JP2976359B2 - Cast-in-place concrete construction methods and concrete formwork with concrete stops used in the practice. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast-in-place concrete construction method and a concrete formwork with concrete stopper used for carrying out the method.

[0002]

2. Description of the Related Art When constructing a cast-in-place concrete floor, the concrete to be cast uses the same concrete in terms of performance within a single casting range. For this reason, the same concrete is used for the floor portion and the column and beam portions connected to the floor portion. Therefore, when it is desired to use specific concrete for the columns and beams, the floor is also constructed with the same concrete. However, for the floor, there is a special work that is not performed on pillars and beams that is directly finished on a vast area, and there is no problem in the case of ordinary concrete with Fc = 360 kg / cm ² or less. Very high concrete, for example high strength concrete with a water binder ratio of less than 40%, concrete with cement, fly ash, blast furnace slag, etc., where the binder content exceeds 500 kg / m ² , or some thickener Is required, and when a slab is cast using such concrete, it is extremely difficult to perform direct finishing because such concrete has a very high viscosity. For this reason, the floor finishing accuracy is reduced, and irregularities may occur or the presser may not be able to be held. conventionally,
In order to avoid such difficulty in pressing, there are taken measures such as spraying water on the slab surface at the time of direct pressing, or directly spraying water to make pressing easier.

[0003]

However, the measures described in the prior art are contrary to the rational design of the right person in the right place,
The workability has not been improved, and there is almost no spraying effect at high temperatures such as in summer, and the method of directly spraying water has various problems such as deterioration of concrete quality. The present invention makes it possible to separate different types of concrete between the upper surface of a floor slab that requires direct finishing and the beams and columns that do not require direct finishing, and W / C = 40% or less for beams and columns. Even for structures that require concrete or a unit binder amount of 500 kg / m ³ or more, the floor slab can be cast with easy-to-finish ordinary concrete, thereby improving floor finishing accuracy. A new cast-in-place concrete construction method that can reduce the labor cost, material cost, and the rational design without having to design the floor with an excessive safety factor in the structural design and the floor used to implement it The purpose is to provide formwork.

[0004]

In order to achieve the above object, a cast-in-place concrete construction method of the present invention comprises:
At the boundary between the column and the beam, formwork and reinforcement are carried out using a floor formwork with a buried concrete stop weir that secures reinforcement penetrations or reinforcement joints. The part and the floor are separated from each other with different concrete.

[0005]

According to the cast-in-place concrete construction method configured as described above, the presence of the concrete dam makes it possible to separate concrete between columns, beams and floors having different required quality of concrete. In the ordinary structural design, high-strength concrete is not necessarily required for the slab portion. Therefore, high-strength concrete having a structurally required water binder ratio of 40% or less is poured into the columns and beams, and the slab is cast. It can be said that ordinary concrete, which is easy to finish directly, is poured into the part. For this reason, the portion where direct concrete holding is difficult is limited to the column and the upper part of the beam, and the slab portion can be constructed with the same workability as before.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, the construction method of the present invention will be described with reference to FIG. A buried concrete retaining weir 4 having a through-hole at the upper end of the floor or a reinforcing splice via anchoring bars is provided. The cast-in-place concrete 5 and the cast-in-place concrete 6 of the floor portion are separately punched with different concretes. The concrete stop dam 4 does not mix the concretes 5 and 6, and The two are integrated through concrete communication via the through-hole at the upper end of the floor provided at the concrete stopper 4 or through a fixing bar or the like involved in projecting toward both sides.

However, the cast-in-place concrete 5 for the pillars and beams is required to have a special quality in structure or construction, but is difficult to finish. High-viscosity concrete is cast, and as the cast-in-place concrete 6 for the floor portion, it is possible to cast ordinary concrete that is easy to finish directly.

The floor form 1 may be a half-PCa version of a discard form and a deck plate or the like on the premise of disassembly. FIG. 2 shows a longitudinal sectional view when the half PCa plate 7 is used,
The concrete retaining weir 4 is attached by being integrated with a form by retrofitting via an anchor bolt or the like or by simultaneous driving when producing a PCa plate. In the figure, reference numeral 8 denotes a reinforcing bar at the upper end of the floor where the weir 4 is pierced through the reinforcing bar through hole 9 at the upper end of the floor. 3 to 7 show variations of the above-described weir 4. FIG. 3 shows a reinforcing bar 1 fixed to a reinforcing bar level at the upper end of the floor via an anchor bolt 10 which has been previously buried in a half PCa plate 7.
1 shows a structure in which a block-shaped weir 4a protruding from the block 1 is fixed. FIG. 4 shows a comb-shaped block weir 4b fixed so that the reinforcing bar 8 at the upper end of the floor can easily penetrate through the anchor bolt 10. FIG. 5 shows an inverted comb-shaped block weir 4c fixed so that the reinforcing bar 8 at the upper end of the floor can easily penetrate through the anchor bolt 10. FIG. 6 shows a weir 4d in which steel rods 13,...
Are embedded in the half PCa plate 7. In FIG. 7, a is made of a highly rigid stainless steel, steel plate, or the like, and a weir 4e having the fixing reinforcing bar 11 protruding at the level of the upper end of the floor is buried in the half PCa plate 7, and b is a highly rigid stainless steel, steel plate, or the like. The half PCa plate 7 is buried with a weir 4f having a through hole 14 formed at the upper end of the floor. FIG. 8 is a longitudinal sectional view in the case of using the deck plate 15 on the premise of disassembly. Since the disassembly cannot be performed, as shown in FIG. 9, the fixing reinforcing bar 11 is protruded, and a high-rigidity stainless steel plate in which a reinforcing bar through-hole 14 is formed at the upper end of the floor is provided with supporting jigs 16,. To be able to stably stand.

The construction procedure using the floor form described above is as follows: once the floor form is installed, concrete of necessary quality is cast as cast-in-place concrete 5 for columns and beams, and The concrete of the cast-in-place concrete 6 is cast on the slab, and the level is adjusted with the beam portion while performing the direct finishing. In addition, the upper end of each concrete stop weir can be used as a ruler for leveling the upper end of cast concrete.

[0010]

Since the present invention is configured as described above, it has the following effects.
It is possible to separate concrete according to the required quality of columns, beams, and floors in accordance with the required quality, thereby improving the finishing accuracy of floors and reducing labor costs and material costs.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the method of the present invention.

FIG. 2 is a longitudinal sectional view showing the method of the present invention.

FIGS. 3a and 3b are front and side views of a floor formwork.

4A and 4B are front and side views of a floor formwork.

FIGS. 5a and 5b are front and side views of a floor formwork.

6A and 6B are front and side views of a floor formwork. FIG.

7A and 7B are a front view and a side view of different floor forms.

FIG. 8 is a longitudinal sectional view showing the method of the present invention.

FIG. 9 is a detailed view of members in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor formwork 2 Pillar 3 Beam 4 Concrete stop weir 4a Concrete stop weir 4c Concrete stop weir 4d Concrete stop weir 4e Concrete stop weir 4f Concrete stop weir 4g Concrete stop weir 5 Cast-in-place concrete at column and beam 6 Cast-in-place concrete at the floor 7 Half PCa version 8 Reinforcing bar at the top of the floor 9 Reinforcing bar at the top of the floor 10 Anchor bolt 11 Reinforcing bar 12 Beam 13 Steel rod 14 Reinforcing bar at the top of the floor 15 Deck plate 16 Supporting jig

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshio Nagashima 5-14 Minamisuna, Koto-ku, Tokyo Takenaka Corporation Technical Research Institute (58) Field surveyed (Int. Cl. ⁶ , DB name) E04B 1/16 E04B 5/38 E04B 5/40

Claims (8)

(57) [Claims] 1. A formwork and a reinforcing bar are provided by using a floor formwork provided with a buried concrete stop dam which secures a reinforcing bar penetration or a reinforcing bar joint at a boundary portion between a column and a beam portion. After that, the cast-in-place concrete construction method is characterized in that the columns, beams and floor are separated by different concrete. 2. A concrete stop used in the method according to claim 1, wherein a block-shaped concrete stop is provided on the half-PCa plate in advance through a landfill anchor bolt and a reinforcing bar is projected at a reinforcing bar at the upper end of the floor. With floor formwork. 3. The half PCa plate is provided with a comb-shaped concrete block weir so that a reinforcing bar at the upper end of the floor can easily penetrate through a landfilled anchor bolt in advance. Formwork with concrete stop. 4. The half PCa plate is provided with an inverted comb-shaped concrete stop dam in the form of an inverted comb so that a reinforcing bar at the upper end of the floor can easily penetrate through an anchor bolt which is buried in advance. Floor formwork with concrete stopper used for construction method. 5. A concrete stop dam having a steel rod suspended in a comb shape so that a reinforcing bar at the upper end of the floor easily penetrates from a mortar beam, and a lower part of the steel rod is buried in a half PCa plate and attached. Floor formwork with concrete stopper used for construction method. 6. The method according to claim 1, wherein the lower part of the concrete stop weir made of highly rigid stainless steel, steel plate or the like and having a reinforcing bar protruding at the level of the upper end of the floor is buried in a half PCa plate and attached. Formwork with concrete stop. 7. A concrete stopper used in the method according to claim 1, wherein the lower part of the concrete stopper weir made of highly rigid stainless steel, steel plate or the like and having a through-hole at the upper end of the floor is buried in a half PCa plate. Floor formwork. 8. A concrete stop weir provided with a fixing rebar in a highly rigid stainless steel, steel plate, or the like, a through hole in a reinforcing bar at the upper end of the floor, and a jig for supporting a standing posture is mounted on a deck plate. A floor form with a concrete stopper used in the method according to claim 1, wherein the floor form is to be placed.