JP2959953B2 - Method of manufacturing PC panel with stone tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a precast concrete (PC) panel in which a stone as a finishing material is previously bonded to one surface of a precast concrete (PC) panel, and more particularly to a technique for removing dirt on the surface of the stone.

[0002]

2. Description of the Related Art Conventionally, a stone tip PC is used in the following steps.
Panels were manufactured. First, in the joint dividing step, a large number of stones are arranged on a formwork bed for manufacturing a PC panel with their surface side facing down, and joints are placed between these stones to position the whole. Next, concrete is poured into the formwork which has completed the joint dividing step. When the poured concrete hardens, it is removed from the mold and the PC panel is taken out to obtain a PC panel in which the stone is firmly joined to the lower surface of the concrete. Next, the surface of the PC panel (the side where the stones are arranged) is washed with a spatula to remove dirt attached to the surface of the stones and joints. At this time, the joint material serving as the temporary spacer and the packing is removed. Then, the PC panel is dried, and a new joint material for finishing is attached to the joint portion.

[0003]

In the above-mentioned conventional method, the joint material installed on the form bed in the joint dividing step is as follows.
It is expected to function not only as a spacer between stone materials but also as a packing for preventing cement paste from leaking from the joint portion to the stone surface side when concrete is poured. However, even if the material of the joint material is devised in various ways, it does not fulfill the role of the complete packing and cannot prevent the cement paste from leaking from the joint portion to some extent. For this reason, the above-mentioned convulsion washing operation as post-processing has been very troublesome. Conventionally, a large amount of labor and time are required to manually and manually clean a stone-bonded surface of a PC panel using a spatula, and there has been a strong demand for labor saving and automation of this process.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to remove dirt due to cement paste leaking to the stone surface side and dirt originally adhering to fine irregularities on the stone surface. Reasonable stone tip P that enables removal work to be performed easily or automatically
An object of the present invention is to provide a method for manufacturing a C panel.

[0005]

SUMMARY OF THE INVENTION A stone tip PC of the present invention
The method for manufacturing a panel includes the following steps. Joint dividing step Arranging stones in the PC panel manufacturing form, installing temporary joints between these stones, and providing an ultrasonic wave blocking member at the stone interval on the upper surface side of the temporary joints. . Concrete placing step Concrete is placed in the formwork after the joint dividing step is completed. Demolding process When the poured concrete hardens, it is released from the mold and the temporary joint material is removed to obtain a PC panel in which the stone material and the ultrasonic blocking member are joined to the lower surface of the concrete. Cleaning Step The stone-arranged surface side of the PC panel after the demolding step is immersed in a cleaning liquid in an ultrasonic cleaning tank to perform ultrasonic cleaning. Joint finishing step After the ultrasonically cleaned PC panel is dried, a joint material for finishing is provided on the joint part of the stone material.

[0006]

According to the manufacturing method of the present invention, the cement paste leaked from the joint in the concrete placing step flows around the surface of the stone material and stains it. In the demolding step, the temporary joint material is removed, but the ultrasonic shielding member is left on the concrete surface of the joint part. Ultrasonic cleaning is performed in that state, and dirt attached to the stone surface or joints can be almost completely removed in a short time with high ultrasonic cleaning power. On the other hand, since the ultrasonic blocking member remains behind the joint portion of the PC panel, the ultrasonic energy of the cleaning tank does not directly reach the concrete surface of the joint portion. Therefore, the relatively soft concrete that has just hardened is not eroded by ultrasonic waves for cleaning.

[0007]

1 to 4 showing an outline of an embodiment of the present invention.
Will be described in order.

First, as shown in FIG. 1 (a), a large number of stones 3 are arranged on a formwork bed 1 for manufacturing a PC panel, with the surface thereof facing downward, and temporary joints are formed between the stones 3. The joint material 2 is installed and the whole is positioned. Next, as shown in FIG. 1 (b), an ultrasonic blocking member 4 is fitted and installed in the space between the stones 3 on the upper surface side of the temporary joint 2. As the temporary joint material 2, a plastic molded body having appropriate elasticity is suitable. Further, as the ultrasonic wave blocking member 4, for example, a member that absorbs ultrasonic waves well, such as a foamed plastic material, paper, or nonwoven fabric, is used.

Concrete Casting Step As shown in FIG. 2, concrete C is poured into the formwork after the joint dividing step is completed. Of course, appropriate rebar or the like is set in the formwork as required and concrete is poured. In this step, it is difficult to prevent the cement paste leaking from the joint portion from flowing around the surface of the stone 3 and soiling the stone surface and the joint portion.

Demolding process Although not shown in the drawing, the P
Eye bolts and the like used when lifting the C panel with a hoist are provided. When the poured concrete C has hardened, the concrete panel is removed using the eyebolt or the like, and the PC panel 5 is taken out. In this demolding step, most of the temporary joint material 2 is easily removed, but the ultrasonic wave blocking member 4 at the back of the joint portion remains bonded to the concrete C.

Cleaning Step The detached PC panel 5 is moved up to an ultrasonic cleaning tank while being lifted by a hoist or the like, and is then lowered appropriately in a horizontal posture to a position indicated by a two-dot chain line P in FIG. Until the surface side of the PC panel 5 is immersed in a cleaning liquid, ultrasonic cleaning is performed. Although the ultrasonic cleaning tank is not shown, the ultrasonic vibrator is installed at the bottom of the cleaning tank and irradiates the surface of the stone 3 of the PC panel 5 with ultrasonic waves from almost directly below. The frequency of the ultrasonic wave is preferably about 25 to 100 KHz, and the ultrasonic output is appropriately set in accordance with other cleaning conditions such as cleaning time, type and concentration of the cleaning liquid.

The cleaning effect using the ultrasonic energy is extremely large, and the dirt A adhering to the surface and joints of the stone 3 can be almost completely removed in a short time. On the other hand, since the ultrasonic wave blocking member 4 remains behind the joint portion of the PC panel 5, the ultrasonic energy of the cleaning tank does not strongly reach the concrete at the joint portion. Therefore, the relatively soft concrete that has just hardened is not eroded by ultrasonic waves for cleaning.

[0013] By the way, the removed dirt (sludge) accumulates in the ultrasonic cleaning tank, but the sludge is continuously separated by a circulation cleaning system of the cleaning liquid added to the cleaning tank and discharged to the outside of the tank. In addition, a new cleaning liquid is additionally supplied into the tank as needed.

Joint finishing step After drying the front side of the PC panel 5 which has been washed,
As shown in FIG. 4, a new joint material 6 for finishing is provided in a gap between the stone materials 3. In addition, as a drying means of the PC panel 5, natural drying, warm air drying, vacuum drying, or the like is appropriately adopted.

[0015]

As described in detail above, according to the present invention, from the joint dividing step to the joint finishing step, the PC can be rationally and smoothly set without any special and complicated processing and steps. Panels can be manufactured. In particular, the work of removing dirt such as cement paste leaked from the joint portion to the stone surface side from the joint part in the concrete placing process can be performed almost perfectly in a short time, and a series of working processes can be easily automated. . In addition, since the ultrasonic wave blocking member is disposed at the back of the joint portion and protects the concrete surface from the ultrasonic wave, the concrete which has just hardened at the time of ultrasonic cleaning and is relatively soft can be used for cleaning. No erosion by sound waves.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a joint dividing step in a method for manufacturing a stone-fronted PC panel according to one embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a concrete placing process in the embodiment.

FIG. 3 is a view showing an outline of a cleaning step in the embodiment.

FIG. 4 is a diagram showing an outline of a PC panel after a joint finishing step in the embodiment.

[Explanation of symbols]

 1 Formwork bed 2 Temporary joint material 3 Stone material 4 Ultrasonic shielding material 5 PC panel 6 Finish joint material A Dirt C Concrete

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuya Wakisaka 4-640 Shimoseito, Kiyose-shi, Tokyo, Japan Inside the Obayashi Corporation Technical Research Institute (72) Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo, Ltd. Obayashi Technical Research Institute (72) Inventor Miki Aoyama 4-640 Shimoseito, Kiyose-shi, Tokyo Obayashi Technical Research Institute Co., Ltd. (56) References JP-A-7-241830 (JP, A) JP-A-7-290416 ( JP, A) JP-A-7-112414 (JP, A) JP-A-4-8506 (JP, A) JP-A-5-138621 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B28B 1/14 B28B 1/16 B28B 11/22

Claims (1)

(57) [Claims] 1. A stone tip PC by the following steps:
A method of manufacturing a panel, comprising, as a joint dividing step, arranging stones in a form for manufacturing a PC panel, placing temporary joints between the stones, and forming an upper surface of the temporary joints. An ultrasonic wave blocking member is provided in the above-mentioned stone space, and then concrete is poured into the formwork which has completed the joint dividing step as a concrete placing step, and then concrete is placed as a demolding step After curing, the mold is removed and the temporary joint material is removed to obtain a PC panel in which the stone material and the ultrasonic wave blocking member are joined to the lower surface of concrete. After immersing the stone-arranged surface side in a cleaning liquid in an ultrasonic cleaning tank and performing ultrasonic cleaning, then, as a joint finishing step, after drying the ultrasonically cleaned PC panel, It is characterized in that a joint material for finishing is provided in the joint portion of the stonework material.