JP4871229B2 - Method for producing concrete member - Google Patents

Description

  The present invention relates to a method for manufacturing a concrete member.

  There has been proposed a method for producing a concrete member that takes advantage of the property of high fluidity concrete, which is highly self-filling. According to this manufacturing method, vibration compaction can be omitted or reduced, so that the production efficiency can be improved as compared with the case of using ordinary concrete.

  By the way, when molding the upper surface (top end surface) of a concrete member into a curved surface or a rough surface, or when forming a relief for improving design on the upper surface of the concrete member, a lid type covering the high fluidity concrete. It is necessary to form a transfer surface imitating the finished shape (curved surface, unevenness, etc.) of the top end surface on the frame (see, for example, Patent Documents 1 and 2). In the case of ordinary concrete, the top end surface can be formed into a curved surface or rough surface by applying a trowel finish or a burr finish without using a lid formwork. Since the fluidity is higher and the setting time is longer, if a curved surface or a rough surface is formed by a trowel finish or a burr finish, there is a risk that it will disappear before the condensation is finished.

JP 2001-62813 A JP-A-10-15921

  As in Patent Documents 1 and 2, when the high-fluidity concrete is set and hardened in a state where the top end surface is covered with a lid formwork, the air avatar and the water avatar are generated by the entrap air and the latency that are floating on the top end surface. It may occur irregularly and damage the aesthetics. As disclosed in Patent Document 2, it is possible to suppress the generation of air avatars and the like by completely covering the top end surface with a lid mold frame having a gas-permeable finishing material, but completely removing it. It is not possible.

  For example, in a monorail track girder, it is necessary to make the surface roughness of the track surface uniform in order to ensure the running stability of the monorail vehicle. Since avatars occur irregularly, the surface roughness of the raceway surface cannot be made uniform.

  By the way, if the transfer surface imitating the raceway surface is formed on the bottom plate of the formwork structure and the raceway surface is molded with the bottom plate, the problem of air avatar can be solved. The manufacturing cost cannot be reduced because it is necessary to reverse the upper and lower sides of the orbital girder using a simple device. Further, depending on the size and shape of the orbital girder, it may not be possible to invert.

  From such a viewpoint, the present invention provides a method for producing a concrete member that takes advantage of the characteristics of high-fluidity concrete, and that can improve the finishing accuracy on the top end surface of the high-fluidity concrete. The task is to do.

  The present invention that solves the above-mentioned problems is a temporary molding in which the fluidity of the high-fluidity concrete is lowered in the mold structure covering the lid mold, and the top end surface of the high-fluidity concrete is temporarily molded with the lid mold Removing the lid formwork, leveling the top end surface, covering the top end surface with a decorative lid having a transfer surface imitating the finished shape of the top end surface, and placing the transfer surface on the top surface A method for producing a concrete member, comprising: a replacement step for closely contacting an end surface; and a main forming step for condensing and curing the high-fluidity concrete in a state where the transfer surface is closely contacted to the top end surface, The method is performed before the fluidity of the high-fluidity concrete is completely lost.

  In short, the present invention removes the lid formwork at the stage when the fluidity (self-filling) of the high-fluidity concrete is lowered, smoothes the top end surface and removes the air avatar and the like, and then covers the decorative lid on the top end surface. The top end face is formed into a finished shape by starting the setting of the high-fluidity concrete in such a state and further curing it. According to the present invention, since the air avatar or the like generated so far can be surely removed at the stage of replacing the lid mold with the decorative lid, the finished state of the top end surface formed by the decorative lid becomes good. As a result, the finishing accuracy is improved. High-fluidity concrete has high fluidity (self-filling property) and tends to be flat. Until the fluidity (self-filling property) of high-fluidity concrete decreases, the shape of the top end surface is reduced by the lid mold. It is necessary to hold it forcibly.

  When forming an inclined surface on the top end surface of the high-fluidity concrete, the lid mold is divided into a plurality of lid elements, and after placing the high-fluidity concrete, from the heel side of the inclined surface It is desirable to cover the lid elements in order. Since the high-fluidity concrete in the fresh state tends to become flat, the high-fluidity concrete above the inclined surface flows toward the lower side of the inclined surface, and there is a gap between the top end surface of the high-fluidity concrete and the lid element. However, if covering the lid element in order from the heel side of the inclined surface, it becomes possible to suppress the flow of high-fluidity concrete to the heel side, so even on the upper side of the inclined surface, The top end face and the lid element can be brought into close contact with each other, and as a result, a solid concrete member without a jumper or the like can be manufactured.

  In addition, if the lid mold is divided into a plurality of lid elements, the curvature, gradient, etc. of the lower surface of the lid mold can be changed relatively flexibly. Even if they are different from each other, it is possible to easily cope with them.

  The decorative cover may be divided into a plurality of decorative elements, and the cover element may be replaced with the decorative element in the replacement step. If it does in this way, since the operation | work which removes a cover element and the operation | work which covers a decorative element can be performed in parallel, it will become possible to shorten the time which manufactures a concrete member.

  During the temporary forming step, it is preferable to apply pressure to the high-fluidity concrete in the formwork structure and press the top end face against the lid formwork. In this way, it becomes possible to force the entrapment air contained in the high-fluidity concrete to rise to the top end surface, and furthermore, every corner of the space surrounded by the mold structure and the lid mold Therefore, it is possible to manufacture a dense concrete member with high dimensional accuracy.

  In addition, the mold structure or the lid mold is provided with a communication port that communicates with the interior of the mold structure, and a storage means that can store replenishment concrete having the same property as the high-fluidity concrete communicates with the communication port. And the upper end of the replenishing concrete stored in the storage means is positioned above the top end surface of the high-fluidity concrete during the temporary forming step, and the upper end of the replenishing concrete and the high-fluidity concrete The pressure generated due to the height difference from the top end face may be applied to the high fluidity concrete. In this way, it becomes possible to force the entrapment air contained in the high-fluidity concrete to rise to the top end surface, and furthermore, every corner of the space surrounded by the mold structure and the lid mold Therefore, it is possible to manufacture a dense concrete member with high dimensional accuracy. Moreover, even if a gap is formed in the space surrounded by the mold structure and the lid mold due to the deaeration of the entrap air, the high-fluidity concrete will spontaneously flow into the gap. Therefore, it is possible to manufacture a solid concrete member without a jumper or the like.

  Note that the communication port may be closed before the setting of the high-fluidity concrete is completed. If it does in this way, it can prevent that the concrete for replenishment hardens | cures and unites with the high fluidity concrete in a formwork structure.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the finishing precision in the top end surface of high fluidity concrete.

  As shown in FIG. 1, the manufacturing method of the concrete member which concerns on embodiment reduces the fluidity | liquidity of the high fluidity concrete C in the formwork structure 1 which covered the cover formwork 2 ((c) of FIG. 1). When the fluidity (self-filling property) of the high-fluidity concrete C is lowered, the lid mold 2 is removed (see FIG. 1 (d)), and the top end surface C1 of the high-fluidity concrete C is leveled and an air avatar The top cover C3 is covered on the top end face C1 (see (e) in FIG. 1), and the high end fluid C is set and hardened in this state to finish the top end face C1. To be molded.

  The finish shape of the top end face C1 includes a macroscopic finish shape that becomes the contour of the concrete member, and a microscopic finish shape that becomes a pattern or unevenness on the surface of the concrete member. In the present embodiment, the downwardly convex curved surface that becomes the contour of the concrete member is a macroscopic finish shape, and the fine unevenness for roughening that is engraved on the entire top surface C1 is a microscopic finish shape. The case is illustrated.

The high fluidity concrete C has high fluidity, but hardly causes material separation, and can carry aggregate and cement paste to every corner of the formwork structure 1 without vibration compaction. This is a self-filling concrete. The high-fluidity concrete C of the present embodiment is an ultra-high-strength fiber reinforced concrete having a hardened body with a compressive strength of 150 N / mm ² or more, and a powder containing cement, pozzolanic reactive particles, and aggregate has a water-cement ratio of 35. 1 to 4 volumes of fibers having a shape with a diameter of 0.1 to 0.3 mm and a length of 10 to 30 mm in a cement-based matrix obtained by mixing a high-performance water reducing agent and water so as to be less than or equal to 1% %. The slump flow value in the high fluidized concrete C in a fresh state is 50 to 70 cm, and the mortar flow value is about 22 to 28 cm.

Here, the pozzolanic reaction particles are particles made of, for example, silica fume, fly ash, blast furnace slag, a compound selected from kaolin derivatives, precipitated silica, volcanic ash, silica sol, and the like.
The maximum particle size of the aggregate is preferably 20 mm or less, and more preferably 5.0 mm or less.
Moreover, although there is no restriction | limiting in the material of a fiber, when the adhesiveness with concrete, easiness of material procurement, etc. are considered, it is desirable to make it from steel or organic compounds, such as polyvinyl alcohol and a polypropylene.

  As shown in FIG. 2, the mold structure 1 includes a bottom plate 11 that molds the bottom surface of the concrete member, and side mold frames 12, 12,... That mold the side surface of the concrete member, and the top surface is open. Presents a box shape. A flange 12 a that protrudes outward is formed at the upper end of the side mold 12. The upper surface of the flange 12a is a reference surface 12b that serves as a reference when finishing the top end surface C1 of the high-fluidity concrete C. In this embodiment, the upper surface of the flange 12a has a curved surface (inclined surface) according to the macroscopic finish shape of the top end surface C1. Molded.

  The lid mold 2 is a temporary molding of the top end face C1 of the high-fluidity concrete C in the setting process into a shape approximating its macroscopic finished shape, and is placed on the reference surface 12b of the mold structure 1 Is done. The lid mold 2 is provided with a weight that does not lift due to the pressure applied to the high-fluidity concrete C in a temporary forming process described later.

  The lid mold 2 of the present embodiment is divided into a plurality of lid elements 21, 21,. The lid element 21 is made of channel steel cut to a length that can be installed between the opposing side molds 12 and 12. In the present embodiment, since the lower surface of the lid element 21 is a flat surface, a plurality of lid elements 21, 21,... By turning the short side direction of 21 toward the inclination direction of the top end surface C1, the contour of the lower surface of the lid mold frame 2 is approximated to the macroscopic finished shape of the top end surface C1, but the lid element has a lower surface formed into a curved surface. (Not shown) may be provided continuously so that the outline of the lower surface of the lid mold 2 matches the macroscopic finished shape of the top end face C1.

  The lid mold 2 is formed with a communication port 2 a that communicates with the inside of the mold structure 1, and a reservoir 2 b communicates with the communication port 2 a. In this embodiment, the communication port 2a and the storage means 2b are provided in the outer edge portion of the lid mold 2 (more specifically, the lid element 21 positioned at the highest portion), but the communication port 2a and the storage means 2b are provided. It is not intended to limit the position and number of

  The storage means 2b consists of a cylindrical member joined to the opening edge of the communication port 2a. The storage means 2b stores a replenishment concrete C 'having the same property as the high fluidity concrete C (see (c) of FIG. 1).

  A decorative lid 3 shown in FIG. 1 (e) is for forming the top end surface C1 of the high fluid concrete C into a finished shape, and has a transfer surface 3a imitating the finished shape of the top end surface C1, and is a lid type. The top end surface C1 temporarily formed by the frame 2 is covered.

  The decorative lid 3 of the present embodiment is divided into a plurality of decorative elements 31, 31,. As shown in FIG. 3A, the decorative element 31 includes a plate-like core material 31a and a rough surface member 31b attached to the core material 31a. In FIG. 3, the top and bottom are reversed. The width dimension and the length dimension of the decorative element 31 are substantially equal to the width dimension and the length dimension of the lid element 21 (see FIG. 2), respectively, but are not intended to limit the dimension and the planar shape of the decorative element 31. .

  The core material 31a is made of a breathable wooden plywood (porous material). If the core material 31a is made of wooden plywood, the decorative element 31 becomes light and easy to handle, so that the manufacturing efficiency is improved. In addition, you may form many through-holes penetrated up and down to the core material 31a as needed.

  The rough surface member 31b engraves (transfers) fine irregularities that become rough on the top end face C1 of the high-fluidity concrete C, and is made of, for example, a breathable woven fabric or non-woven fabric. That is, the rough surface member 31b forms a microscopic finish shape of the top end surface C1. The surface roughness of the rough surface member 31b is substantially the same as the surface roughness required for the top end surface C1. In the present embodiment, the rough surface member 31b is attached to the entire lower surface (upper surface in FIG. 3) of the core material 31a. However, in the case where roughening is applied only to a specific portion, the position corresponding to the portion. The rough surface member 31b may be attached only to the surface.

  In the present embodiment, as shown in FIG. 1 (e), a plurality of decorative elements 31, 31,... The decorative lid 3 is formed by directing the short direction toward the inclination direction of the top end face C1.

  Next, the concrete member manufacturing method according to the present embodiment will be described in detail. The concrete member manufacturing method according to the present embodiment includes a placing step (see FIG. 1A), a lid mold installation step (see FIG. 1B), and a temporary forming step (FIG. 1C). A replacement step (see FIG. 1D), a main forming step (see FIG. 1E), and the like.

  As shown to (a) of FIG. 1, a placement process is a process of placing the fresh high flowable concrete C in the formwork structure 1. FIG. When a predetermined amount of high-fluidity concrete C is placed, the top end surface C1 is roughened (rough finish) using a wooden trowel or the like. Roughening with respect to the top end surface C1 is performed with reference to the reference surface 12b, and is performed in order from a low place to a high place. That is, in the present embodiment, the roughening is started from the center portion of the top end surface C1 that is the ridge (bottom of the curved surface) of the inclined surface S, and then the inclined surface S is roughened from the bottom to the top. do. The top end face C1 to which the roughening has been applied is sequentially covered with a non-breathable sheet 4 such as a vinyl sheet to prevent the top end face C1 from drying.

  The lid mold installation step is a step of covering the lid mold 2 (see FIG. 1C) on the top end face C1 subjected to roughening. In this embodiment, in order to cover the lid mold frame 2 on the top end face C1, as shown in FIG. 1B, a plurality of lid elements 21, 21, which become the lid mold frame 2 on the upper surface of the sheet 4 are provided. ... should be connected without gaps. The lid elements 21, 21,... Are sequentially covered from the side of the inclined surface S. That is, the first lid element 21 is installed on the ridge (bottom of the curved surface) of the inclined surface S, and then the second and subsequent lid elements 21, 21,... Are installed in order from the lower side of the inclined surface S.

  As shown in FIG. 1C, when all the lid elements 21, 21,... Are installed, the replenishing concrete C ′ is poured into the storage means 2b, and the upper end of the replenishing concrete C ′ is placed on the high fluid concrete C. It is located above the top end face C1. In this way, even if a space remains in the space surrounded by the mold structure 1 and the lid mold 2, the difference in height between the top end surface C1 of the high-fluidity concrete C and the upper end of the supplemental concrete C ′. The replenishment concrete C is replenished into the formwork structure 1 through the communication port 2a by the pressure generated due to the above, and the gap is filled with high-fluidity concrete C (replenishment concrete C ′). Furthermore, the top end surface C1 is in close contact with the lower surface of the lid mold frame 2 via the sheet 4. In addition, pressure is forcibly applied to the supplementary concrete C ′, and pressure higher than the pressure generated due to the difference in height between the high fluid concrete C and the supplement concrete C ′ is applied to the high fluid concrete C. Of course.

  The temporary forming step is a step of reducing the fluidity of the high-fluidity concrete C in the mold structure 1 covering the lid mold 2 and temporarily molding the top end surface C1 with the lid mold 2. Since the top end surface C1 is in close contact with the lower surface of the lid mold frame 2, the fluidity is lowered in a state where the top end surface C1 is along the contour of the lower surface of the lid mold frame 2. That is, the temporary forming step is a step of forcibly holding the shape of the top end face C1 until the fluidity (self-filling property) of the high fluidity concrete C is lowered.

  During the temporary forming step, entrap air, latency, etc. contained in the high-fluidity concrete C float on the top end surface C1, but in this embodiment, the top end surface C1 and the top ends of the supplementary concrete C ′ Since the pressure generated due to the height difference is applied to the high-fluidity concrete C, entrap air or the like is forced to float on the top end face C1. When the entrap air is degassed, the volume of the high-fluidity concrete C decreases. However, since the supplemental concrete C ′ is replenished spontaneously, the top end surface C1 is in close contact with the lower surface of the lid mold 2. The state to be maintained is maintained.

  The temporary forming step may be performed until the self-filling property of the high-fluidity concrete C is lowered, but more desirably, the free surface descent of the replenishing concrete C ′ in the storage means 2b is reduced, and at least the high-fluidity concrete. This is performed until the fluidity is lost in the surface layer portion of C. In the temporary molding process of the present embodiment, the level and shape of the top end face C1 does not change even when the lid mold 2 is removed, and the traces of the fingers remain blurry when the top end face C1 is pressed with a finger. The fluidity of the high fluidity concrete C is reduced until it reaches a state. The completion time of the temporary forming process varies depending on the composition of the high-fluidity concrete C and the ambient temperature, but in many cases, 3 to 5 hours after adding water to the powder containing cement, pozzolanic reaction particles, and aggregate. is there.

  As shown in FIGS. 1D and 1E, the replacement process is a process of covering the decorative lid 3 on the top end face C1 of the high fluidity concrete C, and the fluidity of the high fluidity concrete C is completely lost. It is done before it starts (before condensation starts). That is, in the replacement step, the lid mold 2 is removed, the top end surface C1 is leveled to remove the air avatar and the like, the decorative lid 3 is covered with the top end surface C1, and the transfer surface 3a of the decorative lid 3 is placed on the top. In this embodiment, it is a step of closely contacting the end face C1, and in this embodiment, the top end face C1 is pushed with a finger when the trace of the finger remains dimly, before the self-filling property of the high-fluidity concrete C is completely lost (condensation occurs). The replacement process is completed by (before starting). The setting of high-fluidity concrete C starts depending on the composition and ambient temperature, but it is 10-12 hours after adding water to the powder containing cement, pozzolanic reactive particles and aggregate. Before the replacement step, it is necessary to finish the replacement step. In the present embodiment, the lid element 21 is replaced with the decorative element 31 in order from the heel side of the inclined surface S. It is of course possible to cover the decorative elements 31, 31,... After removing all the lid elements 21, 21,. When replacing the cover element 21 with the decorative element 31, the sheet 4 is removed together with the cover element 21, the top end face C1 is exposed, the top end face C1 is leveled using a wooden trowel or a gold trowel, and the makeup element 31 is then removed. Overlay. After covering the decorative element 31, as shown in FIG. 1 (e), the cover element 21 is placed on the upper surface of the decorative element 31, and the weight of the cover element 21 causes the rough surface member 31b of the decorative element 31 (FIG. 3). (Refer to (a)) against the top end face C1.

  The main forming step is a step of condensing and hardening the high-fluidity concrete C in a state where the transfer surface 3a of the decorative lid 3 is in close contact with the top end surface C1. That is, in the main forming step, the setting of the high fluidity concrete C is started, and further, the high fluidity concrete C is hardened and developed until the demolding strength is reached. Curing temperature and curing time are set according to the type of high fluid concrete C and the like.

  When the high fluidity concrete C reaches the demolding strength, the mold structure 1 and the decorative lid 3 are demolded, and then secondary curing such as steam curing is performed as necessary.

  According to the method for manufacturing a concrete member according to the present embodiment described above, since the air avatar and the like generated so far can be surely removed at the stage of replacing the lid mold 2 with the decorative lid 3, the decorative lid 3 As a result, the finished state of the top end surface C1 formed by the above method becomes satisfactory, and the finishing accuracy is improved.

  That is, according to the manufacturing method according to the present embodiment, a concrete member having a high finishing accuracy and a uniform surface roughness can be obtained. Therefore, for a concrete member that requires a high finishing accuracy, such as a monorail track girder. Suitable for manufacturing.

  Further, as in the present embodiment, if the temporary forming step is performed in a state where pressure is applied to the high fluid concrete C, the entrap air contained in the high fluid concrete C is surely degassed, A dense concrete member with high dimensional accuracy can be obtained.

  Further, as in the present embodiment, when the storage means 2b is communicated with the communication port 2a of the mold structure 1, and the replenishment concrete C ′ having self-filling property is stored in the storage means 2b, the entrap air For replenishment even when the volume of the high-fluidity concrete C is reduced by deaeration or when a void is formed in the space surrounded by the mold structure 1 and the lid mold 2 from the time of placement. Since the concrete C ′ is quickly replenished into the formwork structure 1, it becomes possible to spread the high-fluidity concrete C to every corner of the space surrounded by the formwork structure 1 and the lid formwork 2. As a result, it is possible to manufacture a concrete member with high density and high dimensional accuracy.

  Moreover, according to the manufacturing method according to the present embodiment, the pressure generated due to the difference in height between the high fluid concrete C and the supplemental concrete C ′ is applied to the high fluid concrete C. The state in which C1 is in close contact with the lower surface of the lid mold frame 2 can be continued until the lid mold frame 2 is removed. As a result, the top end surface C1 can be temporarily formed into the shape of the lower surface of the lid mold frame 2. It becomes.

  In addition, according to the manufacturing method according to the present embodiment, the lid mold frame 2 is installed on the upper surface of the decorative lid 3, and the transfer surface 3a of the cosmetic lid 3 is pressed against the top end surface C1 by the weight of the lid mold frame 2. Therefore, the macroscopic shape of the temporarily formed top end surface C1 can be corrected to match the contour of the decorative surface 3a, and the fine irregularities formed on the transfer surface 3a can be reliably transferred to the top end surface C1. can do.

The configuration described above may be changed as appropriate.
For example, in the embodiment described above, the core material 31a of the decorative element 31 is a wooden plywood (see FIG. 3A), but is not limited to this, as shown in FIG. 3B. A metal plate (so-called punching metal) in which a large number of through holes 32c, 32c,... Are formed may be used as the core material 32a. In this way, the rough surface member 32b bites into the through hole 32c of the core member 32a, and a recess having a larger diameter than the fine unevenness of the rough surface member 32b is formed, so that a rough surface is formed on the top end surface C1. In addition to the fine irregularities carved by the member 32b, convex portions corresponding to the concave portions can be formed.

  In the above-described embodiment, the decorative element 31 formed by combining the core material 31a and the rough surface member 31b is illustrated (see FIG. 3A). However, as shown in FIG. The surface member 31b may be omitted. The core material 33a shown in FIG. 3 (c) is a rubber or synthetic resin plate material having relatively large recesses 33c, 33c,... Is formed. When the rough surface member 31b is omitted, the high-fluidity concrete C can be prevented from leaking by covering the ventilation holes (not shown) formed in the core material 31a with a woven or non-woven fabric that does not inhibit the ventilation. desirable.

  Moreover, although the case where the communication port 2a was formed in the lid mold 2 was illustrated in the embodiment (see FIG. 2), the present invention is not limited to this, and the communication port is formed in the bottom plate 11 of the mold structure 1 Alternatively, as shown in FIG. 4, a communication port may be formed in the side mold 12.

  Moreover, although the case where the storage means 2b was directly connected to the communication port 2a was illustrated in this embodiment (refer FIG. 2), you may connect the storage means 1b to a communication port via the opening / closing means 1c.

  The opening / closing means 1 c includes a pair of substrates 13 and 14 having holes corresponding to the communication ports provided in the side mold 12 and a partition plate 15 interposed between the substrates 13 and 14. ing. One substrate 13 is fixed to the side mold 12, and the other substrate 14 is opposed to the one substrate 13 with a gap approximately equal to the thickness of the partition plate 15. The storage means 1b is connected to the other substrate 14. The partition plate 15 is slidably inserted between the substrates 13 and 14. When the window portion 15 a is aligned with the hole portion of the substrates 13 and 14, the communication opening is opened, and the window portion 15 a is opened to the hole of the substrates 13 and 14. If it is shifted from the part, the communication port is closed.

  When using the formwork structure 1 with the opening / closing means 1c, at least as long as the replenishing concrete C ′ has a self-filling property, the communication port is kept open so that the high-fluidity concrete C is condensed. It is advisable to close the communication port before closing. If it does in this way, it can prevent that the concrete for replenishment C 'hardens | cures and unites with the high fluidity concrete C in the formwork structure 1. FIG.

  Further, in the present embodiment, the case where the reference surface 12b serving as a reference when finishing the top end surface C1 is provided on the upper surface of the flange 12a of the formwork structure 1 is illustrated (see FIG. 2). The upper surface of the reference plate 16 attached to the flange 12a may be used as the reference surface 16b. As shown in FIG. 5, the reference plate 16 is placed on spacers 17, 17,... Installed on the flange 12 a, and is fixed to the flange 12 a using bolts 18 and nuts 19. A counterbore for accommodating the head of the bolt 18 is formed on the reference surface 16b. Further, a face wood portion 16 a is formed at the edge of the reference plate 16. The face wood portion 16a is a ridge having a triangular cross section for forming a tapered surface at the edge of the top end surface C1, and is locked to the upper end edge of the side mold frame 12.

  If the reference surface 16b is provided on the reference plate 16, the curvature and gradient of the reference surface 16b can be changed only by changing at least one of the reference plate 16 and the spacer 17, so that the finished shape of the top end surface C1 is Even if it is a case where it differs for every concrete member, it becomes possible to respond easily.

(A)-(e) is typical sectional drawing for demonstrating the manufacturing method of the concrete member which concerns on embodiment. It is a perspective view showing a formwork structure and a lid formwork. (A) is a perspective view for demonstrating the structure of a makeup | decoration element, (b) And (c) is a perspective view for demonstrating the modification of a makeup | decoration element. It is a perspective view for demonstrating the modification of a formwork structure. FIG. 5 is an enlarged perspective view of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork structure 2 Lid formwork 21 Lid element 3 Decorative lid 3a Transfer surface 31 Decorative element C High-fluidity concrete C1 Top end surface C 'Supplemental concrete

Claims (6)

A temporary molding step of reducing the fluidity of the high-fluidity concrete in the mold structure covering the lid mold, and temporarily molding the top end surface of the high-fluidity concrete with the lid mold;
The lid mold is removed, the top end surface is leveled, a decorative cover having a transfer surface imitating the finished shape of the top end surface is placed over the top end surface, and the transfer surface is in close contact with the top end surface A substitution step of
A main forming step of condensing and curing the high-fluidity concrete in a state where the transfer surface is in close contact with the top end surface, and a method for producing a concrete member,
The method for producing a concrete member, wherein the replacing step is performed before the fluidity of the high-fluidity concrete is completely lost. When forming an inclined surface on the top end surface of the high fluidity concrete,
Dividing the lid formwork into a plurality of lid elements;
2. The method for manufacturing a concrete member according to claim 1, wherein after the high-fluidity concrete is placed, the lid element is covered in order from the heel side of the inclined surface. The makeup lid is divided into a plurality of makeup elements,
The method for producing a concrete member according to claim 2, wherein, in the replacing step, the lid element is replaced with the decorative element.   4. The method according to claim 1, wherein the top end surface is pressed against the lid mold by applying pressure to the high-fluidity concrete in the mold structure during the temporary forming step. 5. The method for producing a concrete member according to one item. In the formwork structure or the lid formwork, there is provided a communication port that communicates with the formwork structure, and a storage means that can store replenishment concrete having the same property as the high-fluidity concrete is connected to the communication port.
During the temporary forming step, the upper end of the replenishment concrete stored in the storage means is positioned above the top end surface of the high-fluidity concrete, and the upper end of the replenishment concrete and the top end surface of the high-fluidity concrete The method for producing a concrete member according to any one of claims 1 to 3, wherein a pressure generated due to a difference in height between the high fluidity concrete is applied to the high fluidity concrete.   The method for producing a concrete member according to claim 5, wherein the communication port is closed before the setting of the high-fluidity concrete is finished.

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