JP3648198B2 - Formwork for manufacturing concrete segments - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a formwork for manufacturing a concrete segment.
[0002]
[Prior art]
As shown in FIG. 4, a concrete segment manufacturing form 1 has a pair of arcuate circumferential side plate forms 3, 3 and a pair of linear shapes on an arcuate bottom plate 2 a of the bottom plate formwork 2. The end plate molds 4 and 4 are combined in a frame shape, and the concrete segment S is manufactured by placing concrete (striking) from above.
[0003]
[Problems to be solved by the invention]
When the side and end surfaces of the concrete segment are provided with unevenness for joining or the like, uneven portions are formed on the inner side surfaces of the circumferential side plate mold frame 3 and the end plate mold frame 4 in a complicated manner. In the case of molding, it is necessary to slide the mold, etc., which requires a lot of time and labor, and also causes a situation where the cross-sectional defect occurs and the product cannot be used.
[0004]
The present invention has been made to solve such a problem, and its object is to remove a concrete segment having complex irregularities on both side surfaces and both end surfaces by a low-cost mold with a relatively simple structure. It is to provide a formwork for manufacturing a concrete segment which can be executed in a short time by a simple operation and can manufacture a concrete segment having complicated irregularities on both side surfaces and both end surfaces without causing cross-sectional defects. .
[0005]
[Means for Solving the Problems]
The present invention, on the bottom plate of the bottom plate mold, is a formwork for manufacturing a concrete segment, which is a frame-like combination of a circumferential side plate mold frame and an end plate mold frame with irregularities formed on the inner surface ,
Free end can be deflected downward at both end portions around the point B of the end position of the base of the bottom plate is formed by supporting the central portion of the bottom plate of the bottom plate mold at the base, this Installation of the end plate mold of the free end by folding downward along a folding line parallel to the longitudinal direction of the end plate mold at the point A of the lower end position of the inner surface of the end plate mold on the tip side of the free end The deformed portion is formed in the portion to be formed, and the end plate mold frame fastened to the bottom plate is assembled to the circumferential side plate mold frame fastened to the bottom plate, and the deformed portion is elastically deformed upward to form a regular shape mold It is comprised so that may be formed, It is a formwork for manufacture of the concrete segment characterized by the above-mentioned.
[0006]
As shown in FIGS. 1 and 4, the bottom plate of the bottom plate mold and the circumferential side plate mold are arc-shaped with the same curvature. For example, the bottom plate mold is supported only at the center, and the end plate mold of the bottom plate The both ends where the is installed are free end portions that can be bent downward, a folding line is provided at an appropriate position of the free end portion, and the bent portion is bent to form a deformed portion. The deformed portion is an arc having substantially the same curvature as the bottom plate, and is inclined downward at a predetermined inclination angle with respect to the bottom plate. When the mold is assembled, the deformable portion is elastically deformed upward to form an arc-shaped mold frame bottom continuous with the bottom plate.
[0007]
In addition, as shown in FIG. 1, a position A where the lower end of the inner side surface of the end plate mold is in contact with the free end is a folding line, and the tip of the free end is a deformed portion that is bent downward. It is preferable that the deformed portion bends downward and the free end bends downward when forming the mold. In this case, the deformed portion is under the end plate formwork and does not affect the shape of the concrete segment.
[0008]
In the construction as described above, when the concrete is placed, the deformable portion is elastically deformed upward by assembling the end plate mold frame to the circumferential side plate mold frame with bolts, nuts, etc., as shown in FIG. 2 (a). As described above, the deformed portion has an arc shape that is continuous with the bottom plate, and forms a regular form. If concrete is placed in this state, a concrete segment having a regular shape is manufactured.
[0009]
Upon demolding after curing, when the circumferential side plate mold is removed, the end plate mold that has been fastened until then is released, and the deformed portion provided on the bottom plate is released by the end plate mold being released, As shown in Fig. 2 (b), it falls down by its own weight, and it is bent downward by drawing a circular orbit around the point A by the spring effect (spring back) a, and the inner surface of the end plate formwork is concrete Peel naturally from the surface. Further, as shown in FIG. 3, the free end portion of the bottom plate is further bent downward by drawing a circular orbit around the point B by the spring effect b, so that the bottom plate and the concrete segment are naturally separated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiment. FIG. 1 shows an embodiment of a concrete segment manufacturing form according to the present invention divided into right and left parts. 2 and 3 sequentially show the state at the time of demolding. FIG. 4 shows the overall configuration of the mold.
[0011]
As shown in FIG. 4, the concrete segment manufacturing form 1 includes a pair of arcuate circumferential side plate forms 3 and 3 and a pair of end plates on the arcuate bottom plate 2 a of the bottom plate formwork 2. The frames 4 and 4 are combined in a frame shape. The bottom plate 2a of the bottom plate mold 2 is supported by the support frame 5 via the base 2b. The bottom plate 2a is formed longer than the base 2b. Therefore, the free end portions 10 at both ends of the bottom plate 2a on which the end plate formwork 4 is installed can be bent downward about the point B. .
[0012]
As shown in FIG. 1, concave and convex molding protrusions 4a and convex molding grooves 4b are formed on the inner side surfaces of the left and right end plate molds 4 and 4, respectively. Concavities and convexities are formed. Similarly, protrusions and grooves are formed on the inner surfaces of the pair of circumferential side plate molds 3 and 3. In addition, the end plate mold 4 and the circumferential side plate mold 3 are provided with protruding portions for seal grooves.
[0013]
The circumferential side plate mold 3 is installed on the bottom plate 2a and fastened with bolts, nuts and the like. The end plate mold 4 is also installed on the bottom plate 2a and fastened with bolts / nuts or the like. Furthermore, the end plate mold 4 is disposed so as to be sandwiched between the pair of circumferential side plate molds 3 and 3, and is fastened to the circumferential side plate mold 3 with bolts and nuts.
[0014]
In the mold 1 having such a configuration, in the present invention, as shown in FIG. 1, the position A where the lower end of the inner surface of the end plate mold 4 abuts on the surface of the bottom plate 2a is bent so as to form a folding line. The front end portion 11 of the bottom plate 2a on which the end plate mold 4 is installed is bent downward in advance. The distal end portion, that is, the deformed portion 11 has an arc shape with substantially the same curvature as the bottom plate 2a, and is inclined downward at a predetermined inclination angle with respect to the bottom plate 2a. The inclination angle is several degrees and is determined as appropriate.
[0015]
When placing concrete, the deformable portion 11 is elastically deformed upward by assembling the end plate mold 4 to the circumferential side plate mold 3 with bolts, nuts, etc., and as shown in FIG. 11 forms an arc shape continuous with the bottom plate 2a, and becomes a form 1 having a regular shape. If concrete is cast in this state, a concrete segment S having a regular shape is manufactured.
[0016]
When the mold is removed after curing, the circumferential side plate mold 3 is removed. When the circumferential side plate formwork 3 is removed, the end plate formwork 4 that has been fastened until then is released. Thereafter, the deformed portion 11 provided on the bottom plate 2a is lowered by its own weight as shown in FIG. 2 (b) due to the release of the end plate mold 4, and by the spring effect (spring back) a. A circular trajectory is drawn around the point A and bent downward, so that the inner surface of the end plate mold 4 is naturally peeled from the concrete surface.
[0017]
Further, as shown in FIG. 3, the free end portion 10 of the bottom plate 2a bends downward in a circular orbit around the point B by the spring effect b, so that the bottom plate 2a and the concrete segment S are naturally separated. .
[0018]
When removing the mold for manufacturing the concrete segment S having a complicated unevenness, it does not require much time and labor, such as sliding the mold as in the past, and it is short and easy. The mold can be removed in time, and the concrete segment S having complicated uneven portions can be produced without causing cross-sectional defects.
[0019]
In the illustrated example, the position A is a folding line, but the present invention is not limited thereto, and a folding line may be provided between A and B or at the position B. Further, it goes without saying that the present invention can be applied not only to the formwork apparatus of the illustrated example but also to formwork apparatuses having other configurations.
[0020]
【The invention's effect】
(1) The present invention forms a deformed portion by bending a portion of the bottom plate mold frame where the end plate mold frame is installed by a fold line parallel to the longitudinal direction of the end plate mold frame to remove the mold. The deformed portion bends downward due to the weight of the end plate mold and the spring effect, the inner surface of the end plate mold naturally peels from the concrete surface, and the free end of the bottom plate further bends downward due to the spring effect. Since the bottom plate and the concrete segment are separated naturally, it is possible to perform the demolding of the concrete segment having complex irregularities on both side surfaces and both end surfaces in a short time with simple operations, and complex irregularities. Can be produced without producing cross-sectional defects.
[0021]
(2) Since the mold only needs to bend the bottom plate to form the deformed portion, it can be a low-cost mold with a relatively simple configuration. Existing formwork can also be used.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a concrete segment manufacturing form according to the present invention divided into left and right parts.
FIG. 2 is a front view of the mold shown in FIG. 1, where (a) shows an initial state at the time of demolding after placing concrete, and (b) shows a state during the demolding.
FIG. 3 is a front view showing a final state when the mold shown in FIG. 1 is removed.
4 is a perspective view showing an overall configuration of the mold shown in FIG. 1. FIG.
[Explanation of symbols]
S: Concrete segment A ... Bending curve B ... Starting point of free end 1 ... Manufacturing form 2 ... Bottom plate form 2a ... Bottom plate 2b ... Base 3 ... Circumferential side plate form 4 ... End plate type Frame 5 …… Supporting frame 10 …… Free end 11 of the bottom plate …… The tip of the bottom plate (deformed portion)

Claims (1)

On the bottom plate of the bottom plate formwork, a formwork for manufacturing a concrete segment, which is a frame-like combination of a circumferential side plate formwork and an end plate formwork with irregularities formed on the inner surface ,
Free end can be deflected downward at both end portions around the point B of the end position of the base of the bottom plate is formed by supporting the central portion of the bottom plate of the bottom plate mold at the base, this Installation of the end plate mold of the free end by folding downward along a folding line parallel to the longitudinal direction of the end plate mold at the point A of the lower end position of the inner surface of the end plate mold on the tip side of the free end The deformed portion is formed in the portion to be formed, and the end plate mold frame fastened to the bottom plate is assembled to the circumferential side plate mold frame fastened to the bottom plate, and the deformed portion is elastically deformed upward to form a regular shape mold A formwork for producing a concrete segment, characterized in that is formed.

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