JP2022061893A - METHOD FOR PRODUCING PCa PRODUCT USING CROWN VIBRATOR - Google Patents

Abstract

To provide a crown vibrator capable of compacting concrete, and simultaneously, smoothly leveling a crown so as to be finished, and a method for producing a PCa product using the same.SOLUTION: A method for producing a PCa product in which concrete is installed into a flask of the PCa product to smoothly finish a surface made into a crown has a process in which concrete is installed into the flask, thereafter, a crown vibrator obtained by connecting a smooth bottom plate longer than a short side length of the flask to a vibration device is stretched along a short side direction over the flask, and while vibrating the crown vibrator by the vibration device to compact the concrete, the smooth bottom plate of the crown vibrator is moved along a long side direction of the flask, so that the compacting of the concrete and the leveling of the surface are simultaneously performed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a top vibrator capable of compacting concrete and at the same time smoothing and finishing the top, and a method for manufacturing a PCa product using the top vibrator.

For PCa (precast) products such as PCa floor slabs, after the necessary reinforcement is applied to the formwork in factories, concrete is poured and compacted with a vibrator, etc., and the concrete hardens after a certain period of time. This makes it a PCa product. Further, in the PCa product, after the concrete is hardened to some extent and before it is completely hardened, it is necessary to smooth the surface at the top with a trowel.

For example, as a method for manufacturing a PCa product, Patent Document 1 describes a mixture obtained by kneading a concrete raw material containing water-hard cement, colored aggregate, pigment and water on a table vibrator constituting the bottom surface of a concrete placing space. The step of forming the surface layer portion of the hardened concrete having a specific gravity of 2.3 or more by pouring the mixture onto the table of the table vibrator under the vibration compacting action of the table vibrator, and the table vibrator. After stopping and the predetermined drying and hardening time elapses, lightweight concrete is further cast on the surface layer portion to form the back layer portion of the concrete hardened body having a specific gravity of 2.1 or less as the back layer of the surface layer portion. After the step and the concrete molded body having the multi-layer structure of the surface layer portion and the back layer portion are demolded, the exterior surface of the surface layer portion is subjected to surface treatment to expose a part of the color aggregate to the exterior surface. A method for manufacturing a PC panel is disclosed (see claim 1, the scope of patent claims in Patent Document 1, paragraphs [0020] to [0035] in the specification, FIGS. 1 to 4 in the drawings, etc.).

However, the PC panel manufacturing method described in Patent Document 1 is a PC panel manufacturing method for manufacturing a PC panel having a multi-layer structure with high design, and the surface of the top end not in contact with the mold is not sandblasted. For a smooth finish, it was still necessary to smooth it with a trowel.

Further, as a vibrator for compacting concrete, in addition to a normal rod-shaped vibrator, Patent Document 2 discloses that a punching metal having a large number of holes formed in a normal rod-shaped vibrator is attached to compact concrete. (Refer to FIGS. 4 to 6 and the like in the drawings of Patent Document 2).

However, since the vibrator described in Patent Document 2 can compact concrete but cannot level it, a skilled worker such as a plasterer works on the top of the concrete while separately checking the degree of hardening of the concrete. It was necessary to smooth the surface of the concrete with a trowel.

In particular, when the concrete to be cast is high-strength concrete, the aggregate does not sink, so it is necessary to press it with a wooden trowel to sink the aggregate and then finish it smooth again with a gold trowel, which is troublesome. In addition, there is a problem that only skilled workers can finish it.

Japanese Unexamined Patent Publication No. 2009-196333 Jitsufuku No. 4-54268 Gazette

Therefore, the present invention has been devised in view of the above-mentioned problems, and an object thereof is a top-end vibrator capable of compacting concrete and at the same time smoothing and finishing the top-end. The present invention is to provide a method for manufacturing a PCa product using the above.

The method for manufacturing a PCa product using the crown vibrator according to claim 1 is a method for manufacturing a PCa product in which concrete is poured into a mold of the PCa product to finish the surface to be the top smoothly. After placing concrete in the formwork, a top-end vibrator connected to a vibrating device with a smooth smooth bottom plate longer than the short-side length of the formwork is laid over the formwork along the short-side direction, and the top plate is laid. While the end vibrator is vibrated by the vibrating device to compact the concrete, the smooth bottom plate of the top vibrator is moved along the long side direction of the formwork to compact the concrete and level the surface. It is characterized by doing it at the same time.

The method for manufacturing a PCa product using the crown vibrator according to claim 2 is the method for manufacturing a PCa product using the crown vibrator according to claim 1, after placing high-strength concrete in the formwork. It is characterized by simultaneously compacting high-strength concrete and leveling the surface using a top-end vibrator.

The top-end vibrator according to claim 3 is a top-end vibrator that casts concrete into a formwork of a PCa product, compacts the concrete, and finishes the surface to be the top end smoothly, and generates a vibrating force. It is characterized by comprising a vibrating device to be vibrated and a square tube, a grooved frame, or a smooth bottom plate which is a part of an L-shaped angle, which is longer than the short side length of the formwork connected to the vibrating device.

The top vibrator according to claim 4 is the top vibrator according to claim 3, wherein the smooth bottom plate is a bottom plate of a square tube made of aluminum.

According to the inventions according to claims 1 to 4, when manufacturing a PCa product, concrete can be compacted and the surface to be the top end can be smoothed. For this reason, it is not necessary for skilled workers to determine the degree of hardening of concrete while witnessing the placement of concrete, and to smooth the surface of the top of the concrete with a trowel, and it is possible to solve the shortage of workers. At the same time, the manufacturing cost of PCa products can be reduced.

In particular, according to the invention of claim 2, the problem that the aggregate peculiar to high-strength concrete does not easily sink can be solved by evenly applying vibration to the surface of the concrete and compacted at the same time. The top surface can be finished.

In particular, according to the invention of claim 4, since the smooth bottom plate is the bottom plate of a square tube made of aluminum, it is lightweight and easy to handle, reduces the physical burden on the worker, and anyone can easily finish the surface. can.

FIG. 1 is a side view showing a crown vibrator according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of a formwork of a PCa product showing a usage state of the top vibrator of the same. FIG. 3 is a process explanatory view showing a formwork assembly process of a method for manufacturing a PCa product using a crown vibrator according to the present embodiment. FIG. 4 is a process explanatory view showing a bar arrangement process of a method for manufacturing a PCa product using the same top-end vibrator. FIG. 5 is a process explanatory view showing a concrete placing process of a method for manufacturing a PCa product using the same top-end vibrator.

Hereinafter, an embodiment of a method for manufacturing a PCa product using the crown vibrator according to the present invention will be described in detail with reference to the drawings.

First, the crown vibrator 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a side view showing a crown vibrator 1 according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a formwork K of a PCa product showing a usage state of the crown vibrator 1 according to the present embodiment. Is. In the figure, the X direction is the short side direction of the formwork K of the PCa product, and the Y direction is the long side direction. The Z direction is the vertical direction (the same applies hereinafter).

As shown in FIG. 1, the crown vibrator 1 according to the present embodiment is a device including a rod-shaped vibrator 2 and a square tube 3 connected to and fixed to the rod-shaped vibrator 2. The top-end vibrator 1 has a function of compacting the concrete C1 placed in the formwork K and smoothing the surface to be the top-end.

(Stick vibrator)
As shown in FIG. 1, the rod-shaped vibrator 2 is an electric rod-type handy type commercially available rod-shaped vibrator having no flexible resin tube portion. The rod-shaped vibrator 2 is composed of a vibrator body 21 having an electric motor 20 which is a vibration device, a rod portion 22 attached to the tip of the vibrator body 21, a handle 23 attached to the rear end of the vibrator body 21, and the like. It is configured.

The rod-shaped vibrator 2 has a vibrating device that generates a vibrating force by rotating an eccentric weight (not shown) provided in the vibrating portion 24 of the rod portion 22 by the electric motor 20. Of course, the rod-shaped vibrator 2 is not limited to the handy type, as long as it has a vibrating device such as a high-frequency vibrator that generates a vibrating force and has a vibrating rod-shaped vibrating portion such as the rod portion 22. good.

(Square tube)
As shown in FIG. 1, the square tube 3 according to the present embodiment is an aluminum square tube having a longitudinal length of H1 and having a rectangular rectangular cross section in the longitudinal direction. As shown in FIG. 2, the square tube 3 is attached to the rod-shaped vibrator 2 so that the long side direction of the rectangular cross section is the vertical direction Z orthogonal to the formwork K so as not to bend easily. Further, the length H1 of the square tube 3 needs to be longer than the length H2 in the short side direction X of the formwork K of the PCa product because it is used by being placed on the formwork K of the PCa product.

However, the square tube 3 is not limited to the square tube made of aluminum, and may be a metal strip such as a grooved frame having a predetermined strength such as an ordinary steel material or an L-shaped angle. That is, the member connected to the vibrator vibrating device according to the present invention is a strip material capable of transmitting the vibration of the vibrator to the concrete, and the bottom surface capable of leveling the surface of the top end of the concrete is smooth and smooth. It suffices to have a bottom plate.

Further, as shown in FIGS. 1 and 2, the rod-shaped vibrator 2 and the square tube 3 are firmly connected and fixed by the rod portion 22 and the connecting metal fitting 4, the handle 23 and the binding band 5, respectively, and the rod-shaped vibrator is fixed. It is configured to transmit the vibration generated in 2 to the square tube 3.

As the top-end vibrator 1, a commercially available rod-shaped vibrator 2 to which an aluminum square tube 3 is connected has been illustrated and described. However, the top-end vibrator 1 is not limited to a commercially available vibrator, and has a smooth bottom plate having a smooth bottom surface directly in a vibrating device that generates a vibrating force, and is longer than the length H2 in the short side direction X of the formwork K. Metal strips may be connected.

Next, with reference to FIGS. 2 to 5, a method for manufacturing a PCa product using the crown vibrator 1 according to the embodiment of the present invention (hereinafter, also simply referred to as a method for manufacturing a PCa product) will be described. As a PCa product, a PCa floor slab will be illustrated and described. Of course, the PCa product is not limited to the PCa floor slab, and is applicable to the PCa product in which concrete is cast and hardened in advance at a factory or the like, manufactured, and transported to the site.

(1. Formwork assembly process)
As shown in FIG. 3, in the method of manufacturing a PCa product according to the present embodiment, first, a formwork assembly step of assembling a formwork K having a rectangular shape in a plan view of a PCa floor slab is performed. FIG. 3 is a process explanatory view showing a formwork assembly process of a method for manufacturing a PCa product using a crown vibrator according to the present embodiment.

(2. Reinforcing process)
As shown in FIG. 4, in the method of manufacturing a PCa product according to the present embodiment, next, a reinforcing bar arrangement step of arranging a predetermined reinforcing bar S (deformed steel bar) in the formwork K assembled in the formwork assembly process. I do. FIG. 4 is a process explanatory diagram showing a bar arrangement process of the method for manufacturing a PCa product according to the present embodiment.

(3. Concrete placing process)
As shown in FIG. 5, in the method for manufacturing a PCa product according to the present embodiment, next, a concrete placing step of placing concrete C1 in a formwork K in which a predetermined reinforcing bar S is arranged is performed. FIG. 5 is a process explanatory view showing a concrete placing process of the method for manufacturing a PCa product according to the present embodiment.

In this process, high-strength concrete C1 is placed. High-strength concrete is defined as "concrete with a design standard strength of 50 to 100 N / mm ² " in the standard concrete specifications of the Japan Society of Civil Engineers. As described in the background technique, when the concrete to be cast is high-strength concrete, there is a problem that the aggregate is difficult to sink. Of course, it goes without saying that concrete of normal strength may be placed in this step.

Generally, when concrete is placed, a handy type electric vibrator such as a rod-shaped vibrator 2 or a high-frequency vibrator is used to compact the concrete while placing it to sink the aggregate. However, when placing high-strength concrete, such a rod-shaped vibrator alone can sink the aggregate only in the immediate vicinity of the portion where the rod-shaped vibrator is inserted. For this reason, when placing conventional high-strength concrete, it is necessary to press it with a wooden trowel to sink the aggregate in order to erase the trace of inserting the rod-shaped vibrator, and then finish it again with a gold trowel to make it smooth. there were.

(4. Top finishing process)
Also in the method for manufacturing a PCa product according to the present embodiment, concrete is poured and the concrete is compacted using a general rod-shaped vibrator such as the rod-shaped vibrator 2 described above, as in the conventional case. However, as shown in FIG. 2, in the method for manufacturing a PCa product according to the present embodiment, next, the crown vibrator 1 is used to compact the high-strength concrete placed in the formwork K and to compact the crown. A top finishing process is performed to finish the surface to be smooth.

In this step, the square pipe 3 of the top vibrator 1 is bridged over the formwork K along the short side direction X, and the square pipe 3 is vibrated by a vibrating device to compact the placed high-strength concrete C1. While moving the square tube 3 along the long side direction Y of the formwork K. At this time, since the square tube 3 is made of aluminum, it is lightweight and easy to handle, reduces the physical burden on the worker, and anyone can easily finish the surface.

Further, as described above, the square tube 3 is a rectangular frame body having an effective cross section without an open end, and is placed so that the long side direction thereof is the vertical direction Z orthogonal to the formwork K. There is. Therefore, even if the square tube 3 is made of lightweight aluminum, it does not easily bend, and the top end of the PC deck can be finished smoothly without waviness or unevenness.

As described above, in this step, the surface of the placed high-strength concrete C1 is locally vibrated by the top-end vibrator 1 to sink the aggregate of the high-strength concrete C1 while the flat bottom surface of the square tube 3 is formed. Can be leveled. For this reason, it is not necessary for a skilled worker to determine the degree of hardening of the concrete while witnessing the casting of the concrete, and to smooth the surface of the top end of the concrete with a trowel. Therefore, it is possible to solve the shortage of workers and reduce the manufacturing cost of PCa products.

In addition, after this step or the end, it may be flattened again with a trowel such as a trowel and finished. This is because the top edge of the PC deck can be finished even more smoothly and neatly. However, even in that case, according to the manufacturing method of the PCa product according to the present embodiment, the aggregate does not sink unlike the conventional manufacturing method, so that the aggregate is sunk by pressing with a wooden trowel. It is clear that the work load of finishing smoothly with a trowel is reduced.

According to the method for manufacturing a PCa product using the crown vibrator 1 and the crown vibrator 1 described above, when manufacturing a PCa product, even if it is high-strength concrete, the concrete is surely compacted and the top edge and the top edge are manufactured. The surface can be finished smoothly. For this reason, it is not necessary for a skilled worker to determine the degree of hardening of the concrete while witnessing the casting of the concrete, and to smooth the surface of the top end of the concrete with a trowel. Therefore, according to the method for manufacturing the PCa product, it is possible to solve the shortage of workers and reduce the manufacturing cost of the PCa product.

Further, since the square tube 3 of the top vibrator 1 is made of aluminum, it is lightweight and easy to handle, reduces the physical burden on the worker, and anyone can easily finish the surface.

The method for manufacturing a PCa product using the crown vibrator according to the embodiment of the present invention has been described in detail above, but any of the above-mentioned or illustrated embodiments is an embodiment embodied in carrying out the present invention. It is just an indication of. Therefore, the technical scope of the present invention should not be construed in a limited manner by these.

In particular, the PCa floor slab has been exemplified as a PCa product, but the present invention is not limited to the PCa floor slab, and is applicable to PCa products in which concrete is cast and hardened in advance at a factory or the like, manufactured, and transported to the site. However, since the surface of the present invention can be easily finished, the present invention can be particularly effectively applied to a plate-shaped PCa product having a large top area such as a PCa deck.

1: Top vibrator 2: Rod-shaped vibrator 20: Electric motor (vibration device)
21: Vibrator body (vibration device)
22: Rod 23: Handle 24: Vibration part (vibration device)
3: Square tube (smooth bottom)
H1: Length in the longitudinal direction of the square pipe 4: Connection fitting 5: Binding band K: Formwork (of PCa product) H2: Length in the short side direction of the formwork S: Reinforcing bar C1: High-strength concrete (concrete)

Claims (4)

It is a manufacturing method of PCa products in which concrete is poured into the formwork of PCa products to smooth the surface that becomes the top end.
After placing concrete in the formwork, a top-end vibrator having a smooth smooth bottom plate longer than the short side length of the formwork connected to the vibrating device is laid over the formwork along the short side direction. While the top vibrator is vibrated by the vibrating device to compact the concrete, the smooth bottom plate of the top vibrator is moved along the long side direction of the formwork to compact the concrete and level the surface. A method for manufacturing a PCa product using a top-end vibrator, which is characterized by simultaneously performing concrete. The top vibrator according to claim 1, wherein after placing high-strength concrete in the formwork, the top-end vibrator is used to compact the high-strength concrete and level the surface at the same time. A method for manufacturing a PCa product used. It is a top-end vibrator that casts concrete into the formwork of PCa products, compacts the concrete, and finishes the surface that becomes the top-end smooth.
It is provided with a vibrating device for generating a vibrating force and a square tube, a grooved frame, or a smooth bottom plate which is a part of an L-shaped angle, which is longer than the short side length of the formwork connected to the vibrating device. Characterized top vibrator. The top vibrator according to claim 3, wherein the smooth bottom plate is a bottom plate of a square tube made of aluminum.

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