JPH06136878A - Manufacture of partial pc beam - Google Patents

Abstract

PURPOSE:To eliminate the need for brushing finish treatment in the recessed section of a connecting section with a slab by preventing the honeycomb of the section of the lug of a partial PC beam when the partial PC beam in a building such as reinforced concrete is manufactured. CONSTITUTION:Upper end reinforcements 2 and lower end reinforcements 3 are arranged upside down while throw forms 12 for forming a recessed section connected to a slab are built and fixed to a stirrup 4 and a reinforced cage 1a is assembled previously, and stepped sections 11 for forming the upper end faces of the section of the lug of a PC beam are shaped to the lower section of the side walls of the forms 19. A spacer 14 is laid on the base of these forms, the reinforced cage 1a is dropped into the forms 19 under the state, in which the reinforced cage 1a is positioned upside down, a throw form fixing material 15 is interposed in a clearance between the stirrup on the base side of the forms and the throw forms, and concrete is placed, cured and mold-released, thus forming a partial PC beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a partial PC beam in a building such as reinforced concrete.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a partial PC (precast concrete) beam, as shown in FIG.
The main bars such as the upper end bar 2 and the lower end bar 3 are arranged, surrounded by a stirrup 4 and arranged at equal intervals, and the main bar and the stirrup 4 are bound by a number line to assemble the reinforcing bar basket 1. Then, as shown in FIG. 3B, the previously assembled rebar cage 1 is dropped into the steel form 5. Reference numeral 6 is a spacer for ensuring the cover thickness, and is specifically a dice or plastic spacer.

Then, as shown in FIG. 3B, concrete is placed in the steel form 5, and is placed until the horizontal position of the lower end surface of the horizontally-installed wood mouth 7 is reached. Then, after curing for a predetermined period, concrete is further placed on the ears 8 of the PC beam. After the concrete thus cast has a predetermined strength, the concrete is removed from the steel form 5 and the result is shown in FIG.
The partial PC beam 9 shown in is completed.

[0004]

However, in the method of manufacturing the partial PC beam 9 described above, the ear portion 8 has a narrow space for placing, and the concrete filling property is poor. The so-called junkers, which are agglomerated and exposed, are likely to occur, and the brushing process of the recesses 10 to be combined with the slab is a work in which the hands are inserted through the gaps between the stir wraps 4 arranged at equal intervals. It had the drawback of being very difficult and time consuming.

The present invention has been made in view of the above problems, and prevents the partial PC beam from being junkered at the ears of the partial PC beam, thereby eliminating the need for brushing in the concave portion of the joint with the slab. It aims at providing the manufacturing method of.

[0006]

The gist of the present invention for solving the above-mentioned problems and achieving the above-mentioned object is to make the arrangement of the upper end streak and the lower end streak upside down and to form a concave portion to be joined with the slab. A discard formwork for erection on the stirrup
The reinforcing bar cage is fixed and assembled, the step for forming the upper end surface of the ear portion of the PC beam is formed in the lower part of the side wall of the formwork, and the spacer is laid on the bottom surface of the formwork. Drop the basket inside the formwork in an upside-down state, interpose a discard formwork fixing material that prevents deformation of the discard formwork in the gap between the stirrup on the bottom side of the formwork and the discard formwork, Then, it consists in pouring concrete and curing it, and then demolding it.

[0007]

According to the method of manufacturing a partial PC beam of the present invention, the partial PC beam is manufactured by turning it upside down, so that the ears of the PC beam are located in a lower position in the formwork, and the filling property of concrete is improved. Get better. Further, since the horizontal striking surface of the concave portion joined to the slab has the discarding mold, the brush drawing process is unnecessary.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a procedure of a method of manufacturing a partial PC beam according to the present invention. 2A and 2B are also explanatory diagrams. FIG. 2C is a sectional view showing another embodiment of the discarding mold fixing material. In the figure, reference numeral 11 is a step portion of the form, 12 is a discard form, 13 is a fixing number line, 14 is a spacer, 15 and 15a are discard form fixing materials, and 16 is a partial PC.
Beams and 19 indicate molds, respectively. The same reference numerals are attached to the portions corresponding to the conventional example.

A method of manufacturing a partial PC beam according to the present invention will be described with reference to FIG.
As shown in (a), the upper end streak 2 and the lower end streak 3 are turned upside down to bind and fix them to the stirrup 4 with a numbered wire, and a discarding form for forming a recess 10 to be joined to the slab. 12 is erected and fixed to the stirrup 4 with the number wire 13, and the rebar cage 1a is assembled first.

The discarding mold 12 uses a metal lath made of wire mesh. Next, the ears 8 of the PC beam
The step portion 11 for forming the upper end surface of the is formed on the lower portion of the side wall of the formwork 19.

A spacer 14 is laid on the bottom surface of the mold 19 provided with the stepped portion 11, and the rebar cage 1a is turned upside down inside the mold 19 as shown in FIG. Drop it. At this time, the upper end bar 2 and the lower end bar 3 of the rebar cage 1a
Is fixed at the mouth.

In the gap between the stirrup 4 on the bottom side of the formwork 19 and the discarding formwork 12, a discarding form which prevents deformation of the discarding formwork 12 due to pressure when concrete is placed in the formwork 19. The frame fixing material 15 is interposed. The discarding mold fixing material 15 is made of Styrofoam and has a rectangular cross-sectional shape, and one having a half length of the span of the mold 19 is inserted from both of the mouths.

After that, as shown in FIG.
Concrete 16 is placed in 9 and steam cured. The cast concrete 16 is a concrete having a small slump value so that water does not leak from the mesh of the discarding form 12.

Also, the cast concrete 16 has a formwork 19
2 (a), the upper end face is set in a slightly raised state. Then, after placing the concrete 16, the concrete 1 is fully pressed and then the concrete 1
Wait for the sinking of 6 and finish with gold iron. After that, when sufficient strength is developed, it is demolded, and as shown in FIG.
Pull out the discarding frame fixing material 15 from the side and
The beam 16 is completed.

With such a manufacturing method, the partial PC beam 16
However, the discarding mold fixing material 15 is formed so that it can be easily inserted from both sides of the mouth and removed easily.
As shown in FIG. 2C, a rubber tube 15a having a rectangular cross-section may be used, and the tube body 17 is initially evacuated and evacuated from the internal space 18 of the tube main body 17 to form a mold 19
It is inserted into the rebar cage 1a therein, and then air is sent into the internal space 18 to inflate it for use. And FIG.
After the demolding shown in (b), the air in the internal space 18 is again evacuated to constrict and remove it. In this way, insertion / removal becomes extremely easy.

[0016]

As described above, the partial PC of the present invention
The method of manufacturing the beam is that the upper and lower bars are placed upside down, and the discard formwork for forming the recess to be joined with the slab is erected and fixed on the stirrup and the rebar cage is assembled first. A step for forming the upper end surface of the ear portion of the PC beam is formed in the lower part of the side wall of the formwork, the spacer is laid on the bottom surface of the formwork, and then the rebar cage is turned upside down. After dropping into the frame, interposing a discard form fixing material that prevents deformation of the discard form in the gap between the stirrup on the bottom side of the form and the discard form, and then after pouring and curing concrete Since the manufacturing method is performed by demolding, the ear of the partial PC beam is located below the mold to improve the filling property, so that the occurrence of so-called junkers is prevented and the product quality is improved. In addition, since the discarding form is embedded in the horizontal jointing surface with the slab in the concave portion of the partial PC beam and the joining property is good, the brushing process is unnecessary and the work efficiency is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a procedure of a method of manufacturing a partial PC beam according to the present invention.

2 (A) and 2 (B) are also explanatory views showing the procedure of the manufacturing method, and FIG. 2 (C) is a sectional view showing another embodiment of the discarding mold fixing material.

FIG. 3 is an explanatory view showing a manufacturing method according to a conventional example.

[Explanation of symbols]

11 step part of formwork, 12 discard formwork, 13 fixing number line, 14 spacer, 15, 15a discard formwork fixing material,
16 partial PC beam 19 formwork.

Claims (1)

[Claims] 1. A rebar cage is pre-assembled by arranging the upper end bar and the lower end bar upside down and erection / fixing a waste formwork for forming a recess to be joined with a slab on a stirrup. A step for forming the upper end surface of the ear portion of the beam is formed in the lower part of the side wall of the formwork, and the spacer is laid on the bottom surface of the formwork, and then the rebar cage is turned upside down. Drop it into the space between the stirrup on the bottom side of the formwork and the discard formwork, and insert a discard formwork fixing material to prevent the deformation of the formwork, then pour concrete and cure it. A method for manufacturing a partial PC beam, which is characterized by being formed by molding.