JP2013199056A - Device for positioning coupling sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device for positioning a coupling sleeve.SOLUTION: A spherical body 4 as a wedge member is disposed movably in an axial line direction of a device body 2 and immovably in a direction orthogonal to the axial line in a storage hole 2e of the device body 2. A male screw member 7 is threadedly engaged with the device body 2 and the sphere body 4 is pushed against a top end surface of the male screw member by a compression coil spring 6. In the device body 2, a pressing member 8 which penetrates a circumferential part of the device body and of which the inner end part comes in contact with the spherical body 4 and of which the outer end part is protruded outside from the device body 2 is disposed immovably in the axial line direction of the device body 2 and movably in the radial direction. When the sphere body 4 is moved rightward with the male screw member 7, the sphere 4 moves the pressing member 8 outward. The pressing member 8 strikes against an annular protrusion part E1 of a coupling sleeve E and positions the coupling sleeve E with respect to the axial line direction and the direction orthogonal to the axial line.

Description

  The present invention relates to a positioning device used when a precast concrete member such as a precast concrete column is manufactured with a mold, and more particularly to a positioning device for positioning a joint sleeve for connecting reinforcing bars to a mold.

  Generally, this type of positioning device includes, as described in Patent Document 1 below, a cylindrical device body that is horizontally disposed inside a mold and fixed to an end wall of the mold, and the device body. A wedge member housed in the interior thereof so as to be movable in the axial direction, a male screw member that penetrates the end wall of the mold from the outside and enters the apparatus body, and is screwed into a female screw hole formed in the wedge member; And a plurality of pressing members provided on the peripheral wall of the apparatus main body so as to be movable in the radial direction.

  When positioning the joint sleeve by using the positioning device having the above-described configuration, the joint is extrapolated to the apparatus main body in advance. Then, the male screw member is rotated, and the wedge member is moved so as to approach the end wall. Then, each pressing member is moved radially outward of the apparatus main body by the wedge member. Each pressing member abuts against an annular protrusion formed on the inner peripheral surface of the joint sleeve and presses the joint sleeve in its radial direction. As a result, the joint sleeve is positioned in the radial direction. Each pressing member presses the joint sleeve in the axial direction to press it against the end wall of the mold. Thereby, positioning of the joint sleeve in the axial direction is performed. In this way, the joint sleeve is positioned on the mold.

Japanese Patent No. 4509897

  In the conventional joint sleeve positioning device, since the female screw hole is formed in the wedge member, the wedge member has a larger diameter by the amount of the female screw hole. When the wedge member has a large diameter, there is a problem in that the apparatus main body that accommodates the wedge member has a large diameter, resulting in an increase in the size of the entire apparatus.

This invention was made in order to solve the above-mentioned problem, and when manufacturing a precast concrete member embedded with a main rebar using a formwork, a cylindrical shape attached to one end of the main rebar. A device for positioning the joint sleeve on the mold, which is provided in a fixed position inside the mold, and is provided in the apparatus main body so as to be movable in the axial direction thereof. A wedge member having an inclined surface that is inclined with respect to the moving direction, and the tip is inserted into the apparatus main body through the mold from the outside, and the wedge member is moved in the axial direction of the apparatus main body. When the wedge member is moved by the screw member, the screw member to be moved and a pressing member provided on the peripheral wall portion of the apparatus main body so as to be movable in the radial direction but not movable in the axial direction are provided. Inside the body The inner end of the pressing member protruding to the outside is pushed radially outward of the apparatus main body by the inclined surface of the wedge member, the pressing member moves to the outer side, and the pressing member protrudes to the outside from the apparatus main body. In the joint sleeve positioning device in which the outer end of the joint sleeve abuts against the engaging protrusion formed on the inner peripheral surface of the other end of the joint sleeve which is extrapolated to the device main body, the screw member is the mold or the device The tip of the pressing member is pressed against the wedge member so that the wedge member is moved inward when the screw member moves inward from the outside to the inside of the formwork. The inclined surface of the wedge member is inclined so as to be directed radially inward of the apparatus main body toward the front in the inner direction, and the wedge member is moved in the inner direction. To come, the pressing member is characterized by being moved radially outward of the apparatus main body by the inclined surface of the wedge member.
In this case, the wedge member is formed of a spherical body, and a portion of the outer peripheral surface of the wedge member that faces the screw member side and is located on the outer peripheral side in the radial direction of the apparatus main body is the inclined surface. It is desirable that
It is desirable that urging means for urging the wedge member in a direction from the inside of the mold to the outside to urge the wedge member against the tip of the screw member is provided inside the apparatus main body. .
It is desirable that a male screw member is used as the screw member, a protrusion that penetrates the mold is formed in the apparatus main body, and a screw hole into which the male screw member is screwed is formed in the protrusion.
A nut is screwed into a tip portion of the protruding portion of the apparatus main body that penetrates the mold, and the apparatus main body is attached to the mold by sandwiching the mold with the nut and the apparatus main body. It is desirable.

  According to the present invention having the above-described characteristic configuration, since the screw member pushes the wedge member, the female screw hole into which the screw member is screwed is not formed in the wedge member. Therefore, the wedge member can be reduced in diameter, and the apparatus main body that accommodates the wedge member can be reduced in diameter. Therefore, the whole positioning device can be reduced in size.

FIG. 1 is a cross-sectional view showing an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a main part of the embodiment in a state in which the joint sleeve is positioned and fixed to the mold frame. FIG. 3 is an enlarged cross-sectional view showing the main part of the embodiment in a state before the joint sleeve is positioned and fixed to the mold frame.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows a formwork apparatus A in which a joint sleeve positioning apparatus 1 according to the present invention is used. The formwork apparatus A is for manufacturing a precast concrete column (precast concrete member). Of course, the positioning device 1 according to the present invention can also be applied to a formwork device for manufacturing other precast concrete members such as a precast concrete wall.

First, the precast concrete column manufactured by the formwork apparatus A will be described. The precast concrete column has a concrete section (not shown) having a square section. A reinforcing bar C is provided inside the concrete portion. The reinforcing bar rod C has a plurality of main bars D, hoop bars (not shown), and a plurality of joint sleeves E.

The main reinforcement D is provided with its longitudinal direction directed to the longitudinal direction of the precast concrete column. And each principal reinforcement D is arrange | positioned along the outer peripheral surface of a precast concrete pillar. The hoop muscles are used to connect and fix all the main muscles D, are arranged so as to surround the outer sides of the main muscles D, and are fixed to the main muscles D by fixing means such as a bundle. The joint sleeve E has a cylindrical shape, and one end portion (the left end portion in FIG. 1) of the main bar D is inserted and fixed to one end portion (the right end portion in FIG. 1). In the following, for convenience of explanation, the formwork device A and the positioning device 1 will be described using the left and right and top and bottom of FIG. Of course, the positioning device 1 is not limited to such a direction.

A formwork apparatus A for producing a precast concrete column having the above-described structure has a formwork B. Formwork B has the same internal shape as the concrete part of the precast concrete pillar, in particular the same internal shape as when the concrete part is placed horizontally with the longitudinal direction facing the left and right direction, and the upper part is open It is formed in a box shape with a square cross section. Therefore, inside the formwork B, the reinforcing bar C is horizontally arranged with its longitudinal direction facing the left-right direction. A joint sleeve E is positioned and fixed to the left end wall B1 of the mold B by the positioning device 1 according to the present invention. For this purpose, the left end wall B1 is formed with a plurality of mounting holes B2 (see FIGS. 2 and 3) penetrating in the left-right direction. The mounting hole B2 is arranged in a state in which the axis line thereof coincides with the axis line of the main reinforcement D. The right end wall B3 of the mold B is provided with a plurality of through holes B4. Each through-hole B4 is arrange | positioned so that each principal reinforcement D and an axis line may correspond, and the right end part of each principal reinforcement D is each inserted by the sealing state.

Next, the joint sleeve positioning apparatus 1 according to the present invention will be described. As shown in FIGS. 2 and 3, the positioning device 1 has a device body 2. The apparatus main body 2 has a cylindrical shape with a short cross section, and has a large diameter portion 2a and a small diameter portion (protrusion portion) 2b whose axes are aligned with each other. Between the large diameter part 2a and the small diameter part 2c, the contact surface 2c is formed in an annular shape.

The apparatus main body 2 is horizontally arranged with its longitudinal direction facing the left-right direction. The large-diameter portion 2 a of the apparatus main body 2 is disposed inside the mold frame B. On the other hand, the small diameter portion 2b is fitted in the mounting hole B2. Thereby, the axis of the apparatus main body 2 is matched with the axis of the main muscle D. The left end portion of the small diameter portion 2b (the tip portion of the protruding portion) is protruded to the outside from the mounting hole B2, and the nut 3 is screwed there. When the nut 3 is tightened, the contact surface 2c contacts the inner surface of the left end wall B1, and the left end wall B1 is sandwiched between the nut 3 and the large diameter portion 2a. Thereby, the apparatus main body 2 is being fixed to the left end wall B1.

Inside the apparatus main body 2, a first screw hole 2d, a housing hole 2e, and a second screw hole (screw hole) 2f are formed sequentially from the right end surface to the left end surface.

A metal sphere (wedge member) 4 is accommodated in the accommodation hole 2e. The spherical body 4 has an outer diameter substantially the same as the inner diameter of the accommodation hole 2e, and is accommodated in the accommodation hole 2e so as to be movable in the axial direction and immovable in a direction perpendicular to the axis. Instead of the sphere, a member having a truncated cone shape or a truncated pyramid shape may be used as the wedge member. When a wedge member having a truncated cone shape or a truncated pyramid shape is used, the wedge member is disposed so that the small diameter side portion is located on the inner side of the mold B, that is, the right end side of the accommodation hole 2e.

A spring receiver 5 is screwed and fixed to the first screw hole 2d. A compression coil spring (biasing means) 6 is provided between the spring receiver 5 and the sphere 4. The spherical body 4 is urged to the left by the compression coil spring 6.

A male screw member (screw member) 7 is screwed into the second screw hole 2f. A spherical body 4 is pressed against the right end surface of the male screw member 7 by a compression coil spring 6. Therefore, when the male screw member 7 is rotated in the forward / reverse direction and moved in the left-right direction, the sphere 4 moves in the left-right direction following the movement.

A plurality of guide holes 2g extending from the outer peripheral surface to the inner peripheral surface of the accommodation hole 2e are formed in the large diameter portion 2a. Each guide hole 2g is arranged at equal intervals in the circumferential direction of the large diameter portion 2a.

A pressing member 8 is inserted into the guide hole 2g. The pressing member 8 has a short rod shape with a circular cross section, and has an outer diameter substantially the same as the inner diameter of the guide hole 2g. Therefore, the pressing member 8 can move in the radial direction with respect to the apparatus main body 2, but hardly moves in the axial direction. If the pressing member 8 cannot move rightward from a predetermined position, the pressing member 8 may be slightly movable in the left-right direction. Moreover, although the pressing member 8 is formed in a rod shape, it may be formed in a spherical shape.

A first spherical surface 8 a is formed at the inner end of the pressing member 8 located on the radially inner side of the apparatus main body 2. The first spherical surface 8 a is configured by a half of a spherical surface that is centered on the axis of the pressing member 8 and has the same outer diameter as the outer diameter of the pressing member 8. Of the outer surface of the first spherical surface 8 a, the portion facing the left diagonally inner side (the inner side of the device main body 2 in the left diagonal direction) moves the outer surface of the sphere 4 when the pressing member 8 is moved radially inward of the device main body 2. The part of the right half of the right-hand side that faces diagonally outward (inclined surface) is contacted. When the sphere 4 is moved to the right by the male screw member 7 while maintaining this state, the pressing member 8 is moved outward by the wedge action of the inclined portion of the outer surface of the sphere 4. When the sphere 4 is moved to the left by the compression coil spring 6, the pressing member 8 can move radially inward of the apparatus main body 2 by the amount of the sphere 4 moving to the left.

A small-diameter portion 8 b is formed at the outer end of the pressing member 8 located on the radially outer side of the apparatus main body 2. On the other hand, an annular projecting portion (not shown) that projects inward in the radial direction is formed at the outer opening of the guide hole 2g. The inner diameter of the annular projecting portion is substantially the same as the outer diameter of the small diameter portion 8b. Therefore, when the pressing member 8 moves outward in the radial direction of the apparatus main body 2, the step surface 8 c of the pressing member 8 abuts against the annular protrusion. Thereby, the pressing member 8 is prevented from coming out of the guide hole 2g.

A second spherical surface 8d is formed at the outer end of the small diameter portion 8b. The second spherical surface 8d is constituted by a half of a spherical surface that is centered on the axis of the pressing member 8 and has the same outer diameter as the outer diameter of the small diameter portion 8b. The outer end of the second spherical surface 8d is projected outward from the guide hole 2g.

As shown in FIG. 2, a joint sleeve E is externally inserted into the large-diameter portion 2 a of the apparatus main body 2 with a gap having a predetermined size. The joint sleeve E may be extrapolated to the large diameter portion 2a with almost no gap. An annular protrusion (engagement protrusion) E1 is formed at the left end opening of the joint sleeve E. When the spherical body 4 is moved to the right and each pressing member 8 is moved outward, the portion of the outer surface of the second spherical surface 8d of each pressing member 8 that faces diagonally left outward is the inner circumference of the annular protrusion E1. Simultaneously pressing and contacting the right edge of the surface, each pressing member 8 presses the joint sleeve E in its radial direction. As a result, positioning in the direction orthogonal to the axis of the joint sleeve E is performed. Further, when each pressing member 8 moves outward, the annular protrusion E1 is pushed in the axial direction of the joint sleeve E, and the joint sleeve E is moved to the left. The joint sleeve E is pressed against the left end wall B1 via the packing P. Thereby, the joint sleeve E is positioned in the axial direction and fixed to the left end wall B1. In this way, the joint sleeve E is positioned in the axial direction and the direction orthogonal to the axial line, and is fixed to the left end wall B1. The joint sleeve E may be directly pressed and fixed to the left end wall B1 without the packing P interposed.

When a precast concrete column is manufactured by the formwork apparatus A provided with the positioning device 1 having the above-described configuration, the reinforcing bar C is inserted into the formwork B. Next, the right end portion of the main muscle D is inserted into the through hole D4 of the right end wall B3. Thereafter, the positioning device 1 is attached to the left end wall B1. The reason why the positioning device 1 is attached to the left end wall B1 after the reinforcing bar C is inserted into the mold B is to prevent the positioning device 1 from getting in the way when the reinforcing bar C is inserted into the mold B. . If the positioning device 1 does not interfere with the loading of the reinforcing bar C, the positioning device 1 may be attached to the left end wall before loading the reinforcing bar C into the mold B.

Next, as shown by an arrow in FIG. 3, the reinforcing bar C is moved to the left relative to the formwork B, and the left end portion of the joint sleeve E is extrapolated to the large diameter portion 2 a of the apparatus main body 2. . At this time, the sphere 4 is moved leftward to an appropriate position so that the diameter of the circle circumscribing the outermost portion of each pressing member 8 is equal to or less than the inner diameter of the annular protrusion E1. The joint sleeve E is moved until its left end surface substantially contacts the left end wall B1 via the packing P. In this state, the right end edge of the annular protrusion E1 is located on the left side of the outermost portion of the second spherical surface 8d.

Next, the male screw member 7 is rotated in one direction and moved rightward, and the sphere 4 is moved rightward against the urging force of the compression coil spring 6. Then, the pressing member 8 is moved outward by the spherical body 4, and the portion of the pressing member 8 that faces diagonally to the left of the second spherical surface 8 d abuts on the right edge of the annular protrusion E 1 of the joint sleeve E. Then, the pressing member 8 presses the joint sleeve E outward and leftward. As a result, the joint sleeve E is positioned in the axial direction and in a direction perpendicular to the axial line, and is pressed and fixed to the left end wall B1 via the packing P.

Thereafter, concrete is placed in the formwork B. After the concrete is solidified and cured for a predetermined period, the mold B is disassembled. At this time, the male screw member 7 is rotated in the other direction and moved to the left, and the spherical body 4 is moved to the left by the compression coil spring 6. The moving distance of the sphere 4 to the left is a distance until the annular protrusion E1 can pass outside the pressing member 5. Therefore, when the mold B is disassembled, the large diameter portion 2a comes out of the joint sleeve E. Further, the right end portion of the main reinforcement D comes out of the through hole B4 of the right end wall B3. In this way, a precast concrete column is obtained.

In the positioning device 1 having the above configuration, the male screw member 7 abuts on the sphere 4, and the female screw portion into which the male screw member 7 is screwed is not formed on the sphere 4. Accordingly, the outer diameter of the sphere 4 can be reduced, and the outer diameter of the large diameter portion 2a can be reduced correspondingly. Therefore, the whole positioning device 1 can be reduced in size.

In the positioning device 1 described above, the sphere 4 is used as the wedge member, and the sphere 4 can be a commercially available inexpensive steel ball used for a ball bearing or the like. Therefore, the manufacturing cost of the positioning device 1 can be reduced.

Further, since the spherical body 4 is pressed against the male screw member 7 by the compression coil spring 6, the spherical body 4 does not move carelessly. Therefore, it is possible to prevent the sphere 4 from colliding with the apparatus main body 2 and the male screw member 7 during the transfer of the positioning device 1 and the like, and generating noise. Furthermore, the position of each pressing member 8 can be fixed by moving the sphere 4 to the right until the stepped surface 8c hits the annular protrusion formed in the opening of the guide hole 2c. Generation of noise accompanying the movement of the pressing member 8 can also be prevented.

In addition, this invention is not limited to said embodiment, A various modification is employable in the range which does not deviate from the summary.
For example, in the above-described embodiment, the small-diameter portion 2b of the device main body 2 is inserted into the mounting hole B2, and the device main body 2 is fixed to the left end wall B1 of the mold B by the nut 3 screwed into the small-diameter portion 2b. However, as described in Patent Document 1, a bolt that penetrates the left end wall B1 is screwed into the large diameter portion 2a, and the apparatus main body 2 is pressed and fixed to the inner surface of the left end wall B1 by the bolt. Also good. In that case, the small diameter part 2b is unnecessary. When the small diameter portion 2b is not formed, the male screw member 7 may be screwed into the mounting hole B2 of the mold B. However, it is desirable that the apparatus main body 2 is fixed by the nut 3. When a bolt is used, a plurality of bolts are required, and a lot of labor is required for tightening the bolt. On the other hand, when a nut 3 is used, the apparatus main body 2 should be fixed with only one nut 3. This is because the labor required to attach the apparatus main body 2 can be reduced.
Furthermore, in the above embodiment, the male screw member 7 screwed into the second screw hole 2f is used as the screw member, but a cap nut having a bottomed cylindrical shape may be used as the screw member. The cap nut is screwed onto the outer peripheral surface of the small diameter portion 2b. A pressing shaft portion is provided at the bottom of the cap nut. This pressing shaft portion is inserted into the second screw hole 2 f and pressed against the sphere 4. Here, since the pressing shaft portion is not screwed into the second screw hole 2f, a straight hole may be formed instead of the second screw hole 2f.

A Formwork device B Formwork D Main reinforcement E Joint sleeve E1 Engagement projection 1 Joint sleeve positioning device 2 Device body 2a Small diameter part (projection)
3 Nut 4 Sphere (Wedge member)
6 Compression coil spring (biasing means)
7 Male thread member (screw member)
8 Pressing member

Claims (5)

A device for positioning a tubular joint sleeve attached to one end of the main reinforcing bar to the mold when producing a precast concrete member in which the main reinforcing bar is embedded using the mold,
A cylindrical apparatus main body fixed in position inside the mold,
A wedge member provided inside the apparatus main body so as to be movable in the axial direction and having an inclined surface inclined with respect to the moving direction;
A screw member that penetrates the mold from the outside and has a distal end inserted into the apparatus body, and moves the wedge member in the axial direction of the apparatus body;
A pressing member provided on the peripheral wall of the apparatus main body so as to be movable in the radial direction and immovable in the axial direction;
When the wedge member is moved by the screw member, the inner end of the pressing member protruding into the apparatus main body is pushed outward in the radial direction of the apparatus main body by the inclined surface of the wedge member. The member moves outward, and the outer end of the pressing member protruding outward from the apparatus main body is engaged with an engagement protrusion formed on the inner peripheral surface of the other end of the joint sleeve that is externally inserted into the apparatus main body. In the positioning device for the fitting sleeve that abuts,
The screw member is screwed into the formwork or the apparatus body;
The tip of the pressing member is pressed against the wedge member so that the wedge member moves in the inner direction when the screw member moves inward from the outside to the inside of the mold,
The inclined surface of the wedge member is inclined so as to go inward in the radial direction of the apparatus body as it goes forward in the inner direction,
The joint sleeve positioning device, wherein when the wedge member is moved in the inward direction, the pressing member is moved radially outward of the device main body by the inclined surface of the wedge member. The wedge member is formed of a sphere, and the portion of the outer peripheral surface of the wedge member that faces the screw member side and faces the outer peripheral side in the radial direction of the apparatus main body is the inclined surface. The joint sleeve positioning device according to claim 1. The apparatus main body is provided with urging means for urging the wedge member in a direction from the inside to the outside of the mold to press the wedge member against the tip of the screw member. The positioning device for a joint sleeve according to claim 1 or 2. A male screw member is used as the screw member, a protrusion that penetrates the mold is formed in the apparatus main body, and a screw hole into which the male screw member is screwed is formed in the protrusion. The joint sleeve positioning device according to claim 1. A nut is screwed into a tip portion of the protruding portion of the apparatus main body that penetrates the mold, and the apparatus main body is attached to the mold by sandwiching the mold with the nut and the apparatus main body. 5. The joint sleeve positioning device according to claim 4, wherein the joint sleeve positioning device is provided.

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