JP2007296799A - Manufacturing device for precast concrete member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity by reducing manpower work during a molding cycle while molding a precast concrete member in a small space. <P>SOLUTION: A manufacturing device for a precast concrete member is provided with a surface plate 11 for executing molding work of a PCa panel 1, upper/lower frames 12 installed on the surface plate 11 almost in parallel, a pair of side frames 13 installed apart at an interval in a length direction of the upper/lower frames 12 almost in parallel, a lifting bar 14 hung over at least either of between the upper/lower frames 12 and between the side frames 13, a pair of coupling means 15 provided to the lifting bar 14 and between the upper/lower frames 12 or between the side frames 13 so as to vertically and relatively movably engage them with each other, and an elevating/lowering means 16 for elevating/lowering the upper/lower frames 12 or the side frames 13 via the lifting bar 14. Each coupling means 15 is provided with a cam mechanism 17 for moving the upper/lower frames 12 or the side frames 13 in a direction of bringing the upper/lower frames 12 or the side frames 13 close to each other or separating them from each other along with the vertical movement of the lifting bar 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for converting a building member such as a concrete wall or slab used in a concrete building or a column or a beam into a precast concrete member using a formwork, and in particular, for forming the precast concrete member. The present invention relates to a manufacturing apparatus used.

  As one of the methods for constructing a concrete building, concrete walls, slabs, columns, beams, etc. are made into members, and these building members are made into precast concrete members using a formwork, and these precast concrete members are made. A method for assembling the building at the construction site has been proposed.

  On the other hand, in order to manufacture the precast concrete member, for example, four molds are assembled in a rectangular shape on a platen, and a reinforcing member such as a reinforcing bar is installed in the frame, and then concrete is placed. A method is generally used in which the formwork is removed after the cast concrete is solidified to obtain a precast concrete member.

When a large number of precast concrete members are manufactured by such a manufacturing method, a large number of the above-mentioned molds are prepared, and these molds are placed side by side on a surface plate, and concrete is placed individually on the molds. The method is taken.
However, such a manufacturing method has a problem that a large space is required.

  As a method that can cope with such a problem, after molding one precast concrete member, the mold is moved upward, and the mold is assembled above the precast concrete member as a support, A technique has been proposed in which concrete is cast in a formwork so that precast concrete members are sequentially laminated (see Patent Document 1).

  In this technique, in order to allow the mold to be raised and lowered, guide pillars are erected at the four corners surrounding the precast concrete member to be molded, the lift members are attached to the guide pillars, and the mold is attached to the lift member. In order to remove the mold, each mold and the lifting member are connected to each other by pins so that they can swing in the horizontal direction.

  In this technique, the precast concrete member of the first layer is formed by the assembled formwork, and then, after releasing the connection of the formwork, the formwork is connected via a pin that is a connecting portion with the elevating member. The mold is removed by swinging, and the removed mold is raised to a predetermined position together with the elevating member with the guide column as a guide, and then assembled again, and then a second layer precast concrete member is formed. By repeating the process, the precast concrete members are molded while being stacked in a multilayer shape.

JP 54-15929 A

The present applicant intends to solve the following problems remaining in the technique described in Patent Document 1 described above.
The molding cycle in the above technique is configured by performing demolding after hardening of the cast concrete, and then moving the demolded mold upward to assemble it.
Here, at the time of demolding, it is necessary to separate the formwork from the molded precast concrete member, and after demolding, these molds are used to raise the demolded formwork. It is necessary to raise and lower the plurality of lifting members to which the frame is attached at the same time.Furthermore, when reassembling the formwork, in the raised position, the fixing work must be performed with each formwork being swayed and positioned Need to do.
That is, many manual operations are required in all steps of the molding cycle, and the operations are extremely complicated.

The present invention has been made in order to solve the above-mentioned problems, and the precast concrete member manufacturing apparatus according to claim 1 is installed on a surface plate for forming the precast concrete member, and substantially parallel to the surface plate. The upper and lower frames, a pair of side frames that are installed substantially parallel to each other in the length direction of the upper and lower frames, and a lifting bar that is spanned between at least one of the upper and lower frames or between the side frames. A pair of connecting means provided between the lifting bar and the upper and lower frames or between the side frames and engaged with each other so as to be relatively movable up and down; and the upper and lower frames or the side frame are moved up and down via the lifting bar. Each of the connecting means is provided with a cam mechanism for moving the upper and lower frames or the side frames toward and away from each other as the lifting bar moves up and down. And wherein the are.
According to a second aspect of the present invention, there is provided the precast concrete member manufacturing apparatus according to the first aspect, wherein each cam mechanism according to the first aspect is attached to the upper and lower frames or the side frames, and the cam grooves are inclined with respect to the vertical direction. And a guide pin attached to the lifting bar and slidably engaged with the cam groove.
In the precast concrete member manufacturing apparatus according to claim 3 of the present invention, the cam grooves provided in the two cam mechanisms according to claim 1 are inclined in a direction of gradually separating as they go downward. It is characterized by that.
In the precast concrete member manufacturing apparatus according to claim 4 of the present invention, the cam grooves provided in the both cam mechanisms according to claim 1 are inclined in a direction of gradually separating as they go upward. It is characterized by that.
In the precast concrete member manufacturing apparatus according to claim 5 of the present invention, the lifting bar according to claim 1 is stretched between both the upper and lower frames and between the side frames, and the lifting bar and the The connecting means provided with the cam mechanism is provided between the upper and lower frames and between the side frames.
The apparatus for producing a precast concrete member according to claim 6 of the present invention is characterized in that the surface plate according to claim 1 is provided with a lifting mechanism for moving the lifting bar up and down.
In the precast concrete member manufacturing apparatus according to claim 7 of the present invention, the surface plate according to claim 6 is provided with a traveling mechanism for moving the elevating mechanism two-dimensionally in the horizontal direction. It is characterized by.
The manufacturing method of the precast concrete member according to claim 8 of the present invention uses the precast concrete member manufacturing apparatus according to any one of claims 1 to 7 to frame the upper and lower frames and the side frames, and Concrete is cast in the frame to form a first precast concrete member, and then the upper and lower frames and the side frames are released from the mold after releasing the upper and lower frames and the side frames, and then demolded. Above the first precast concrete member, the upper and lower frames and the side frames are framed using the first precast concrete member as a support, and then concrete is placed in these frames to form a second precast concrete. By forming the member and repeating these operations, the precast concrete member is sequentially laminated. Characterized in that it.
The method for producing a precast concrete member according to claim 9 of the present invention uses the precast concrete member production apparatus according to any one of claims 1 to 7 to frame the upper and lower frames and the side frames, and Concrete is cast in the frame to form a first precast concrete member, and then the upper and lower frames and the side frames are released from the mold after releasing the upper and lower frames and the side frames, and then demolded. After these frames are moved to the side of the first precast concrete member and framed on a surface plate, concrete is placed in these frames to form a second precast concrete member adjacent to it, Next, the frame is removed from the second precast concrete member, and the first precast concrete member that has already been molded is removed. On the other hand, after the first precast concrete member is framed as a support, concrete is placed in the frame to form a third precast concrete member, and these operations are repeated, The precast concrete members are sequentially formed in a laminated state at a plurality of positions adjacent to each other.

  According to the precast concrete member manufacturing apparatus according to claim 1 of the present invention, a plurality of molds are temporarily assembled in a loose state with each other, and then these molds are lifted via a lifting bar. Moves above a predetermined position.

Next, the molds are lowered together with the lifting bars, the molds are lowered onto the surface plate, and the lifting bars are further lowered until they come into contact with the molds.
At this time, since the mold frame is in contact with the surface plate, the lifting bar is further moved downward to move the lifting bar relative to the mold frame. The upper and lower frames or the side frames are engaged with each other through the connecting means by the action of a cam mechanism provided in the connecting means that makes a relative movement engagement between the lifting bar and the lifting bar. They are moved in the direction in which they approach each other.

After finely adjusting the distance between the upper and lower frames or the side frames brought close in this way, the upper and lower frames and the side frames are fixed to each other and the mold is assembled.
When assembling such a formwork, the relative positions of at least a pair of upper and lower frames or side frames are automatically and roughly adjusted by the link mechanism by the lifting operation of the lifting bar and the formwork, and set by fine adjustment later. The adjusted positional relationship is adjusted.
Therefore, the manual work in assembling the mold is greatly reduced, and the work can be simplified.

When the work for assembling the formwork is completed, a predetermined bar arrangement is made in the assembled formwork, and then concrete is placed in the formwork.
Next, after a predetermined strength is developed in the cast concrete, a mold removal operation for removing the mold is performed, and the molding of the first precast concrete member is completed.

The demolding operation is performed by lifting the lifting bar after loosening the upper and lower frames and the side frames.
That is, if the lifting bars are lifted in a state where the fixing of the frames is loosened, each frame is in close contact with the placed concrete and the movement is restrained. It is moved relative.
By such relative movement, the upper and lower frames or the side frames are forcibly moved in a direction away from each other by the action of the cam mechanism provided in the connecting means that engages the frame and the lifting bar. Separated from hardened concrete.

  As a result, when the lifting bar is further raised, the upper and lower frames and the side frame are moved together upward, but one of the upper and lower frames or the side frame is separated from the concrete as described above. As a result, the other frame is easily separated from the concrete by opening the restraining force to the other frame.

  Therefore, since all molds can be separated from the concrete by the lifting operation of the lifting bar, the mold removal operation can be performed with a simple operation.

  Then, the ascending operation accompanying the demolding operation is continued, and the entire mold is moved to a position higher than the first-layer precast concrete member, and if necessary, the upper surface of the first-layer precast concrete member is A plate that is slightly wider than the precast concrete member is laid, then the lifting bar is lowered to lower the formwork onto the plate, and the lifting bar is further lowered so that the upper and lower frames are separated by the action of the cam mechanism. Alternatively, the side frames are moved in a direction approaching each other, and these are positioned at a rough relative position.

Thus, the mold set for forming the second layer precast concrete member on the first layer precast concrete member is completed by finely adjusting and fixing the position of each mold.
Thereafter, by repeating the above-described operation, a plurality of precast concrete members can be sequentially formed in a laminated state.

  As described above, in the present invention, the mold can be roughly positioned by the lifting bar lowering operation, and the mold can be removed by the lifting bar lifting operation, thereby greatly reducing the manual work. can do.

  According to a second aspect of the present invention, the cam mechanism is attached to an upper or lower frame or a side frame, and a cam plate having a cam groove inclined with respect to a vertical direction is attached to the lifting bar. And a guide pin slidably engaged with the groove.

  With this configuration, by raising the lifting bar, the guide pin attached to the lifting bar is raised along the vertical direction, but the cam groove with which the guide pin is engaged is vertical. By being inclined with respect to the direction, the cam plate is moved in the horizontal direction as the guide pin is raised, and the upper and lower frames or side frames to which the cam plate is attached are mutually connected. It can be moved smoothly in the direction of separation.

  The cam mechanism can be a member having a small number of cam plates having cam grooves and guide pins engaged with the cam grooves, and the above-described operation can be realized with a simple configuration. Since it is only sliding with the cam groove, there are few movable parts, and therefore stable operation can be maintained over a long period of time.

As described in claim 3, the upper and lower frames or the side frames are tilted in a direction of gradually separating the cam grooves as they go upward, with the upper portion and the precast concrete member as the center. Then, the lower end can be removed from the precast concrete member by rotating it.
In addition, as described in claim 4, the upper and lower frames or the side frames are tilted in a direction of gradually separating the cam grooves as they go downward so that a contact portion between the lower portion thereof and the precast concrete member is provided. It can be demolded by turning the upper end portion away from the precast concrete member with the center as the center.

  Therefore, by selectively using these, it is possible to select a demolding method that matches the shape of the precast concrete member to be molded.

  As described in claim 5, by temporarily connecting the lifting bar to both the upper and lower frames and the side frame and providing connecting means each having a cam mechanism, temporary assembly and demolding of all the molds The operation can be performed by raising and lowering the lifting bar, and labor saving can be further improved.

  As described in claim 6, provision of an elevating mechanism for moving the lifting bar up and down on the surface plate makes it easier to temporarily assemble and remove the mold.

As described in claim 7, by providing a traveling mechanism for moving the elevating mechanism two-dimensionally in the horizontal direction, the frame position relative to the surface plate can be adjusted, and when a wide surface plate is used. While the formwork is moved between two adjacent locations on the surface plate, the precast concrete members can be formed so as to be stacked at each location.
Thereby, it is possible to form at two positions by one mold and increase productivity.

  In addition, when a predetermined strength is developed in the precast concrete member formed in one adjacent region, by moving the formwork to the other region adjacent to the mold removed from the precast concrete member, During the curing period of the precast concrete member molded in the one area, reinforcement and concrete placement, etc. can be performed in the other area, and the next precast concrete member can be molded. By superimposing molding operations, the molding cycle can be shortened and productivity can be increased.

  Furthermore, according to the method for producing a precast concrete member according to claim 8 and claim 9, the precast concrete member production apparatus according to any one of claims 1 to 7 can be effectively operated to enable efficient production. To do.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a precast concrete panel 1 (hereinafter abbreviated as a PCa panel), which is one of the precast concrete members formed according to the present invention, and a construction method of the PCa panel 1.

This PCa panel 1 is formed in a substantially flat plate shape, and a reinforcing bar (not shown) is embedded inside, and a connecting reinforcing bar 2 for connecting the upper and lower PCa panels 1 is embedded in the vertical direction. The upper end portion of the connection reinforcing bar 2 is projected upward from the upper end of the PCa panel 1.
Further, a joint sleeve 3 embedded in the PCa panel 1 so as to open at the lower end portion is attached to the lower end portion of the connection reinforcing bar 2.

  The PCa panel 1 is installed in the vertical direction and the horizontal direction in substantially the same vertical plane, and in the vertical direction, the upper end portion of the connecting rebar 2 protruding from the upper end of the PCa panel 1 positioned below is disposed upward. After being inserted into the joint sleeve 3 of the PCa panel 1 disposed in the joint sleeve 3, the joint sleeve 3 is connected by filling and solidifying the mortar. The cotter bars 4 are formed and welded to each other and then connected to each other by placing and hardening the concrete in the cotter grooves.

  Below, the 1st Embodiment of this invention applied to shaping | molding of the PCa panel 1 mentioned above is described.

  In FIG. 2, reference numeral 10 denotes a precast concrete member (PCa panel 1) manufacturing apparatus (abbreviated as a PCa manufacturing apparatus) according to the present embodiment. A pair of side frames 13 that are installed substantially in parallel with an interval in the length direction of the upper and lower frames 12; A lifting bar 14 that spans between at least one of the upper and lower frames 12 or the side frame 13, and is provided between the lifting bar 14 and the upper and lower frames 12 or between the side frames 13 so as to be relatively movable up and down. A pair of connecting means 15 to be joined together, and an elevating means 16 for raising and lowering the upper and lower frame 12 or the side frame 13 via the lifting bar 14, Hike accompanied connexion to vertical movement of the bar 14, a cam mechanism 17 for moving is a schematic configuration provided the top and bottom frames 12 or the side frame 13 in a direction toward and away from each other.

  Subsequently, these details will be described. In the present embodiment, the lifting bar 14 is spanned between the upper and lower frames 12 and is spaced at six positions in the longitudinal direction of the upper and lower frames 12. As shown in detail in FIG. 3, the connecting means 15 is provided at the overlapping portion between the both ends of each lifting bar 14 and the upper and lower frames 12.

  As shown in FIGS. 4 and 5, the cam mechanism 17 provided in each connecting means 15 is attached to the upper and lower frames 12 and includes a cam plate 19 having cam grooves 18 inclined with respect to the vertical direction. And a guide pin 20 attached to the lifting bar 14 and slidably engaged with the cam groove 18.

In the present embodiment, a pair of cam plates 19 are provided in parallel in the length direction of the upper and lower frames 12, and the cam grooves 18 are formed in each of the cam plates 19. The guide pin 20 is provided so as to penetrate the cam groove 18.
Further, at both ends of the guide pin 20, a retaining ring 21 that is brought into contact with the outer surface of the cam plate 19 and is prevented from being detached from the cam plate 19 is detachably provided. .

  Further, the cam grooves 18 are formed so that the cam grooves 18 positioned at both ends of the lifting bar 14 gradually move upward as seen from the length direction of the upper and lower frames 12 as shown in FIG. It is inclined with respect to the vertical direction so as to approach.

  The side frame 13 is superimposed on the upper surface of the upper and lower frame 12 at both ends thereof, and these overlapping portions are connected by fastening means 22 such as bolts and nuts as shown in FIG. By loosening the fastening means 22, the upper and lower frames 12 and the side frames 13 can be moved relative to each other within a predetermined range while maintaining the engaged state, and are fastened together by fastening the fastening means 22. It has become so.

  As shown in FIGS. 2 and 3, guide pillars 23 fixed to the surface plate 11 are erected in the vicinity of both ends in the length direction of the upper and lower frames 12, respectively.

  These guide pillars 23 are made of H-shaped steel in this embodiment, and engaging pieces 24 attached to the upper and lower frames 12 are engaged with the flange portions 23a so as to be relatively movable. Due to the relatively movable engagement between the engagement piece 24 and the guide column 23, the upper and lower frame 12 is moved up and down in a state where the horizontal movement distance is limited.

In the present embodiment, the flange 23 a of each guide pillar 23 has a plurality of through holes 23 b along the direction intersecting the upper and lower frames 12 at intervals in the height direction of the guide pillar 23. Is formed.
A locking pin (not shown) is detachably inserted into the through holes 23b, and the upper and lower frames 12 are engaged with the locking pins inserted into the through holes 23b. The upper and lower frames 12 and the side frames 13 attached to the upper and lower frames 12 are locked at a predetermined height.

  Therefore, the mold frames 12 and 13 can be temporarily fixed for each thickness of the PCa panel 1 by making the vertical interval of the through hole 23b correspond to the thickness of the PCa panel 1 to be molded. Yes.

  On the other hand, one of the pair of upper and lower frames 12 has the connection reinforcing bar 2 positioned so as to protrude from the upper end portion of the PCa panel 1 or the hanging metal fitting 25 as shown in FIGS. A plurality of grooves 26 penetrating toward the outside of the upper and lower frames 12 are provided at intervals in the length direction of the upper and lower frames 12, and these grooves 26 are formed in the upper and lower frames after the PCa panel 1 is formed. When raising 12, the upper and lower frames 12 are opened downward so as not to hinder the raising of the upper and lower frames 12.

  Next, a method for manufacturing the PCa panel 1 using the PCa manufacturing apparatus 10 according to this embodiment configured as described above will be described.

First, the fastening means 22 is loosened so that the upper and lower frames 12 and the side frames 13 are connected to each other so that they can be moved slightly, and these are placed on the surface plate 11.
In the process of placing the formwork, after the upper and lower frames 12 and 13 come into contact with the surface plate 11 in advance, the lifting bar 14 is further lowered so as to approach the upper and lower frames 12. However, as the lifting bar 14 descends with respect to the upper and lower frames 12, the upper and lower frames 12 are moved relative to each other by the action of the cam mechanism 17 provided between them. Roughly positioned with respect to a predetermined position.

From this, after performing fine adjustment of the positions of the upper and lower frames 12 and the side frames 13 on the classic 11, these are fixed by the fastening means 22 to form a mold, and then in the mold, As shown in FIGS. 3 and 4, predetermined reinforcing bars 27, connection reinforcing bars 2, joint sleeves 3, and the like are disposed.
At this time, as shown in FIG. 4, the connecting rebar 2 penetrates the groove 26 formed in the upper and lower frame 12, such as a reinforcing bar that must be protruded from the upper surface of the PCa panel 1 to be molded. Projecting to the outside of the upper and lower frame 12.

  Next, as shown in FIG. 6, concrete C is placed in the mold, and curing is performed until a predetermined strength is developed in the concrete C, and the process proceeds to the next demolding operation.

In order to perform the demolding operation, first, the fastening means 22 that fixes the upper and lower frames 12 and the side frames 13 are loosened to release these fastening states.
Here, the fastening means 22 is loosened to such an extent that the fixing of the upper and lower frames 12 and the side frames 13 is released, and these engaged states are maintained in the loosened state.

  From this, the lifting bar 14 is lifted to perform the demolding operation. In this embodiment, prior to this operation, first, the both side frames 13 released from the fixing to the upper and lower frames 12 are directed outward. After lifting and peeling them from the concrete C inside, the lifting operation of the lifting bar 14 is started.

  In the initial stage of the lifting operation of the lifting bars 14, the upper and lower frames 12 connected to the lifting bars 14 through the connecting means 15 are connected to the surface plate by the adhesion force of the concrete C and the white weight thereof. 11, but when the lifting bar 14 is further raised, a relative movement in the vertical direction occurs between the lifting bar 14 and the upper and lower frame 12.

When such relative movement in the vertical direction occurs, the guide pin 20 attached to the lifting bar 14 is moved upward in the vertical direction. The cam of the cam plate 19 in which the guide pin 20 is inserted Since the groove 18 is inclined so that the upper end portion thereof is inside the mold with respect to the vertical direction, the cam plate 19 moves to the outside of the mold with the movement of the guide pin 20 described above. Pressed toward the direction (ie, away from the concrete C).
Accordingly, the upper and lower frames 12 to which the cam plate 19 is attached are forcibly rotated so that the upper ends are separated from each other with the lower end as the center as shown in FIG. In addition, the upper and lower frames 12 are separated from the concrete C.

When the lifting bar 14 is further raised, both the upper and lower frames 12 and the both side frames 13 constituting the mold are already cut off from the concrete C, and the upper and lower frames of the connecting rebar 2 and the hanging bracket 25 are Since the groove 26 which is a penetrating portion of the frame 12 is opened downward, the upper and lower frames 12 and the both side frames 13 are separated from the concrete C as the lifting bar 14 is raised, and the connecting rebar 2 And the hanging metal fitting 25 come out below the upper and lower frames 12.
As a result, as shown in FIG. 8, the upper and lower frames 12 and both side frames 13 are moved above the concrete C to complete the demolding operation, and the first-layer PCa panel 1 is placed on the surface plate 11. Molded.

  Thus, in the present embodiment, the upper and lower frames 12 and the concrete C are edged by the lifting operation of the lifting bar 14, and the upper and lower frames 12 and the upper and lower frames are continuous with the edge cutting operation. Since the side frame 13 connected to 12 can be raised, the demolding operation can be easily performed.

  Next, in the present embodiment, as shown in FIG. 8, the upper surface of the first-layer PCa panel 1 formed as described above has a certain degree of hardness that is slightly wider than the upper surface of the PCa panel 1. As shown in FIG. 9, the upper and lower frames 12 and the both side frames 13 are placed on the plate 28 and the lifting bar 14 is lowered to the lowest position.

  Thus, after finely adjusting the position of the upper and lower frames 12 and positioning the side frames 13, the upper and lower frames 12 and 13 are fixed by the fastening means 22.

  Further, as shown in FIG. 10, the connection reinforcing bars 2 and the reinforcing reinforcing bars 27 are arranged inside the fixed upper and lower frames 12 and both side frames 13, and then fixed as shown in FIG. Concrete C is placed inside both the upper and lower frames 12 and both side frames 13, and after the concrete C is hardened, the lifting bar 14 is raised to remove the both upper and lower frames 12 and both side frames 13. The PCa panel 1 of the layer is formed.

By repeating the above operations, the PCa panels 1 can be sequentially formed in a laminated state.
In such a molding operation, the upper and lower frames 12 and the side frames 13 constituting the mold can be roughly positioned and removed by the lowering and raising operations of the lifting bar 14, and the manual operation is possible. Since the position of the upper and lower frames 12 can be finely adjusted, and the operation of fixing the upper and lower frames 12 and the side frames 13 by the fastening means 22 can be summarized into a simple operation, the entire molding operation can be simplified. can do.

  In the present embodiment, the up and down movement of the upper and lower frame 12 is guided by the engagement between the engagement piece 24 attached to the upper and lower frame 12 and the flange portion 23 a of the guide column 23. Therefore, the horizontal displacement of the upper and lower frames 12 and the side frames 13 can be minimized during the demolding operation by ascending or the frame operation by descending. To make it easier.

  On the other hand, a crane is used as the lifting / lowering means 16 for raising and lowering the lifting bar 14 described above. As other means, as shown in FIG. 12, it is erected on the surface plate 11. A traveling device 29 that moves two-dimensionally using the guide column 23 is installed, and an elevating mechanism 30 is attached to the traveling device 29, and the lifting bar 14 is moved up and down by the elevating mechanism 30. It is also possible to do.

  Further, if a molding area can be secured, a plurality of the molding areas are secured adjacent to each other, and the first PCa panel 1 is molded in one molding area A as shown in FIG. Then, after releasing the fixing of the upper and lower frames 12 and the side frames 13, the upper and lower frames 12 and the side frames 13 are removed while being lifted, and then the PCa manufacturing apparatus 10 is moved to another adjacent molding region B. In addition, the concrete is cast into the molds and the second PCa panel is formed adjacent thereto, and the mold is removed from the second PCa panel. The apparatus 10 is returned to the upper side of the first PCa panel which has already been formed, and after the first PCa panel 1 is framed as a support, concrete is placed in the frame and a third PCa panel is formed. Molding the Le, by repeating these operations, it can be molded in a sequentially stacked state PCa panel alternately at a plurality of locations adjacent on the platen 11.

Thereby, it is possible to form at two positions by a set of molds, and to increase productivity.
In addition, when a predetermined strength is developed in the PCa panel formed in the adjacent one region A, the mold form removed from the PCa panel is moved to the other adjacent region B to form a frame. During the curing period of the PCa panel molded in the area A, the next PCa panel can be molded by placing reinforcement or placing concrete in the other area B. Productivity can be increased by superimposing.

Note that the shape and the like of each component shown in the above-described embodiment are merely examples, and various changes can be made based on design requirements and the like.
For example, the cam grooves 18 provided in the both cam mechanisms 17 are inclined in the direction of gradually separating upward, and the lifting bar 14 is disposed between the upper and lower frames 12 and the side frames 13. The connecting means 15 provided with the cam mechanism 17 may be provided between the lifting bar 14 and the upper and lower frames 12 and between the side frames 13.

It is a front view which shows the shape and construction method of the PCa panel which is the precast concrete member shape | molded by the 1st Embodiment of this invention. 1 is an external perspective view showing a first embodiment of the present invention. It is an enlarged plan view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. FIG. 1 is a perspective view showing an external appearance of a connecting means according to the first embodiment of the present invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is an expanded vertical cross-sectional side view of the principal part which shows the 1st Embodiment of this invention. It is a side view which shows other embodiment of this invention. It is a front view which shows other embodiment of this invention.

Explanation of symbols

1 PCa panel (precast concrete panel)
2 Reinforcing bars 3 Joint sleeves 4 Cotter bars 10 Precast concrete panel manufacturing equipment (PCa manufacturing equipment)
DESCRIPTION OF SYMBOLS 11 Surface plate 12 Upper and lower frame 13 Side frame 14 Lifting bar 15 Connection means 16 Lifting means 17 Cam mechanism 18 Cam groove 19 Cam plate 20 Guide pin 21 Retaining ring 22 Fastening means 23 Guide pillar 23a Flange part 23b Through-hole 24 Engagement piece 25 Lifting Bracket 26 Groove 27 Reinforcing Bar 28 Plate 29 Traveling Device 30 Elevating Mechanism C Concrete

Claims (9)

A surface plate for forming a precast concrete member, upper and lower frames installed substantially parallel on the surface plate, and a pair of side frames installed approximately parallel to each other in the length direction of the upper and lower frames A lifting bar that spans between at least one of the upper and lower frames or between the side frames, and between the lifting bar and the upper and lower frames or between the side frames, and engages them so that they can be moved relative to each other. A pair of connecting means; and an elevating means for raising and lowering the upper and lower frames or the side frame via the lifting bar, and the upper and lower frames or the side frame are attached to each connecting means as the lifting bar moves up and down. An apparatus for producing a precast concrete member, characterized in that a cam mechanism is provided for moving in directions toward and away from each other. Each cam mechanism is attached to the upper and lower frames or the side frame, and includes a cam plate provided with a cam groove inclined with respect to a vertical direction, and is attached to the lifting bar and slidably engaged with the cam groove. 2. The precast concrete member manufacturing apparatus according to claim 1, wherein the precast concrete member manufacturing apparatus comprises: 2. The precast concrete member manufacturing apparatus according to claim 1, wherein the cam grooves provided in the two cam mechanisms are inclined in a direction of gradually separating from each other as going downward. 2. The precast concrete member manufacturing apparatus according to claim 1, wherein the cam grooves provided in the both cam mechanisms are inclined in a direction of gradually separating toward the upper side. The lifting bar is spanned between both the upper and lower frames and between the side frames, and connecting means provided with the cam mechanism is provided between the lifting bar and the upper and lower frames and the side frame. 2. The precast concrete member manufacturing apparatus according to claim 1, wherein: 2. The precast concrete member manufacturing apparatus according to claim 1, wherein a lifting mechanism for moving the lifting bar up and down is installed on the surface plate. 7. The precast concrete member manufacturing apparatus according to claim 6, wherein the surface plate is provided with a traveling mechanism that moves the elevating mechanism two-dimensionally in the horizontal direction. Using the precast concrete member manufacturing apparatus according to any one of claims 1 to 7, the upper and lower frames and side frames are framed, and concrete is placed in these frames to form a first precast concrete member. Then, after releasing the fixation of the upper and lower frames and the side frames, the upper and lower frames and the side frames are removed while being lifted, and then the first precast concrete is disposed above the first precast concrete member. The upper and lower frames and the side frames are framed using the member as a support, and then a second precast concrete member is formed by placing concrete in these frames, and repeating these operations, the precast concrete member Are sequentially formed into a laminated state. Using the precast concrete member manufacturing apparatus according to any one of claims 1 to 7, the upper and lower frames and side frames are framed, and concrete is placed in these frames to form a first precast concrete member. Then, after releasing the fixing of the upper and lower frames and the side frames, the upper and lower frames and the side frames are removed while being raised, and then these frames are moved to the side portions of the first precast concrete member. After framed on the surface plate, concrete is placed in these frames to form a second precast concrete member adjacent to it, and then the frame is removed from the second precast concrete member. Above the first precast concrete member that has already been molded, after framing the first precast concrete member as a support, Concrete is placed in the frame of the third to form a third precast concrete member, and by repeating these operations, the precast concrete member is alternately laminated in a plurality of adjacent locations on the surface plate. The manufacturing method of the precast concrete member characterized by the above-mentioned.

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