JP2017149060A - Steam ejection device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam ejection device and method for discharging steam in a uniform state, for maintaining temperature and humidity in an ambient space of a concrete product, and producing a concrete product with high quality.SOLUTION: The invention comprises: an inner cylinder 10 whose one end is attached to a tip end of a steam ejection pipe 2 for concrete cure; a first sheet part 11 whose one end is attached to the steam ejection pipe 2, and covers an area having a specific distance to an ejection direction of steam SS from one end of the inner cylinder 10; an outer cylinder 12 whose one end is coupled to the other end of the first sheet part 11 and provided to cover an outer peripheral part of the inner cylinder 10; and a second sheet part 13 which is connected to the other end of the outer cylinder 12 in a state of forming a double cylinder by the inner cylinder 10 and the outer cylinder 12, and covers and fixes the other end of the inner cylinder 10. A method for performing concrete cure is configured so that, a steam ejection device is attached to the steam ejection pipe 2 and the concrete product is blocked from outside air, and in the state, steam is ejected from a tip end of the steam ejection pipe, for performing concrete cure.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steam ejection device and a steam ejection method.

  Conventionally, when curing (hardening) (raw) concrete into a product, concrete steam curing is performed to promote hardening of the concrete product. This concrete steam curing includes a curing chamber curing in which steam is filled into a dedicated curing chamber into which concrete is carried, and a stationary curing (sheet-curing curing) in which concrete is covered with a sheet and the sheet is filled with steam. In curing room curing, for example, a concrete formwork is carried into the curing room, and steam from the steam boiler is supplied to the curing room through a pipe from the steam jet pipe, and the curing room is filled with steam. . By maintaining the temperature and humidity in the curing room at a specific temperature and humidity, it is possible to eliminate unevenness in the temperature and humidity of the concrete in the mold surrounded by steam, and to manufacture a high-quality concrete product. In the stationary curing, a steam ejection pipe is inserted into the seat, and the seat is filled with steam.

  Here, since the steam supplied into the curing chamber or the sheet is ejected vigorously from the tip (exit) of the steam ejection pipe, a temperature difference and temperature unevenness occur between the ejection side of the tip and the opposite side, and the steam There is a problem that it is not possible to uniformly fill the entire curing room. This bias of steam causes temperature unevenness in the curing chamber or in the sheet, and deteriorates the quality of the concrete product.

  In response to such a problem, for example, Japanese Patent Application Laid-Open No. 2000-335987 (Patent Document 1) discloses a mist ejection device and method for curing a concrete product made of woven fabric or knitted fabric. In this invention, the steam that has been pumped is ejected into the curing chamber or in the sheet through the mist ejector made of woven or knitted fabric, thereby creating a uniform mist (steam) atmosphere around the concrete and curing effect. It is possible to improve and manufacture high quality concrete products.

JP 2000-335987 A

  Since the technique described in Patent Document 1 described above is a simple configuration in which a single woven or knitted fabric is connected to the tip of the steam jet pipe, the pressure of the steam near the tip is reduced. The amount of steam ejected from the vicinity of the tip cannot be reduced and the amount of steam ejected far from the tip is nonuniform. Therefore, the temperature and humidity in the curing room or the sheet filled with steam are also non-uniform, and there is a problem that the strength of the concrete product being cured varies and the quality of the manufactured concrete product is deteriorated. In addition, in the case of stationary curing, when steam is ejected vigorously from the tip, steam leaks from the gap between the sheet and the ground or from the torn part of the sheet, so that steam is wasted.

  In the prior art, a tube may be formed by wrapping a cloth with a very small mesh (hole) around the end of the steam jet pipe, but in this case, since the mesh of the cloth is too small, there is a difference between the internal pressure and the external pressure of the cylinder. A certain internal pressure must be applied in order to occur and to eject the steam. In particular, since the steam is normally ejected from the steam ejection pipe by opening and closing the solenoid valve, the steam is ejected only in the vicinity of the tip of the steam ejection pipe, and the ejection of the steam at the back of the cylinder cannot be expected. In addition, such a jet of steam has a problem that a load is applied to the cloth and the cloth is easily broken.

  In both curing and stationary curing, a formwork for placing concrete is used. The formwork is usually made of metal, and the thermal conductivity (W / m · K) of the metal is air. Compared to the thermal conductivity (W / m · K), it is 3000 times higher. Therefore, for example, when the steam ejected from the tube of the steam ejection pipe is not uniform as in the technique described above, when the steam hits a part of the mold locally, the heat of the steam is generated from the part. There is a problem that the heat of steam is wasted immediately and wasted.

  As another conventional technique, in a conventional steam ejection pipe, holes having a hole diameter of 5 mm to 6 mm are provided at intervals of 300 mm to 600 mm, and steam may be ejected from there. In that case, the steam is ejected from the hole. The steam has a certain directionality and is not ejected uniformly, and there is a problem that water liquefied due to a temperature difference between the inside and outside flows out of the hole at the time of ejection and wastes steam.

  Therefore, the present invention has been made to solve the above-mentioned problems, and by releasing steam uniformly, it is possible to maintain the temperature and humidity of the surrounding space of the concrete product and to manufacture a high-quality concrete product. It is an object of the present invention to provide a possible steam ejection device and a steam ejection method.

  The steam ejection device according to the present invention includes an inner cylinder, a first sheet part, an outer cylinder, and a second sheet part. The inner cylinder is a net-like cylinder, and one end is attached to the tip of a steam jet pipe for concrete curing. A 1st sheet | seat part is a sheet-like cylinder, One end is mounted | worn with the said vapor | steam ejection pipe | tube, and covers the area | region from the one end of the said inner cylinder to a specific distance toward the vapor | steam ejection direction. The outer cylinder is a mesh cylinder, and one end thereof is connected to the other end of the first sheet portion and is provided so as to cover the outer peripheral portion of the inner cylinder. The second sheet portion is a sheet-like lid, and is connected to the other end of the outer cylinder and covers the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder. And fix. The steam ejection device is attached to the steam ejection pipe, is disposed in the vicinity of a concrete product that requires concrete curing, and injects steam from a tip of the steam ejection pipe in a state where the concrete product is shielded from outside air. It is characterized by concrete curing. The mesh of the inner cylinder is coarser than the mesh of the outer cylinder.

  The steam ejection method according to the present invention includes a first step and a second step. The first step is a concrete in which a steam ejection device including an inner cylinder, a first sheet part, an outer cylinder, and a second sheet part is attached to the steam ejection pipe and concrete curing is required. Place it near the product. The inner cylinder is a net-like cylinder, and one end is attached to the tip of a steam jet pipe for concrete curing. A 1st sheet | seat part is a sheet-like cylinder, One end is mounted | worn with the said vapor | steam ejection pipe | tube, and covers the area | region from the one end of the said inner cylinder to a specific distance toward the vapor | steam ejection direction. The outer cylinder is a mesh cylinder, and one end thereof is connected to the other end of the first sheet portion and is provided so as to cover the outer peripheral portion of the inner cylinder. The second sheet portion is a sheet-like lid, and is connected to the other end of the outer cylinder and covers the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder. And fix. In the second step, after the steam ejection device is arranged, concrete curing is performed by injecting steam from the tip of the steam ejection pipe in a state where the concrete product is blocked from outside air.

  According to the present invention, it is possible to produce a high-quality concrete product while maintaining the temperature and humidity of the surrounding space of the concrete product by uniformly discharging the steam.

FIG. 1A is a schematic diagram of a steam ejection device according to an embodiment of the present invention (FIG. 1A), a schematic diagram of an outer cylinder and an inner cylinder (FIG. 1B), and a cross-sectional view taken along line AA in FIG. 1A (FIG. 1C). . Schematic diagram (FIG. 2A) in the case of using the steam ejection device according to the embodiment of the present invention in the curing room, Schematic diagram (FIG. 2B) in the case of using the steam ejection device according to the embodiment of the present invention in the curing sheet, It is. It is sectional drawing (FIG. 3A) of the longitudinal direction of the steam ejecting apparatus which shows the flow of the steam of the steam ejecting apparatus which concerns on embodiment of this invention, and sectional drawing (FIG. 3B) of the transversal direction of a steam ejecting apparatus. The top view (FIG. 4A) which shows the arrangement | positioning state of the concrete product and steam ejection apparatus in the curing sheet in Example 1, and the top view which shows the arrangement state of the concrete product and steam ejection apparatus in the curing sheet in the comparative example 1 (FIG. 4B). It is the photograph (FIG. 5A) which shows the discharge | release state of the vapor | steam from the vapor jet apparatus in Example 1, and the photograph (FIG. 5B) which shows the discharge | release state of the vapor | steam from the vapor | steam injection pipe in the comparative example 1. It is a graph which shows the relationship between the curing time and the space temperature in Example 1 and Comparative Example 1.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  As shown in FIG. 1A, the steam ejection device 1 according to the present invention includes an inner cylinder 10, a first sheet part 11, an outer cylinder 12, and a second sheet part 13. The inner cylinder 10 is a net-like cylinder, and one end 10a is attached to the tip 2a of the steam ejection pipe 2 for concrete curing. The first sheet portion 11 is a sheet-like cylinder, and one end 11a is attached to the steam ejection pipe 2, and an area from the one end 10a of the inner cylinder 10 to a specific distance D toward the steam ejection direction. cover. The outer cylinder 12 is a net-like cylinder, and one end 12 a is connected to the other end 11 b of the first sheet portion 11 and is provided so as to cover the outer peripheral portion of the inner cylinder 10 (exterior). The second sheet portion 13 is a sheet-like lid, and is connected to the other end 12b of the outer cylinder 12 in a state where a double cylinder is formed by the outer cylinder 12 and the inner cylinder 10, and the inner cylinder The other end 10b of 10 is covered and fixed.

  Here, when one end 10a of the inner cylinder 10 is attached to the tip 2a of the steam ejection pipe 2, a specific distance d1 is generated between the one end 10a of the inner cylinder 10 and the tip 2a of the steam ejection pipe 2. One end 10 a of the inner cylinder 10 is inserted into the tip 2 a of the steam ejection pipe 2, and a part of the inner cylinder 10 is covered in the vicinity of the tip 2 a of the steam ejection pipe 2. Furthermore, when one end 11a of the first sheet portion 11 is attached to the steam ejection pipe 2, a specific distance d2 is generated between the other end 11b of the first sheet section 11 and the tip 2a of the steam ejection pipe 2. As described above, the one end 11a of the first sheet portion 11 is inserted into the one end 10a of the inner cylinder 10 and the tip 2a of the steam ejection pipe 2, and the one end 11a of the first sheet portion 11 is inserted into the tip 2a of the steam ejection pipe 2. The exterior part 11c of the 1st sheet | seat part 11 and the vicinity part 2b of the front-end | tip 2a of the steam jet pipe 2 are fastened together by the fixing members 14, such as a string and a tape, and the 1st sheet | seat part 11 is carried out to the vicinity. The one end 11a is fixed to the steam ejection pipe 2. The center of the first sheet portion 10 is aligned with the center of the vicinity 2 b of the steam ejection pipe 2 by the fixing member 14. The specific distance D corresponds to the distance d1 + distance d2, and if the exterior portion 11c of the first sheet portion 11 is the specific distance d3, the total distance of the first sheet portion 11 is the distance D + distance d3. Correspond.

  Here, as shown in FIG. 1B, the inner cylinder 10 and the outer cylinder 12 are formed by rolling a woven or knitted sheet into a cylindrical shape. The inner diameter 10c of the inner cylinder 10 is set corresponding to the outer diameter of the tip 2a (or the main body) of the steam jet pipe 2, and the inner diameter 12c of the outer cylinder 12 is larger than the inner diameter 10c of the inner cylinder 10, for example, It is set to twice the inner diameter 10c of the cylinder 10. The size of the outer cylinder 12 in the longitudinal direction is set corresponding to the size of the concrete product, the size of the curing room, and the size of the stationary curing sheet, and the size of the inner cylinder 10 in the longitudinal direction is the first sheet portion. 11, the outer cylinder 12, and the second sheet portion 13 are inserted through the inner cylinder 10, and the other end 10 b of the inner cylinder 10 is aligned with the inner surface of the bottom surface 13 a of the second sheet portion 13. A specific distance d3 is set between the one end 10a of the tube 10 and the one end 11a of the first sheet portion 11.

  Here, when the outer peripheral part of the inner cylinder 10 is externally mounted inside the outer cylinder 12, a specific direction along the longitudinal direction of the inner cylinder 10 is provided between the outer cylinder 12 and the inner cylinder 10 as shown in FIG. 1C. It is preferable that a plurality of holding members are provided at a pitch and the inner cylinder 10 is fixed near the center of the outer cylinder 12, but the other end 10 b of the inner cylinder 10 is brought into contact with the inner surface of the bottom surface 13 a of the second sheet portion 13. In this state, the other end 10b of the inner cylinder 10 may be dropped downward.

  Now, the steam spraying device 1 is mounted on the steam spraying pipe 2 and is disposed in the vicinity of a concrete product that requires concrete curing, so that the concrete product C is shielded from the outside air.

  Here, in the case of the curing room curing in which the concrete product is cured in the curing room, as shown in FIG. 2A, for example, when a roll-up type curing room 3 is examined, a formwork in which concrete is cast is formed. The concrete product C is carried into the center of the roll-up type curing chamber 3, and the long main steam ejection device 1 is arranged along the longitudinal direction of the concrete product C. And the heat insulation sheet | seat 31 wound up above the entrance / exit 30 of the curing room 3 is lowered | hung, it covers over the entrance / exit 30 of the curing room 3, and it is set as the state which interrupted | blocked the concrete product C from the external air. Here, the steam ejection pipe 2 extending from the steam ejection apparatus 1 is connected to a steam boiler 32 provided outside the curing chamber 3. In addition, the entrance of the curing room 3 may be appropriately changed depending on the type of the curing room 3, and may be, for example, a metal door or a bellows type doorway.

  In addition, in the case of stationary curing in which concrete products are cured with a heat-insulating curing sheet, as shown in FIG. 2B, the steam ejection device 1 is arranged along the longitudinal direction of the concrete product C, and the steam ejection is performed. The periphery of the concrete product C including the apparatus 1 is covered with the curing sheet 4. And the concrete product C is made into the state interrupted | blocked from the external air by fixing the peripheral edge 40 below the curing sheet 4 to the ground G with fixing members, such as a reinforcing bar, for example. A steam ejection pipe 2 for connecting the present steam ejection device 1 is connected to a steam boiler provided outside. As shown in FIG. 2B, two steam ejection devices 1 are provided so as to surround the concrete product C.

  After the concrete product C is cut off from the outside air, steam is jetted from the tip 2a of the steam jet pipe 2. Then, as shown in FIG. 3A, the steam S blows out vigorously in a conical shape from the tip 2 a of the steam ejection pipe 2, passes through the inner cylinder 10, and is sent to the inner peripheral surface of the first sheet portion 11. Here, since the first sheet portion 11 is provided from the tip 2a of the steam ejection pipe 2 to a specific distance d2, the conical steam S that contacts the inner surface of the first sheet portion 11 is reflected. It bounces off, intersects inside the inner cylinder 10 and jets forward. This becomes the driving force of the steam S and passes through the inside of the inner cylinder 10. Further, the steam SI that has entered the inside of the inner cylinder 10 passes to the other end 10b of the inner cylinder 10 by using the pressure at the time of injection from the steam ejection pipe 2 as a driving force.

Here, the moved steam SI gradually loses pressure and goes to normal pressure, but consumes energy by an amount corresponding to a decrease in the pressure of the steam SI. The consumed energy (W) is calculated by the pressure (Pa) of the reduced amount × the volume (m ³ ) in which the steam SI has moved.

  The steam in the steam boiler is normally at a high temperature of 165 degrees at the time of occurrence, and if it passes through the piping from the place of occurrence and reaches the tip 2a of the steam ejection pipe 2, it decreases to 120 to 130 degrees and dissipates heat. Liquefies partly. On the other hand, the steam pressure of the steam boiler is, for example, 6 atmospheres, which is higher than 1 atmospheric pressure, and when steam in a high pressure state blows from the steam boiler to the steam ejection pipe 2, The tip 2a is at a high pressure of 6 atm. Therefore, the steam SI passing through the inside of the inner cylinder 10 arrives at the other end 10b of the inner cylinder 10 due to the propulsive force of the pressure, bounces back in the opposite direction from the dead end of the second seat portion 13, and is pushed back. Energy is consumed and there is almost no driving force. Further, the steam SI released from the tip 2a of the steam ejection pipe 2 collides with the pushed-back steam SI and loses propulsive force.

  Here, since the temperature of the steam SI is normally 100 degrees or more even in a state where there is no propulsive force, buoyancy is generated in the steam SI due to a temperature difference from the surroundings, and the steam SI moves upward. Further, the outside through the inner cylinder 10 and the external pressure 12 is 1 atm, and the internal steam SI is ejected to the outside by a differential pressure from the steam pressure of the steam SI. Further, even if the steam SI ejected to the outside is liquefied by radiating heat due to the movement inside the inner cylinder 10, the stitches of the inner cylinder 10 and the stitches of the outer cylinder 12 are doubled. Collides with double meshes, ruptures finely and pulverizes. On the other hand, the vapor pressure of the vapor SI before being ejected to the outside is as high as 6 atmospheres, but since it is 1 atmosphere outside, the liquefied water droplets are vaporized again due to the pressure difference. In particular, since the surface area of the fine water droplets is remarkably increased, it easily vaporizes and returns to the vapor SS. That is, even if the steam SI is liquefied by heat radiation or the like, the double cylinder of the inner cylinder 10 and the outer cylinder 12 can be immediately vaporized and ejected to the outside as the steam SS. The jetted steam SS is released upward by buoyancy.

  As described above, in the present steam ejection device 1, the steam SS is discharged in a well-balanced manner near the tip 2 a of the steam ejection pipe 2, in the vicinity of the cover portion 13, and between them due to the double cylinder configuration. Here, since steam SI consumes kinetic energy, it floats in space only by buoyancy.

  As shown in FIG. 3B, the steam SS rises from the surface of the outer cylinder 12 and diffuses around. Since the concrete product C is surrounded by the curing room 3 or the curing sheet 4, the floating steam SS covers the periphery of the concrete product C and stays around the concrete product C while maintaining a high temperature. Further, the vapor SS vaporized due to the pressure difference has a large surface area as a whole of the vapor SS, is easily vaporized, and easily deprives the surrounding temperature. In other words, the steam SS prevents a decrease in ambient temperature. Furthermore, it is difficult to collide with each other in the steam SS, and it is difficult to form water droplets. Further, when the steam SS that has risen only by buoyancy is filled upward in the curing chamber 3 or the curing sheet 4, it gradually descends downward as shown in FIG. 3B. The steam SS descending downwards drifts in a space and diffuses into the fine gaps of the concrete product C, etc., and the vertical and horizontal heights are kept at a high temperature evenly (shower effect). For this reason, a uniform steam atmosphere is formed in the entire space around the concrete product C in a short time, the ambient temperature and humidity are kept uniform, and a sudden drop in the temperature and humidity of the concrete product C is prevented. As a result, the strength of the concrete product C can be made uniform and sufficient quality can be ensured.

  Further, in the present invention, the haze-like steam SS rises only by buoyancy, so it does not hit the form of the concrete product C vigorously and drifts while fluctuating the form. Therefore, compared with the conventional case, the heat of the steam SS is not rapidly deprived by contact with the mold. Therefore, a high temperature state can be formed without supplying useless steam. In the present invention, since the steam SS rises from the entire outer cylinder 12, it is easy to spread the steam SS throughout the curing chamber 3 or the curing sheet 4. Furthermore, in the present invention, although the inner cylinder 10 and the outer cylinder 12 are doubled, the inner cylinder 10 and the outer cylinder 12 are net-like cylinders, so that steam is ejected from the tip 2a of the steam ejection pipe 2. The internal pressure of the inner cylinder 10 during the operation is basically 1 external pressure. For this reason, as compared with the conventional case in which a cloth or the like having a fine mesh is used, the problem that the steam is not ejected from the cloth does not occur unless steam having a high vapor pressure is supplied. Therefore, in the present invention, the steam SS can be released as a whole with a small amount of steam.

  Here, when steam curing apparatus 1 according to the present invention is attached to steam ejection pipe 2 and concrete curing is performed as Example 1, and when concrete curing is performed only with steam ejection pipe 2 as Comparative Example 1, The measurement results of the change in the temperature of the surrounding space of the concrete product with respect to the curing time in winter are shown below.

  FIG. 4 shows an arrangement state of the concrete product C and the steam ejection device 1 in the curing sheet 4 in Example 1 and Comparative Example 1. In the arrangement state in Example 1, as shown in FIG. 4A, the steam ejection pipe 2 in which the concrete product C is disposed in the vicinity of the center inside the rectangular curing sheet 4 and the steam ejection apparatus 1 according to the present invention is mounted. Was inserted into the curing sheet 4 and the steam ejection pipe 2 was installed in the vicinity of the west of the concrete product C. In the steam ejection device 1 on the west side, steam SS was set to be ejected from the tip 2a of the steam ejection pipe 2 from north to south. The longitudinal size of the steam ejection device 1 (outer cylinder 10) is, for example, 2.00 m, the specific distance d1 is 0.005 m (5 cm), and the specific distance d2 is 0.02 m (20 cm). did. On the north side and the south side (specifically, the southeast side) when viewed from the concrete product C, a temperature sensor 5 for detecting the temperature of the space surrounded by the curing sheet 4 and a concrete specimen 6 for compressive strength test (3 Book) and started concrete curing. And when concrete curing was completed, the compressive strength test of the concrete test body 6 was implemented. In addition, in the arrangement | positioning state in the comparative example 1, as shown to FIG. 4B, the front-end | tip 2a of the steam ejection pipe 2 was arrange | positioned at the intersection on a diagonal line seeing from the planar view of the frame of the concrete product C. In the frame of the concrete product C, since there is a gap of about 10 cm to 20 cm above the ground, the steam ejection pipe 2 was inserted there. The subsequent conditions were the same as those in Example 1.

  FIG. 5 is a photograph showing the state of vapor release in Example 1 and Comparative Example 1. As shown in FIG. 5A, in the first embodiment, the steam ejection pipe 2 injects steam through the steam ejection device 1, so that the steam SS spreads from the entire outer cylinder 12 of the steam ejection device 1. Has been released. Further, it is understood that the color of the steam SS is uniform and uniform without any shading. On the other hand, as shown in FIG. 5B, in the comparative example 1, since the steam ejection pipe 2 injects the steam as it is, the color of the steam S is thin in the vicinity of the tip 2a of the steam ejection pipe 2, and the steam becomes more away from the tip 2a. The color of S is dark. In addition, unevenness occurs in the entire steam S.

  FIG. 6 is a graph showing the relationship between curing time and space temperature in Example 1 and Comparative Example 1. FIG. 6 shows the space temperatures (north side and south side) detected by the two temperature sensors 5 in Example 1 and Comparative Example 1, respectively. As shown in FIG. 6, in Comparative Example 1, although the space temperature gradually increases from the time when the steam supply is started, it takes time to reach the target temperature. Furthermore, the degree of increase in the space temperature on the north side and the degree of increase in the space temperature on the south side are completely different, and temperature unevenness due to the non-uniformity of the steam S can be read. On the other hand, in Example 1, the space temperature quickly rises from the time when the steam supply is started, and immediately reaches the target temperature. It is further understood that the temperature continues to be maintained. Surprisingly, the degree of increase in the space temperature on the north side and the degree of increase in the space temperature on the south side almost coincide with each other, which indicates that temperature unevenness due to the uniformity of the steam SS does not occur. And since the curve of Example 1 is located above the curve of Comparative Example 1, in Example 1, the steam SS hardly forms water droplets, and the temperature and humidity in the surrounding space of the concrete product C are drastically reduced. It shows that it is preventing. Also in Example 1 and Comparative Example 1, when the concrete curing is completed, the curing sheet 4 is beaten and opened by the operator, so that the space temperature rapidly approaches the outside air temperature.

  In addition, there is no limitation in particular in adjustment of the space temperature after completion of concrete curing, For example, after completion of concrete curing, in order to prevent generation | occurrence | production of the crack by a temperature difference to concrete product C, space temperature is increased in steps. There is also a case of lowering.

In Example 1 and Comparative Example 1, the concrete specimen 6 was demolded after completion of concrete curing, and a compressive strength test was performed within 30 minutes after demolding. In Comparative Example 1, the compressive strength of the north concrete specimen 6 is 7.9 N / mm ² , 8.4 N / mm ² , 7.4 N / mm ² , and the compressive strength of the south concrete specimen 6 is It was 10.8 N / mm ² , 10.2 N / mm ² , 11.1 N / mm ² . In Comparative Example 1, the compressive strength of the north-south concrete specimen 6 varies, and it is understood that the strength of the concrete product C may be different depending on the north-south location. On the other hand, in Example 1, the compressive strength of the north concrete specimen 6 is 11.5 N / mm ² , 12.1 N / mm ² , 11.2 N / mm ² , and the compressive strength of the south concrete specimen 6 is Were 12.0 N / mm ² , 12.5 N / mm ² , and 11.6 N / mm ² . In Example 1, there is no variation in the compressive strength of the north-south concrete specimen 6, the compressive strength in the north-south is almost the same, and the strength of the concrete product C may be the same anywhere. It is understood that there is. Furthermore, it is understood that the compressive strength in Example 1 is higher than the compressive strength in Comparative Example 1, and the strength of the manufactured concrete product C is high. This has shown that the quality of the concrete product C of Example 1 is high.

  Here, the strength of the concrete product C increases as the integrated temperature in the concrete curing increases. The integrated temperature is calculated by integrating the concrete curing temperature at regular intervals of the concrete curing time. In FIG. 6, for example, the integrated temperature of Example 1 can be estimated by the area between the curve of Example 1 and the outside air temperature. The integrated temperature (area) of Example 1 is clearly larger than the integrated temperature (area) of Comparative Example 1. Therefore, it is understood that the compressive strength test result of the concrete specimen 6 reflects the integrated temperature of Example 1 and Comparative Example 1 in FIG.

  Therefore, it is understood that the steam ejection device 1 according to the present invention can produce a high-quality concrete product while maintaining the temperature and humidity of the surrounding space of the concrete product C by uniformly releasing the steam. . Further, in the steam ejection device 1 according to the present invention, the supply of the steam S can be stopped at an early stage, so that the cost (cost) required for the supply of the steam S can be reduced and the cost performance is excellent. .

  Here, although there is no limitation in particular in the sheet | seat which has the stitch which comprises the outer cylinder 12 and the inner cylinder 10, a mesh sheet, a porous sheet, a nonwoven fabric sheet, a punching metal sheet etc. can be mentioned, for example.

  Moreover, although there is no limitation in particular in the material of the outer cylinder 12 and the inner cylinder 10, For example, a fiber, a synthetic resin, etc. can be mentioned. Since the steam S is usually 100 degrees or more, the outer cylinder 12 and the inner cylinder 10 are required to have heat resistance, and examples thereof include a polypropylene resin, a polyester resin, and the like, or a combination thereof. If the material of the outer cylinder 12 and the inner cylinder 10 is made of synthetic resin, a certain restoring force is applied to the outer cylinder 12 and the inner cylinder 10, and for example, even if the outer cylinder 12 and the inner cylinder 10 are stepped on a transport vehicle, they are returned to the original and reused. I can do it.

  Further, although there is no particular limitation on the mesh of the outer cylinder 12 and the inner cylinder 10, for example, the mesh of the inner cylinder 10 is preferably coarser than the mesh of the outer cylinder 12. As a result, since the inner steam SI flowing inside the inner cylinder 10 has a high pressure, fine water particles liquefied by heat dissipation are passed through the inner cylinder 10 by passing the inner cylinder 10 having a coarse mesh first. Can be crushed and ruptured. Further, vaporization can be further promoted by further pulverizing and bursting the refined water particles by hitting the fine mesh of the outer cylinder 12. Further, the steam SI of the inner cylinder 10 is less likely to be clogged by passing through the coarseness of the mesh of the inner cylinder 10 and the fineness of the mesh of the outer cylinder 12, and may cause water droplets due to the heat radiation of the steam SI. Can be reduced.

  For example, the mesh of the outer cylinder 12 may be a mesh sheet having a longitudinal density of 26 / 2.54 cm and a lateral density of 28 / 2.54 cm. The mesh of the inner cylinder 10 may be a vertical mesh. A mesh sheet mesh having a density and a lateral density of 13 / 2.54 cm can be employed.

  Moreover, although there is no limitation in particular in the one end 10a of the inner cylinder 10, it is preferable if the one end 10a of the inner cylinder 10 is coat | covered with a heat resistant reinforcement member, for example. Examples of the reinforcing member include a high melting point resin coating material and a heat resistant coating material. As a result, the reinforcing member can prevent the one end 10a of the inner cylinder 10 from melting and collapsing, thereby enabling long-term use.

  Moreover, although there is no limitation in particular in the structure of the 1st sheet | seat part 10 and the 2nd sheet | seat part 13, a nonporous sheet | seat, a cloth-like sheet | seat, a film sheet etc. can be mentioned, for example. Examples of the material of the first sheet portion 10 and the second sheet portion 13 include fibers, synthetic resins, and the like, similar to the outer cylinder 12 and the inner cylinder 10.

  The shape of the first sheet portion 10 and the second sheet portion 13 is not particularly limited. For example, the shape of the first sheet portion 10 is a cylinder, and the shape of the second sheet portion 13 is a cone. It is good also as a shape. If the shape of the second sheet portion 13 is conical, the other end 10b of the inner cylinder 10 is likely to come into contact with the center of the inner surface of the cone, and the inner cylinder 10 is easily fixed near the center of the outer cylinder 12.

  Moreover, although there is no limitation in particular in arrangement | positioning of this steam ejection apparatus 1, since it is the structure of a double cylinder, it is preferable if it arrange | positions in the state which maintained rectilinear advance. Thereby, it becomes possible to reliably discharge the vapor SS of ultrafine water particles from all over the surface of the outer cylinder 12.

  As described above, the steam ejection device and the steam ejection method according to the present invention are useful as a steam ejection device and method for concrete curing using a curing room and a curing sheet, and by uniformly releasing steam, This is effective as a steam jetting apparatus and a steam jetting method capable of producing a high-quality concrete product while maintaining the temperature and humidity of the surrounding space of the concrete product.

DESCRIPTION OF SYMBOLS 1 Steam ejection apparatus 10 Inner cylinder 11 1st sheet | seat part 12 Outer cylinder 13 2nd sheet | seat part

The steam ejection device according to the present invention includes an inner cylinder, a first sheet part, an outer cylinder, and a second sheet part. The inner cylinder is a net-like cylinder, and one end is attached to the tip of a steam jet pipe for concrete curing. A 1st sheet | seat part is a sheet-like cylinder, One end is mounted | worn with the said vapor | steam ejection pipe | tube, and covers the area | region from the one end of the said inner cylinder to a specific distance toward the vapor | steam ejection direction. The outer cylinder is a mesh cylinder, and one end thereof is connected to the other end of the first sheet portion and is provided so as to cover the outer peripheral portion of the inner cylinder. The second sheet portion is a sheet-like lid, and is connected to the other end of the outer cylinder and covers the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder. And fix. The steam ejection device is attached to the steam ejection pipe, is disposed in the vicinity of a concrete product that requires concrete curing, and injects steam from a tip of the steam ejection pipe in a state where the concrete product is shielded from outside air. Thus, the first sheet portion and the second sheet portion bounce off the steam to perform concrete curing. The mesh of the inner cylinder is coarser than the mesh of the outer cylinder.

The steam ejection method according to the present invention includes a first step and a second step. The first step is a concrete in which a steam ejection device including an inner cylinder, a first sheet part, an outer cylinder, and a second sheet part is attached to the steam ejection pipe and concrete curing is required. Place it near the product. The inner cylinder is a net-like cylinder, and one end is attached to the tip of a steam jet pipe for concrete curing. A 1st sheet | seat part is a sheet-like cylinder, One end is mounted | worn with the said vapor | steam ejection pipe | tube, and covers the area | region from the one end of the said inner cylinder to a specific distance toward the vapor | steam ejection direction. The outer cylinder is a mesh cylinder, and one end thereof is connected to the other end of the first sheet portion and is provided so as to cover the outer peripheral portion of the inner cylinder. The second sheet portion is a sheet-like lid, and is connected to the other end of the outer cylinder and covers the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder. And fix. In the second step, after the steam ejecting device is arranged, the concrete product is blocked from outside air, and the steam is jetted from the tip of the steam ejecting pipe, so that the first sheet part and the second sheet The sheet part bounces off the steam and performs concrete curing.

Claims (3)

An inner cylinder that is a net-like cylinder, one end of which is attached to the tip of a steam ejection pipe for concrete curing;
A first sheet portion that is a sheet-shaped cylinder, one end of which is attached to the steam ejection pipe and covers a region from one end of the inner cylinder to a specific distance in the direction of steam ejection;
An outer cylinder that is a net-shaped cylinder, one end of which is connected to the other end of the first sheet portion and covers the outer periphery of the inner cylinder;
A second sheet that is a sheet-like lid and is connected to the other end of the outer cylinder and covers the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder And
With
The steam ejection device is attached to the steam ejection pipe, is disposed in the vicinity of a concrete product that requires concrete curing, and injects steam from a tip of the steam ejection pipe in a state where the concrete product is shielded from outside air. Thus, a steam ejection device characterized by performing concrete curing. The steam ejection device according to claim 1, wherein the mesh of the inner cylinder is coarser than the mesh of the outer cylinder. A reticulated cylinder, one end of which is an inner cylinder attached to the tip of a steam-curing pipe for curing concrete, and a sheet-like cylinder, one end of which is attached to the steam-ejection pipe, and from one end of the inner cylinder, A first sheet portion covering a region up to a specific distance toward the ejection direction of the first sheet portion, and a reticulated tube, one end of which is connected to the other end of the first sheet portion and covers the outer peripheral portion of the inner tube. An outer cylinder and a sheet-like lid that are connected to the other end of the outer cylinder and cover the other end of the inner cylinder in a state where a double cylinder is formed by the outer cylinder and the inner cylinder. A first step of attaching a steam jetting device comprising a second sheet part to the steam jetting pipe and arranging it in the vicinity of a concrete product that requires concrete curing;
A second step of performing concrete curing by injecting steam from the tip of the steam ejection pipe in a state where the concrete product is shielded from outside air after the steam ejection device is disposed;
A steam ejection method comprising: