JP2912999B1 - Jig for positioning sleeve in precast concrete products - Google Patents

Abstract

An object of the present invention is to provide a positioning jig without twisting or the like.
A simple and inexpensive sleeve positioning jig that can accurately position the end of the sleeve at a predetermined position in the mold, has good durability, and can be used repeatedly over a long period of time. It is to be. A shaft (10), an insertion main body (20) inserted through the shaft (10), and the insertion main body (20) being turned from a folded state to a flat state about a center direction of the insertion main body (20) as an axis. A positioning member 30 provided so as to overlap the portion 20; an urging member 40 for urging the positioning member 30 in a folded state; a pressing member 11 provided on the shaft 10; Therefore, the gist of the present invention is to provide a nut portion 50 screwed into the screw portion 12 of the shaft 10 from outside the mold A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve positioning jig used for positioning a sleeve on a mold when molding a precast concrete product having a plurality of sleeves embedded therein.

[0002]

2. Description of the Related Art Generally, when constructing a reinforced concrete building, a precast concrete product 200 as shown in FIG. 6, for example, is erected on a floor to serve as a rising portion such as a pillar. This precast concrete product 2
00 is a sleeve 21 with a plurality of reinforcing bars in concrete.
0 are buried in parallel at predetermined intervals. An end of each sleeve 210 is opened at one end surface of the precast concrete product 200 so that a reinforcing bar projecting above the floor surface can be inserted into each sleeve 210. In addition, on the other end surface of the precast concrete product 200, a reinforcing bar 22 extended on each sleeve 210 is formed.
0 is protruded by a predetermined length, and a concrete column or the like can be raised and formed using the protruding portions of these reinforcing bars 220. Conventionally, in order to form this type of precast concrete product 200, there are various methods. Among them, for example, a plurality of cylindrical positioning members made of an elastic material such as rubber are provided on one inner surface of a mold. By attaching jigs and fitting these positioning jigs to the open ends of the sleeves 210, the ends of the sleeves 210 are positioned at predetermined positions. Holes are formed, and by inserting each reinforcing bar 220 into these insertion holes and tightening with nuts,
A method has been proposed in which after positioning the insertion portion of the reinforcing bar at a predetermined position, concrete is poured into a formwork and each sleeve 210 is embedded in the precast concrete product 200.

[0003]

However, in this conventional method, a cylindrical positioning jig made of an elastic material such as rubber is inserted into the opening end of the sleeve 210 and the end of the sleeve 210 is inserted. Since the positioning jig is positioned with respect to the mold, the positioning jig is twisted, so that the end of the sleeve 210 cannot be accurately positioned at a predetermined position, and the positioning jig has poor durability. Therefore, there has been a problem that it cannot be used repeatedly over a long period of time.

An object of the present invention is to solve such a problem, and an object of the present invention is to accurately position an end of a sleeve at a predetermined position in a mold without causing a twist or the like in a positioning jig. It is an object of the present invention to provide a sleeve positioning jig which has good durability, can be used repeatedly over a long period of time, has a simple structure and is inexpensive.

[0005]

In order to solve the above problems, the means adopted by the present invention will be described with reference numerals used in the embodiments. When a plurality of sleeves B with rebar are extended in parallel in A and concrete is poured into the formwork A to form a precast concrete product,
A sleeve positioning jig 10 to be attached to the inner surface of the mold A and detachably inserted into the sleeve B for use.
0, the mounting hole A1 of the formwork A
A shaft 10 movably inserted into the shaft 10, and an insertion main body portion inserted through the shaft 10 so as to be relatively movable in the axial direction thereof, mounted on one inner surface of the mold A and inserted into the sleeve B. 20 and the shaft 10 are inserted so as to be relatively movable in the axial direction, and are rotated from the folded state to the plane state about the center direction of the insertion main body 20 as an axis, thereby overlapping the insertion main body 20. A positioning member 30, a biasing member 40 for biasing the positioning member 30 toward an inner position so as to be separated from the inner peripheral surface of the sleeve B, and a shaft 10.
With the movement of the pressed surface 3 located in the opposite direction to the overlapping surface of the positioning member 30 with the insertion main body 20.
1 is provided on the shaft 10 so as to move from the folded state to a flat state by being pressed, and to be moved to an outer position to be joined to the inner peripheral surface of the sleeve B by being superimposed on the insertion main body 20. In order to move the pressing member 11 and the shaft 10, the shaft 1 is moved from outside the formwork A.
The gist of the present invention is to include a nut portion 50 screwed to the zero screw portion 12.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a jig 100 for positioning a sleeve in a precast concrete product according to the present invention will be described. However, this is a typical example, and unless it exceeds the gist thereof. The present invention is not limited by the following examples.

FIGS. 1 to 4 are views showing a sleeve positioning jig 100 according to the present invention. As shown in these figures, the sleeve positioning jig 100 is shown in FIGS.
Has a shaft 10 movably inserted into a mounting hole A1 of a mold A, and a screw portion 12 is formed on an outer surface thereof. Then, an insertion main body 20 that is relatively movable in the axial direction of the shaft 10 is inserted therethrough.
The insertion main body 20 is formed in a circular shape smaller than the inner diameter of the inner periphery of the opening end of the sleeve B, and side edges 21 projecting in a right angle direction are provided at both ends.
The side edges 21 are provided with shaft portions 22 protruding in the direction of the center of the insertion main body portion 20 and at right angles from the side edge portions 21, respectively. It can be freely attached to the shaft.

Next, the positioning member 30 which is a feature of the sleeve positioning jig 100 according to the present invention will be described.

The positioning member 30 is inserted so as to be relatively movable in the axial direction of the shaft 10, and includes one and the other that rotate from the center-folded state to the plane state about the center direction of the insertion main body 20. It is composed of two members. As shown in FIG. 2 or FIG. 4, the two members constituting the positioning member 30 are rotatably mounted on the shaft portions 22 provided on the both side edge portions 21 described above. Further, a circular joint portion 32 is formed at the distal end portions of the two members constituting the positioning member 30 along the inner peripheral surface of the sleeve B, and as shown by a chain line in FIG. It is formed so that it can be joined to the inner peripheral surface of the sleeve B when it is moved to the outer position. And positioning member 3
0 is urged by the urging member 40 toward the inside position so as to be always separated from the inner peripheral surface of the sleeve B toward the inside position.

As shown in FIG. 1, the urging member 40 is formed of a resilient material into a twisted spiral spring shape.
Is inserted into one of the members constituting the positioning member 30, and the other end is inserted and inserted into the insertion body 20 around the shaft portion 22. It is provided in. The other member constituting the positioning member 30 is also urged similarly. This urging member 4
0, the two members constituting the positioning member 30 are normally urged in a folded state with the center direction of the insertion main body 20 as an axis, and the inner diameter of the inner peripheral flange B1 formed at the open end of the sleeve B. It is set to be smaller than. As a result, the positioning jig 100 is easily inserted into the sleeve B.

Next, the nut portion 50 is screwed into the screw portion 12 of the shaft 10 from the outside of the formwork A. By tightening the nut portion 50, the shaft 10 moves in the outward direction of the formwork A. It is designed to be screwed. The pressing member 11 formed in a circular shape is fixed to the tip end of the shaft 10, and is formed on a tapered surface 11 a on the outer peripheral edge of the back surface so as to easily press the pressed surface 31 of the positioning member 30. Have been. And the nut part 50
When the mold member A is moved outward by tightening, the pressed surface 31 of the positioning member 30 is pressed by the tapered surface 11a of the pressing member 11 while being in contact with the pressing member 11. Is rotated to the outer position shown in FIG. 3 or FIG. In this state, the joint 32 of the positioning member 30 is joined to the inner peripheral surface of the sleeve B, and the open end of the sleeve B is positioned at a predetermined position on the inner surface of the mold A. As described above, the positioning jig 100 can be easily tightened or loosened with the screw portion 12 of the shaft 10.
Can be easily joined to or separated from the inner peripheral surface of the sleeve B. Further, since the outer peripheral edge of the back surface of the pressing member is formed as a tapered surface, the contact of the positioning member urged in the middle-folded state with the pressed surface becomes smooth. Therefore, since the positioning member 20 can be easily rotated from the middle-bent state to the flat state, the work of tightening the nut portion 50 can be easily performed. Therefore, the work of tightening the nut portion 50 can be easily performed.

Next, a method for using the sleeve positioning jig 100 configured as described above will be described.

As shown in FIG. 5, the mold A is formed in a box shape, and a plurality of mounting holes A1 and insertion holes A2 are formed on both side walls thereof at predetermined positions at positions corresponding to each other. A plurality of sleeves B with reinforcing bars are arranged in parallel at predetermined intervals between both side walls in the mold, and a positioning jig 100 is attached to an open end of each sleeve B with reinforcing bars.

The mounting state of the positioning jig 100 will be described in detail. As shown in FIGS. 1 to 4, the shaft 10 is inserted through the mounting hole A1 of the mold A and the inner side of the mold A is formed on one side. The insertion main body 20 is mounted. At this time, since the nut portion 50 screwed to the screw portion 12 of the shaft 10 is not tightened, the positioning member 30
As shown in FIG. 1 or FIG. 2 described above, since the urging force of the urging member 40 normally urges the insertion main body 20 in the center-bending state about the center direction of the insertion main body 20, the opening of the sleeve B is opened. It is set to be smaller than the inner diameter of the inner peripheral flange B1 formed at the end. As a result, the positioning jig 100 is easily inserted into the open end of the sleeve B.

Next, when the nut portion 50 screwed to the screw portion 12 of the shaft 10 from the outside of the mold A is tightened, the shaft 10 moves to the outside of the mold A, and accordingly, the shaft Pressing member 11 fixed to the tip of 10
Also move outward of the form A. Subsequently, when the nut portion 50 is further tightened, the pressed surface 31 of the positioning member 30 is pressed by the tapered surface 11 a of the pressing member 11 while contacting the pressing member 11. 2 or 4, is rotated to the outer position. In this state, the joint 32 of the positioning member 30 is joined to the inner peripheral surface of the sleeve B, and the sleeve B
Is positioned at a predetermined position on the inner surface of the mold A. Similarly, another plurality of sleeves B with rebar are positioned at predetermined positions in parallel at predetermined intervals between both side walls in the mold A.

On the other hand, the reinforcing bar B2 extended from the sleeve B is inserted into each of the insertion holes A2 in the other side wall of the mold A, and protrudes outside the mold A by a predetermined length. Are screwed together, and by tightening these nuts,
The reinforcing bar B2 is positioned at a predetermined position with respect to the other side wall of the mold A.

As described above, the strip C is wound around each sleeve B and the reinforcing bar B2 in a state in which the plurality of sleeves B with reinforcing bars are arranged between both side walls in the mold A and are positioned at predetermined positions. After that, concrete is poured into the formwork A.
Finally, after the precast concrete product has hardened, if the nut A tightened to the shaft 10 of the positioning jig 100 is loosened and the mold A is removed, a plurality of sleeves with reinforcing bars are embedded therein. The resulting precast concrete product is formed.

Regarding the effects exhibited by the embodiment of the sleeve positioning jig 100 according to the present invention,
This will be described below.

As described above, the jig 10 for positioning the sleeve in the precast concrete product according to the present invention.
Reference numeral 0 denotes a shaft 10 movably inserted into the mounting hole A1 of the mold A, and a shaft 10 which is movably inserted in the axial direction of the shaft 10 so as to be attached to the inner surface of one side of the mold A. B is inserted into the insertion main body 20 that is inserted into the shaft B so as to be relatively movable in the axial direction of the shaft 10, and rotates from a center-folded state to a plane state about the center direction of the insertion main body 20 as an axis. The insertion body 2
A positioning member 30 provided so as to be superimposed on zero; an urging member 40 for urging the positioning member 30 toward an inside position so as to be separated from the inner peripheral surface of the sleeve B; With the movement of 10, by pressing the pressed surface 31 located in the opposite direction to the overlapping surface of the positioning member 30 and the insertion main body portion 20,
The insertion main body 2 is rotated from the folded state to the flat state.
In order to move the shaft 10 with the pressing member 11 provided on the shaft 10 so as to move to the outer position where it is joined to the inner peripheral surface of the sleeve B by superimposing the shaft
And a nut portion 50 screwed into the screw portion 12 of the shaft 10 from outside the mold A.

Therefore, the positioning jig 100 can be easily joined to or separated from the inner peripheral surface of the sleeve B by a simple operation of tightening or loosening the nut portion 50 on the screw portion 12 of the shaft 10. Further, by forming the outer peripheral edge of the back surface of the pressing member 11 fixed to the tip end portion of the shaft 10 on the tapered surface 11a, the contact of the positioning member 30 urged in the folded state with the pressed surface 31 smoothly. Become. Therefore, since the positioning member 30 can be easily turned from the middle-bent state to the flat state, the work of tightening the nut portion 50 can be easily performed. Therefore, the positioning jig 100 can be easily attached to and detached from the open end of the sleeve B in a short time.

Since the positioning jig 100 has a simple structure with a small number of components,
It can be provided at a low price, and is made of a metal material or the like, so that it has excellent durability, can be used repeatedly over a long period of time, and further, does not twist the positioning jig. Can be reliably positioned at a predetermined position of the formwork.

By the way, the present invention is not limited to the above-described embodiments, but includes improvements, modifications and the like within a range that can achieve the object of the present invention. In the embodiment described above, the positioning member 30 is constituted by two members consisting of one and the other. However, the present invention is not limited to this. Is also good. Further, in the embodiment, the pressing member 11 is fixed to the distal end portion of the shaft 10, but the pressing member 11 is not limited to this. For example, a generally known bolt may be used. When a bolt is used in this way, it is preferable to interpose a washer between the head of the bolt and the positioning member. As described above, by positioning the nut portion 50 by tightening the washer, the positioning member urged in the middle bent state can smoothly contact the pressed surface. It is clear that the embodiment of the positioning jig 100 having such a configuration can obtain substantially the same function as that of the above-described embodiment, so the above description is cited.

The biasing member 40 is formed in the shape of a torsion coil spring. However, the present invention is not limited thereto.
Any urging member may be used as long as the urging member is urged in a center-folded state around the center direction of 0 and urges to become smaller than the inner diameter of the inner peripheral flange B1 formed at the open end of the sleeve B.

[0024]

As described in detail above, according to the first aspect of the present invention, a plurality of sleeves with rebar are extended in parallel in a formwork, and concrete is poured into the formwork.
When molding a precast concrete product, it is premised on a jig for positioning the sleeve to be used by being attached to the inner surface of the formwork and removably inserted into the sleeve, and moved to the mounting hole of the formwork. A shaft that can be inserted, an insertion body that is inserted so as to be relatively movable in the axial direction of the shaft, is mounted on an inner surface on one side of the mold, and is inserted into a sleeve; and an axis of the shaft. A positioning member that is inserted so as to be relatively movable in the direction, and is provided so as to overlap with the insertion main body by rotating from the folded state to a flat state with the center direction of the insertion main body as an axis, An urging member for urging the positioning member toward the inside position so as to be separated from the inner peripheral surface of the sleeve toward the inside position, and a urging member for urging the positioning member with the movement of the shaft. By pressing a pressed surface located in a direction opposite to the overlapping surface with the insertion main body, the inner circumference of the sleeve is rotated by rotating from a folded state to a flat state and overlapping with the insertion main body. It comprises a pressing member provided on the shaft for moving to an outer position to be joined to a surface, and a nut portion screwed to a screw portion of the shaft from outside the formwork for moving the shaft. is there.

With this, the positioning jig can be easily joined to or separated from the inner peripheral surface of the sleeve by a simple operation of tightening or loosening the nut portion to the screw portion of the shaft. Can be easily attached to and detached from the opening end of the sleeve in a short time.

The positioning jig can be provided at a low cost because it is composed of a small number of components and has a simple structure, and is durable because it is made of a metal material or the like. It has an excellent effect that it can be repeatedly used over a long period of time, and further, the end of the sleeve can be reliably positioned at a predetermined position of the mold without twisting of the positioning jig. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an embodiment of a sleeve positioning jig according to the present invention is mounted in a mold.

FIG. 2 is a sectional view showing a section between X1 and X1 in FIG. 1;

FIG. 3 is a sectional view showing an operation state of a jig for positioning the sleeve of FIG. 1;

FIG. 4 is a sectional view showing a section between X2 and X2 in FIG. 3;

FIG. 5 is a sectional view showing a state in which a sleeve positioning jig according to the present invention is mounted in a sleeve with a reinforcing bar disposed on a mold.

FIG. 6 is a perspective view showing a precast concrete product having a plurality of sleeves with reinforcing bars embedded therein.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Jig for positioning sleeve 10 Shaft 11 Pressing member 12 Screw portion 20 Inserting main body portion 21 Side edge portion 22 Shaft portion 30 Positioning member 31 Pressed surface 32 Joint portion 40 Energizing member 50 Nut portion A Formwork A1 Mounting hole B sleeve B1 Inner circumference flange

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B28B 7/00 B28B 23/02

Claims (1)

(57) [Claims] A plurality of sleeves with rebar are extended in parallel in a formwork, and concrete is poured into the formwork to be attached to the inner surface of the formwork when forming a precast concrete product. In a jig for positioning a sleeve to be used by being detachably inserted into a sleeve, a shaft movably inserted into a mounting hole of the formwork, and a shaft movably inserted in an axial direction of the shaft,
An insertion body attached to one inner surface of the mold and inserted into the sleeve, and is inserted so as to be relatively movable in the axial direction of the shaft,
A positioning member provided so as to be overlapped with the insertion main body by rotating from the center-folded state to a planar state around the center direction of the insertion main body as an axis; and An urging member that urges the inner bending position toward the inside position so as to be separated, and a pressed surface that is located in a direction opposite to an overlapping surface of the positioning member and the insertion main body portion with the movement of the shaft. A pressing member provided on the shaft so as to move to an outer position where it is joined to the inner peripheral surface of the sleeve by rotating from a folded state to a planar state and superimposed on the insertion main body by pressing And a nut portion screwed into the thread portion of the shaft from outside the formwork to move the shaft. Jig decided.