JP2007050656A - Form for precast concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily release a precast concrete product from a form without removing a side frame as well as generating a chip of a corner and a crack when the precast concrete product is released from the form, and to make it possible for an ordinary operator to easily release it from the form, to attempt to decrease man-hour and to improve productivity. <P>SOLUTION: In the form 1 prepared by installing the side frame 3 on a bed 2, the upper part inner face 3a of the side frame 3 is formed into a slope the upper part of which is opened outward, and the lower inner face 3b below the upper inner face 3a is inclined by an angle larger than the opening angle θ of the upper inner face 3a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a precast concrete formwork.

  Conventionally, as a method for manufacturing a precast concrete (hereinafter also referred to as PCa) floor slab, as shown in FIG. 8, a steel side frame 102 is fastened to a steel bed (surface plate) 101 with bolts or knock pins. It is fixed with the tool 103 to form a forming mold frame, a metal fitting and a reinforcing bar are arranged in the forming mold frame, and then the ready-mixed concrete is put into the steel side frame after hardening the concrete. A method of removing the cured precast concrete floor slab 104 to be a product after removing is generally used.

  In the conventional method for producing a PCa floor slab, as described above, a steel side frame attachment process and a removal process are required, and the steel side frame is fastened with a number of bolts and knock pins. Therefore, there is a problem that man-hours for manufacturing work are large.

  Therefore, a method of removing the molded precast concrete floor slab without removing the steel side frame by simplifying the process in the conventional mold has been studied, but the inner surface of the steel side frame 102 has been studied. The corner A formed by the upper surface of the steel bed 101 is a right angle, and the cast concrete adheres to the inner surface of the steel side frame 102, so that the corner A or the like is chipped or cracked. Therefore, there is a problem that the product quality is greatly affected, and advanced technology is required for demolding. Furthermore, there is a problem that the side frame is lifted together with the concrete product during demolding, and it takes time to remove the side frame.

  Then, this invention aims at providing the formwork for precast concrete which solves the said subject.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a mold in which a side frame is installed on a bed, and the lower inner surface of the side frame is formed as an inclined surface with the upper side facing outward. It is characterized by.

  According to a second aspect of the present invention, in the mold formed by installing the side frame on the bed, the upper inner surface of the side frame is formed as an inclined surface that opens upward toward the outer side, and is located below the upper inner surface. The lower inner surface is inclined at an angle larger than the opening angle of the upper inner surface.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lower inner surface of the side frame is formed with a curved surface.

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, a vibrator is attached to the bed.

  According to the present invention, the lower inner surface of the side frame is formed as an inclined surface with the upper side facing outward, so that when the molded concrete product is demolded, the side frame is removed without being removed from the bed. Even so, it is possible to prevent the corners of the concrete product from being chipped or cracked, and even a general worker can easily remove the mold without requiring high-level or special skills.

  In addition, since it is not necessary to remove the side frame from the bed when removing the mold, there is no need to assemble or remove the side frame each time a single product is molded. Can greatly contribute to the improvement of performance.

  According to the second aspect of the present invention, it is possible to further facilitate demolding by inclining the upper inner surface of the side frame so as to open outward.

  According to the third aspect of the present invention, the lower inner surface of the side frame can be continued to the upper inner surface of the side frame and the surface of the bed without having corners, and the above chipping and cracking can be further prevented. .

  According to the fourth aspect of the present invention, when the concrete product is removed from the mold, the vibrator is driven to vibrate the formwork, thereby making it easier to remove the mold without any chipping or cracking.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described based on an embodiment shown in the drawings.

1 and 2 show a first embodiment of the present invention and are conceptual diagrams of the present invention.
In FIG. 1, a formwork 1 includes a steel bed (surface plate) 2 installed on the ground surface, a steel side frame 3 erected around the surface 2 a of the bet 2, and side surfaces of the bed 2. And a vibrator 6 attached to the.

The surface 2a of the bed 2 is formed horizontally and forms a bottom mold surface.
The side frames 3 are arranged on the front surface 2a of the bed 2 in the front-rear and left-right directions, and a rectangular molding space 5 is formed by these four side frames 3A to 3D. Each side frame 3 is fixed to the surface of the bed 2 by a fastener 4 such as a bolt or a knock pin.

  An electric vibrator 6 is attached to the side of the bed 2, and the bed 2 and the side frame 3 are vibrated by driving the vibrator 6. This vibrator 6 is provided in a desired position and a desired number, and as shown in FIG. 1, it may be provided on the front and rear side frames 3A and 3B side bets and the left and right side frame 3C and 3D side bets, respectively. One may be provided at a desired position.

  The inner surface (upper inner surface) 3a excluding the lower portion of the side frame 3 is inclined upward outward so that the angle θ formed by the upper inner surface 3a and the surface (mold surface) 2a of the bed 2 becomes an obtuse angle. It forms in the open taper surface, and it is formed so that the mutual upper inner surfaces 3a and 3a of the side frames 3 and 3 which oppose may expand as it goes up.

  Furthermore, the lower part of the inner surface of the side frame 3 is formed on a lower inner surface 3b that is opened at an angle larger than the angle θ. That is, the lower inner surface 3b of the side frame 3 is inclined from the upper inner surface 3a toward the inner side (molding space 5 side) of the side frame 3 in a curved surface or straight line and reaches the surface 2a of the bed 2. The lower inner surface 3b may be formed as a curved surface, and the upper end thereof may be continued to the upper inner surface 3a by a curved tangent, and the lower end thereof may be continued to the surface 2a of the bed 2 by a curved tangent.

  As described above, the side frame in which the upper inner surface 3a and the lower inner surface 3b are inclined may be used for all the four side frames 3A to 3D. You may use only for frames 3A and 3B. That is, you may use only for a desired side frame with the concrete plate to shape | mold.

Next, the process and operation for producing a PCa concrete plate using the mold 1 will be described.
As described above, in a state where the four side frames 3A to 3D are fixed on the bed 2, a metal fitting and a reinforcing bar are arranged in the molding space 5, and thereafter, the ready-mixed concrete 7 is placed.

  Next, after curing and hardening the placed ready-mixed concrete 7, the hardened concrete slab is lifted by a suitable means and demolded.

  At this time, since the lower inner surface 3b is formed on an inclined surface, the concrete adhesion stress at the time of demolding can be released smoothly, the demolding of the concrete plate is easy, and the inner surface of the side frame and the bed Generation of chipping or cracking of the concrete plate at the corner formed by the surface can be prevented.

  Furthermore, since the upper inner surface 3a of the side frame 3 is inclined outward as described above, it is possible to further remove the mold.

  Further, when the vibrator 6 is driven to generate vibrations in the bed and the side frame 3 at the time of the above-described mold removal, the mold removal is further facilitated and the occurrence of the above-described chipping and cracking can be prevented. .

  Therefore, skill at the time of demolding is not required, and even ordinary workers can easily demold without adverse effects.

  Furthermore, as described above, since the side frame can be removed from the bed while being fixed, the side frame assembly and removal steps are not required, and the work can be greatly reduced, greatly improving productivity. Can contribute.

  Furthermore, since special skills are not required, a wide range of production activities can be facilitated.

3 and 4 show a second embodiment.
The second embodiment shows an example of forming the lower inner surface 3b in the side frame 3 in the first embodiment.

  In the second embodiment, as shown in an enlarged view in FIG. 4, the side frame 3 is formed by a lower side frame 3c that forms the lower inner surface 3b and an upper side frame 3d that forms the upper inner surface 3a. It is integrated by welding W.

  The lower side frame 3c is formed of a steel plate placed on the surface 2a of the bed 2, and its inner end surface is a lower inner surface 3b inclined with a curved surface or a straight line as described above, and the upper side frame 3d is a steel plate. The upper portion of the lower frame 3c is erected on the lower side frame 3c.

  The lower side frame 3c is fixed to the bed 2 with a fastener 4 such as a bolt or a knock pin.

  Since the other structures in the second embodiment are the same as those in the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

  Also in the second embodiment, the same operations and effects as those of the first embodiment can be exhibited.

FIG. 5 shows a third embodiment.
The third embodiment is still another example of forming the lower inner surface 3b in the first embodiment.

  In the third embodiment, the lower side of the inclined upper inner surface 3a of the side frame 3 in the first embodiment is extended to the surface 2a of the bed 2 at the same angle, and the extended surface 3e and the surface 2a of the bed 2 are formed. A sealing material or the like is applied to the corners and solidified, and the inclined lower inner surface 3 b is formed on the inner surface of the coating material 8.

  Since the other structure is the same as that of the said Example, the same code | symbol as the above is attached | subjected to the same member as the above, and the description is abbreviate | omitted.

Also in the third embodiment, the same actions and effects as the first embodiment can be exhibited.
The lower inner surface 3b of the side frame 3 is formed by bending the lower portion of the upper side frame 3d shown in the second embodiment to the molding space 5 side and extending to the surface 2a of the bed 2, and the extension portion The lower inner surface 3b may be formed.

FIG. 6 shows a fourth embodiment.
In the fourth embodiment, the inclined upper inner surface 3a of the side frame 3 in the first and second embodiments is extended downward at the inclination angle so that the lower inner surface 3b of the side frame 3 is inclined with the upper side facing outward. Is formed.

  Since the other structure is the same as that of the said Example, the same code | symbol is attached | subjected to the same part as the above, and the description is abbreviate | omitted.

  Also in the fourth embodiment, the same actions and effects as described above can be exhibited.

FIG. 7 shows a fifth embodiment.
In the fifth embodiment, the upper inner surface 3a of the side frame 3 in each of the embodiments is formed perpendicular to the surface 2a of the bed 2.

  That is, the upper inner surface 3a of the side frame 3 is formed perpendicular to the surface 2a of the bed 2, and the lower inner surface 3b of the side frame 3 is formed in a linear inclined surface with the upper portion facing outward.

  The lower inner surface 3b in the fifth embodiment may be a curved surface as in the embodiment shown in FIGS. 2 to 4, and is formed by applying and solidifying a sealing material as shown in the embodiment in FIG. You may do it.

  Since the other structure is the same as that of the said Example, the same code | symbol is attached | subjected to the same part as the above, and the description is abbreviate | omitted.

In the fifth embodiment, the same actions and effects as described above can be exhibited.
The present invention can be applied to the production of PCa plate material, and is particularly effective for the production of PCa floor slabs.

The top view which shows Example 1 of this invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. The sectional side view of the mold which shows Example 2 of this invention. FIG. 4 is an enlarged side sectional view of a side frame portion in FIG. 3. The sectional side view of the mold which shows Example 3 of this invention. The principal part side sectional view showing Example 4 of the present invention. The principal part side sectional view showing Example 5 of the present invention. The side sectional view showing the conventional formwork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork 2 Bed 2a Bet surface 3 Side frame 3a Upper inner surface 3b Lower inner surface 4 Fastener 5 Molding space 6 Vibrator

Claims (4)

  A formwork for precast concrete, characterized in that in the formwork formed by installing a side frame on a bed, the lower inner surface of the side frame is formed as an inclined surface with the upper side facing outward.   In a mold formed by installing a side frame on a bed, the upper inner surface of the side frame is formed as an inclined surface that opens upward outward, and the lower inner surface below the upper inner surface is formed on the upper inner surface. A precast concrete formwork characterized by being inclined at an angle larger than the opening angle.   The precast concrete formwork of Claim 1 or 2 which formed the lower inner surface of the said side frame with the curved surface.   The precast concrete formwork according to claim 1 or 2, wherein a vibrator is attached to the bed.

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