JPH09221913A - Curing method of concrete and curing equipment and curing mat used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form the uniform atmosphere of warm air surrounding concrete being cured in the cold season and to keep it in an environment hardly delaying or deteriorating an exothermic reaction of hydration of the concrete or to guide it thereinto at least. SOLUTION: An air-permeable sheet 15 is provided on the inner side of two external sides including a form of a concrete structure 1 after placing and a non-air-permeable sheet 14 on the outer side thereof, and they are covered with a curing mat 12 forming an air passage between them. Moreover, warm air or humidified warm air supplied continuously from the lower end of the curing mat 12 is supplied forcibly from the air-permeable sheet 15 on the inner side of the curing mat 12 in a process of its rising through the air passage. By this constitution, the atmosphere surrounding the concrete structure 1 is kept in an environment hardly delaying or deteriorating an exothermic reaction of hydration of concrete or guided into it at least.

Description

Detailed Description of the Invention

[0001]

SUMMARY OF THE INVENTION The present invention relates to a method and an apparatus for preventing freezing of concrete during curing in the cold and a curing mat therefor, and in particular, it surrounds the outside and supplies warm air or humidified hot air. As a result, at least a novel concrete curing method, which can hold or induce the concrete hydration exothermic reaction in an environment where it is difficult to delay or deteriorate, and a novel curing device and curing mat used therefor are provided. is there.

[0002]

2. Description of the Related Art In the construction of a concrete structure at a severe site where the temperature drops to below freezing, such as in the winter of Tohoku, Hokkaido and mountains, the low temperature causes a delay in the exothermic reaction of hydration of concrete or Curing work to prevent deterioration is one of the extremely important works. So far, under such conditions, it is necessary to keep the temperature of the concrete at 5 degrees Celsius or more and to prevent it from being directly exposed to the wind. After pouring ready-mixed concrete inside, cover the entire pouring concrete with a vinyl sheet to create an atmosphere that secures moisturizing and heat retaining properties, and while blowing warm air with a burner,
A means for humidifying by a humidifier or the like to maintain a heated and humidified state has been generally adopted.

However, in the conventional curing method for supplying humidified warm air by covering a vinyl sheet, when humidified warm air is supplied into the vinyl sheet in the cold, the high temperature air naturally rises and the low temperature air is changed. The phenomenon of accumulation in the lower part is not improved, and when curing a large concrete retaining wall, etc., only the upper part can somehow satisfy the curing condition, but in the lower part there are places where it cannot be satisfied. Accidents tended to occur frequently, making it impossible to obtain design strength. Therefore, it is necessary to specially arrange a blower, fan, etc. to forcibly turn the warm air that is unevenly distributed upward, and to compensate for the decrease in temperature due to the blower, fan, etc. It was necessary to pay close attention to on-site management, such as by adding other measures to ensure that the entire pouring concrete would meet the necessary conditions, such as by significantly increasing equipment costs and fuel costs.

[0006] These restrictions are of course a great burden on the contractor for the construction of a concrete structure whose site is in a cold region, which leads to a serious problem of reducing the economic efficiency of the involved contractor and diminishing the will of production. However, it has been a major obstacle in achieving a safe structure consisting of high-quality concrete strength as designed, and there has been a long-standing need for improvements in these structures. The reality is that such measures have passed without being exaggerated. The inventor of the present application, in such a concrete pouring work in the cold, in a curing atmosphere formed by a curing sheet such as a vinyl sheet covering the entire cast concrete, supplying humidified hot air as uniformly as possible, Focusing on the need to put into practical use a concrete curing method that allows the entire cast concrete to be cured as homogeneously as possible, we started research and development, and after repeated trial and error over a long period of time, repeated numerous experiments, As will be described later, we succeeded in finally developing and realizing a new curing method for concrete that can even uniformly cure large-scale cast concrete, and a new curing device and curing mat used for it. Below,
The configuration of the present invention will be described in detail together with the representative embodiment of the present invention shown in the drawings.

[0005]

As can be clearly understood from the embodiments of the present invention shown in the drawings, the concrete curing method included in the present invention basically comprises the following measures. That is, both outer sides including the formwork of the concrete structure after casting, the inner surface is a breathable sheet, the outer surface side is a non-breathable sheet, the internal space surrounded by both,
After covering with a curing mat formed in a blower path that communicates in a meandering or detoured manner from below to above, hot air or humidified hot air is continuously supplied from a ventilation port provided at the lower end of the curing mat, By allowing these warm air or humidified hot air to be forcibly supplied to the periphery of the concrete structure including the formwork from the breathable sheet on the inner surface of the curing mat in the process of meandering or detouring upward through the air passage.
It is a concrete curing method characterized in that the atmosphere surrounding the concrete structure is maintained or guided at least in an environment in which the exothermic reaction of hydration of concrete is unlikely to be delayed or deteriorated.

The concrete curing method of the present invention having this basic structure also includes a further improved curing method having the following structure. That is, both outer sides including the formwork of the concrete structure after pouring, the inner side is a breathable sheet and the outer side is a non-breathable sheet, and the inner space surrounded by both is meandered from the lower side to the upper side. While covering with a curing mat formed in the air passage that communicates in a circular or detoured manner, the upper end side of the concrete structure is covered with a crown curing mat formed in a structure substantially similar to the previous curing mat. A process in which hot air or humidified hot air is continuously supplied from both the air outlet provided at the lower end of the curing mat and the air outlet of the top curing mat, and these hot air or humidified warm air meanders or detours up through the air passage. Then, the atmosphere surrounding the concrete structure can be at least reduced by forcing supply from the breathable sheet on the inner surface of the curing mat to the periphery of the concrete structure including the formwork. A concrete curing method as would hold or induce cleat hydration exothermic reaction delay or hardly under environment degrade.

The curing mat, together with the mold, needs an area sufficient to completely cover the cast concrete, and is formed of a breathable sheet on the inner surface side and a non-breathable sheet on the outer surface side so that a ventilation path is formed inside. It is made of a superposed structure, and functions to supply hot air or humidified hot air to the inner surface as uniformly as possible, and at the same time, it is of a size and sturdy that is convenient for handling at construction sites. Must be formed and therefore
Desirably, it should be formed in a width that is an integral multiple of the form support material installation interval, by connecting an appropriate number of them, so that it is possible to completely cover the poured concrete including the form of a predetermined width, Like the unit curing mats described later, the ventilation ducts should be connected to each other so that the ventilation ducts are in communication with each other, and a ventilation hose is connected to each unit curing mat so that each unit ventilation mat forms an independent ventilation duct. It is also possible to form it as one that stops. In addition, when the unit curing mat is used, it is necessary to adopt an optimal structure in which the leakage of warm air or humidified warm air from the connecting portion can be minimized or does not leak at all.

The non-breathable sheet constitutes the outside of the above-mentioned curing mat and functions so as to flow out only the inside of the curing mat without allowing the warm air or the humidified warm air from the warm air blower or humidifying warm air blower to pass through as much as possible. ,, for example, a seamless single-layer or laminated structure made of a plastic sheet, which is superior in air impermeability compared to the breathable sheet that constitutes the inside of the curing mat, for example,
The air permeability of the air permeable sheet is relatively increased by the tent that allows some air to pass through, or the sheet structure such as stacking multiple breathable fabrics, resulting in a relative increase in the air permeability of the air permeable sheet. Since the hot air can be blown toward the concrete side, it is possible to meet the minimum requirements for the non-breathable sheet of the present invention.

The breathable sheet is combined with the inside of the non-breathable sheet, and realizes an air blowing path therebetween, and hot air or humidified air forcedly fed from below passes through the air blowing path. In the process of rising in a meandering shape or a detour shape, it must function so that it can be blown out uniformly only to the formwork surface or the exposed pouring concrete surface side, relatively fine mesh body, relatively rough Of the cloth body or a perforated sheet in which small holes such as pinholes are finely formed are formed alone or appropriately laminated and combined, and the non-breathable sheet forms an air passage described later. In this way, stitching (however, it is desirable that the seam be non-breathing processed, for example, a shield coating layer be formed, or a non-breathable sheet be laminated and adhered), or adhered or welded They are integrated with each other in the means.

The air passage is an internal space formed between the non-air-permeable sheet and the air-permeable sheet, and the hot air or humidified hot air forcedly sent is directed upward from below. It is formed so as to be supplied in a meandering or detouring manner, and a path is ensured so that warm air or humidified hot air can be distributed over the entire inner surface of the curing mat as evenly as possible. Desirably, the supplied humidified warm air is first circulated at the outer edge portion where the thermal loss is large, and is configured to have a spiral shape so as to gradually flow toward the center side, or
If the zigzag shape is formed in the vertical, horizontal, or diagonal directions, it can be more effective in realizing the uniform supply of humidified warm air over the entire surface of the mat.

[0011]

[Related invention 1] In relation to the concrete curing method described above, the present invention also includes a concrete curing apparatus used in the curing method, and the gist of the configuration is basically as follows. is there. A curing mat whose inner surface is formed by a breathable sheet and whose outer surface is formed by a non-breathable sheet is formed to have a predetermined height and unit width, and an air passage that connects the internal space from below to above in a meandering or detoured manner. And the curing mats are connected to each other by air-blowing connection ports that also function as air-blowing ports formed at both ends of the lower end air-blowing path, and the entire air-blowing paths are in a lateral communication state, and a concrete structure to be cured is provided. A curing mat capable of collectively covering a predetermined outside area including a formwork of the object, and any ventilation connection port in the curing mat, preferably in the middle or at a position where the overall arrangement is well balanced. A concrete curing device for use in the above concrete curing method, wherein a blower hose from a warm air fan or a humidifying warm air fan can be connected using the connection port as a blower port.

The curing mat is formed with a breathable sheet on the inner surface side and a non-breathable sheet on the outer surface side, and has a predetermined height and a unit width having a ventilation path connected in a meandering or detouring manner from below to above. Not only is it formed on the both sides, but also on the lower end sides of the air passage, it must be formed on a curing mat formed with a ventilation connection port that also serves as a ventilation port. It is formed so that the air blow paths can be connected to each other by being connected by the air blow connecting ports facing each other. The connection structure of the blower connection port is not limited to a special one such as that described later, and for example, a sleeve-shaped blower connection port is provided with a connection pipe as a connecting body interposed therebetween. Appropriate connection means can be adopted, such as means for tightly integrating the respective ventilation connection ports with the connection pipe by means of belts, rubber cords, or fixing band fittings.

On the other hand, the warm air or the humidified hot air is supplied from a conventional warm air machine, for example, a spot heater (a hot gun or the like under the trade name) using kerosene as a fuel, which is used in various work sites, either alone or in the middle. It is sufficient if the forced air blower is combined to increase the hot air supply efficiency, or the humidifier is combined to supply the humidified hot air, but the present invention includes handleability, thermal efficiency, humidification efficiency, and the like. Of course, it is also possible to use a specially designed warm air blower or humidification warm air blower to optimize the curing method.Optimum structure and performance that meet the harsh conditions of adoption and installation at the work site. It is desirable that the ones adopted are adopted. And, in addition to its performance, this warm air blower or humidifying hot air blower is appropriately adopted one or several depending on the size of the range to be cured. In terms of its efficiency, the most centrally located ventilation connection is used as an exhaust outlet, and in the case where several machines are installed side by side, the ventilation connection at a position that provides a well-balanced overall ventilation is provided. Connect as if it were a mouth.

[0014]

[Related Invention 2] Further, the present invention relates to a method for curing concrete constituting a skeleton of the present invention and the concrete curing apparatus described above. The present invention is as follows, which are required in the curing method and the curing apparatus. A curing mat having a structure is also included as a related invention. That is, the outer size is regulated so as to have a predetermined height and a unit width, the inner surface is formed of a breathable sheet, and the outer surface is formed of a non-permeable sheet, and the inner space is formed in a meandering shape from below to above. Alternatively, a blast passage communicating with a detour is formed, and the end of the blast passage located at the lower end is also formed as a blast connection port that also serves as a blast port and has a cap or other closing means capable of closing itself. The existing unit mat is used as a mat.

The air passage of this unit curing mat is discontinuous in the lateral direction at every height position where the inner surface side made of a breathable sheet and the outer surface side made of a non-breathable sheet are spaced at predetermined intervals in the height direction. In order to form a zigzag arrangement in which the upper and lower parts do not overlap with each other, for example, by directly stitching or by gluing or welding, connecting bands are sewn between them or by gluing or welding. It is most convenient to realize a meandering or detour-like structure that leads from the lower side to the upper side by forming the partition wall by integrating it as a bulkhead, and making the parts not blocked by these partition walls into the communication shape. It can be an air duct.

On the other hand, in the curing mat composed of this unit curing mat, as will be concretely disclosed in the examples described later, the ventilation connection port thereof is a tube made of a breathable sheet on the inner surface side and a non-breathable sheet on the outer surface side. It is formed by combining a bag part and a connecting frame made of elastic material with a two-fold structure that can be restored to an annular shape that is inserted into the tubular bag part, and the connecting frame of one ventilation connection port is restored to an annular shape. After that, by inserting the connecting frame of the other curing mat to be connected while folding it in half, expanding it and restoring it to an annular shape, this connecting frame is located inside the previous connecting frame and it is prevented from coming out. , The mutual connection can be easily realized, or an eyelet metal fitting is provided on the upper end side, and if necessary, a hanging allowance with an exhaust port is formed over the entire upper end side width. Formed, If the curing mat has a structure that makes it easy to hang it on the exposed rebar above the formwork, and if it can also serve as a cover between the upper ends of the formwork, this curing mat The structure can be made more practical. Hereinafter, some embodiments shown in the drawings will be described in detail so that the concrete curing method and the configuration of the concrete curing apparatus included in the present invention can be grasped more specifically and clearly. I will.

[0017]

[Embodiment 1] First, with reference to the perspective view showing the usage state of the concrete curing apparatus of FIG. 1, the side sectional view showing the usage state of the concrete curing apparatus of FIG. 2, and the front view of the curing mat to be put on the concrete of FIG. The most typical construction of the concrete curing apparatus of the present invention will be described. The concrete structure which is a target in this embodiment relates to a retaining wall constructed in cutting or embankment, and the concrete wall body newly placed on the concrete base 2 previously placed. This is an example of curing 1.

In the concrete wall 1, the grid-reinforced rebars 3, 3, ... Are laid inside, and the outside is supported by vertical flaps and horizontal flaps. It is a concrete structure formed by placing concrete between weir plates 4 and 5 which are vertically arranged at intervals. The weir plates 4 and 5 that support and regulate both sides of the concrete wall body 1 are supported by a form material made of vertical flap material and horizontal flap material combined in a form tie, and at the outside of one barrier plate 5. As shown in the figure, a pipe support (supporting material) 6, in which formwork materials composed of vertical flap material and horizontal flap material combined by form ties are obliquely installed at predetermined intervals in the horizontal direction,
6, ... support these pipe supports 6, 6, ...
The upholstery material 7 made of an iron chain or the like in which the turnbuckle 8 is incorporated on the root side is juxtaposed in each of the ..., and each of the turnbuckles 8 is operated to project onto the upper surface of the concrete base 2. The tension is applied to each of the upholstery members 7, 7, ... by using the connecting hooks 9, 9, ... as a supporting portion, and the pipe supports 6, 6, ... also function as compression members,
The entire formwork structure including the weir plates 4 and 5 is properly held in an upright state. Further, on both sides of the concrete wall body 1, steel pipe scaffolds 10 are installed at positions close to each other so that a work space is appropriately secured from the form material, and work floors 11 are provided in upper and lower two stages to perform various works. Is made safe.

The curing mat 12 is formed into a unit curing mat 13 having a size and shape as shown in the front view of FIG. 3 as one unit. The unit curing mats 13, 13, By connecting a predetermined number of ... Horizontally, the width of the concrete wall body 1 to be cured can be dealt with at any time. The unit curing mat 13 is made of a sheet or the like having an outer surface side made of a synthetic resin sheet such as a vinyl sheet, and a sheet made of breathable cloth and synthetic resin or natural rubber laminated and integrated to provide waterproofness and airtightness. Non-breathable sheet 14
In addition, the inner surface side facing the concrete wall 1 is composed of a breathable cloth sheet made of a chemical fiber, a breathable woven cloth made of a natural material such as a non-woven fabric or a cotton cloth, or the like. Thus, the space between them is doubled to form an internal space to form an air flow path, and the warm air or humidified hot air flowing into the air flow path is surrounded by the non-permeable sheet 14 without being discharged to the outside. It is configured to be kept warm and flow out to the concrete wall 1 side exclusively by the breathable sheet 15.

As an example of a specific size of the unit curing mat 13, for example, the full width a is the pipe support 6,
6, ... 5400 mm for three diagonal intervals, and the total height b is set to 4000 mm, which is slightly larger than the casting height for one concrete run. A lowering margin 16 is formed, and coupling margins 17, 18 having a width dimension c are formed on the left and right edge portions. The hanging margin 16 and the coupling margins 17 and 18 are both formed by the non-breathable sheet 14 and have a structure capable of maintaining airtightness. The height d of the hanging allowance 16 is about 700 mm in consideration of the thickness of the concrete wall body 1 and the length of the exposed reinforcing bar, and is set along the left and right edge portions and the upper edge portion. Eyelet metal fittings 1 at predetermined intervals
, 19, ... are attached to these eyelet fittings 19,
Units of matting mat 13, 13, ... are connected to the reinforcing bars 3, 3, ... exposed from the concrete wall 1 through the binding strings such as the smoothed iron wires 19, ... It is held suspended along the wall.

Further, a predetermined interval is provided in the middle of the hanging margin 16 in the width direction, for example, pipe supports 6, 6, ...
A plurality of vertically slit slit-shaped exhaust ports 20, 20 are formed at intervals of 1800 cm, which is an oblique interval, and eyelet fittings 19, 1 are also provided at the edges of the vertically slit slit-shaped portions.
.. are provided so that the opening of the exhaust ports 20 and 20 can be adjusted or can be hung on another object by passing a binding cord. Furthermore, eyelet fittings 19 and 1 are also provided at predetermined intervals on the respective edge portions of the left and right connection margins 17 and 18 formed continuously with the hanging margin 16.
, ... are arranged over the entire height, and the binding margins of the adjacent unit curing mats 13, 13 are also spliced together by inserting a tie string, etc. The unit curing mats 13 are connected in the lateral direction.

On the other hand, at the bottom of the unit curing mat 13,
As shown in the lower part of FIG. 2, a bag-shaped lower-stage air passage 21 having a diameter e of about 300 mm over the entire width is formed by wrapping around the non-air-permeable sheet 14 to the lower side. By providing the wrap-around portion 22 of the breathable sheet 14, it is structured to prevent the blown warm air or humidified warm air from flowing out from the lower side to the outer side. Further, a plurality of tongue pieces 23, 23, ... Are sewn along the mat width direction at the lower part of the lower air passage 21, and eyelet metal fittings are also provided on these tongue pieces 23, 23 ,. By providing the tightening cords that are provided and connecting these tightening cords to the steel pipe, it is possible to prevent the lower edge of the unit curing mat 13 from rising due to wind pressure.

The lower stage air passage 21 has both end portions exceeding the connection margins 17 and 18, and as shown by a dimension f in the figure, about 220
It is formed so as to be extended by about mm, and each of the ends is provided with blower connection ports 25 and 26 (detailed structure will be described later), and the upper surface side has a predetermined dimension g along the mat width direction. The non-breathable sheet 14 and the breathable sheet 15 are united at every time (for example, every 850 mm) by being sewn (or adhered, welded, etc.), and a plurality of joints that are not sewn (for example, a stitched portion and The width dimension h between the seam and the stitched portion is 150 mm) and is formed in the communicating portions 27, 27, ...
That is, hot air or humidified hot air is provided above the mat width across the communicating portions 27, 27, ... arranged in a dotted pattern without communicating with the entire upper wall of the lower air passage 21. It is designed to create uniform blowing conditions across the width.

The lower air passage 2 of the unit curing mat 13
In the inner space connected to the upper side of 1, the non-breathable sheet 14 and the breathable sheet 15 at predetermined width-direction dimensions k, k, ... Part are sewn (or bonded, welded, etc.) to about 6
... is formed in the partition wall portions 29, 29, ... having a length of about 00 mm, and the predetermined dimension m, m, ... (about 400 mm) is a non-sewn portion between the stitched portions 29, 29 ,. The upper and lower communicating airflow parts 30, 30, ... Are adjacent to the upper and lower airflow parts 30, 30 ,.
The mutual parts are arranged in positions that are staggered with respect to each other in the width direction, and the warm air or humidification temperature sent upward from the communication parts 27, 27, ... of the lower air passage 21. The wind does not rise at once, and the warm air or humidified hot air that has flowed out of the lower air flow section 30 is always blown against the partition wall portion 29 immediately above, and once it is prevented from rising, it flows laterally before the next wind. It is formed in a blower passage having a structure in which the flow reaches the running portion 30 and rises, that is, the inner hollow portion of the unit curing mat 13 is blown in a meandering or detouring manner.

The air passages (upper and lower partition walls 29, 29, ..., 29, 29, ...) Formed above the lower air passage 21.
The hollow portion 28 formed by pressing the upper and lower sides with a diameter j when the hot air is sufficiently blown into the inside thereof to swell.
However, for example, the warm air or humidified warm air that has been formed to have a size of about 300 mm and has flowed through the partition wall 29 toward the connection margin 17 has a dimension n of about 200 mm at the left and right ends. The air-flowing portion 30 communicates vertically and is blocked by a partition wall portion 29 of about 300 mm formed immediately above the air-driving portion 30 to meander or detour upward. The air passages between the adjacent unit curing mats 13 and 13 are provided. Is the lower air duct 21,2
Other than 1 is formed in a structure that is not connected to each other.

At both ends of the lower blast passage 21, the blast connection ports 25 and 26 in the part surrounded by the chain line circle A in FIG. 3 are enlarged side views of the main parts of FIG. 4 for explaining the structure. 8 is a front view of the same, FIG. 6 is a side view showing the connected state of the adjacent air blowing connection ports 25 and 26, an enlarged cross-sectional view showing the details of the connecting structure of the air blowing connection ports 25 and 26 of FIG. As shown in the front view of 31, an opening degree control valve 32 shown in FIG. 5 is provided at a position slightly inside the opening. The opening control valve 32 includes a disc-shaped valve frame body 33 and a valve plate body 34 rotatably attached to the center of the valve frame body 33. , 180
Two fan-shaped air outlets 35 are opened for each degree, and the valve plate body 34 adapted to this also has a substantially butterfly shape in which a pair of fan-shaped plates also arranged at a position of 180 degrees are connected at a central point. By being formed and rotationally adjusted in the circumferential direction, the blower opening 35 can be opened and closed and the opening thereof can be adjusted.
In addition, an operation knob 36 is pivotally attached to an end portion of the valve plate body 34 exposed to the outside in the radial direction.
The end of 5 can be rotated from the desired outside.

As shown in FIG. 8, a ring-shaped tubular bag portion 39 formed by folding back and stitching the opening edge portion of the air blowing connection port 25 is formed at the outer end of the air blowing connection port 25, and the tubular bag portion is formed. Three
Notches 37 and 38 are formed from the outside of the position where the circumference is divided into two with an angle of 180 degrees inside the notch 37.
A connecting frame 31 that is a ring having a rectangular cross section in the circumferential direction that can be folded from a portion and is made of rubber or the like having appropriate rigidity is inserted and combined in a structure that does not easily fall off. The connecting frame 31 is attached to the other end of the air blowing connection port 26 by the same structure, and connects the adjacent unit curing mats 13 as shown by a chain line circle B in FIG. In doing so, as shown in FIG. 6 and FIG. 7 showing an enlarged cross section of a portion indicated by a circle C in FIG. 6, both connecting frames 31 are set as shown in FIG.
Distort and insert the other connecting frame 31 into one connecting frame 31,
After that, the connection frames 31 are restored to have a circular shape, and the blower connection ports 25 and 26 are pulled in the pulling-out direction, so that a tightly connected connection structure is realized.

At this time, the two connecting frames 31, 31
Are arranged so that the positions of the notches 37 and 38 are shifted in the circumferential direction so that the positions of the notches 37 and 38 do not coincide with each other, and the deformations are prevented from each other, whereby the connecting frame 31 is restored to a circular shape having the same diameter. After that, they are connected to a slip-off preventing structure in which they cannot be detached from each other. Further, as shown in FIG. 6, tongue pieces 23, ... Having eyelet fittings 19 are sewn on the front and back sides on the outer peripheral surfaces of the blower connection ports 25, 26, respectively, and are shown by broken lines in the figure. The attachment eyelets 23 on the back side are tightened with a binding string (not shown) to reinforce the connection with each other.

A unit curing mat 1 constructed as described above
3, the number of sheets corresponding to the curing width is laterally connected, and as shown in FIG. 1, the blower connection ports 25 and 26 in the substantially central portion of the curing width are also used as the blower openings of the blower hose 40. One end side is connected, and the other end is connected to the humidifying warm air blower 41. The humidifying warm air blower 41 is provided with a banner for generating hot air from a fuel (not shown) in the main body, and further includes a water feed pump 43 for drawing water from the water tank 42, and is humidified by water supplied by the water feed pump 43. It is designed to blow hot air.For example, it is possible to use an indirect hot air heater that is often used for temperature control of construction sites, agricultural greenhouses, etc. Is transmitted to the air through a radiator to separate and exhaust the combustion gas, and only the humidified warm air is supplied to the blower hose 40.

As shown in the front view of FIG. 9 and the bottom view of FIG. 10, the connecting structure of the blower hose 40 to the unit curing mat 13 is formed in the central pipe end portion 45 of the T-shaped three-way pipe 44. While being connected to one end of the blower hose 40, both ends of the pipe orthogonal to the central pipe are connected so that the blower connection ports 25 and 26 of the unit curing mat 13 are also used as the blower ports therefor. Blower connection port 2 of this curing mat 13
Left and right tube ends 46 of the trifurcated tube 44 connected to
Similarly to the blower connection ports 25 and 26 described above with reference to FIGS. 6 to 8, 47 is formed in a structure in which the connecting frame 31 is sewn on the edge portion, and the blower connection ports 25 and 26 are connected to each other. In the same manner as above, it is connected to the blower connection ports 25 and 26 which also serve as blower ports.

Further, as shown by a broken line in FIG. 9, a tongue piece 23 having eyelet fittings 19 is provided on the outer wall surface on the back surface side of the blower connection ports 25 and 26 to which the three-way pipe 44 is connected. And insert a tie string into the eyelet metal fitting 19 tongue piece 2
By connecting 3 and 23, it is configured to further increase the connection strength. It should be noted that the blower connection ports 25 and 26 that also serve as the blower ports are provided on the inner side of each of FIG.
The opening degree control valve 32 shown in is naturally provided. Furthermore,
In order to perform accurate temperature control, the temperature sensors T are installed at a plurality of places such as the upper side and the lower side of the concrete wall body 1 so that the accurate temperature can be obtained even when the outside air temperature is changed. I manage it.

On the other hand, as shown in the plan view of FIG. 11, a small curing mat 49 is attached to the upper end portion of the concrete wall body 1 so as to be housed between the reinforcing bars 3 protruding above the concrete wall body 1. The concrete mat 1 is configured to be surrounded by the top end curing mat 49 and the curing mat 12. This top end curing mat 49
Is in the thickness direction of the concrete wall 1 (about 12 in the embodiment).
00 mm), and the width a in the width direction is the same as that of the unit curing mat 13 so that it can be easily combined with the unit curing mat 13.
For example, it is formed on the unit top end curing mat 50 formed to have a length of 5400 mm, and is connected and used laterally in the same manner as the above unit curing mat 13 according to the curing width.

The unit top-end curing mat 50 has a non-breathable sheet 14 on the outer side and a breathable sheet 15 on the side corresponding to the concrete wall 1, and a plurality of lower stage air blowers in the width dimension direction indicated by dimension r. The path 21 and the air paths 28, 28, ...
.., which is basically the same as the unit curing mat 13. Further, the ventilation connection port 25 of the top end curing mat 49 having the same structure as that of the above curing mat 12,
26, the blower hose 4 extended from the humidifying warm air blower 41
0 is connected, and not only the side surface covered with the curing mat 12 described above but also the top end side of the concrete wall 1 is uniformly supplied with warm air or humidified hot air.
Since the dimensions of each part of the top end unit curing mat 50 shown in FIG. 11 are basically unified with the dimensions of each part of the unit curing mat 13 shown in FIG. 3, the same reference numerals are given to the same dimension parts. doing.

The unit curing mat 13 and the unit crown curing mat 50 are used for storing and transporting the individual curing mats 13, as shown in the perspective view of the folding process of the unit curing mat 13 in FIG. 28, ... and lower air duct 2
1 squeeze and fold up and down, and all air ducts 2
8, 28, ... and the lower stage air duct 21 are formed into a lap-belt shape, and are further folded into three zigzag shapes by dividing the total length into three, so that the entire structure can be handled compactly without being bulky. It is formed so that

[0035]

[Embodiment 2] A front view of a curing mat shown in FIG. 13, a front view showing a connection structure of a blower hose shown in FIG. 14, a front view of a main part showing a connection structure of a blower hose shown in FIG. 15, a connection of a blower hose shown in FIG. The embodiment shown in the side view of the main part showing the structure is
In another embodiment, which is characterized by the connection structure of the blower hose 54 to the unit curing mat 53 that constitutes a part of the curing mat 52 of the concrete curing device 51, and the formation of the air flow portions 61, 61, ... is there. Since the unit curing mat 53 has the same configuration as that of the above-described first embodiment, only different parts will be described.

The unit curing mat 53 has a hanging allowance 55, 56 (height dimension s of about 20) at the full width of the upper and lower edges thereof.
0 mm) is provided, and the overall width dimension is 5400 mm, which is equivalent to three diagonal intervals of the pipe supports 6, 6, ...
The dimension t between 6 is 3600 mm, and a plurality of partition portions 60, 60, ... Are formed vertically above and below this portion and are not continuous in the lateral direction.

The partition walls 60, 60, ... Are all dimension x except the dimension z (about 950 mm) on both sides.
Is about 1900 mm, and is formed in a staggered arrangement so that it does not overlap vertically, and is divided by the partition walls 60, 60, ... The diameter u when sent to
mm) 59, 59, ..., and between the partition wall portions 60, 60, ... of each row, there are vertically running air flow portions (dimension y is about 600 mm) 61, 61 ,. .. are ensured, and as a result, as in the first embodiment, the wind-driven portions 61, 61, ... Are all formed on the unit curing mat 51 having a zigzag arrangement.

On the other hand, blower branch pipes 63, 64 projecting across the hanging allowance 56 are formed at the lowermost laterally balanced position of the unit curing mat 53, and the blower branch pipe 63 is formed. , 64 are connected at their lower ends along the lower edge of the unit curing mat 53 to the unit blower hose 54 having the same length as the width dimension of the unit curing mat 53 integrally or by an appropriately detachable means. The unit curing mat 53 in this embodiment is handled as a set structure having a unit blow hose 54 integrally or separately connected therebelow.

Therefore, when the unit curing mats 53 are horizontally connected according to the curing width, these unit curing mats 53, 53, ... Each unit blow hose 54, 54, ...
... The blower connection ports must be sequentially connected to each other so that they are combined into a single blower hose, and finally either one of the blower connection ports or the above-mentioned blower connection port As in the first embodiment, the trifurcated pipe 44 is interposed between the blower connection ports located at the substantially central portion, and the blower hose from the humidifying and warming air blower (not shown) is connected. It is something to do.

The unit blower hoses 54, 54, ... Each unit blower hose 54, 5 for enabling mutual connection.
4, ... The structure of the blower connection port of the connecting portion, which is formed at both ends and is shown by a chain line circle D in FIG. 13, is an enlarged side view of FIG. 14 (a view in which a circular cross section appears) and a chain line circle E in FIG. 15 is an enlarged side view of an essential part of FIG. 15 and an enlarged front view of an essential part of FIG. 16 shows, for example, a circular flange 65 made of metal,
66 are integrally attached to both ends of the unit blower hose 54 by stitching or adhering, etc., and one circular flange 65 therein is provided with two flanges 65, 66 at intervals of 90 degrees in the circumferential direction. U sandwiched in a concentric manner
And a locking claw 67, 67 having a V-shaped cross section, the base end of which is pivotally attached to the flange 65 and which is rotatable in the centrifugal direction of the flange 65. To do. Then, the flanges 65, 66 between the unit blower hoses 54, 54, ... Are connected to each other by rotating and engaging / disengaging the locking claws 67, 67. An operating piece 68 extended to the outside of the flange 65 is integrally formed at the tip of the locking claws 67, ..., With the structure that a fingertip can be easily attached to the operating piece 68.

[0041]

[Working] The concrete curing method and the curing device and the unit curing mat used in the concrete curing method of the present invention having the above-mentioned structure are as shown in FIGS. The curing mat 12 according to the width of 1 is constituted by connecting a plurality of unit curing mats 13 or 51 in the width direction, and the connected unit curing mats 13, 13, ...
, Or 51, 51, ..., like the first embodiment, the lower air duct 2 integrally incorporated in the lower part of the mat.
In the first embodiment, and in the case of the second embodiment, the warm air from the humidifying warm air fan or the humidifying warm air is forcedly fed through the unit blowing hose 54 set below the mat.

The warm air or humidified warm air sent to the unit curing mats 13, 13, ..., 51, 51, ... has the non-breathable sheet 14 on the outside and the breathable sheet 15 on the inside, and the space between them. In the process of ascending through the air duct formed in the hollow portion, the partition walls 2 in which the air ducts are arranged in a staggered pattern
It is blocked by 9 or 60 and flows in the lateral direction,
After reaching 30, ..., or 61, 61, ..., the course of rising to the upper air passage 28 or 53 is followed, and the flow becomes meandering or detouring, and the unit curing mat is formed. 13, 13, ..., or 51, 51,
The time for passing through the inside becomes long, during which warm air or humidified hot air is discharged from the breathable sheet 15 to the concrete wall 1 side on average, and as shown by the arrow in FIG. The entire curing width of the concrete wall 1 can be continuously maintained in a substantially uniform heating state over the entire upper and lower surfaces.

Further, when starting this curing method, in the case where the opening adjusting valves 32 are incorporated in the blower connection ports 25 and 26, the blowing hose 40 is closed after all the opening adjusting valves 32 are closed. After opening only the opening degree control valve 32 of the portion connected to, the humidifying warm air blower 41 is activated to start supplying the humidifying warm air. As a result, the humidified warm air is supplied only to the unit curing mat 13 with the opening control valve 32 opened to start expansion, and the warm air is sequentially pressure-fed through the air-breathing unit 30, and eventually the unit curing mat 13 is expanded. Is in a completely expanded state. Subsequently, the opening / closing control valve 32 of the unit curing mat 13 connected adjacent to the unit curing mat 13 which has completed the expansion is opened, and together with the unit curing mat 13 or 51, the unit curing mat 13 or 5 is opened.
Opening and closing control valve 32 such that 1 also expands
By sequentially starting the air blowing from the unit curing mat 13 close to the humidifying and warming air blower 41, the whole is expanded to enable uniform air blowing. Needless to say, the opening control valve 32 functions to adjust the air volume of warm air or humidified warm air to realize an optimum curing atmosphere.

[0044]

[Effects] As described above, according to the concrete curing method of the present invention, and the curing device and the curing mat used therein, above all, the convection of the humidified warm air that has flowed into the curing mat is prevented to prevent the formwork. Maintaining a uniform curing atmosphere for the entire concrete structure including, and minimizing the temperature difference between the entire surface of the concrete structure to be cured, especially the upper and lower sides, to eliminate unevenness in heat retention as much as possible and delay the hydration exothermic reaction of concrete or Since it can be maintained or guided in an environment that is unlikely to deteriorate, unlike the conventional one, the temperature below the concrete structure cured in the cold does not rise and stable concrete strength can be obtained. Not possible, or too much emphasis on the lower temperature, the upper temperature rises too much (30 ° C) and tends to overdry, resulting in a safe concrete It must be noted that the excellent effect of being able to wipe out the harmful effects even if the strength of the tongue cannot be obtained is obtained.

Further, the curing mat can flexibly cope with the size of concrete, and since the non-breathable sheet and the breathable sheet can temporarily contain the heated hot air, Compared with the conventional structure that used a single vinyl sheet, the heat insulation effect can be significantly increased, and it is possible to perform concrete curing with good heat efficiency.In addition, this curing mat is connected to the unit curing mat, The one that is realized by the combination can correspond to the curing scale at any time, eliminating the uneconomical need to prepare many types of curing mats according to the scale, and the workability of the curing work. It also has the features of being improved and being extremely advantageous in terms of handling such as storage and loading.

On the other hand, in the case where the lower end of the unit curing mat is formed with a connection port provided with a cap or other closing means which can be closed by itself, when a plurality of unit curing mats are connected, the connection port is opened and no connection is required. In this case, the closed use can be selected at any time, and in particular, like the unit curing mats 12 and 51 shown in each embodiment, the meandering or detouring air passages are arranged in a staggered pattern above and below. The partition wall 2 in which the breathable sheet 15 and the non-breathable sheet 14 are integrally formed
Those formed by 9, 29, ... Or 60, 60, .. may have an advantage that they are easy to manufacture and can be provided at a lower cost.

Further, as shown in the first embodiment, at the air blowing connection ports 25 and 26 of the unit curing mat 12, a ring recoverable ring 2 is provided.
In the case where the connection frame 31 having a folding structure is adopted, normally, it is folded in two for easy storage, and when used, the bent portions of the connection frames 31 are displaced from each other so that they can be assembled together and restored to an annular shape for tight packing. It is very convenient that various connections can be realized, and the ventilation connection port 2
Incorporating the opening degree control valve 32 into 5, 26 is extremely effective in uniformly averaging the supply of warm air or humidified warm air when curing a large-scale curing range with the unit curing mat 12. In addition to the feature that the curing method according to the present invention that can surely and uniformly exert the curing opening can be performed very easily, and the entire width of the upper end side of the unit curing mat 12 is achieved. In which the eyelet fittings 19, 19, ... are arranged over the above and the hanging allowance 16 is provided if necessary, not only is it easy to attach to the concrete wall 1, but also A curing mat that is extremely convenient for maintaining the entire concrete structure in a favorable curing atmosphere can be provided.

As described above, the concrete curing method of the present invention, and the curing device and the unit curing mat used for the concrete curing method are, of course, higher in curing effect as compared with the conventional curing methods. It has excellent workability, handling and management such as storage and delivery as materials, and economic benefits associated with ease of manufacturing. It became indispensable for construction work of concrete structures in the severe natural environment like the winter season in Tohoku and Hokkaido,
It is clear that it will be used more and more in the future, and it will bring many benefits, and it is extremely highly evaluated not only by the construction industry, which concentrates on concrete curing in the cold, but also by the general public who wants to construct safe concrete structures. Expected to be done.

[Brief description of drawings]

The drawings show some typical examples embodying the technical idea of the concrete curing method of the present invention, and the curing device and unit curing mat used therein.

FIG. 1 is a perspective view showing a usage state of a concrete curing apparatus of the present invention.

FIG. 2 is an enlarged side sectional view in which a part of concrete curing is omitted.

FIG. 3 is a front view showing the structure of a curing mat.

FIG. 4 is an enlarged front view of an essential part showing a blower connecting portion of a lower stage air duct of a unit curing mat.

FIG. 5 is a side view of the opening control valve (a side on which a circular cross section appears).

FIG. 6 is an enlarged front view of an essential part showing the connection structure of the blower connection parts.

FIG. 7 is an enlarged perspective view of an essential part including a partial cross-section showing the connection structure of the blower connection parts.

FIG. 8 is a side view showing only the connecting frame.

FIG. 9 is an enlarged front view of an essential part showing the connection structure between the blower connecting parts with a trifurcated tube interposed therebetween.

FIG. 10 is a bottom view of the main part of the same.

FIG. 11 is a front view of the crown curing mat.

FIG. 12 is a perspective view showing a folding structure of a unit curing mat.

FIG. 13 is a front view of a curing mat mainly including a unit curing mat according to another embodiment.

FIG. 14 is a side view of a circular flange incorporated in a blower connection port of a blower hose shown by a chain line circle D in FIG.

FIG. 15 is an enlarged side view of an essential part of a portion indicated by a chain line circle E in FIG.

FIG. 16 is a plan view of an essential part of the same.

[Explanation of symbols]

 1 Concrete Walls 4, 5 Weir Plates 12 Curing Mats 13 Unit Curing Mats 14 Non-breathable Sheets 15 Breathable Sheets 21 Lower Air Blowers 25, 26 Blower Connection Ports that also serve as Air Blowers 28 Air Blowers 31 Connection Frames 40 Blowers Hose 41 Humidification warm air blower 49 Top end curing mat 51 Unit curing mat 54 Unit Blower hose

Claims (8)

[Claims] 1. An outer space including a formwork of a concrete structure after placing, an inner surface is a breathable sheet, and an outer surface is a non-breathable sheet, and an inner space surrounded by the both is arranged from the lower side to the upper side. After covering with a curing mat formed in a ventilation path communicating in a meandering or detouring direction, hot air or humidified warm air is continuously supplied from a ventilation port provided at the lower end of the curing mat, and these warm air or The humidified warm air is forced to be supplied from the breathable sheet on the inner surface of the curing mat to the periphery of the concrete structure including the formwork in the process of meandering or detouring upward through the air passage, so that the concrete structure is A concrete curing method, characterized in that the surrounding atmosphere is maintained or guided at least in an environment in which the exothermic reaction of concrete hydration is not delayed or deteriorated. 2. An inner space surrounded by both of the outer sides including the formwork of the concrete structure after pouring is a breathable sheet on the inner surface side and a non-breathable sheet on the outer surface side from the lower side to the upper side. Covered with a curing mat formed in the air passage that connects in a meandering or detouring direction, and the top edge of the concrete structure was covered with a top curing mat formed in a structure similar to the previous curing mat. The hot air or the humidified hot air is continuously supplied from both the air outlet provided at the lower end of the curing mat and the air outlet of the top curing mat, and these hot air or humidified hot air meanders or detours through the air passage. The atmosphere surrounding the concrete structure is reduced by forcing the air-permeable sheet on the inner surface of the curing mat to supply it around the concrete structure including the formwork during the ascending process. A concrete curing method characterized by holding or inducing a concrete hydration exothermic reaction in an environment where it is difficult to delay or deteriorate. 3. An air-permeable sheet on the inner surface side and a non-air-permeable sheet on the outer surface side, and an inner space surrounded by the both is formed in a blower path that communicates in a meandering or detouring manner from below to above, A curing mat consisting of a predetermined height and a unit width or a curing mat and a top curing mat, wherein the curing mat or the curing mat and the top curing mat are
Concrete structures to be cured by connecting at least the respective lower ends or both end air passages formed by the air outlet connection ports that also serve as air outlets so that the entire air passages are in communication in the lateral direction. A curing mat or a curing mat and a crown curing mat capable of collectively covering a predetermined range outside thereof, and any ventilation connection port of the curing mat or the curing mat and the crown curing mat, preferably approximately the center or Concrete used for the concrete curing method according to claim 1 or 2, wherein the blower connection port at a position that provides a well-balanced arrangement as a whole is connected to a blower hose from a warm air fan or a humidifying warm air blower. Curing device. 4. An air-permeable sheet is provided on the inner surface side and a non-air-permeable sheet is provided on the outer surface side, and an inner space surrounded by the both is formed into a blower path communicating from the lower side to the upper side in a meandering or detouring manner. At the same time, at least both ends of the air passage located at the lower end are formed into air passage connecting ports having a cap and other closing means that also serve as air outlets and can close themselves, and the outer size becomes a predetermined height and unit width. It is formed so as to be regulated as described above.
A curing mat for use in the concrete curing method according to any one of the claims or in the concrete curing apparatus according to claim 3. 5. A meandering or detour-like structure communicating from the lower side to the upper side of the air passage has a height such that the breathable sheet on the inner surface side and the non-breathable sheet on the outer surface side are arranged at predetermined intervals in the height direction. 5. The curing mat according to claim 4, which is realized by integrally forming in the partition wall portion in a staggered arrangement that is discontinuous in the lateral direction at each position and does not overlap the upper and lower sides. . 6. A tubular bag portion of an air permeable sheet on the inner surface side and a non-breathable sheet on the outer surface side, which are formed so that the ventilation connection ports are located on the same circumference, and are inserted into the tubular bag portion. The curing mat according to any one of claims 4 and 5, wherein the curing mat is combined with a connecting frame made of an elastic material having a two-fold structure that can be restored in a circular ring shape. 7. The curing mat according to claim 4, wherein an opening control valve is incorporated in the blower connection port. 8. A hanging margin having an eyelet fitting on the upper end side and forming an exhaust port as needed is formed over at least the entire width of the upper end side. The curing mat according to claim 4.