JP5893792B1 - Non-stop structure for construction of concrete and construction method - Google Patents

Abstract

The present invention provides a method in which noro does not flow out to a beam side at a joining portion when high strength and high fluidity concrete is placed on a column side and normal concrete is placed on a beam and a slab side. A beam floor 5 located at a predetermined distance from the column side is opened in a rectangular shape, and the opened beam floor cut piece 7 is erected toward the column side to stop the beam floor 5 and to provide concrete. A concrete stop such as an air fence, a formwork lath, or a metal plate is disposed at the joint. When placing the concrete on the column side, it is possible to prevent the blades passing through the mesh of the lath material and the blades flowing out from the gap between the concrete stopper and the beam floor 5 from being reliably diffused to the beam side by this weir. Noro over the weir falls and flows out of the opening 6 and does not diffuse into the beam floor. [Selection] Figure 1

Description

  The present invention adopts a high-strength, high-fluidity concrete for a column and a normal stop structure when placing concrete on a column and a method for applying concrete in the case where ordinary concrete is used for a beam or a slab. It is about.

  In recent high-rise buildings made of reinforced concrete, high-strength and high-fluidity concrete is used for columns and walls from the viewpoint of seismic strength. On the other hand, the beam and the slab (floor) are not required to have such a high strength, and ordinary concrete that can be provided at low cost is used in terms of cost.

  When constructing one building with concrete having such different strength and fluidity, first, high-strength and high-fluidity concrete is placed on columns and walls. And after concrete of a pillar and a wall hardens, normal concrete is cast in a beam and a slab. Therefore, a joint portion is formed between the high strength and high fluidity concrete of the column portion and the concrete of the beam and the slab.

  Thus, when placing high-strength and high-fluidity concrete on columns and walls, concrete stops are formed at the joints so that the concrete does not flow to the beam side. The general concrete stopping method is the method described in Patent Document 1 and Patent Document 2.

In the technique described in Patent Document 1, a lath material as a backup material is prepared, and a crimp wire mesh is attached to one surface side (column side). And the circumference | surroundings are pinched | interposed with the frame material made from stainless steel, and the mold lath material for casting of high strength and high fluidity concrete is comprised. It is necessary that the formwork lath material for joining is prepared at a concrete joining planned position before the main bars of the beam are arranged, and the main bars of the beam are inserted one by one and arranged.
And after placing the high-strength and high-fluidity concrete on the column side and curing it, cast the normal concrete on the beam and slab side, without removing the formwork lath material for joining I leave it as it is.

The technique described in Patent Document 2 is composed of a steel plate or a combination plate of steel plate and expanded metal, a PC plate, or a steel fiber reinforced concrete plate at the joint between a column and a beam for placing different kinds of concrete. A partition plate is arranged. The partition plate is divided into an upper divided piece and a lower divided piece, and is fitted into a substantially comb-shaped notch formed at one end of each so as to penetrate the upper or lower bar of the beam, and the other is superposed These end portions are coupled and integrated with a stopper such as a bolt.
Then, open the slotted washer, fit the upper or lower bar into the fitting hole, close the cut back, close the comb-shaped notch of the partition plate, and the slot will not flow out to the beam side I am doing so.

  Moreover, in the concrete stop described as the prior art of patent document 2, the air fence is utilized. In the construction method using an air fence, first, a reinforcing bar is assembled and installed in a beam formwork. After that, tube-like bodies made of cloth-drawn rubber called air fences are inserted and arranged between the beam reinforcing bars at the boundary between the columns and the beams, and air is injected into them to inflate them to form a partition by sticking them together. Is. Then, the concrete of the pillar was cast, and after it hardened, the air of the air fence was pulled out, pulled out from between the beam reinforcing bars, and then the concrete of the beam and the floor was cast.

JP 2001-115645 A Japanese Patent No. 2001-193281

In the technique shown in Patent Document 1, another crimp wire mesh is arranged on one side of a lath material which is a kind of wire mesh to form a double wire mesh, and when a high-strength, high-fluidity concrete is cast, I try not to leak. However, it is a double wire mesh and there is no denying that Noro is leaking. As described in the effect of Patent Document 1, this can only reduce the outflow of Noro.
For this reason, there has been a disadvantage that the above-mentioned slot flows out to the beam floor of the formwork beam on which ordinary concrete is placed, and that the cleaning work is very time-consuming. This is because the rebar of the beam is arranged in the beam form, and there is no gap for the operator to enter in the beam form. If the blade is left as it is, it becomes a cold joint on a part of the lower surface side of the beam, and it will be peeled and dropped in the future.

In the technique shown in Patent Document 2, etc., after the reinforcing bars are arranged in the beam formwork, the upper and lower divided pieces having comb-shaped notches are arranged, and further, the slotted washers are fitted into the reinforcing bars. These operations have been complicated.
In addition, a high fluidity Noro flows out from the slight gap between the lower divided piece and the inner surface of the beam floor to the beam floor side of the beam formwork where ordinary concrete is placed. In addition, there is a drawback that troublesome cleaning of the spilled noro has to be performed.

  Furthermore, in the technique using the air fence described as the prior art in Patent Document 2, as is clear from FIG. 8 of Patent Document 2, between the adjacent air fences on the lower side of the air fence. There was a problem that a gap was formed, a large amount of spilled out, and it took time to clean it.

Therefore, the present invention is an improvement and removal in view of the above-described problems, and is intended to provide a noro stop structure capable of reliably preventing the outflow of noro and a method for constructing concrete. is there.

The means of claim 1 adopted by the present invention to solve the above-mentioned problem is that the concrete material of the column and the concrete material of the beam and the slab are cast from the column side when the concrete having different properties is cast. has an opening rectangular shape with a beam bed was excised locations separated by a predetermined dimension, the excised rectangular Ryoyuka cut piece has a slag stopper for Ryoyuka standing upright toward the pillar side, concrete joints This is a concrete joint stop structure characterized in that a concrete stop such as an air fence, a formwork lath, or a metal plate is provided.

The means of claim 2 adopted by the present invention in order to solve the above problem is that a wedge is driven into the opening on the back side of the beam floor cut piece standing upright and the beam floor cut piece does not fall down when placing concrete. The non-stop structure for a concrete joint according to claim 1, which is configured as described above.

The means of claim 3 adopted by the present invention to solve the above-mentioned problem is that the beam form frame is connected to the column form frame and installed, and before the beam rebar is disposed in the beam form frame, opening the beam floor position from the pillar side separated by a predetermined dimension in a rectangular shape, a Ryoyuka cut pieces cut by the opening is raised toward the pillar side, the opening in the rear side of the beams floor cut piece a by implanting wedge fixing the Ryoyuka cut pieces, arranged the beam reinforcement in the beam formwork, concrete joints air fences and formwork lath to the position of the beam rebar, concrete stopper such as a metal plate, disposed, and Da設high strength and high fluidity of the concrete in the column mold, thereby removing the concrete stop after concrete curing, remove banging the wedge from below the Ryoyuka, the Ryoyuka cut piece Return it to the opening, close it, and place normal concrete in the beam formwork. A concrete joint construction method characterized by was Unishi.

Means according to claim 4 in which the present invention is adopted to solve the above problems, the lower surface side of the Ryoyuka cut pieces, mounted rotatably桟木long than the width dimension of the opening of the Ryoyuka, the concrete after casting of the pillar portion of the upright position is arranged in parallel with the longitudinal direction of the opening桟木, concrete after casting the arranged beam portion so as to close the opening of the beam bed桟木4. The method for constructing concrete according to claim 3, characterized in that is disposed so as to be joined to the lower surface of the beam floor across the opening.

In the first aspect of the present invention, the beam floor at a position away from the column side by a predetermined dimension is opened in a rectangular shape, and the opened beam floor cut piece is erected toward the column side so as to stop the beam floor. Yes. On the other hand, a concrete stopper such as an air fence, a formwork lath, or a metal plate is disposed in the concrete joint portion.
When the concrete material of the column and the concrete material of the beam and the slab are casted with different properties, noro flows out through the mesh of the lath material and noro such as metal plates and air fences. Some of them flow out of the gap between the stop member and the beam floor of the beam formwork.

Thus, in the present invention, the beam floor is opened, and the opened beam floor cut piece is erected and used as a weir to stop the gutter, so that the gutter that passes through the mesh of the lath material also flows out from the gap with the beam floor. It is possible to prevent the spread of the stagnation by the weir. Even if an amount of slag exceeding the weir flows out, it does not fall out of the opening and diffuse into the beam floor. Therefore, the work of cleaning and removing the slot is not necessary when the concrete is handed over.

  In the invention of claim 2, a wedge is driven between the beam floor cut piece and the opening so that the beam floor cut piece standing upright and opening does not fall down. If this is the case, the noro stop structure can be provided by a simple operation. In addition, when placing high-strength and high-fluidity concrete on the column side and placing normal concrete in the beam and slab parts after hardening, the wedge is struck from the bottom of the beam form and removed. Since the opening can be closed by returning the position to the opening position, no extra material is required and the operation is extremely easy.

In invention of Claim 3, it is the construction method of the concrete jointing which employ | adopted the said slot stop structure. In this construction method, first, a beam floor at a predetermined distance from the column side is opened in a rectangular shape, and the opened beam floor cut piece is erected toward the column side, and the beam floor piece and the opening are A beam floor piece is fixed by driving a wedge in between, and a beam reinforcement is arranged in the beam formwork. And concrete stops, such as an air fence, a formwork lath, and a metal plate, are arranged at the position of the beam reinforcing bar of the concrete connection part.
From such a state, high-strength and high-fluidity concrete is placed in the column mold to cure and harden the concrete. After that, the concrete stopper is removed and the wedge is tapped and removed from below the beam floor. The beam floor piece is returned to the opening to close it, and normal concrete is placed in the beam formwork. I am doing so.

  The beam floor cut-out piece functions as a slot stop in a standing posture, and functions as a part of the beam form frame when it returns to the original position of the opening. In this way, when joining high-strength and high-fluidity concrete with normal concrete, it is possible to reliably achieve a no-stop with a simple configuration, prevention of cold joints, and the provision of low-cost etc. There is an advantage, and it is not necessary to clean and remove Noro, and it is possible to greatly reduce the burden on the worker.

In the invention of claim 4, a crosspiece having a length longer than the width dimension of the beam floor opening is rotatably attached to the lower surface side of the beam floor cut piece. In this pier, when the concrete of the beam portion is handed over, the beam floor cutout arranged so as to close the beam floor opening does not easily float to the inside of the beam formwork. The pier is arranged so as to join the lower surface of the beam floor across the opening.
As described above, the beam floor cut piece is fixed by the wedge in the standing posture, and is fixed by the pier at the original return position where the opening is closed, so that a special fixing hardware or the like is unnecessary, which is convenient.

FIG. 1 is a perspective view of a column part and a beam part when a part of a side plate of a beam form is removed, showing a noro stop structure according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the top view of the beam formwork which shows the noro stop structure which concerns on one embodiment of this invention, and installed the air fence. BRIEF DESCRIPTION OF THE DRAWINGS It is the longitudinal cross-sectional view at the time of placing the high strength and high fluidity concrete of the column side which shows the slotting structure which concerns on one embodiment of this invention. It is a partial longitudinal cross-sectional view at the time of closing an opening with a beam floor cut piece according to one embodiment of the present invention.

  The configuration of the present invention will be described below based on an embodiment shown in the drawings. As shown in FIG. 1, a hoop bar 2 is wound around the main bar 1 on the column side, and a column mold 3 is built around the hoop bar. Then, the beam mold 4 is installed on the column mold 3. The beam form 4 is in a state where the beam main bars and the stirrup bars are not arranged. That is, in this state, there are no obstacles in the beam formwork 4, and the formwork construction worker can freely act.

In this state, a rectangular opening 6 is opened in the beam floor 5 of the beam mold 4 at the joint portion of the concrete separated from the column mold 3 by a predetermined distance. The opening 6 may be provided in a predetermined position in advance when the beam mold 4 is formed.
Next, the beam floor cut piece 7 cut from the beam floor 5 by forming the opening 6 is erected as shown in FIG. Then, a wedge 8 is driven from the upper side of the beam floor 5 between the rear side of the standing beam floor cut piece 7 and the opening 6 and fixed so that the beam floor cut piece 7 does not move. The wedge 8 may be driven from the lower side of the beam floor 5 in consideration of removing the concrete after placing the pillar side high strength / high fluidity concrete.

  Thereafter, as shown in FIG. 3, a beam main bar 10 in which a stirrup bar 9 is wound around the beam frame 4 is arranged and connected to the column main bar 1. Next, a large number of air fences 11 are prepared, and are inserted side by side into the beam main bar 10 so that there is no gap at a position near the column side of the standing beam floor cutout piece 7. Then, when compressed air is injected into the air fence 11, as shown in FIGS. 2 and 3, the air fence 11 expands and adheres to the adjacent ones with a predetermined pressure, and sticks around the beam main bar without any gap. It becomes like this.

At this stage, the column form 3 and the beam form 4 are fastened so that they are straight with separators, single pipe or steel pipe flap angles, clamps, etc. It has been hardened.
From such a state, first, high strength and high fluidity concrete is placed on the column side. The high-fluidity concrete is prevented from flowing to the beam side by the air fence 11 at the joint portion except for its lower end side and flowing out to the beam side. However, since a slight gap is formed between the air fences 11 and the beam floor at the lower ends of the air fences 11, a part of the high-strength and high-fluidity concrete (NORO) is formed from this gap. Leaks to the beam side.

The leaked noro is blocked by the beam floor cutout piece 7. If there is a large amount of leakage, the rope gets over the beam floor cut piece 7 and falls from the opening 6 to the lower building floor. For this reason, noro does not diffuse into the beam floor 5 of the beam mold 4.

In this way, the pillar side high-strength and high-fluidity concrete is placed, and after this is hardened, the compressed air of the air fence 11 is extracted. Then, the air fence 11 in a deflated state may be peeled off from the hardened high-strength and high-fluidity concrete.
Further, the wedge 8 is struck from below the beam floor 5 and struck into the beam form 4 to be in a free state. After that, the direction of the wedge 8 may be changed and extracted from the opening 6. At this time, it is only necessary to manually remove the slag that has partially flowed out of the opening 6 and blocked. Then, the standing beam floor cut piece 7 may be laid down and returned to the original position of the opening 6 to close the opening 6.

  Here, as shown in FIG. 4, a crosspiece 12 having a dimension longer than the groove width dimension of the opening 6 is rotatably attached to the lower surface side of the beam floor cutout piece 7. The crosspiece 12 is arranged so as to face the same direction as the longitudinal direction of the opening 6 when the beam floor cut piece 7 is in the standing state. After the beam floor cutout 7 is returned to the opening 6 and closed, the pier 12 is joined to the back side of the beam floor 5 across the opening 6 so that the beam floor cutout 7 does not float up. Has been made.

Thereafter, ordinary concrete may be placed in the beam form 4 and on the slab.
After placing this normal concrete, it may be hardened and cured to dismantle the formwork.
Thus, in the present invention, when high-strength and high-fluidity concrete is placed on the column side, and when ordinary concrete is placed on the beam side and the slab, noro is used from the column side to the beam. Since it does not flow out to the side, there is no need to clean the inside of the beam formwork, the burden on the worker can be reduced, and the construction period can be shortened.

  By the way, this invention is not limited to embodiment mentioned above, A suitable change is possible. For example, although the case where the air fence 11 is used as the stopper is described, it is also possible to employ a commonly used concrete stopper such as a metal partition plate, a lath material, or a plywood partition plate.

DESCRIPTION OF SYMBOLS 1 ... Column side main reinforcement 2 ... Hoop reinforcement 3 ... Column side formwork 4 ... Beam side formwork 5 ... Beam floor 6 ... Opening 7 ... Beam floor cut piece 8 ... Wedge 9 ... Stirrup reinforcement 10 ... Beam side main reinforcement 11 ... air fence 12 ... pier

Claims (4)

In case of hit splicing by Da設concrete different properties and concrete material of a concrete material and beam and slab pillar has a rectangular opening formed by cutting a beam floor position apart a predetermined distance from the pillar side, has a slag stopper for Ryoyuka with a rectangular Ryoyuka cut pieces described above excised standing toward the pillar side, the air fences and formwork Las, concrete stopper such as a metal plate is disposed in the concrete joint portion Non-stop structure for concrete splicing characterized by The non-stop structure for a concrete joint according to claim 1, wherein a wedge floor is driven into an opening on the back side of the beam floor cut piece standing upright so that the beam floor cut piece does not fall down when the concrete is placed. The beam form frame is connected to the column form frame and installed, and in the state before the beam reinforcement is arranged in the beam form frame, the beam floor at a predetermined distance from the column side is opened in a rectangular shape, The beam floor cut piece cut out by the opening is erected toward the column side, and the beam floor cut piece is fixed to the beam form by driving a wedge into the opening on the back side of the beam floor cut piece. Beam reinforcing bars are installed, and concrete stops such as air fences, formwork laths, and metal plates are placed at the positions of the beam reinforcements in the concrete joints, and high-strength and high-fluidity concrete is cast in the column formwork. After the concrete is hardened, the concrete stopper is removed, the wedge is removed from below the beam floor, the beam floor cutout is returned to the opening to close it, and ordinary concrete is put in the beam formwork. A concrete joining method characterized in that it is cast. A pier with a length longer than the width of the opening of the beam floor is pivotally attached to the lower surface side of the beam floor cut piece, and the pier is placed in the direction of the length of the opening when placing concrete in a standing column. When placing the concrete of the beam part arranged so as to be parallel and blocking the opening part of the beam floor , it was arranged that the pier was joined to the lower surface of the beam floor across the opening part The method for constructing concrete according to claim 3, wherein the concrete is constructed.

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