KR20160142111A - Hollowcore slab automation manufacturing method - Google Patents

Abstract

The present invention provides an automated production method for a finishing-integrated hollow slab, which can automatically mass-produce high-quality hollow slabs with patterns through appropriate temperature control of curing and pattern forms. The automated production method for a finishing-integrated hollow slab according to an appropriate embodiment of the present invention comprises the steps of: providing a mold system including a hollow slab casting lower mold in which hot water pipes are piped, a guide rail longitudinally disposed on the side of the hollow slab casting lower mold, and a tension device arranged on both sides in the longitudinal direction of the hollow slab casting lower mold; installing pattern forms in the longitudinal direction on a bed side of the hollow slab casting lower mold; disposing a tendon on the hollow slab casting lower mold, and tensioning the tendon using the tension device; pouring concrete into the lower mold while moving a slab-dedicated truck-mounted machine mounted on the guide rail, and installing, in the casted section, a curing tent using tent packing equipment mounted on the guide rail; adjusting the time and temperature to complete the curing of the concrete, removing the tent, and disassembling the tension of the tendon; and cutting the concrete by confirming a cutting position of the concrete corresponding to a unit length, and demolding the cut concrete.

Description

[0001] Hollowcore slab automation manufacturing method [0002]

In particular, the present invention relates to a method of producing an integral hollow hollow slab, and more particularly, to an automation of an integral hollow slab capable of mass production of a high quality hollow slab having a pattern through the combination of a patterned foam and a non- slump, Production method.

The hollow slab is a bottom plate system that improves the flexural rigidity by increasing the thickness of the slab while reducing the weight of the slab by placing a hollow part in the slab. It is a member that enables efficient and economical building design. In recent years, The application range of precast concrete is also expanding.

Typically, the precast concrete outer wall is made by casting concrete in a single mold. Such a single mold method is not suitable for mass production, and a large number of molds must be manufactured in mass production, resulting in an increase in cost. Also, in the case of general precast concrete outer wall, there is a problem that a separate post-process is required when the design finishing is required.

As a background of the present invention for solving such a design finishing deadline, Korean Unexamined Patent Publication (Kokai) No. 1997-0069271, a slab for a building exterior wall and a manufacturing method thereof have been proposed. In order to manufacture a thin plate type slab in which a hollow inner wall layer made of prestressed concrete and an outer wall layer made of a terrazzo material made of a multi-colored surface are integrally formed, this technology forms a first inner wall layer and a second outer wall layer This is a molding method in which an outer wall layer to which a raw material mixture is applied is laid.

However, since the background art can only express the color depending on the raw material mixture for forming the outer wall layer, it is impossible to mass-produce a hollow slab having various patterns desired by the constructor or the consumer.

Korean Unexamined Patent Application Publication No. 1997-0069271 (slab for building exterior wall and its manufacturing method)

It is an object of the present invention to provide a method for automated production of a hollow single-piece hollow slab capable of automatically mass-producing a high-quality hollow slab having a pattern through the combination of a patterned foam and a non-slump and a suitable temperature control of curing.

These automated production methods are classified into a slipformer (lamination) method and an extruder (pressurization) method. Here, a slipformer method is applied considering the ease of production.

A method of automated production of a closed-end hollow slab according to a preferred embodiment of the present invention,

A mold system comprising a lower mold for pouring a hot water pipe, a guide rail longitudinally disposed on the side of a lower mold for pouring a hollow slab, and a tension device arranged on both sides in the longitudinal direction of the lower mold for pouring a hollow slab ; ≪ / RTI >

Installing a patterned foam in the longitudinal direction on the bed side of the hollow mold for placing the hollow slab;

Placing a tension material in the lower mold for pouring the hollow slab and tensioning the tensioner with a tension device;

Installing a curing tent using a tent packing equipment mounted on a guide rail after placing the concrete while moving a slab-dedicated truck-type installer mounted on a guide rail to a lower mold;

Adjusting the time and temperature to complete the curing of the concrete, removing the tent, and disassembling the tension of the tent material;

And cutting the concrete after confirming the cutting position of the concrete corresponding to the unit length, and then demolding the cut concrete.

In addition, the curing of the concrete,

Raising the temperature to 50 to 60 占 폚 in about 2 to 2.5 hours so that the temperature rise does not exceed 20 占 폚 per hour before entering this curing;

Maintaining a suitable temperature of about 50 to 60 DEG C over about 6 hours with the curing;

And lowering the temperature to 30 占 폚 within 2 hours within a range not exceeding 20 占 폚 per hour after the curing is carried out.

Further, it is characterized in that it is maintained at a temperature of 20 to 25 占 폚 on the bed of the lower mold immediately before the concrete is inserted.

According to the automated production method of the closed integral hollow slab of the present invention, the pattern is formed on one side by the patterned foam after demoulding, thereby improving the appearance. In addition, since it is manufactured in an automated line method at a factory, it has an advantage that productivity can be improved, manufacturing cost can be reduced by mass production, and quality can be maintained uniformly.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an arrangement view of a lower mold for placing a hollow slab; FIG.
Fig. 2 is a state in which a patterned foam is disposed on a lower mold for pouring a hollow slab in Fig. 1; Fig.
FIG. 3 is a state in which a tensile material is arranged in FIG. 2; FIG.
Figure 4 is a production process showing the concrete pouring and curing tent installation process.
FIG. 5 is a view showing a state of manufacture of a hollow slab showing a cut surface of a poured concrete; FIG.
6 is a perspective view of a hollow slab having a pattern.
7A to 7F are various drawings of a patterned foam produced according to the automated production method of the closed-end integral hollow slab of the present invention.
8 is a graph showing the relationship between concrete time and curing temperature according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

bottom Mold  install

As shown in Fig. 1, a lower mold 10 for installing a hollow slab is installed in a manufacturing factory. A plurality of lower molds 10 for placing a hollow slab are arranged side by side in a manufacturing plant. A hot water pipe 120 for supplying hot water is piped to the lower mold 10. The hot water pipe 120 is supplied with the appropriate curing temperature (calories) necessary for curing the concrete by circulating hot water. The lower mold 10 is also provided with guide rails 14 on both sides in the longitudinal direction on which the slab-dedicated balancer-type striker 40 shown in Fig. 4 is moved and guided.

Although the basic length of the lower mold 10 is 150 m and the width of the lower mold 10 is 1.2 m in this embodiment, it can be changed depending on the quantity and width according to the unit length of the integral hollow slab 100 to be manufactured. The hot water pipe 120 is connected to an unillustrated boiler so that hot water circulates by an unshown circulation pump and the temperature of the circulating hot water is adjusted through temperature control of the boiler side controller.

And a tension device 16 for tensioning the tensile member 30 to both sides in the longitudinal direction of the lower mold 10 is provided. The tension device 16 includes a hydraulic actuator and a fixing device and is well known in the art, so that detailed description is omitted.

Pattern form  install

Then, as shown in Fig. 2, the patterned foam 20 is provided on the bed side of the lower mold 10. At this time, the pattern 20 is bolted to the lower hole of the bed so as not to move during the pouring of the concrete.

As shown in FIGS. 7A to 7F, the patterned foam 20 has a pattern 102 to be stamped on the finished integral hollow slab 100 of FIG. 6, and is not limited to the illustrated pattern. The patterned foam 20 may be a film-shaped (or sheet-like) having a predetermined thickness, for example, made of a synthetic resin having a pattern on one side. The patterned foam 20 has a unit length. Accordingly, the patterned foams are arranged in a continuous manner in accordance with the length of the lower mold. The pattern is sufficient to show various patterns which do not depend on regularity or irregularity, and it is not limited to a specific shape such as stripes, graphic patterns, rugged patterns, natural patterns, symbols and characters.

A temporary fixing adhesive for fixing the patterned foam to the mold is applied to the lower surface of the installed pattern foam 20 and a releasing agent is preferably applied to the upper surface thereof. The release agent functions to improve the appearance of the pattern obtained by the closed integral hollow slab 100 of Fig. The releasing agent is a substance having a small affinity with concrete, and may have water solubility such as pine resin, vinyl acetate, silicone, waste lubrication, paraffin wax, and vegetable oil.

Tensile seal

Next, as shown in Fig. 3, an operation is performed in which the tension members 30 are arranged in an appropriate number on the upper side of the bed of the lower mold 10 and tensioned. In this embodiment, the tensile members 30 are arranged at regular intervals from each other in the width direction and then pulled. The tensioning operation causes the tensioning device 16 to generate a uniform tension in all the tension members 30. [ After tensioning the tension member 30, it is fixed to the fixing unit to maintain tension.

Concrete pouring

Then, as shown in FIG. 4, the concrete 18 is poured into the lower mold 10.

The concrete is poured into the slab-dedicated balancer 40 placed above the lower mold 10 and moving along the guide rail 14. The casting method is applied by using a slipformer (lamination) method, and the casting is divided into two or three layers depending on the number of the hoppers. The first layer may be applied in a separate formulation so that the pattern is well visible. The slab-dedicated balancer-type striker (40) is remotely controlled to move in the longitudinal direction of the lower mold (10) at a constant speed, and the concrete is charged into the hopper from the upper portion thereof to form a concrete layer of a predetermined thickness on the lower mold I'm going. At this time, the poured concrete 18 is formed on the upper surface of the patterned foam 20.

When the concrete is poured, the bed of the lower mold 10 is preferably maintained at an appropriate temperature of about 25 캜. This is because the concrete has easy access to the curing temperature (50-60 ° C) at which the concrete is actually cured.

Curing tent installation and curing

Next, as shown in FIG. 4, a curing tent 50 is immediately installed to prevent drying of the upper surface after concrete is poured. This is made possible by covering the section where the slab-dedicated balancer-type striker 40 is laid with the curing tent 50 immediately. The curing membrane 50 can be installed using the tent packing equipment 60 mounted on the same guide rail 14 and movable. The tent pavement equipment 60 uncovers the tent 50 which is wound on the bobbin 62 while moving and covers the concrete pouring section.

After the tent installation is completed, the curing is controlled by temperature and time as shown in the graph of FIG. The temperature control is performed by controlling the temperature of the hot water supplied to the hot water pipe 120.

First, the temperature of the bed is maintained at 20 to 30 ° C for 2 hours after the concrete is poured. Therefore, the summer season can be left in the pouring state, and the winter season is maintained at 20 to 30 ° C.

Thereafter, the temperature is raised to 50 to 60 ° C in about 2 to 2.5 hours so that the temperature rise does not exceed 20 ° C per hour before entering the curing bath.

Next, with the curing process, an appropriate temperature of about 50 to 60 ° C is maintained over about 6 hours.

Then, after the curing, the temperature is lowered to 30 DEG C within 2 hours. At this time, it is preferable that the temperature lowering change does not exceed 20 占 폚 per hour.

In this way, if the strength is checked on the 7th and 28th days after demoulding and the measurement (test) result is less than the design reference strength on 28th of August, it should be rejected according to the nonconforming product management procedure. However, in case of high strength, it may be regarded as 56 days of age

Tensile disassembly and Demolding

Then, after removing the curing tent 50 of FIG. 4 which confirms the demolding strength of the concrete, the tensile of the tensile member 30 is disassembled. A prestressed concrete is introduced into the cured concrete as a tensile demolition.

The required compressive strength of concrete is 70% or more of the design strength per day, and further curing can be carried out when it is under. This can be confirmed by measuring the strength of the Schmidt hammer. When the tension is dismantled, the tension member is cut by the cutting machine. At this time, the tension member is cut symmetrically so that the eccentricity is not applied.

After disassembly of the tension, the cutting position corresponding to the unit length is confirmed, and then the concrete is cut using a saw machine (not shown). A known concrete cut indicator can be used for the cutting position. The concrete can be cut at both ends after cutting at the center, cutting at the top, cutting at the bottom, and cutting at the end after cutting.

Use a dedicated lifting jig to move the cutter in one direction, move it in one direction only, and bidirectional simultaneous movement is in principle dangerous and prohibited. In addition, it is absolutely forbidden to lift the cutting element over the equipment.

Thereafter, the closed integral hollow slab 100, which is a cutting member, is securely laid on the yard using a supporting frame.

As shown in FIG. 6, the patterned hollow hollow slab 100 thus formed is provided with the pattern 102 on one side by the patterned foam 20 after demoulding, thereby improving the appearance. In addition, according to the present method, since it is manufactured in an automated line system at a factory, the productivity can be improved, the manufacturing cost can be reduced by mass production, and the quality can be maintained uniformly.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: Lower mold for hollow slab installation
16: tension device
20: Pattern Form
30: Tension material
50: Curing tent
60: Tent packing equipment

Claims (4)

A guide rail 14 arranged in the longitudinal direction on the side of the lower mold 10 for hollow slab installation, a lower mold 10 for hollow slab installation A tensioning device (16) arranged on both sides in the longitudinal direction of the mold;
Disposing the pattern 20 in the longitudinal direction on the bed side of the hollow mold 10 for hollow slab placement and then fixing the pattern foam 20 using bolts in the perforated holes of the bed;
Placing a tension member (30) in the hollow mold (10) for pouring the hollow slab and tensioning the tension member (16);
The concrete is poured while moving the slab-dedicated truck-type installer 40 mounted on the guide rail 14 to the lower mold 10, and then the paved section is installed in the tent packing equipment 60 mounted on the guide rail 14 Installing a curing tent (50) using the curing tent (50);
Removing the tent (50) and disassembling the tensile material (30) after completing the curing of the concrete by adjusting the time and temperature;
And a step of demolding the cut concrete after cutting the concrete by confirming the cutting position of the concrete corresponding to the unit length of the concrete slab. The method according to claim 1,
The curing of the concrete,
Raising the temperature to 50 to 60 占 폚 in about 2 to 2.5 hours so that the temperature rise does not exceed 20 占 폚 per hour before entering this curing;
Maintaining a suitable temperature of about 50 to 60 DEG C over about 6 hours with the curing;
And lowering the temperature to 30 占 폚 within 2 hours within a range not exceeding 20 占 폚 per hour after the main curing step. The method according to claim 1,
Wherein the concrete slab is maintained at a temperature of 20 to 25 캜 at a bed of the lower mold (10) immediately before the concrete is inserted. A hollow-walled hollow slab manufactured by the method of any one of claims 1 to 3.

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