JP2011074652A - Concrete curing method and curing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete curing method and a curing apparatus, which shorten a construction period of the whole curing construction without requiring a new facility or an apparatus. <P>SOLUTION: The concrete curing method and an apparatus for use in the method include a bag body installed in a predetermined space from a concrete curing object surface and expandable and contractible, and a curing sheet arranged within the predetermined space. The curing sheet can be attached to and detached from the curing object surface of the concrete. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a concrete curing method and curing apparatus after formwork dismantling.

  After placing concrete and dismantling the formwork, various measures have been taken to prevent cracks caused by shrinkage of the concrete due to drying.

  Among them, for example, in Patent Document 1, as a wet curing device for concrete, for example, an air tube in which a perforated water conduit is attached to a nonwoven fabric as a water retention sheet that comes into contact with the concrete surface, and the nonwoven fabric is filled with gas A large number of can be seen in the axial direction of the lining tunnel.

  Further, Patent Document 2 uses a portal-shaped moving carriage equipped with a curing balloon and cures the lining concrete surface while moving the carriage.

  Furthermore, in Patent Document 3, a large number of air cells arranged side by side in the circumferential direction of the lining concrete can be connected by a hook-and-loop fastener so that the air cells can be released from each other. In some cases, the curing sheet is provided in an arch shape so that the air cell can be prevented from being bent due to the weight of water exuding from the lining concrete.

  Furthermore, according to patent document 4, what is cured by affixing a curing sheet to lining concrete via a wet adhesive is disclosed.

Japanese Patent Laid-Open No. 10-102773 JP 2005-299323 A JP 2007-205055 A JP 2008-156927 A

  However, with respect to Patent Document 1, the above-mentioned nonwoven fabric to which a water conduit can be attached requires the provision of special tools, and the trouble of attaching this at the time of construction has not been solved at all. However, there is a drawback in that it requires equipment to take in and out air from each of the air tubes arranged in the tunnel axis direction or to press against the tunnel inner surface with a separately prepared lifting jig. is there.

  Patent Document 2 cures the lining concrete with a curing balloon mounted by a portal-type moving carriage, and is suitable for initial curing because the curing extension in the tunnel axis direction is short. In the case of long-term curing, the equipment becomes large and it is not realistic in terms of cost.

  Furthermore, Patent Document 3 connects a large number of air cells arranged side by side in the circumferential direction of the lining concrete along the tunnel wall surface, and, like the above, although there is a merit that the equipment is simple, the air cell is directly connected to the concrete. There are doubts about the durability of the equipment for curing on the surface, especially air is put into a large number of air cells and abutted against the lining concrete and cured, each one is taken in and out, and there are many curing points It follows the conventional curing method in which the air cell must move and cure every place where it contacts the concrete surface.

  Further, in Patent Document 4, the curing sheet is cured by attaching the curing sheet to the lining concrete with the wet adhesive, but this is simple in terms of equipment. It is necessary to apply wet adhesive with a brush or roller and then apply a curing sheet, and in addition to using a large amount of wet adhesive, there is a construction cost, and the concrete surface is finished and the surface is cleaned. There is a construction problem that it takes time with people in the curing work.

  An object of the present invention is to provide a curing method and a curing device that do not require a complicated machine or equipment that requires control, and that can sufficiently secure a curing period necessary to develop the concrete strength of a tunnel.

The method of the present invention has been made to solve the above-mentioned object, the gist of which is a method for curing concrete after formwork dismantling, in a contracted state with a predetermined interval from the surface of the concrete to be cured A first curing body interposing step for placing a curing sheet from one side end of the concrete curing target surface within the interval to the other end, and A first pasting step in which the curing sheet is in close contact with the surface water of the surface to be cured by injecting and inflating the gas, and pulling off the gas from the bag body and contracting to remove the bag body from the curing sheet And the process.
Moreover, as another invention, there exists in the process of temporarily fixing the said curing sheet closely_contact | adhered to the said curing object surface after said 1st sticking process.

  Furthermore, as a gist of the invention, after the step of claim 2, the bag body used in the separation step is moved to a new curing target surface adjacent to the curing target surface and arranged at a predetermined interval. Bag body installation step, a second curing sheet intervening step of bridging a new curing sheet different from the above between the moved bag body and the new curing target surface, and expanding the bag body to There is a sheet to which a new curing sheet is added and a second pasting step for closely contacting the new curing target surface.

  For curing, air or lighter helium gas is suitable for expanding or contracting the bag. As a raw material for the curing sheet, vinyl chloride, polyethylene, polyester used for commercially available agricultural sheets, foamed resins thereof, aluminum foil, a sheet obtained by superimposing these, and the like can be considered. As the surface to be cured, the surface used for placing the concrete after dismantling the mold is used as it is, but depending on the state, the concrete surface may be sprayed before the curing sheet is attached. Further, as a material of the bag body, a synthetic fiber, a synthetic resin, a natural rubber, or a composite waterproof sheet joined together can be considered.

  The gist of the present invention device is a concrete curing device after formwork dismantling, from a curing sheet to be installed at a predetermined interval from the concrete curing target surface, and a bag body capable of contraction and expansion Thus, the bag body expands and contracts by injecting and discharging gas so that the curing sheet can be brought into close contact with the concrete curing target surface.

  The concrete of the surface to be cured to which the curing sheet by the bag of the apparatus of the present invention is attached may be a tunnel lining surface or a culvert surface.

  Moreover, as another invention of this invention apparatus, it exists in having added the fixing tool which temporarily fixes the said curing sheet closely_contact | adhered to the curing target surface of concrete. Here, as a fixing tool, an anchor with a female screw is embedded in advance when placing concrete, and after the curing sheet adheres to the concrete, the sheet is attached to a holding plate (material: aluminum composite material, FRP material, acrylic material). Screw the bolt into the female screw using a polycarbonate panel material, etc., and hold the curing sheet with the holding plate.

Furthermore, as another invention of the device of the present invention, a plurality of continuous chambers in which the inside of the inflating and shrinking bag body is partitioned by a partition wall provided with a vent hole along the direction of attaching and separating the surface to be cured is provided. Some are continuous, so that gas can be injected from any of the continuous chambers. The partition has one or more vent holes, and there are three or more partition walls in the bag.
The bag body of the device according to the present invention uses a continuous chamber which is continuously divided up and down partitioned by a partition wall provided with a vent hole, so that the continuous chamber is located at one end of the bag body at the end of the concrete surface. It is good to use what expanded the bag body by sending gas from the continuous hole to the adjacent continuous room, or contracted by the reverse path. Here, in the vent hole for gas, a check valve is used to press the gas into the bag body from the outside during expansion, and when contracting, a thin rod is inserted from the outside of the check valve, or one side of the bag body Gas can be discharged to the outside by the fastener attached to the, and new curing sheets can be attached to the concrete curing surface one after another and pulled apart.

  In the method of the present invention, a shrinkable bag body is placed at a predetermined interval on a concrete curing target surface, a curing sheet is bridged from one side end to the other end of the curing target surface within the interval, and the bag By injecting gas into the body and inflating, the curing sheet is pasted with surface water of the surface to be cured, and the bag is moved, and another new curing sheet is pasted adjacent to the surface to be cured. Since this process is repeated, a new curing sheet can be attached to the concrete curing target surface in sequence using the same bag body, and curing can be performed quickly with a small number of facilities.

  According to the present invention, a shrinkable bag body is placed at a predetermined interval from a concrete curing target surface, and then a curing sheet is disposed within the predetermined interval, and the bag body is expanded by gas injection and discharge. By alternately moving and contracting, it becomes possible to stick a new curing sheet to the concrete curing target surface sequentially.

These are the conceptual diagrams of the state which spanned the curing sheet on the curing balloon as a bag body. These are the conceptual diagrams of the state which expanded the curing balloon as a bag body of FIG. 1, and affixed the curing sheet | seat on the concrete curing surface. FIG. 3 is an explanatory view of a tunnel cross section embodying FIGS. 1 and 2. These are the conceptual diagrams as an Example of a bag. These are the flowcharts as an Example of the curing method of this invention.

  Without placing an adhesive on the curing sheet by disposing the contracted bag body on the concrete curing target surface with an interval, and interposing the curing sheet in the interval, the bag body is expanded. Because the concrete surface is attached to the surface to be cured with a concrete surface, no special installation equipment is required, a curing sheet is installed for the concrete, the concrete surface is prevented from drying, and the occurrence of cracks is suppressed. Realized method and curing device.

  FIG. 1 is a conceptual diagram of a state in which a curing sheet is stretched over a curing balloon as a bag body, and FIG. 2 is an expansion of the curing balloon as a bag body in FIG. 1 to attach the curing sheet to a concrete curing surface. It is explanatory drawing of a state. FIG. 3 is an explanatory diagram of the tunnel cross-sectional direction that embodies FIGS. 1 and 2, FIG. 4 is a conceptual diagram as an example of a bag body, and FIG. 5 is an example of a curing method of the present invention. It is a flowchart of.

  In FIG. 1, the lining concrete 1 is placed after tunnel excavation, and is cured to prevent cracks on its surface. In this figure, a vinyl chloride curing sheet 3 is interposed between the lining concrete 1 with a deflated balloon 2 made of synthetic fiber, synthetic resin, natural rubber alone or a composite material thereof. The balloon 2 has fans 4, 4 ′, 4 ″ for introducing air that lead to an air inlet 13 with a check valve attached to the inlet.

  FIG. 2 shows the state in which the balloon 2 is inflated by the fan 4 through a check valve (not shown) at the inlet 13 of the balloon 2 from the state of FIG. is there.

  FIG. 3 shows a tunnel having a semicircular cross section, and a curing device including a moving carriage 6 that travels on wheels 7 on rails 5 arranged in the tunnel axis direction. In the figure, the left half is the one in which the balloon 2 is deflated and a curing sheet 3 connected to a vinyl chloride sheet having a length of 1.5 to 4 m and a width of 2 to 5 m is arranged between the lining concrete 1 and the left half. Yes, the right half is a balloon 2 inflated with a curing sheet 3 in close contact with the concrete surface. The curing width of the movable carriage 6 that is the curing range of the lining concrete 1 is 2 to 5 m although it varies depending on the size of the tunnel. Note that the balloon 2 is fixed to a fixture 8 arranged at a predetermined interval in the frame 12 arranged at a constant interval in the tunnel circumferential direction of 12 to 30 m.

  When the balloon 2 is inflated as shown in FIG. 4, the entire balloon 2 becomes a substantially semicircular shape having a width of 2 to 5 m, and is divided into a plurality of sections in the tunnel circumferential direction (the number of partition walls 10 in the middle of the drawing is nine. Although there are actually about 15 bags depending on the size of the tunnel, the bag body is partitioned by a partition wall 10 having one air hole 9 in the circumferential direction of the tunnel. In this case, the balloon 2 is inflated and deflated by injecting and exhausting air from one end of the balloon 2 in the circumferential direction of the tunnel through a check valve.

Next, the curing method of the present invention will be described with reference to the flowchart of FIG.
In advance, the lining concrete 1 is placed using a mold (step 1), the mold is removed from the mold (step 2), and depending on the situation of the lining surface, water is sprayed or sprayed on the lining concrete 1 surface (step 3). After moving the movable carriage 6 on which the balloon 2 in a contracted state fixed to the fixture 8 arranged at predetermined intervals along the frame 12 is moved to the curing position of the tunnel (step 4), the curing sheet 3 is covered with the balloon 2. A curing sheet set that is moved and set on the frame 7 with a sheet unfolding device 11 (FIG. 3) in which one end of the curing sheet 3 is fixed in order to interpose between the concrete 1 and (step 5) “the left half of FIG. After that, air is put into the balloon 2 with a check valve from the fan 4 piped to the movable carriage 6 to inflate the balloon 2, and the curing sheet 3 is brought into close contact with the surface of the lining concrete 1 (step 6). By lining conc The seat 1 is cured (step 7), and the balloon 2 is deflated by extracting air (step 8). The movable carriage 6 is moved to the adjacent lining concrete surface (step 9), and is cured with a holding plate, which will be described later, if necessary. A required portion of the sheet is temporarily fixed (step 10), and then the steps 5 to 10 of the curing sheet set are sequentially repeated for curing for about one month. Here, when placing the lining concrete, a plurality of anchors with female threads are embedded in a required portion of the lining concrete in advance, and after the movable carriage 6 is moved, the anchor is closely attached to the lining tunnel surface. The curing sheet 3 can be temporarily fixed with a holding plate provided on the male screw base by screwing a male screw matched with the female screw. In addition, as another method for holding the curing sheet 3 on the lining concrete, jack up both ends of a semicircular support material that matches the curvature of the lining concrete, and attach the curing sheet 3 to the lining concrete. It can be temporarily fixed until the end of curing.
In addition, as a procedure for inflating the balloon 2 and bringing the curing sheet 3 into close contact with the concrete surface, a method in which one end of the concrete is in close contact with multiple ends as indicated by the circled number 1 → the circled number 2 → the circled number 3 below the arrow in FIG. Then, it is conceivable to make a close contact with the circle number 1 → the circle number 2 on the arrow from the upper center.

  In the said Example, although the curing method and curing apparatus of the lining concrete 1 using the mobile trolley | bogie 6 were demonstrated, it is not restricted to this in this invention, It can apply also when manufacturing a concrete culvert.

  The present invention is provided by a simple method and a simple device for sticking a curing sheet to a lining tunnel or a surface to be cured of a culvert with a balloon that expands and contracts.

1 Lining concrete 2 Bag (balloon)
3 Curing sheet 4 Fan

Claims (6)

  A method for curing concrete after formwork dismantling, a first bag installation step for disposing a contracted bag body at a predetermined interval from the concrete curing surface, and a concrete curing object within the interval A first curing sheet intervening step in which a curing sheet is bridged from one end of the surface to the other end, and the curing sheet is in close contact with the surface water of the curing target surface by injecting gas into the bag and expanding A concrete curing method comprising: a first pasting step, and a pulling step of removing the bag body from the curing sheet by drawing and contracting the gas of the bag body.   The concrete curing method further comprising a step of temporarily fixing the curing sheet in close contact with the curing target surface after the first pasting step of claim 1.   After the step of claim 2, a second bag installation step of moving the bag body used in the separation step to a new curing target surface adjacent to the curing target surface and placing it at a predetermined interval; A second curing sheet intervening step, in which a new curing sheet different from the above is bridged between the moved bag and the new curing target surface, and the bag is inflated to place the new curing sheet in the new curing sheet. A curing method for concrete, comprising a second pasting step for closely adhering to a curing target surface.   A curing apparatus for concrete after formwork dismantling, comprising a curing sheet installed at a predetermined interval from the concrete curing target surface, and a bag body capable of contraction and expansion, wherein the bag body is made of gas. A concrete curing apparatus characterized in that the curing sheet can be brought into close contact with the concrete curing target surface by expansion and contraction by injection and discharge.   5. The concrete curing installation according to claim 4, wherein a fixture for temporarily fixing the curing sheet in close contact with the concrete curing target surface is added.   In Claim 4 or 5, the inside of the bag body that expands and contracts is a series of a plurality of continuous chambers partitioned by partition walls provided with vent holes along the direction of attaching and separating the surface to be cured. Therefore, the concrete curing apparatus is characterized in that gas can be injected from any of the continuous connecting chambers.

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