JP2006198905A - Method and apparatus for curing cement molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and efficiently perform the housing work of a cement molded product into an curing apparatus and the take-out work of the cement molded product from the curing apparatus after curing while uniforming and improving the quality and capacity of the cement molded product subjected to curing treatment, in the steam curing of the cement molded product. <P>SOLUTION: The curing apparatus used in the curing treatment of the cement molded product B comprises a shelf frame body 20 wherein a plurality of shelves on which cement molded products E are placed are arranged in a state that an interval is provided between the shelves in an up and down direction and the end parts of the shelves are opened in a horizontal direction, the end part closing plates 30 arranged to the open end parts of the shelf frame body 20 to close the open end parts, the elastic hermetically closing layers 40 arranged to the end part closing plates 30 comprising an elastic material and brought into contact with the open end parts of the shelf frame body 20, and pressing and fixing means comprising elastic strip materials 60 for pressing the end part closing plates 30 to the open end part of the shelf frame body to fix them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a curing apparatus and a curing method for a cement molded body, and more particularly to steam curing a cement molded body molded from a cement material when manufacturing a cement-based building material used as an exterior finishing material of a building. The present invention is directed to a curing device used for the work to be performed and a curing method using such a curing device.

Various cement boards are used as exterior finishing materials for the outer walls of buildings. By arranging the cement plates having a predetermined shape such as a rectangular plate to form the outer wall surface, the outer wall surface having excellent durability can be efficiently constructed.
Cement board used for exterior finishing is prepared by mixing aggregates into cement, adding water and kneading it into a slurry, filling it into a mold, or extruding it with an extruder. Mold to the shape of Even if the molded cement molded body is left as it is for a certain period of time, a hard cement board is obtained by hydrating and hardening the cement. This is called natural curing. Heat curing that promotes hydration and hardening by maintaining the cement molded body in a heated state is also employed. Steam curing in which a cement molded body is placed in a heated steam atmosphere is also known. Steam curing has a high work efficiency and can produce cement boards with stable quality performance economically.

In Patent Document 1, as a curing method for a cement-based inorganic plate (corresponding to a cement molded body), box-shaped trays with open bottom surfaces are sequentially stacked in an up-and-down direction to form a sealed space formed between upper and lower box-shaped trays. A technique for performing steam curing while containing a cement-based inorganic board is shown.
JP 2000-185982 A

In the curing apparatus for stacking the box-shaped trays described above, the cement moldings are placed one by one on the upper surface of the box-shaped tray, a new box-shaped tray is placed on top of the box-shaped tray, and the next cement molding is placed repeatedly. After the completion, the reverse operation is repeated again, and the cement molded body is taken out from the curing device, which causes a problem that the work is troublesome and the productivity is impaired.
After curing, the stacked box trays are removed one by one from the upper stage, so the upper cement molded body is immediately released from the sealed space and cooled by contact with the outside air, but the lower cement molded body is considerably delayed. Will be released from the enclosed space. For this reason, there is a problem in that the cooling process is shifted between the upper-stage cement molding plate and the lower-stage molding plate, resulting in variations in quality performance.

  The object of the present invention is to solve the problems of the prior art described above, and to store the cement molded product in the curing device and to take out the cured product easily and efficiently. The quality performance of the cured cement molded product. Is uniform and good.

A curing device for a cement molded body according to the present invention is a curing device used for a curing process of a cement molded body, and a plurality of shelves on which the cement molded body is placed are vertically spaced apart from each other in the horizontal direction. A shelf frame disposed in an open state, an end blocker disposed at the open end of the shelf frame to close the open end, and disposed at the end blocker and made of an elastic material. And an elastic hermetic layer that contacts the open end of the shelf frame, and pressing and fixing means for pressing and fixing the end blockage plate against the open end of the shelf frame.
[Cement molded body]
Basically, the present invention can be applied to a cement molded body that is employed in ordinary architectural use and other various uses. Examples of such cement moldings include fiber reinforced cement, foam cement, lightweight cement, and wood fiber cement.

The cement molded body is subjected to curing treatment after molding a slurry containing cement to promote hardening of the cement component.
The cement used as the material of the cement molded body may be a hardened material that can form a hardened body by hydration hardening as described above, and general Portland cement and other cement materials can be used. As a hardening material other than cement, gypsum, plaster, resin, or the like can be used in combination with cement.
In addition to cement, aggregates, reinforcing fibers, foaming agents, coloring agents, water reducing agents, antifoaming agents, oily substances, and the like are blended in the material of the cement molded body as necessary.

The cement molded body is molded with a sufficient amount of water added. As a molding method, a normal cement molding technique such as cast molding, extrusion molding, and centrifugal molding can be applied.
For example, in the case of a general building material, the shape of the cement molded body is often a rectangular plate. In addition to rectangles, there are polygonal shapes, circular shapes, and other flat plate shapes made of straight lines and curves. Basically, it has a flat plate shape, and can be provided with irregularities on the surface, a portion with a different thickness, or a hole. In addition to flat plates, there are corrugated plates, cylindrical surfaces, and more complicated curved surfaces. For example, some have a complicated three-dimensional shape such as a roof tile.
The size of the cement molded body varies depending on the purpose of use and required performance. For example, in the case of a rectangular plate-like cement molded body used as a building material, the length is usually set to 60 to 360 cm, the width is 30 to 90 cm, and the thickness is 1.2 to 5.0 cm.

Specific examples of the cement molded body include plastic concrete described in Japanese Patent Publication No. 1-30778. This plastic concrete is made by mixing and stirring a surfactant and vinyl monomer in cement slurry in which water is added to cement, forming a W / O emulsion material, polymerizing the vinyl monomer, and curing the cement. Can be obtained. It can be cured efficiently by steam curing.
[Curing treatment]
The cement molded body at the stage formed from the cement slurry described above contains a relatively large amount of moisture and is soft and easily deformed or damaged.

Hydration-hardening materials such as cement contained in the cement-molded body are cured by a hydration-curing action even when left at room temperature, and a cured product of the cement-molded body is obtained.
Curing treatment is performed in order to efficiently obtain a cured product of a cement molded body having high quality performance.
Basically, the curing technique employed in the production of ordinary cement molded bodies can be applied. In particular, heat curing in which the curing process is performed in a heated state is employed.
The curing temperature, curing time, and curing environment of heat curing are basically the same as those of normal heat curing technology. Steam curing in which heating steam is supplied and curing is a preferred method.
In the present invention, a curing device is used to hold the cement molded body when performing heat curing.

The curing device includes a shelf frame, an end closing board, an elastic sealing layer, and a pressing and fixing means.
[Shelf frame]
A plurality of shelves are arranged at intervals in the vertical direction. A cement molded body is placed on the upper surface of each shelf. If such a function can be realized, various structural techniques for shelf frames such as a rack member that can store a cement molded body and other articles can be employed.
The material of the shelf frame may be any material that can withstand the mechanical strength that can support the cement molded body and the heat and steam that are exposed in the curing treatment. A material having a high thermal conductivity can perform good heat transfer to the cement molded body. Usually, a steel material such as a steel plate can be used. Metal materials other than steel, such as aluminum alloys, ceramic materials, synthetic resin materials, reinforced resin materials, and the like can also be used.

As the shelf frame, for example, a structure in which a horizontal shelf is supported at an interval in the vertical direction with respect to a support column and a support plate extending in the vertical direction is employed. The shelf may be fixed to a support or a support plate, or may only be supported removably.
The planar shape of the shelf is set according to the dimensional shape of the cement molded body. For example, in the case of a rectangular plate-shaped cement molded body, a rectangular shelf that is slightly larger than the cement molded body can be adopted. Even when the planar shape of the cement molded body is a complicated shape other than a rectangular shape, a simple shape such as a rectangular shape is easier to manufacture and handle. In some cases, protrusions, protrusions, grooves, recesses, and the like for guiding or positioning the cement molded body are provided on the upper surface of the fence. It is also possible to provide ribs or reinforcing beams that increase the shelf resistance and rigidity of the shelf.

Each shelf is open at least one of the horizontal ends. All the remaining ends may be closed. The two opposite directions in the horizontal direction may be open ends, and the remaining two directions orthogonal to the open ends may be closed ends. Only a part of one edge may be opened. It is desirable that the size of the open portion is large enough to facilitate inspection and removal of the cement molded body.
As the structure of the shelf frame body, the shelf frame body can be configured by stacking the shelf frames formed separately from each other in the vertical direction. The shelf frame can be provided with a support column and a support frame for providing a space between the shelf surfaces of the upper and lower shelf frames.

Specifically, shelf frames that are U-shaped in cross section and extend in the horizontal direction and open at both ends in the horizontal direction can be configured to be stacked in the vertical direction. In this case, the end side orthogonal to the open end is closed.
The gap between the upper and lower shelves in the shelf frame body, that is, the height of the sealed space for housing the cement molded body is set to be slightly larger than the height of the cement molded body. A certain amount of space is also provided between each side of the cement molded body and the support material for the face material and the shelf frame that closes the end of the shelf. However, if there is a large space around the cement molded body in the sealed space, moisture evaporation from the cement molded body becomes excessive, and surface hardening is likely to occur.

Then, in the sealed space comprised by each shelf of the shelf frame body with which the open end part was obstruct | occluded by the edge part obstruction board, the exposed surface area X (cm < ² >) of the cement molded object in the state mounted in the shelf, and cement It is desirable that V = Y / X (cm) obtained from the void volume Y (cm ³ ) of the sealed space excluding the molded body satisfies the relationship 0 <V <3.33.
The shelf frame body may be provided with a structure such as a support for supporting the entire shelf frame body and a caster used for moving the shelf frame body. A hook or a fixture for fixing the shelf frame to a curing treatment room or the like can be provided.
[End blocker]
It arrange | positions at the open end part of a shelf frame, and obstruct | occludes an open end part.

By disposing the open end portion on the shelf frame body, the accommodation space of each cement molded body in the shelf frame body is closed over the entire surface.
A plurality of cement molding housing spaces are provided in the vertical direction. The end blockage board may be individually arranged for each storage space, but normally, a plurality of storage spaces are collectively closed with one end blockage board. If one whole side surface of the shelf frame is closed with one end blocker, the end blocker can be handled easily.
When a plurality of storage spaces arranged in the vertical direction are open on both end faces in the horizontal direction of the shelf frame body, it is accommodated by attaching end blockers that close the entire end face to both end faces of the shelf frame body. The space can be closed together.

If the open end of the shelf frame is a flat surface, an end blocker with a flat contact surface may be attached. When the open end portion of the shelf frame has irregularities, an end blocker having irregularities corresponding to the irregularities can be used. If the elastic sealing layer mentioned later is provided, even if there are some unevenness | corrugations in the open end part of a shelf frame body, it can block | close without a problem.
Either the end blocker or the shelf frame body is provided with an engagement structure, a fitting structure, or a connection structure in order to support the end blocker board on the shelf frame body and determine the mounting position and posture. be able to.
Specifically, the end closing board can have a locking piece locked to the upper end of the shelf frame.
The end blocker is configured by combining a main body portion that closes substantially the entire open end of the shelf frame and an auxiliary closing member that closes a portion that cannot be closed by the main body portion in terms of structure and handling. be able to. The auxiliary closing member is attached to the shelf frame body separately from the end closing plate, and the auxiliary closing member is also fixed by attaching the end closing plate to the outside thereof. Easy to install and remove. For example, when the end blocker is disposed from the upper end of the shelf frame body to near the lower end, but a part of the lowermost end cannot be closed, the open end portion and the end portion of the open end portion of the shelf frame body at the lower end. It is possible to combine a lower end closing member that is disposed between the lower end closing plate and closes the lower end of the open end.

The same material as that of the shelf frame can be used as the material of the end blocker. An aluminum material that is relatively light and easy to handle and excellent in mechanical strength and heat resistance is preferable.
In order to ensure that the shelf frame is closed by the end closing board, an elastic sealing layer is provided.
(Elastic sealing layer)
It arrange | positions at an edge part obstruction board, consists of an elastic material, and contact | abuts to the open end part of a shelf frame.
Even when the end blocker is a rigid body and it is difficult to cope with fine irregularities and displacements generated at the open end of the shelf frame, the elastic sealing layer is elastically adapted to the irregularities of the shelf frame. By finely deforming, the open end of the shelf frame is reliably closed.

As the material of the elastic sealing layer, a normal elastic material can be used as long as it can withstand the environmental conditions of the curing work and can be elastically deformed. Specific examples include synthetic resin foams, synthetic resin elastomers, rubber, woven fabrics, and fiber aggregates. The EPDM resin foam can exhibit various functions necessary for the elastic sealing layer. A plurality of material layers may be laminated. The thickness of the elastic sealing layer varies depending on the material used and required performance, but can usually be set in the range of 5 to 50 mm.
The elastic hermetic layer can be provided on the entire surface of the end closing board that contacts the open end of the shelf frame. When the end closing board and the auxiliary closing member are used in combination, the auxiliary closing member may be provided with an elastic sealing layer, or the auxiliary closing member is not provided with an elastic sealing layer. In some cases. While sandwiching an auxiliary closure member between the elastic sealing layer provided on the end closure board and the end of the shelf frame body, the auxiliary closure member is pressed against the shelf frame body to ensure closure, Even in a portion where there is no auxiliary closing member, it is possible to prevent a gap from being generated between the end closing plate and the shelf frame.

The elastic sealing layer may be fixedly installed on the end blockage board, or may be detachably attached to the end blockage board. After the elastic sealing layer is disposed on the end face of the shelf frame body, the elastic sealing layer sandwiched therebetween may be attached by fixing the end blockage board to the shelf frame body.
[Pressing and fixing means]
There is a possibility that the open end portion of the shelf frame body is not sufficiently closed only by arranging the end block board at the open end portion of the shelf frame body via the elastic sealing layer. Curing steam may enter the space containing the cement molded body inside the shelf frame. There is also a concern that the end blockage will be lifted or displaced by the pressure of the steam.

The above-mentioned problems can be solved by pressing and fixing the end closing board to the open end of the shelf frame with the pressing and fixing means.
As the pressing and fixing means, a mechanism or device used in a normal mechanical device or the like can be adopted. Specifically, physical mechanical mechanisms such as a spring mechanism, a toggle mechanism, a jack mechanism, a wedge mechanism, and a cam fastening mechanism can be employed. Electromagnetic attractive force and repulsive force can also be used.
As a pressing and fixing means, an elastic band member is provided that is routed from the back of the end blocker disposed at the open end of the shelf frame to both sides of the shelf frame, and both ends are fixed to the sides of the shelf frame. be able to. As the elastic band, a rubber belt or a packing belt used for fixing or positioning a transportation article can be used. Similarly to the elastic hermetic layer, the elastic band needs to have environmental resistance that can withstand the curing environment. Removable fixing means such as a hook for locking the elastic band and a stopper for clamping the elastic band can be provided on the side surface of the shelf frame.

[Curing method]
The cement molded body is cured using the curing apparatus described above.
Normal curing treatment technology is applied to basic work procedures and work conditions.
Specifically, a method of combining the following steps can be employed.
<Process (a)>
Place the cement molded body on each shelf of the shelf frame. At this stage, the end blocker is removed.
When a shelf is previously arranged on the shelf frame body, the cement molded body is inserted from the open end side of each shelf arranged in the vertical direction, and the cement molded body is placed on the upper surface of the lower shelf. If both ends of the shelf frame are open ends, the cement molded body may be inserted from either side. Moreover, you may attach the edge part obstruction | occlusion board beforehand to the one open end part of a shelf frame.

When the shelf frame is configured by stacking a plurality of shelf frames vertically, the shelf frame may be assembled in advance by stacking the shelf frames, or the cement molded body is placed on the shelf frame And the operation | work which mounts a new shelf frame on it alternately can be repeated, and a shelf frame body can also be assembled.
The cement molded body to be accommodated in the shelf frame may be a cement molded body that has been hardly cured immediately after molding, or a cement molded body that has been cured to some extent after a certain period of time has elapsed after molding. It may be. The cement molded body extruded from the extruder can be cut into a certain length and simultaneously stored in the shelf frame. After transporting the cement molded body to the inside of the curing treatment chamber, it may be accommodated in a shelf frame arranged in the curing treatment chamber, or it may be separated from the shelf frame body before being carried into the curing treatment chamber. It is also possible to place cement molded bodies on individual shelf frames and shelf boards and transport the cement molded bodies together with the shelf frame bodies or bring them into the curing treatment room.

<Steps (b) to (c)>
An end closing board is disposed on the open end of the shelf frame through an elastic sealing layer.
When the above-described auxiliary end closing material is used, it is arranged at a predetermined position before or simultaneously with the end closing board.
Thereafter, the end blockage is pressed and fixed to the open end of the shelf frame by the pressing and fixing means.
Thereby, the accommodation space of the cement molded body is closed.
When the end blocker and the elastic sealing layer are pressed against the end face of the shelf frame body, even if the end face of the shelf frame body has irregularities, the elastic sealing layer elastically deforms and the gap is reliably closed. It is. The storage space for the cement molded body is maintained in a reliable closed state. By applying a sufficient pressing force, the closed state is not impaired even if an external force is applied in the movement of the shelf frame or in the curing process.

As a result, the cement molded body and moisture inside the cement molded body do not escape excessively from the space where the cement molded body is accommodated. It is also possible to prevent external air from entering the housing space and impairing the surface characteristics of the cement molded body.
In addition, the accommodation space of a cement molded object does not need to be a perfect airtight state. What is necessary is just an airtight state which can achieve the objective of this invention. Even if there is a slight flow of air or water vapor, the difference in the curing action between the surface and the inside of the cement molded body may not be excessively increased. Moreover, when the pressure rises excessively in the internal space of the cover lid, the pressing force by the pressing and fixing means can be set to such an extent that the pressure can be released.

The storage space for the cement molded body may be closed just before the curing treatment is started. Before the shelf frame body is carried into the curing treatment chamber, an end block board may be attached to the shelf frame body and pressed and fixed by the pressing and fixing means.
<Step (d)>
Steam is supplied to the outer space of the curing device, and the cement molded body accommodated in the sealed space composed of the shelf frame body and the end block board is steam-cured.
The treatment after the heating can be performed in the same manner as a normal curing treatment. It depends on processing conditions and required performance. The heating atmosphere may be a normal air atmosphere. Heating steam can be introduced to heat the curing chamber. Usually, the heating temperature is set to 30 to 90 ° C., and the heating time is set to 18 to 48 hours.

<Removal of cement molding>
The cement molded body that has been subjected to the curing process is taken out of the shelf frame and sent to the next processing step.
When the curing process for a predetermined time is finished, the pressing and fixing means is released, and the end blocker and the elastic sealing layer are removed from the shelf frame. The accommodation space for the cement molded body is opened to the outside. The accommodation space and the cement molded body are cooled by the outside air flowing into the accommodation space or the air heated inside the accommodation space escaping to the outside. Moisture and vapor accumulated in the housing space are also released to the outside. Since the storage spaces of the respective shelves are opened to the outside almost at the same time, cooling and the like of each cement molded body proceeds under the same environmental conditions.

The cement molded body can be sent to the next processing step or storage place in a state of being accommodated in the shelf frame, and then taken out from the shelf frame.
When taking out the cement molded body from the shelf frame, the cement molded body can be taken out from the open end of the shelf frame. Even in the case where the shelf frames are stacked one above the other, the cement molded body can be taken out without separating the individual shelf frames. Of course, it is also possible to take out the cement molded body after sequentially separating the stacked shelf frames.
<Other processes>
Before or after each of the above steps, the same processing steps as those for manufacturing a normal cement molded body can be performed.

  For example, the cement molded body that has been subjected to the curing treatment can be sent to a shipping or storage work process. The surface of the cement molded body can be painted or coated. It is also possible to attach a metal fitting or member necessary for construction to a building to the cement molded body, or to process a hole or groove for attaching the metal fitting or member.

In the curing apparatus and curing method for a cement molded body according to the present invention, the end blocker is pressed through the elastic sealing layer to the open end of the shelf frame in which the cement molded body is accommodated in each of the plurality of shelves. By fixing them, the open end of the shelf frame can be reliably closed. In this state, if curing treatment is performed, it is possible to satisfactorily prevent the heating steam for curing from entering the cement molding housing space, and to cure a large number of cement moldings efficiently and with uniform quality. Can do.
And in the state which removed the edge part obstruction board from the shelf frame, the accommodation space of each cement molding is open | released outside in the open end part of a shelf frame. The cement molded body to be subjected to the curing treatment can be carried into the accommodation space from the open end of the shelf frame. Even if the shelf frame is configured by vertically stacking a plurality of separately formed shelf frames, the cement molded body can be accommodated later in the previously assembled shelf frame. . Workability of curing treatment is improved.

After finishing the curing process, simply removing the end blocker opens the sealed cement molding space to the outside at the same time, allowing outside air to flow in, or quickly releasing internal moisture to the outside. To do. The cement molded body is quickly cooled, and the next operation on the cement molded body can be started immediately. In addition, since a large number of cement molded bodies accommodated in the shelf frame are released or cooled to the outside under the same conditions, it is possible to prevent differences in quality performance of the cement molded bodies due to differences in the accommodation locations.
The cement molded body accommodated in the shelf frame can be taken out from the open end. For example, unlike a curing device having a structure in which box trays are stacked, a troublesome operation of separating the box trays in order from the top is not required.

The embodiment shown in FIGS. 1 to 4 is directed to manufacturing a cement molded body that is an exterior building material for construction.
[Manufacture of cement moldings]
When the exterior wall surface of a building is finished and constructed as a cement molded body, a rectangular thick plate-shaped cement molded plate B that is attached to the outer wall is manufactured.
Cement molding board B mixes additive materials such as fiber materials and aggregates with cement, and further extrudes a molding material prepared in a slurry form by adding water using an extrusion molding machine. It is cut every time. The cement-molded board B molded in this manner is heated and cured, whereby the cement is hydrated and hardened to become a cement-formed board B having sufficient mechanical strength and hardness.

In the heat curing of the cement molded board B, the cement molded board B in a water-containing state immediately after molding is stored in a heating furnace or a heat treatment chamber and held for a certain period of time to maintain the heated state and promote hardening. Usually, steam curing is performed to supply heating steam to the processing chamber.
[Curing device]
FIG. 1 shows a holding state of the cement molded plate B inside the curing treatment chamber.
A shelf frame body 20 is constructed by stacking a number of shelf frames 22 on the mounting table 10 that supports the entire curing device. On the upper surface of each shelf frame 22 constituting the shelf frame body 20, a cement molded body B for performing a curing process is placed.

<Shelf frame>
As shown in detail in FIG. 3, the shelf frame 22 is flat and has a frame shape in which a cross-sectional shape that is flat and has a U-shape that opens downwardly extends in the length direction. By stacking the U-shaped shelf frame 22 up and down, a space that can accommodate the cement molding plate B is formed between the horizontal surfaces of the shelf frame 22. As shown in FIGS. 3 and 4, the upper and lower surfaces and the left and right side surfaces are surrounded by the shelf frame 22, and the housing space penetrates the shelf frame body 20 from one end to the other end in the horizontal direction and is opened to the outside. ing. As shown in FIG. 2, the planar shape of the shelf frame 22 is a rectangular shape that is slightly larger than the cement-molded plate B.

<End blocker>
As shown in FIG. 1, end closing plates 30, 30 are arranged on both end surfaces of the shelf frame 20 where the accommodation space for the cement molded body B is opened to the outside. The end closing board 30 is made of an aluminum plate by a processing means such as press molding or welding. As shown in FIG. 3, the end closing board 30 has a rectangular shape that is substantially the same as the rectangular shape of the shelf frame 20, but is slightly higher than the lower end of the shelf frame 20. Is set. The left and right sides and the upper side of the end blockage board 30 are bent to serve as reinforcing ribs that enhance the rigidity or deformation resistance of the end blockage board 30.

Handles 36 are provided on the left and right side edges of the end block 30. The handle 36 is formed by bending a metal bar into a U shape and is fixed to the end closing plate 30 by welding or the like. As shown in FIG. 4, the handle 36 serves as a clue when carrying the end closing board 30, arranging it on the end face of the shelf frame 20, or removing it.
<Elastic sealing layer>
An elastic sealing layer 40 having a rectangular thick plate shape that is the same as the planar shape of the end blocker 30 is provided on the surface of the end blocker 30 that is in contact with the shelf frame 20. The elastic sealing layer 40 is made of EPDM foam, and is adhesively fixed to the end closing board 30.

<Auxiliary closing frame>
As shown in FIG. 2 or 4, a locking piece 34 is provided near the left and right corners on the upper end side of the end closing board 30. The locking piece 34 is formed by bending a part of the aluminum plate constituting the end closing board 30 and protrudes beyond the elastic sealing layer 40 toward the shelf frame 20. As shown in FIG. 1, when the locking piece 34 is locked to the upper end surface of the shelf frame body 20, the end blocker 30 is supported and positioned on the shelf frame body 20.
In a state where the end closing board 30 is supported by the shelf frame 20 by the locking piece 34, between the lower end of the end closing board 30 and the lower end of the shelf frame 20 or the upper end surface of the support base 10, There is a little gap. This has a function of preventing the end blockage board 30 from being lifted from the end surface of the shelf frame body 20 and a gap formed by the lower end of the end blockage board 30 coming into contact with the support base 10. It is inevitable that a certain degree of variation occurs in the height of the shelf frame 20 configured by stacking the shelf frames 22. If the height of the end blockage board 30 is determined slightly lower than the design height of the shelf frame body 20, the end blockage board 30 is surely arranged on the end surface of the shelf frame body 20, and the locking piece 34. Support by can also be ensured.

An auxiliary closing frame 50 is used to close the open end of the shelf frame 20 at the lower end of the end closing board 30. The auxiliary closing frame 50 is made of the same metal plate material as the end closing board 30.
As shown in FIGS. 3 and 4, a horizontally-long rectangular front piece 52 covering the end face of the shelf frame 22 arranged at the lowermost end of the shelf frame body 20, and a folded piece 54 on the upper side and the left and right sides of the front piece 52, 56. The upper folded piece 54 is hooked on the upper end surface of the shelf frame 22 and supported by the shelf frame 22. The shelf frame 22 is sandwiched between the left and right folded pieces 56 on the left and right sides. The auxiliary closing frame 50 is attached in a state of being accurately positioned with respect to the shelf frame 22. The lower side of the auxiliary closing frame 50 is in contact with the upper surface of the support base 10 while reliably covering the lower end of the shelf frame 22. As a result, the end face of the shelf frame 20 can be reliably closed even below the lower end of the end closing board 30.

As shown in FIG. 1, the auxiliary closing frame 50 is fixed in a state of being pressed against the shelf frame body 20 by attaching the end closing plate 30 to the outside of the auxiliary closing frame 50 via the elastic sealing layer 40. .
In FIG. 4, when the cement molded body B is not accommodated inside the shelf frame 22 at the lowermost end, there is no problem even if the auxiliary closing frame 50 is not used.
<Pressing and fixing means>
As shown in FIG. 1, in a state where the end blockers 30, 30 are arranged on both end surfaces of the shelf frame body 20, the top and bottom are extended from the back of the end blockers 30, 30 to the left and right side surfaces of the shelf frame body 20. The elastic band body 60 made of a rubber band is routed around the two places. The end of the elastic band body 60 is supported by a fixing pin 62 protruding from the side surface of the shelf frame body 20.

The elastic band body 60 is attached in a sufficiently stretched state. The elastic restoring force of the elastic band body 60 fixes the end blockage board 30 and the elastic sealing layer 40, and further the auxiliary closing frame 50 in a state where it is strongly pressed against the end surface of the shelf frame body 20. Therefore, the elastic sealing layer 40 is in a state where it is crushed elastically in the thickness direction. Even if there is a level difference or unevenness for each shelf frame 22 on the end face of the shelf frame 20 in which the shelf frames 22 are stacked, the elastic sealing layer 40 is elastically deformed so as to fill such unevenness.
<Void volume and exposed surface area>
As shown in FIG. 5, the cement molded body B placed on the upper surface of the shelf frame 22 in a state where the cement molded body B is accommodated in a sealed space formed between the shelf frames 22 of the shelf frame body 20. The exposed surface area X is the total area of the upper surface of the cement molded body B and the four side surfaces.

The volume excluding the volume occupied by the cement molded body B from the total volume of the sealed space is the void volume Y.
The exposed surface area X represents an area where moisture can evaporate from the cement molded body B in the curing process. The larger the exposed surface area X, the easier the moisture evaporates. The void volume Y represents the size of a space where evaporated water can exist as vapor. As the void volume Y increases, a larger amount of vapor can be retained in the air in the void, and moisture evaporation from the cement molded body B becomes easier. By designing the shelf frame 22 so that the ratio of the void volume Y to the exposed surface area X is appropriate, water evaporation from the cement molded body B in the curing process can be appropriately adjusted. The problem of poor curing on the surface of the cement molded body B due to excessive water evaporation can be solved.

[Curing process]
<Preparation work>
The cement molding plate B extruded and cut from the above-described extrusion molding machine is supplied to the upper surface of each shelf frame 22 constituting the shelf frame body 20. It is also possible to cut out at the same time as extrusion from the extruder and send it to the upper surface of the shelf frame 22.
As shown in FIG. 4, the cement molding plate B is placed on the upper surface of the shelf frame 22 while sequentially stacking the shelf frames 22 on the support base 10. In addition, after assembling all the shelf frames 22 and assembling the shelf frame body 20 in advance, the cement molding board B is fed into the accommodation space between the shelf frames 22 from the open end of the shelf frame body 20. You can also.

After the shelf frame 20 is assembled and the cement molding plate B is accommodated, the auxiliary closing frames 50 are attached to the lower ends of the shelf frame 20 at the lower ends. After that, the end closing board 30 is attached.
As shown in FIG. 1, the locking piece 34 of the end closing board 30 is locked to the upper end of the shelf frame 20 to be positioned and supported.
Elastic band members 60 are attached from the back surface of the end blocker 30 to both sides of the shelf frame 20, and the end blocker 30, the elastic sealing layer 40, and the auxiliary member are supported by the elastic restoring force of the stretched elastic band member 60. The closing frame 50 is firmly pressed against the end face of the shelf frame 20 and fixed.
Since the elastic sealing layer 40 is elastically deformed, the steps and irregularities generated on the end surface of the shelf frame body 20 can be reliably filled and the open end portion of the shelf frame body 20 can be closed.

<Curing treatment>
The entire curing apparatus shown in FIG. 1 is sent to the curing treatment room. In the curing treatment room, the interior is heated by directly heating the internal atmosphere with a heater or by supplying heated steam from the outside. The heat energy in the high temperature atmosphere in the curing chamber is transferred to the cement molding plate B accommodated in the sealed space of the shelf frame body 20 through the shelf frame body 20 and the end block board 30.
When the cement molded board B is heated, the water in the cement molded board B tends to evaporate. However, since the storage space of the shelf frame 20 is sealed, the generated steam stays in the storage space. When the vapor pressure in the housing space increases, the evaporation of moisture from the cement-molded plate B hardly occurs. Since the surface of the cement molded board B is covered with water vapor in a high humidity state, the surface of the cement molded board B is excessively dried, the hydration hardening on the surface is inhibited, or the surface and the interior are cured. The situation does not change greatly.

When the internal pressure increases in the accommodation space of the cement molded plate B, the internal water vapor tends to escape through the gap between the open end of the shelf frame 20 and the end closing board 30. However, since the end block 30 is strongly pressed against the end surface of the shelf frame 20 by the elastic force of the elastic band 60, water vapor does not leak excessively. In addition, when the water vapor pressure in the storage space is excessively increased, the function of adjusting the water vapor pressure by allowing water vapor to escape from between the end face of the shelf frame 20 and the end blockage board 30 can be achieved.
In such a state, the cement molded plate B held for a predetermined time is cured well from the surface to the inside, and becomes a cement molded plate B with excellent mechanical strength and shape accuracy and stable quality.

<Removal of cement-molded plate B>
When the curing process is completed, the supply of the heating steam to the curing process chamber is stopped, and the cured cement-molded board B is taken out.
First, the elastic band member 60 is removed. Next, the end blockers 30 and the elastic sealing layer 40 on both sides are removed. The auxiliary closing frame 50 is also removed.
The shelf frame 20 is open to the outside at both ends. Hot air and water vapor accumulated in the respective accommodation spaces are released to the outside. Cold air flows from the outside. Since this phenomenon occurs almost simultaneously in all the accommodation spaces, all the cement molded plates B arranged in the vertical direction are exposed to the same environmental conditions.

Then, the inside of the curing treatment chamber may be taken out of the cement-molded plate B from the shelf frame 20, or it may be carried out from the curing treatment chamber while remaining in the shelf frame 20. The cement molding plate B can be taken out while removing the shelf frame 22 of the shelf frame body 20 in order from the top. It is also possible to take out the cement-molded plate B from the open end portion with the shelf frame 20 as it is. Since the cement molded plate B is sufficiently cured, there is no problem even if only the cement molded plate B is taken out of the shelf frame 20 and handled.
The hardened cement molded board B is sent to shipping or storage work, or sent to the next processing step such as a finishing step.

The concrete cement molding was cured, and the results were evaluated.
[Manufacture of cement moldings]
A cement molded body was produced according to a conventional method. Examples of the material of the cement molded body include Portland cement, water, an oil component, reinforcing fibers, and aggregates. The material of the cement molded body was extruded to obtain a cement molded body having a rectangular plate shape of 940 mm (width) × 37,000 mm (length) × 30 mm (thickness). The cement molded body is cured and cured to produce a cement cured plate product.
The curing apparatus having the structure shown in FIGS. The exposed surface area X of the cement molded body is 37,564 cm ² , the void volume Y is 42,550 cm ³ , and V = Y / X≈1.13 cm.

Curing conditions were wet heat curing by raising the temperature from 30 ° C. to 90 ° C. over 17 hours in an environment with a relative humidity of 98% and then maintaining at 90 ° C. for 17 hours.
After the curing treatment, it was dried at 115 ° C. for 7 hours to obtain a hardened cement board product.
The obtained cement-cured plate had a good surface-cured state and no surface ephro was observed.

  The present invention is applied, for example, to the manufacture of a cement molded body that is an exterior building material of a building, and can efficiently and economically manufacture a cement molded body having excellent quality performance.

1 represents an embodiment of the present invention, and is a partially sectional front view of the curing device in use Top view as above Partial cross-sectional side view Partial cross-sectional front view in the middle of housing cement assembly and device assembly work Side view (a) and front view (b) showing relationship between exposed surface area X and void volume Y

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mounting stand 20 Shelf frame 30 End blockage board 40 Elastic sealing layer 50 Auxiliary closure frame 60 Elastic belt material B Cement molding board

Claims (6)

A curing device for curing cement molded body,
A plurality of shelves on each of which the cement molded body is placed are spaced in the vertical direction and are arranged in a state where the horizontal ends are opened, and a shelf frame body,
An end closing board disposed at the open end of the shelf frame and closing the open end;
An elastic hermetic layer disposed on the end closing plate, made of an elastic material, and in contact with an open end of the shelf frame;
A curing device for a cement molded body, comprising: a pressing and fixing unit that presses and fixes the end blocker to the open end of the shelf frame. In the sealed space configured in each shelf of the shelf frame body whose open end is closed by the end closing board, the exposed surface area X (cm ² ) of the cement molded body in a state of being placed on the shelf, The cement molding according to claim 1, wherein V = Y / X (cm) obtained from the void volume Y (cm ³ ) of the sealed space excluding the cement molded body satisfies a relationship of 0 <V <3.33. Body curing device. The shelf frame body is configured by stacking the shelf frames vertically extending in the horizontal direction with a U-shaped cross section, the horizontal ends being opened,
The cement molded body curing device according to claim 1 or 2, wherein the end blocker is disposed at each of open end portions at both ends of the shelf frame in the horizontal direction. The end blocker has a locking piece locked to the upper end of the shelf frame,
The auxiliary | assistant closing frame which is arrange | positioned between an open end part and the said end blockage board in the lower end among the said open end parts of the said shelf frame body, and obstruct | occludes the lower end of the said open end part. The cement molded body curing device according to any one of the above. Elasticity in which the pressing and fixing means is routed from the back surface of the end block board disposed at the open end of the shelf frame body to both side surfaces of the shelf frame body, and both ends are fixed to the side surfaces of the shelf frame body. The curing apparatus for a cement molded body according to any one of claims 1 to 4, comprising a band material. A method for curing a cement molded body using the curing device according to any one of claims 1 to 5,
Placing the cement molded body on each shelf of the shelf frame (a);
A step (b) of placing the end closing board by bringing the elastic sealing layer into contact with the open end of the shelf frame;
A step (c) of pressing and fixing the end closing board to the open end of the shelf frame with the pressing and fixing means;
A step (d) of supplying steam to the outer space of the curing device and steam curing the cement molded body housed in a sealed space composed of the shelf frame and the end blocker.
Curing method of cement molded body containing

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