the same time with the vertical reinforcing bars.

According to still another aspect of the present invention, there is provided a fabric foundation method according to the present invention, wherein the precast concrete block for fabric foundation according to claim 4 is placed in a floating state on a construction floor formed at a root cutting portion, and the adjacent precast concrete block is placed. The blocks are connected to each other by bundling the reinforcing bars for L-shaped joints by any means, and after adjusting the levels of these precast concrete blocks by using an adjusting nut, concrete is added to the root cutting portion at least of the precast concrete blocks. The cast concrete is cast to the upper end position of the lower end concave portion, and the cast concrete is cured and hardened to be integrated with the precast concrete block (claim 7).

In the cloth foundation method of the present invention, it is preferable that a second reinforcing reinforcing bar for reinforcing the cast concrete is previously placed in a state of being floated on the construction floor (claim 8). According to a particularly preferred aspect, the precast concrete block for a cloth foundation according to claim 3 is used, and the second reinforcing reinforcing bar having a lattice shape is suspended substantially horizontally by an L-shaped tip portion thereof. By arranging, the lattice-shaped second reinforcing reinforcing bar is supported in a state of being floated between the construction floor and the precast concrete block (claim 9).

According to a preferred aspect of the fabric foundation method of the present invention, a concrete plate is constructed substantially horizontally at the root cutting portion to form a construction floor (claim 10).

According to another preferred embodiment, crushed stones or gravel are spread on the root bottom of the root cutting part, and a concrete plate is constructed substantially horizontally to form a construction floor (claim 11).

When the construction floor is formed by concrete plates,
It is preferable to apply the concrete plate via cushion sand (claim 12).

In the fabric foundation method of the present invention, after a precast concrete block is arranged on a construction floor at a predetermined level, a form plate is erected on the outer surface of the precast concrete block at a predetermined interval in close contact with the construction floor. However, the amount of cast concrete can be restricted to be substantially constant by the form plate (claim 13).

[0021]

FIG. 1 is a perspective view showing a precast concrete block for fabric foundation according to an embodiment of the present invention. This precast concrete block (hereinafter, abbreviated as “PC block”) 10 is formed by pouring concrete into a formwork corresponding to its outer shape and curing it. It is possible to produce.

The PC blocks are prepared in various sizes and shapes in advance so that the cloth base of the building can be formed by continuously arranging the PC blocks. For example, a substantially flat PC block 1 as shown in FIG.
In addition to preparing several types having different lengths as 0, various shapes such as an L-shaped type 10a (FIG. 2), a T-shaped type 10b (FIG. 3), and a cross type 10c (FIG. 4) are prepared.

Since the basic configuration of the PC block is substantially common to various types, the PC block 10 having a substantially flat plate shape shown in FIG. 1 will be described below with reference to FIG. A grid-like reinforcing reinforcing bar 13 formed by welding and fixing a plurality of vertical bars 11 and horizontal bars 12 to each other is embedded and fixed.
A plurality of anchor bolts 14 are embedded and fixed vertically. This is because, when the PC block is produced at the factory as described above, the reinforcing steel bars 13 and the anchor bolts 14 are previously arranged at predetermined positions in the formwork, and then concrete is poured and cured and cured.
Easy to do.

The vertical bar 11 of the reinforcing bar 13 is the PC block 1
0 protrudes downward from the lower end thereof, and its tip is bent into an L-shape. The work of bending the protruding tip of the vertical streak 11 into an L-shape is performed by curing and curing concrete.
After the C block 10 is formed and integrated, it is preferable to perform the secondary process in a factory or on site. In the embodiment shown in FIG. 7, the tip of the vertical streak 11 is bent in the width direction of the PC block 10.
May be bent in the length direction.

The anchor bolt 14 also protrudes below the lower end of the PC block 10, and an adjustment nut 15 is rotatably screwed to the tip of the anchor bolt 14. As the adjusting nut 15, it is preferable to use a so-called long nut having a relatively long shaft length. The projecting length of the anchor bolt 14 is set so that the lower end of the adjustment nut 15 screwed to the anchor bolt 14 is always located below the lower end of the vertical streak 11.

Although the outer shape of the PC block 10 is a substantially rectangular flat plate, the lower end thereof has a recess 1 extending in the width direction.
6 and the projections 17 are provided intermittently to form a rib-shaped lower end.

Note that the anchor bolt 14 does not necessarily need to be threaded over its entire length, and it is sufficient that at least the lower end is threaded so that the adjusting nut 15 can be screwed. In the illustrated embodiment, an anchor bolt 14 whose upper and lower ends are threaded is used. In this case, a lifting ring 18 can be detachably attached to the upper end as shown in FIG. is there. The lifting ring 18 is removed after transporting the PC block 10 to a predetermined position.

The PC blocks 10, 10a, 10b, 10
c is used in combination according to the position of the pillar wall of the building to be built. FIG. 6 shows an example of an arrangement pattern of the PC blocks. The straight type PC block shown in FIG. 1 has a predetermined unit length (for example, 910 mm) 10, a double length 10 'thereof, and a triple length thereof. Thing 1
0 "3 types, L-type 1 in addition to these
0a, each P of T-shaped type 10b and cross type 10c
C blocks are arranged at necessary locations and allocated.

In the following, a method of forming a cloth base in an array pattern as shown in FIG. 6 using the above-described PC block will be described.
Since the blocks are basically common, the straight type PC block 10 of FIG. 1 will be described in detail with reference to the drawings as a representative.

FIG. 7 shows a basic fabric structure formed by using the PC block 10. First, the ground is excavated at a place where a cloth foundation is to be constructed to form a root cutting portion 20, and a PC concrete flat plate 21 is horizontally placed on the root cutting bottom to form a construction floor. The PC concrete board 21 has sufficient strength and thickness to stably support the load of the PC block 10. The PC concrete plate 21 improves the biting of the PC concrete plate 21 and the PC concrete plate 2
In order to facilitate the horizontal level adjustment, it is preferable to place the PC concrete board 21 after the cushion sand 22 is scattered.

The PC concrete board 21 may be placed after crushed stone or gravel is laid on the bottom of the root and then rolled, and if necessary, the cushion sand 22 is sprinkled thereon.

As described above, the PC block 10 is vertically arranged with the upper surface of the PC concrete board 21 placed horizontally at the root cutting section 20 as a working floor. As described above, since the adjusting nut 15 is present at the lowermost position of the PC block 10, the lower end of the adjusting nut 15 rides on the PC concrete plate 21, and the PC nut 10 is rotated by appropriately rotating the adjusting nut. The level can be adjusted.

The PC block 10 is connected to the PC concrete board 2
When arranging the reinforcing steel on the concrete plate 2, a second reinforcing reinforcing bar for reinforcing the cast concrete is previously placed on the concrete plate 2.
It is preferable to arrange them in a state of being floated on one.

For example, as shown in FIG. 8, the existing reinforcing reinforcing bars 23 assembled in a lattice shape using the L-shaped tips of the vertical bars 11 projecting below the PC block 10 as hooks are substantially horizontally. Hang the PC block 1 in this state.
0 is placed on the concrete plate 21. As a result, the grid-shaped second reinforcing reinforcing bar 23 is
It is supported in a state of floating between it and the C block 10. The vertical bars 11 and the grid-like reinforcing bars 23 are formed using the orthogonal joints 36.
Is connected, the reinforcing reinforcing bar 23 can be lifted reliably and stably. As the orthogonal joint, any shape can be used. In addition to the orthogonal joint 36 having the shape shown in FIG. 8, for example, an orthogonal joint 36 'having a shape as shown in FIG. 15 may be used.

After the PC block 10 is erected as described above, the root cutting portion 20 is positioned from the outside (left side in FIG. 7).
Pour ready-mixed concrete into. After the ready-mixed concrete reaches the lower end level of the PC block 10, the PC block 1
0, a concave portion 16 extending in the width direction is formed intermittently, so that the poured ready-mixed concrete is
6 and can smoothly flow to the opposite side. Thus, after the ready-mixed concrete is poured at least until it reaches the upper end level of the concave portion 16, it is cured and hardened, whereby the cloth foundation structure of FIG. 7 is formed. In the figure, reference numeral 24 indicates a hardened concrete upper surface level. Reference numeral 25 in the drawing denotes a solid foundation provided as necessary inside the cloth foundation structure thus obtained.

In this fabric basic structure, the beam portion P
The C block 10 itself is reinforced by the reinforcing reinforcing bar 13 buried therein, and the cast-in concrete forming the footing portion is reinforced by the second reinforcing reinforcing bar 23. The vertical bars 11 and the anchor bolts 14 that are provided so as to protrude are integrated with the casting concrete, and the distal ends of the vertical bars 11 are integrated with the second reinforcing bar 23 (see FIG. 8). Since the concrete is anchored into the concave portion 16 of the PC block 10 by anchoring them, the beam and the footing are integrally formed, so that the strength and the resistance are comparable to those of the conventional PC block for fabric foundation in which the beam and the footing are integrally manufactured. It has a load characteristic.

FIG. 9 shows a specific example of means for suspending the second reinforcing bar 23 on the PC block 10 which is different from that of FIG. That is, a plurality of pairs of bolts 26 are fixed to the lower end portion (for example, the convex portion 17) of the PC block 10 so as to project outward on both sides in the width direction.
The second reinforcing reinforcing bar 23 is suspended via the second reinforcing bar.

FIG. 10 shows an example of concrete means for joining the PC blocks 10 in the longitudinal direction. In this specific example, a reinforcing reinforcing bar 13 embedded and fixed in the PC block 10 at the longitudinal end of the PC block 10 is used.
The reinforcing bar 19 for an L-shaped joint is integrally welded and fixed to the tip of the horizontal bar 12 of the PC block 10, and the tip of the reinforcing bar 19 for the joint projects from the inner surface of the PC block 10. This is manufactured by previously welding and fixing an L-shaped joint reinforcing bar 19 to the tip of the transverse bar 12 of the reinforcing bar 13 on a form when the PC block 10 is formed into concrete, and then casting concrete into the form. can do. Without using the L-shaped joint reinforcing bar 19, the horizontal bar 12
May be bent in an L-shape to protrude from the inner surface of the PC block 10.

After the PC blocks 10 are sequentially arranged at the predetermined height on the root cutting portion 20 in the manner described above, the L-shape protruding from the inner surface near the butting ends of the adjacent PC blocks 10, 10 is provided. Reinforcing bar 1
9 and 19 are connected to each other with optional joint fitting 28 and bolt 2
The joints 9 and 29 are used, and a seal 30 is applied to the joint from the outside to complete the joint between the PC blocks 10.

In actual foundation work, first, an L-shaped PC block 10a is first placed at a corner of the foundation to be self-supporting, and a PC block 10 of the basic type or another type of PC block is disposed adjacent thereto. 10
b, 10c are arranged, and these joint ends are temporarily fixed (for example, the lower protruding ends of the anchor bolts 14 are jointed at an angle) to form an arrangement pattern as illustrated in FIG. After adjusting the height of each PC block to the same level, the temporary fixing is removed and FIG.
And then concrete is cast to form a foundation.

The PC block 10 (10a to 1a)
0c) is arbitrary, and may be, for example, an end shape as shown in FIGS.

The cloth foundation structure shown in FIG.
The root block shape is used as it is instead of the formwork. However, in order to limit the amount of cast concrete forming the footing part to a certain level and to secure the driving accuracy, the PC block 1 is used.
A mold plate can be provided outside the zero.

FIG. 11 shows an example of a fabric basic structure formed by using such a mold plate. That is, after the PC block 10 is adjusted to a predetermined height and arranged as described above, the form plate 33 is attached to the outer surface of the PC block 10 via the screw bolts 31 and the joint fittings 32. Is erected on the construction surface of the root cutting portion 20. Further referring to FIG.
The bolt 34 is inserted through an elongated hole 35 formed in the form plate 33. Therefore, the form plate 33 can be moved up and down relatively with respect to the PC block 10 by changing the insertion position of the bolt 34 in the long hole 35, and the form plate 33 stands up with no gap between the construction floor. It is possible to set up.

When the form plate 33 is erected in this way, the ready-mixed concrete poured from the inside goes around to the opposite side (outside) through the recess 16 at the lower end of the PC block 10. Since the flow is regulated, the amount of cast concrete is limited to a certain amount. At this time, the joining fitting 3
The lower level of 2 can be the upper level 24 of cast concrete.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments, but can take a wide variety of modifications within the scope of the invention described in the claims. is there.

For example, in the above embodiment, the construction surface on which the PC blocks are arranged is formed by using the PC concrete plate 21, but instead, crushed stone or gravel is laid on or above the root bottom. After rolling, the concrete may be cast to form a construction floor, and a PC block may be arranged on the construction floor. In the case where the construction floor is formed by casting the discarded concrete as described above, since leveling can be performed with high accuracy, the work of height adjustment by the subsequent adjustment nut is reduced, and the excavation is also easy. Therefore, it is a useful means when there is enough time for forming the foundation.

[0047]

According to the present invention, a fabric base structure is integrated with a concrete footing portion cast in a site by using a precast concrete block having only a beam portion excellent in workability and transport efficiency. Can be formed.

The precast concrete block of the present invention is installed on a construction floor via an adjustment nut screwed to a lower end of an anchor bolt penetrating vertically and buried and fixed, and the height is adjusted using the adjustment nut. Can be easily performed.

Further, since the precast concrete block of the present invention is provided with a concave portion extending in the width direction at the lower end portion intermittently, the concrete poured from the inside after standing at the root cutting portion is smoothly. And the footing is formed efficiently by the cast concrete in a short time.

The vertical bars and anchor bolts which are fixed to the precast concrete block and project downward therefrom are integrated with the cast concrete, and the cast concrete is anchored into the lower end recess of the precast concrete block. Since these are integrated, the beam portion and the footing portion have strength and load-bearing characteristics comparable to those of a conventional precast concrete block for fabric foundation in which the beam portion and the footing portion are integrally manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic type of a precast concrete block according to one embodiment of the present invention.

FIG. 2 is a perspective view showing an L-shaped precast concrete block according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a T-shaped precast concrete block according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a cross-type precast concrete block according to an embodiment of the present invention.

FIG. 5 is a schematic perspective view showing a state where a lifting ring is attached to an upper end of an anchor bolt of the precast concrete block of FIG. 1;

FIG. 6 is a view showing an example of an arrangement pattern in the case of forming a fabric base of a building using the various precast concrete blocks shown in FIGS. 1 to 4;

FIG. 7 is a cross-sectional view showing a fabric foundation structure formed using the precast concrete block of the present invention.

FIG. 8 is an explanatory diagram showing a state in which a second reinforcing bar is suspended from a precast concrete block.

FIG. 9 is an explanatory view showing a state in which a second reinforcing bar is suspended from a precast concrete block by means different from that of FIG. 8;

FIG. 10 is an explanatory view showing a longitudinal joint structure between precast concrete blocks.

FIG. 11 is a cross-sectional view showing a fabric foundation structure in the case where a formwork plate is used outside a precast concrete block at a root cutting portion.

FIG. 12 is a detailed perspective view showing a structure for mounting the formwork plate of FIG. 11;

FIG. 13 is a schematic diagram showing an example of a longitudinal end shape of a precast concrete block.

FIG. 14 is a schematic view showing another example of the longitudinal end shape of the precast concrete block.

FIG. 15 is a perspective view showing another example of the shape of the joint fitting used for joining the second reinforcing bar to the lower end of the reinforcing bar of the precast concrete block.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Precast concrete block of basic type 10a Precast concrete block of L type 10b Precast concrete block of T type 10c Precast concrete block of cross type 11 Vertical bar 12 Horizontal bar 13 Reinforcing bar 14 Anchor bolt 15 Adjustment nut 16 Recess 17 Convex 18 Lifting ring 19 L-shaped joint rebar 20 Root cut 21 Precast concrete plate 22 Cushion sand 23 Second reinforcing bar 24 Concrete placing level 25 Solid foundation 26 Bolt 27 Binding wire 28 Joint fitting 29 Bolt 30 Seal 31 Screw-in bolt 32 Joint fitting 33 Form plate 34 Bolt 35 Slot 36,36 'Orthogonal joint

Claims (13)

[Claims] 1. A fabric base is constructed by being arranged in a root cut to form a beam portion of a fabric foundation and being integrated with concrete that is cast into the root cut to form a footing portion of the fabric base. A predetermined number of reinforcing bars are buried and fixed in each of the vertical and horizontal directions, and a plurality of anchor bolts are buried and fixed vertically, and a lower end of the anchor bolt is used for level adjustment of the precast concrete block. A pre-cast concrete block for fabric foundation, wherein a plurality of recesses extending in the width direction are intermittently provided at a lower end of the pre-cast concrete block. 2. A precast concrete block for fabric foundation according to claim 1, wherein a lifting jig is attached to an upper end of said anchor bolt. 3. The precast concrete block for a fabric foundation according to claim 1, wherein a vertical bar of said reinforcing bar protrudes from a lower end of said precast concrete block, and a tip thereof is bent in a substantially L-shape. 4. The cloth foundation according to claim 1, wherein the end of the transverse bar of the reinforcing bar is bent in an L-shape at a longitudinal end of the precast concrete block and protrudes from the inner surface of the precast concrete block. For precast concrete blocks. 5. The construction floor according to claim 1, wherein said floor is formed at a root cutting portion.
The precast concrete blocks for the cloth foundation are floated and placed substantially continuously, and the level of these precast concrete blocks is adjusted using an adjusting nut. A cloth foundation method, wherein the concrete is cast to the upper end position of the lower concave portion of the block, and the cast concrete is cured and hardened to be integrated with the precast concrete block. 6. The construction floor according to claim 3, wherein said construction floor is formed at a root cutting portion.
The precast concrete blocks for the cloth foundation are floated and placed substantially continuously, and the level of these precast concrete blocks is adjusted using an adjusting nut. A cloth foundation method, wherein the concrete is cast to the upper end of the lower end of the block, and the cast concrete is cured and hardened to be integrated with the precast concrete block and at the same time as being integrated with the vertical reinforcing bars. 7. The construction floor according to claim 4, wherein said construction floor is formed in a root cutting portion.
The precast concrete blocks for the cloth foundation are placed in a floating state, and the adjacent precast concrete blocks are connected to each other by binding the reinforcing bars for L-shaped joints by any means, and these precast concrete blocks are adjusted using an adjustment nut. After performing the level adjustment, concrete is poured into the root cutting portion at least to the upper end position of the lower concave portion of the precast concrete block, and the poured concrete is cured and hardened to be integrated with the precast concrete block. Characterized fabric foundation method. 8. The fabric foundation method according to claim 5, wherein a second reinforcing bar for reinforcing the cast concrete is placed in a state of being floated on a construction floor in advance. 9. A grid-like second reinforcing reinforcing bar suspended substantially horizontally by an L-shaped tip of said precast concrete block for fabric foundation and placed on a construction floor so as to be placed on the construction floor. 7. The fabric foundation method according to claim 6, wherein the reinforcing steel is supported in a state of being floated between the construction floor and the precast concrete block. 10. A construction floor in which a concrete plate is constructed substantially horizontally at a root cutting portion to form a construction floor.
Any of the cloth foundation method. 11. A cloth foundation according to claim 5, wherein crushed stone or gravel is laid on the root of the root cutting part and a concrete plate is laid substantially horizontally to form a construction floor. Construction method. 12. A fabric foundation method according to claim 10, wherein said concrete plate is constructed through cushion sand. 13. After a precast concrete block is placed on a construction floor at a predetermined level, a formwork plate is closely erected on the outside surface of the precast concrete block at a predetermined interval and closely stands on the construction floor. The method according to any one of claims 5 to 7, wherein the amount of cast concrete is limited to a substantially constant amount by the following method.