JP2715955B2 - Mortar-filled rebar joint sleeve jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a jig used for placing concrete by mounting a mortar-filled reinforcing joint sleeve on a form of PC building material.

[0002]

2. Description of the Related Art PC building materials provided with mortar-filled rebar joint sleeves are manufactured in dedicated factories or construction sites. In dedicated factories equipped with transport facilities such as cranes, PC building materials are often manufactured in a laid state, that is, they are often sideways. However, the PC building material can be manufactured in an upright state, that is, it can be longitudinally punched. Since vertical building PC building materials can be lifted and constructed as they are, when building PC building materials at a construction site, vertical building has been particularly desired.

When casting a PC building material, a rubber cylindrical jig is fixed to the inner surface of the form with a bolt and nut, and one of the rebar insertion openings of the sleeve is fitted over the jig to form the main body. Attach to This jig positions the main body with respect to the formwork, and also prevents slag from flowing into the main body during casting. A plurality of sleeves are collectively attached to the formwork. For this purpose, a hoop is hung on the plurality of sleeves in advance so that the sleeves are arranged at predetermined intervals.
Insert the rebar insertion openings of the multiple sleeves assembled in this way into the respective jigs temporarily fixed to the inner surface of the form with bolts and nuts, and then tighten the bolts and nuts, thereby expanding each rubber jig in the radial direction The rebar insertion opening was sealed and fixed to the inner surface of the formwork.

[0004]

In the case of vertical striking, a plurality of jigs temporarily fixed to the bottom plate of a formwork are hung from a plurality of hoops from above, and a combined sleeve is lowered to fix each rebar insertion opening. The fitting must be fitted and the nut must be tightened from the underside of the form bottom plate. However, since the conventional jig has a cylindrical shape, the jig cannot be fitted into the rebar insertion opening unless the respective cores of the plurality of sleeves and the jig match each other. The task of matching all individual cores was extremely difficult. Further, in order to fix the jig after inserting the jig into the rebar insertion opening, it is not easy to tighten the nut in a narrow space on the lower surface of the formwork.

The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to be able to be fixed to a formwork from the beginning, and to have the sleeve and the core slightly displaced from each other. Another object of the present invention is to provide a jig that can be securely inserted into the rebar insertion opening of the sleeve.

[0006]

Means for Solving the Problems To achieve the above object, a means adopted by the present invention is to form a tip of a jig to be fixed to a form in advance into a tapered shape so that the jig and an inner surface of the form can be formed. This is because a highly elastic seal plate such as a rubber plate is provided therebetween.

[0007]

Since the jig is fixed to a predetermined position on the inner surface of the form by a bolt and a nut in advance, there is no need to tighten the nut in a narrow space under the form. Since the hoops are hung from above on the fixed jigs and the plurality of sleeves are lowered, the core of the jig and the main body are slightly displaced, but the tip of the jig is tapered, so the tip is Enter the rebar insertion slot of the main unit. Although the hoop is hung, the individual sleeves can be moved to some extent, so that the sleeves are guided by a jig inserted into the rebar insertion opening and become coaxial with the jig. Next, the sleeve is put on the seal plate, and the seal plate is elastically deformed by the weight of the reinforcing bar and the sleeve, and the end face is brought into close contact with the seal plate. As described above, since the end face of the sleeve is in close contact with the seal plate so as to bite into the seal plate, there is no possibility that the slag flows into the inside from the end face of the sleeve during driving.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A jig of the present invention will be described based on an embodiment shown in the drawings. As shown in FIG. 1, the jig includes a metal body 10 and
It comprises a bolt 13 projecting from the end face on the root side of the main body, a nut 14 screwed to the bolt, and a rubber sealing plate 15 interposed between the main body 10 and the inner surface of the formwork 30. Body 10
Has a frusto-conical tip 11 and a cylindrical root 12,
A bolt hole 16 through which the bolt 13 of the main body 10 passes is formed in the seal plate 15.

As shown in FIG. 2, when a PC building material is vertically struck, seal plates 15 are respectively arranged at a plurality of predetermined positions on the inner bottom surface of a formwork 30, and bolts 13 are passed through the seal plates 15. A nut 14 is hung on the bolt 13 that has penetrated the bottom plate 31 of the form 30, and the nut is tightened to fix the main body 10 to the bottom plate 31 of the form 30. The bottom plate 31 of the formwork 30 to which the main body 10 is fixed is placed on an abutment 32 laid on the ground or floor.

As shown by the arrows, the plurality of sleeves 20 which are hung on the hoop 25 and arranged at a predetermined interval are formed into a frame 30.
, And the rebar insertion opening 21 of each sleeve is fitted into the main body 10. At this time, the axis of the main body 10 fixed to the bottom plate 31 of the formwork 30 and the axis of the sleeve 20 fitted therewith are slightly shifted as shown by the eccentricity e in the figure. Since 11 has a truncated cone shape, its tip enters the rebar insertion slot 21 even if it is not coaxial with the rebar insertion slot. Although the hoop 25 is hung, the sleeve 20 is somewhat movable therein, so when the tip 11 of the jig body 10 enters the rebar insertion slot 21, the sleeve 20 descends, Guided by a conical surface, the center of the sleeve 20 is
Matches 10 axes. Therefore, the cylindrical root 12 of the main body 10
Fits in the rebar insertion opening 21. When the sleeve 20 is released, the end face 22 of the sleeve 20 comes into close contact with the surface of the seal plate 15 due to the weight of the sleeve 20 and the reinforcing bar, as indicated by a chain line in the figure. Thus, the end face of the sleeve 20 is
When the concrete is cast, there is no danger that the slag flows into the inside from the rebar insertion opening 21 at all.

[0011]

As described above, the jig of the present invention differs from the conventional jig in which the main body is cylindrical, which is fitted into the rebar insertion opening of the sleeve and then fastened with a nut to fix the frame. It is a method of fixing in advance with a bolt nut at a predetermined position on the formwork, but since the tip of the jig body is frustoconical, when fitting the sleeve into the jig, the axis of the sleeve and the axis of the jig Even if there is some deviation, the axis of the sleeve is self-aligned and coincides with the axis of the jig. An excellent effect is achieved.

In addition, since a highly elastic seal plate is provided between the inner surface of the form and the jig body, in the case of vertical striking, the end surface around the rebar insertion opening bites into the sleeve due to its own weight of the rebar and the sleeve, so that it comes into close contact with the sleeve. In addition, a special effect is obtained in that there is no possibility that the slag flows into the inside of the sleeve from the rebar insertion hole at the time of driving.

[Brief description of the drawings]

FIG. 1 is an exploded side view showing a jig according to an embodiment of the present invention;

FIG. 2 is a side view showing a state where the sleeve is fitted to the jig of FIG. 1,

[Explanation of symbols]

 10: Body, 11: Tip, 12: Root, 13: Bolt, 14: Nut, 15: Seal plate, 16: Bolt hole, 20: Sleeve, 21: Reinforcement insertion slot, 22: End face, 30: Formwork , 31: Bottom plate, 32: Abutment

Claims (2)

(57) [Claims] 1. A main body (10) fitted inside a rebar insertion opening (21) of a sleeve (20), a bolt (13) projecting from a bottom surface of the main body and penetrating a formwork (30), and A jig comprising a nut (14) for tightening and fixing the main body to the formwork; a tip (11) of the main body (10);
Is formed in a tapered shape, and a highly elastic sealing plate (15) is arranged between the main body and the formwork. 2. A jig for a mortar-filled rebar joint sleeve according to claim 1, wherein the tip (11) of the main body (10) is formed in a truncated cone shape.