JP3602727B2 - Slip form method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slip-forming method suitable for constructing concrete road gutters, protective walls, parapets at bridge ends, circular waterways, and the like.
[0002]
[Prior art]
The slip form method comprises a pair of form panels arranged opposite to each other, a portal frame called a yoke supporting each form panel, and a lifting device such as a hydraulic jack for pulling the yoke upward. The concrete is poured into the space between the formwork panels, and after the concrete has hardened, the formwork panel is pulled up together with the yoke by the operation of the lifting device, and the mold is removed. This is a method of constructing a concrete wall without joints by continuously performing the work of placing concrete in the provided space.
[0003]
[Problems to be solved by the invention]
By the way, when concrete hardens in the formwork panel, an adhesive force is generated between the concrete and the formwork surface of the formwork panel. When performing, scratches and rough skin are likely to occur on the concrete surface due to shear friction generated on the surface of the hardened concrete.
[0004]
As described above, when a scratch or rough skin occurs on the concrete surface, the aesthetic appearance of the structure is impaired, and there is a fear that the scratch may develop into a concrete crack, and there is also a problem in durability of the structure. .
In addition, even when the cement hydration reaction in concrete does not proceed favorably in summer or winter, the surface properties of concrete may be impaired. In other words, if the concrete temperature drops significantly during the severe winter, the hydration reaction of the concrete will be insufficient, and a frictional force will be generated when the form panel is moved, causing the concrete surface to peel off, Expression may be delayed. Also, when the concrete surface dries early due to the heat of hydration of the cement during the hot summer, or when the concrete becomes hot, frictional force is generated when the The surface may be scratched or roughened, or the strength may be poorly expressed.
[0005]
Therefore, it is conceivable to cover the concrete casting position with a large tent, etc., and to make the cement hydration reaction the optimal temperature environment even in the summer or winter, but large-scale preparation is required, There are problems in terms of construction and construction costs.
On the other hand, concrete hardening accelerators are sometimes used to remove the mold panels early and to reduce the lateral pressure of concrete acting on the form panels.However, hardening only on the concrete surface side is promoted. Conventionally, a concrete hardening accelerator is conventionally supplied to the entire area of the concrete to accelerate the hardening of the entire concrete. Therefore, a large amount of the concrete hardening accelerator is required.
[0006]
In the case of concrete using sulfur, when the temperature of the form panel is low, the concrete cools and hardens during the filling of the concrete, and the concrete may not be filled to every corner of the form panel. In addition, when the sulfur concrete is cooled and hardened, the crystal form of the sulfur after hardening differs depending on the cooling rate, including the case where it becomes amorphous, so that concrete that does not exhibit the desired performance is manufactured. In some cases.
[0007]
In addition, sprinkling curing may be performed in the middle of the summer to prevent the concrete surface from drying out early due to the heat generated by hydration of the cement. There was a problem in terms.
The present invention has been made in view of the above circumstances, and as a first object, a surface defect of concrete is suppressed to enable a mold panel to be removed , and as a second object, a casting position is set to a large tent or the like. The cement hydration reaction can proceed favorably even in summer or winter, without the need for preparation such as covering, and the third purpose is to greatly reduce the amount of concrete hardening accelerator and watering for curing. A fourth object of the present invention is to provide a slip-form method capable of producing a sulfur concrete having a predetermined crystal form by filling concrete using sulfur into the details of a formwork.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 has at least a pair of form panels facing each other with form surfaces facing each other, casting concrete between the form surfaces, and the concrete is hardened. Later, in the slip form method in which the form panel is pulled up by a lifting device and moved to the next concrete pouring position, and a seamless concrete wall surface is constructed, the form panel is directed toward the form surface. This is a method of forming a large number of pores that are opened by opening, and injecting air or lubricating oil sent from the fluid supply device into the inside of the mold surface through the pores.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a slip-form method according to a first embodiment for constructing a concrete wall surface. The slip-form method includes a pair of formwork surfaces 2a and 4a of which face each other in parallel. Panels 2 and 4, horizontal yoke members 6 and 8 fixed to rear surfaces 2 b and 4 b opposite to the form surfaces 2 a and 4 a of these form panels 2 and 4, and horizontal yoke members 6 and 8. And a vertical yoke member 10 connected to and extending upward . Here, the two vertical yoke members 10 are connected to a hydraulic jack (not shown), and the form panels 2, 4 move upward together with the vertical yoke member 10 by the operation of the hydraulic jack .
[0013]
As shown in FIG. 2, the form panel 2 of this embodiment is a box-shaped member having an internal space 40, and a plurality of pores 42 communicating with the internal space 40 are formed in the entire area of the form surface 2a. ing. Further, a supply port 44 communicating with the internal space 40 is provided on the back surface 2b, and the compressed air A supplied from the fluid supply device 26 is sent into the internal space 40 through the supply port 44. ing. Although not shown, a control valve for controlling the supply of compressed air A, the pressure, and the like is provided in a supply path between the supply port 44 and the fluid supply device 46. Further, a nonwoven fabric 48 having fine cloth holes is stuck on the entire area of the mold surface 2a. The form panel 4 also has the same configuration as the form panel 2.
[0014]
In order to construct a concrete wall using the apparatus having the above configuration, first, the form panels 2 and 4 are moved to the position indicated by the solid line in FIG. 1 by operating a hydraulic jack. Next, concrete C is poured into the space provided between the mold surfaces 2a and 4a. Then, when the concrete C hardens after a predetermined time, the supply of the compressed air A from the fluid supply device 46 to the internal space 40 is started by operating the control valve, and the form panels 2, 4 are operated by operating the hydraulic jack. A demolding operation of raising the position to the position indicated by the broken line in FIG .
[0015]
At this time, the air ejected from the mold surfaces 2a, 4a through the pores 42 from the internal space 40 becomes an air layer between the mold surfaces 2a, 4a and the surface of the concrete C, and the surface of the concrete C becomes Since the concrete C moves along the air layer, almost no shear friction is generated on the surface of the concrete C, and the number of scratches and rough skin is greatly reduced.
Here, as a second embodiment, there is a method of supplying oil B from the fluid supply device 46. In this embodiment, when the concrete C has hardened, the supply of the oil B from the fluid supply device 46 to the internal space 40 is started by operating the control valve, and the form panels 2 and 4 are moved by operating the hydraulic jack. 6, the oil B squirted from the mold surfaces 2a, 4a through the pores 42 from the internal space 40 is discharged from the internal space 40 to the surface of the concrete C. And the surface of the concrete C moves along the lubricating oil layer, so that almost no shear friction occurs on the surface of the concrete C, and scratches and rough skin are greatly reduced. .
[0016]
Further, as a third embodiment, there is a method of supplying a liquid concrete hardening accelerator L from a fluid supply device 46. In this embodiment, immediately before the concrete C is poured, the supply of the concrete hardening accelerator L from the fluid supply device 46 to the internal space 40 is started by operating the control valve. When the concrete hardening accelerator L flows into the inside of the mold surfaces 2a, 4a, the hardening of the surface side of the concrete C is promoted as compared with the inside of the concrete C.
[0017]
As described above, since the surface side of the concrete C hardens before the inside, it is desired to realize an early demolding operation of the form panels 2, 4 or by casting high-fluid concrete. This is an effective means when it is desired to reduce the lateral pressure of the concrete acting on No. 4.
Further, since the concrete hardening accelerator L is not supplied to the entire area of the concrete C as in the related art, the consumption of the concrete hardening accelerator L is greatly reduced, so that an economical slip forming method can be provided.
[0018]
Further, as a fourth embodiment, there is a method of supplying hot water H from the fluid supply device 46 during a severe cold season. In this embodiment, after the concrete C is cast, the supply of the hot water H from the fluid supply device 46 to the internal space 40 is started by operating the control valve. At this time, the warm water H flowing out of the inner space 40 through the pores 42 and flowing into the inside of the mold surfaces 2a and 4a is heated to a temperature around the concrete C so that the cement hydration reaction proceeds favorably throughout the concrete C. Since the temperature is raised to the optimum environmental temperature, the hydration reaction of the surface of the concrete C is sufficiently performed. Therefore, even when shearing friction occurs between the mold surfaces 2a and 4a when performing the demolding operation, defects such as peeling of the surface of the concrete C can be suppressed. In addition, there is no need for a large tent for covering the concrete casting position, so there is no problem in terms of construction period and construction cost. In addition, an appropriate amount of hot water H is supplied from the form panels 2 and 4 to the concrete C. Therefore, there is no problem in the vicinity of the hot water H (curing water) and in the recovery and reuse of the curing water.
[0019]
As a fifth embodiment, there is a method of supplying cold water W from the fluid supply device 46 in the middle of the summer. In this embodiment, after the concrete C is cast, supply of the cold water W from the fluid supply device 46 to the internal space 40 is started by operating the control valve. At this time, the cold water W flowing from the internal space 40 to the inside of the mold surfaces 2a and 4a through the pores 42 is heated to an ambient temperature such that the cement hydration reaction proceeds well throughout the concrete C. Since the temperature is lowered to the optimum environmental temperature, the hydration reaction of the surface of the concrete C is sufficiently performed. Therefore, even when shearing friction occurs between the mold surfaces 2a and 4a when performing the demolding operation, defects such as peeling of the surface of the concrete C can be suppressed. Further, similarly to the above-described fourth embodiment , there is no problem in terms of construction period and construction cost because a large tent or the like is not required. In addition, contamination around the cold water W (curing water), and recovery and re-curing of the curing water are performed. There is no problem in terms of use.
[0020]
FIGS. 3 and 4 show a sixth embodiment similar to the present invention. In the form panel 2 of the present embodiment, a heating element 52 such as a nichrome wire or a ribbon heater that generates heat when energized with a power supply is disposed on an inner wall 50a that is a back surface of the form surface 2a of the internal space 50. A temperature sensor 54 for detecting the temperature of the mold surface 2a is provided at the center of the inner wall 50a. When the measured temperature detected by the temperature sensor 54 is equal to or lower than a predetermined value, the temperature control unit (not shown) energizes the heating element 52 and stops energizing the heating element 52 when the measured temperature exceeds the predetermined value. . In addition, one form panel 4 has the same configuration.
[0021]
According to the slip-form method including the form panels 2 and 4 having the above-described configuration, immediately before the concrete C is cast, energization of the heating element 52 is started by the operation of the temperature control unit, and the form surface 2a is fixed to a predetermined position. Heat up to reach temperature. Thereby, the poured concrete C is heated from the surface side near the form panel 2 side, and the hydration reaction is promoted, so that high quality concrete C can be formed in a short time.
[0022]
Moreover, even if it is a severe cold season, if the form panels 2 and 4 are not sufficiently heated, the concrete property will not be high quality, and it will be an optimal construction method for sulfur concrete. That is, even if sulfur concrete is poured between the form panels 2 and 4, the sulfur is heated from the surface near the form panel 2 side, and the sulfur is kept in a molten state and is reliably filled. Defects such as voids are suppressed on the surface of the concrete, and sulfur concrete exhibiting desired performance can be produced.
[0023]
FIG. 5 shows a form panel 2 according to a seventh embodiment similar to the present invention, which is formed in a box shape having an internal space 60, and has a fluid supply port on the back surface 2b. 62 and a fluid outlet 64 are provided. Then, cold water or cooled oil is fed from the fluid supply port 62, circulates through the internal space 60, and then flows out from the fluid discharge port 64.
[0024]
When a concrete wall surface is constructed using the apparatus having the above configuration, cold water or cooled oil circulating in the internal space 60 cools the formwork panel 2, and the entire area of the concrete poured in favors the cement hydration reaction. As described above, the ambient temperature is reduced to the optimal environmental temperature, so that the hydration reaction of the concrete surface can be reliably performed.
[0025]
Further, when hot water or heated oil is fed from the fluid supply port 62 and circulated through the internal space 60 and then flows out from the fluid discharge port 64, the mold panels 2, 4 are sufficiently heated even in a severe cold season. Therefore, for example, even if sulfur concrete is poured between the form panels 2 and 4, the hydration reaction is surely promoted by heating from the surface side near the form panel 2 side, and the desired performance was exhibited. Sulfur concrete can be manufactured.
[0026]
【The invention's effect】
As described above, according to the slip form method of claim 1, the air or the lubricating oil sent from the fluid supply device is injected into the inside of the mold surface through a number of pores formed in the mold surface. Since an air layer or a lubricating oil layer is provided between the form surface and the concrete surface, even if the cast panel is pulled up after the poured concrete has hardened, the air layer or the lubricating oil layer can be applied to the concrete surface. Shear friction hardly occurs, and defects on the concrete surface can be suppressed.
[Brief description of the drawings]
FIG. 1 is a view showing an apparatus according to a first embodiment of the present invention by a slip foam method.
FIG. 2 is a diagram showing details of a device according to a first embodiment according to the present invention and a second embodiment to a fifth embodiment similar to the present invention by a slip form method.
FIG. 3 is a view showing a form panel according to a slip foam method according to a sixth embodiment similar to the present invention.
FIG. 4 is a view taken along line XX of FIG. 3;
FIG. 5 is a view showing a form panel according to a slip foam method of a seventh embodiment similar to the present invention.
[Explanation of symbols]
2, 4 Form panel 2a, 4a Form surface 40 Internal space 42 Pores 46 Fluid supply device 52 Heating element (heating means)
A Compressed air B Oil (lubricating oil)
C Concrete L Concrete hardening accelerator H Hot water W Cold water

Claims (1)

At least a pair of form panels are faced to each other, concrete is poured between the form surfaces, and after the concrete has hardened, the form panel is pulled up by a pulling device to raise the next concrete. In the slip form method of moving to the casting position and constructing a seamless concrete wall surface, in the form panel, a large number of pores opening toward the form surface are formed, and from the fluid supply device. slip-form construction method, wherein the delivery air, or of the lubricating oil, is injected into the inside of the mold surface via the pores.

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