JPH0620754U - Recessed Mold Formwork for Connecting PC Girder Horizontal Girders - Google Patents

Abstract

(57) [Abstract] [Purpose] A mold for forming a transverse girder connection recess of a PC girder can be reused many times and has a good finished surface. [Structure] An upward-facing U-shaped metal frame 20 that forms both side and bottom sides of a horizontal girder connection recess is fixed to the inner surface of a side surface mold plate 6 of a PC girder molding frame, and a central portion of the metal frame 20 is fixed. The wooden template 27 for molding is removably fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a horizontal girder connection concave part forming frame for simultaneously forming a horizontal girder connection concave part when molding a prestressed concrete (hereinafter referred to as PC) girder.

[0002]

[Prior art]

 In general, as shown in FIGS. 4 and 5, precast PC girders 1, 1 ... Are arranged in parallel and installed between bridge piers 2, 2, and transverse girders 3, 3 with the respective PC girths oriented in the width direction. A method is known in which PC steel materials 4 and 4 that are connected through the ... are tensioned to give a press rest in the width direction to integrate them, and they are integrated. The PC girder used in this method is known. At the same time, they were molded at the same time using a cross-linking concavity molding frame. As this conventional concave mold, a wooden mold and a steel mold are used. As shown in FIG. 6, the wooden concave mold has an inner peripheral surface of the concave mold on the inner surface of the side mold 6 for molding a PC girder. There is used one in which a square bar 7 is arranged in a frame shape at a part position, and a wooden panel 8 is arranged on the surface thereof and screwed to a template 6.

Further, as the steel product, as shown in FIG. 7, a steel mold plate 9 integrally molded in a recessed shape is welded to the inner surface of the mold plate 6 at its peripheral portion.

A sheath positioning piece 11 for fixing the PC steel material insertion case 10 by screwing in the width direction of the PC girder is screwed to each of these molds.

[0005]

[Problems to be solved by the device]

 In the conventional horizontal girder connection concave part forming form as described above, the wooden form has a problem that the number of reusable times is small and the number of manufactured pieces is large, which requires a lot of labor and cost. .

Further, in the case of steel, since the peripheral edge portion is welded to the inner surface of the template, the welded portion 12 becomes the outer surface of the product, resulting in poor finish of the product, and it takes time and effort to finish the product after forming. Moreover, if a hole is made to attach a sheath positioning piece, there is a problem that it cannot be reused as it is for molding PC girders with different sheath positioning.

The present invention has been made for the purpose of solving such a conventional problem.

[0008]

[Means for Solving the Problems]

 A feature of the present invention for solving the above-mentioned conventional problems is to provide a horizontal girder connection concave part forming frame which is mounted to project on the inner surface of the side surface template of the PC girder molding frame. An upward-facing U-shaped metal peripheral frame that molds both sides and the bottom is fixed to the inner surface of the side template, and the wooden frame for molding the central portion of the recess is removable from the peripheral frame. It has been fixed to.

[0009]

[Action]

 In the recess forming mold of the present invention, the peripheral frame forms the three sides of the recess, and since there are no welded parts, the finished product surface is improved. Since the wooden template in the peripheral frame can be removed, when changing the position of the sheath positioning piece, only the wooden template can be replaced, which can be achieved at low cost.

[0010]

【Example】

 Next, an example of implementation of the present invention will be described with reference to FIGS.

In the figure, 6 is a side mold plate of the same PC girder molding form as in the conventional example, and both side faces of the side girder connecting concave part to be molded on the inner surface of the side mold plate are formed. An upwardly U-shaped metal frame 20 integrally provided with the portions 20a and 20b and the bottom portion 20c is fixed.

A pair of horizontal rails 21 and 21 are hung in parallel between both side portions 20 a and 20 b to be integrated, and the horizontal rails 21 and 21 are attached to the surface of the template 6 by bolts 22, 22. The frame 20 is fixed to the template 6 by fixing.

The outer surface of the frame 20 is a tapered surface 23 that matches the shape of the peripheral edge of the recess. Further, stepped portions 24 having the same height are continuously formed on both sides 20a, 20b and the bottom 20c of the frame 20 on the inner side of the top in the protruding direction from the surface of the template 6. The height of the step portion 24 in the protruding direction from the bottom surface of the template 6 is the same as that of the horizontal rails 21 and 21 described above.

A mold plate stopper 25 is fitted to the step portion 24 and is fixed by bolts 26, 26. The template stopper 25 is formed in an upward U shape with a thickness that fills the recess over the entire step portion 24, and a wooden template 27 for molding the central portion of the recess is fitted inside the U shape. There is.

The wooden template 27 is fixed by pressing the peripheral taper surface 27 a of the wooden template 27 with the taper surface 25 a of the inner peripheral surface of the template retainer 25 toward the horizontal rails 21 and 21.

A sheath positioning piece 28 is screwed to the surface of the wooden template 27.

In the horizontal girder connection concave part forming mold configured as described above, the horizontal crosspieces 21 and 21 are fixed to the mold plate 6 by screwing or welding, so that the entire structure is fixed. In this case, the screwing or welding mark can be prevented from being exposed on the surface even if the entire position is slightly shifted.

When changing the position of the sheath positioning piece 28, the bolts 26, 26 ... Are removed, the template plate stopper 25 is removed, the wooden template 27 is removed, and the position of the piece 28 is changed. Return to.

Further, when the position of the piece 28 is shifted, and a new screw hole is exposed on the surface, a new wooden template can be used.

[0020]

[Effect of device]

 As described above, in the concave girder forming mold for connecting horizontal girders of the present invention, the peripheral frame and the template for the central part are separated, and the template for the central part is made of wood and is replaced with the peripheral frame. By doing so, even if the sheath fixing position is changed, this can be dealt with only by replacing the wooden template part, and the peripheral frame is a side template for molding PC girders on parts other than the product surface. Since it can be fixed, the finished product is good, and the finishing work is unnecessary, which has the effect of significantly improving economic efficiency.

[Brief description of drawings]

FIG. 1 is a front view of a recess molding frame portion for connecting horizontal girders of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is an exploded perspective view of a recessed mold for connecting horizontal girders according to the present invention.

FIG. 4 is a partial plan view showing a bridge using a conventional PC girder.

5 is a sectional view taken along line BB in FIG.

FIG. 6A is a front view showing an example of a conventional wooden form,
(B) C is a plan view of the same.

FIG. 7A is a front view showing an example of a conventional steel formwork,
(B) is a plan view of the same.

[Explanation of symbols]

 6 Side Template 20 Metal Frame 20a, 20b Side Side 20c Bottom Side 21 Side Rail 22, 26 Bolt 23, 25a, 27a Tapered Surface 24 Stepped Section 25 Mold Plate Clasp 26 Bolt 27 Wooden Template 27a Tapered Surface 28 Pieces

Claims (1)

[Scope of utility model registration request] 1. A concave girder forming frame for connecting horizontal girders, which is mounted so as to project from an inner surface of a side face plate of a PC girder forming form,
An upward-facing U-shaped metal peripheral frame for molding both sides and a bottom of the transverse beam connecting recess is fixed to the inner surface of the side template, and the peripheral frame is used for forming a central part of the recess. A recessed mold for connecting girders of PC girders, characterized in that the mold is detachably fixed.