JPH08267435A - Sleeve for piercing prefabricated concrete panel and mold releasing jig - Google Patents

Abstract

PURPOSE: To provide a sleeve for piercing a prefabricated concrete panel which can deal with the panel having various thicknesses by a small piercing sleeve and in which the installation and the mold releasing are simple and a mold releasing jig therefor. CONSTITUTION: The sleeve for piercing a prefabricated concrete panel comprises a bottom plate 3 fixed to a base 2, a cylindrical body 4 having an end face closed at one end and an opening end engaged with the plate at the other end, and a through bolt 5 for fixing the body 4 to the plate 3, wherein the oblique surface 11 for guiding the end of the bolt 5 to the bolt hole 10 of the base 2 is provided in a through hole 8 for the bolt of the plate 3, the side peripheral face 9 of the bottom plate is formed in an oblique surface spreading down, the opening end inner periphery 12 of the body is formed at the oblique surface engaged with the face 9 of the plate, and the through hole of the bolt of the closed end of the body 4 is formed in a long groovelike hole 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve for punching a prefabricated concrete panel and a jig for demolding the sleeve.

[0002]

2. Description of the Related Art Generally, there is known a method in which concrete panels constituting a building are molded in advance at a factory (these concrete panels are called prefabricated concrete panels) and assembled at a construction site.

When molding this prefabricated concrete panel, a formwork in the shape of the prefabricated concrete panel is erected on a flat plate called a base installed on the floor of the factory, and concrete is poured into it. When opening a cable / pipe through hole, a ventilation hole, etc. in this prefabricated concrete panel, concrete is poured after arranging a sleeve for punching inside the formwork.

FIG. 8 shows a sleeve for punching holes in the conventional prefabricated concrete panel.

A conventional punching sleeve 60 for a prefabricated concrete panel comprises a bottom plate 61, a main body 62, and through bolts 63 for integrally fixing the bottom plate 61 and the main body 62.

The bottom plate 61 is composed of a circular plate member, and a through hole 64 through which the through bolt 63 is passed is provided in the center portion thereof.

On the other hand, the main body 62 has a substantially cylindrical shape in which one end surface is open and the other end surface is closed, and a through hole 65 through which the through bolt 63 is passed is provided in the closed end surface. There is. A groove 66 that fits with the outer periphery of the bottom plate 61 is provided on the inner peripheral portion of the open end surface of the main body 62.

A conventional method of molding a prefabricated concrete panel using the punching sleeve 60 will be described below.

In order to install the punching sleeve 60 of the prefabricated concrete panel at a predetermined position, first, the through hole 64 and the bolt hole 67 previously provided in the base 66 are aligned and the bottom plate 61 is arranged. Next, the groove 66 of the main body 62 is fitted into the bottom plate 61, and the main body 62 is arranged. In this state, the through bolt 63 is inserted from the through hole 65 of the main body 62, and the tip of the through bolt 63 is attached to the bolt hole 67 of the base 66.
Screw into. The through bolt 63 is tightened so as to firmly fix the main body 62 and the bottom plate 61 on the base 66.

Precast concrete panels were molded by pouring concrete into the prepared mold and curing it.

Next, the punching sleeve 60 is removed from the prefabricated concrete panel (this work is called demolding). First, the through bolt 63 is removed, and then the prefabricated concrete panel is lifted by a crane or the like to hold the prefabricated concrete panel in an upright state.

From the rear surface of the concrete panel, that is, the surface in contact with the base, an operator knocks out the punching sleeve 60 with a hammer or the like.

After removing the punching sleeve 60 from the mold, damage to the peripheral edge of the hole of the prefabricated concrete panel was manually repaired. Also, the demolded sleeve 6 for punching
0 was collected, cleaned and used again.

In the above-mentioned conventional method for molding a prefabricated concrete panel, when the thickness of the prefabricated concrete panel is different, it is necessary to use the punching sleeves 60 having different heights. Conventional punching sleeve 60
Is usually a one-piece product, so sleeves of different heights were newly manufactured each time.

[0015]

However, as is clear from the above description, the work of removing the punching sleeve of the conventional prefabricated concrete panel described above is difficult. That is, in order to ensure the safety of workers, it was necessary to pay sufficient attention to the work. In addition, equipment such as a crane is required to remove the sleeve from the panel, which requires time and effort.

Further, since the punching sleeve is hammered out with a hammer or the like, the punching sleeve is heavily worn and uneconomical.

Further, after the punching sleeve is released from the mold, damage to the peripheral portion of the hole must be repaired.
It took time and effort for that.

Further, it is not easy to reuse the punching sleeve. That is, concrete easily adheres to the groove that fits with the bottom plate at the open end of the punching sleeve body, so that it has to be removed with a wire brush or the like.
Removal of this concrete was not easy.

Further, in the conventional punching sleeve, the position of the through hole of the bottom plate could not be confirmed from the outside when the punching sleeve body was placed when fixing it to the base. Therefore, it is difficult to screw the through bolt into the bolt hole of the base.

Further, the conventional punching sleeves for prefabricated concrete panels used have punching sleeves having a height equal to the thickness of the prefabricated concrete panel depending on the type of prefabricated concrete panel to be molded. Since it is a single product, it was necessary to prepare a large number of punching sleeves in order to accommodate prefabricated concrete panels of various thicknesses.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional punching sleeves for prefabricated concrete panels, and to accommodate prefabricated concrete panels of various thicknesses with a small number of punching sleeves, and to install and An object of the present invention is to provide a sleeve for punching a prefabricated concrete panel which can be easily demolded and a jig for demolding the same.

[0022]

To achieve the above object, a punching sleeve for a prefabricated concrete panel according to claim 1 of the present invention comprises a bottom plate fixed to a base for molding a prefabricated concrete panel and an end face closed at one end. Have
The other end penetrates a substantially cylindrical body having an open end portion that fits with the bottom plate, and a closed end surface of the cylindrical body, and a tip portion penetrates the bottom plate and is screwed into a bolt hole of the base. In the punching sleeve of the prefabricated concrete panel, which comprises a through bolt for fixing the main body on the bottom plate, the through hole for the through bolt of the bottom plate has a tip portion of the through bolt and a bolt hole of the base. Has a slanted surface that guides to the bottom plate, and the side peripheral surface of the bottom plate is formed as a sloped surface that widens downward, and the inner peripheral surface of the opening end of the main body is formed as a slanted surface that fits with the side peripheral surface of the bottom plate. The closed end surface of the main body has a long groove-shaped long hole through which the through bolt passes.

The pre-fabricated concrete panel punching sleeve according to claim 2 of the present application is the punching sleeve according to claim 1, wherein the shape of the punching sleeve is the same as that of the main body when it is superposed on the top of the main body. It consists of an increasing plate member, and has a positioning projection on the bottom that fits into the long hole of the main body,
It is characterized in that it is provided with a floor thickness adjusting lid having a through hole for penetrating the through bolt.

The demolding jig for punching sleeves of prefabricated concrete panels according to claim 3 of the present application is a pair of legs arranged on both sides of the punching sleeve of claim 1 which is buried in the prefabricated concrete panel. And a horizontal member erected between the both leg portions, and a lever fulcrum jig, and an elongated plate member. The distal end portion is inserted into the elongated hole of the punching sleeve for about 90 minutes. A lever-engaging jig having a bulging portion that engages with the elongated hole when rotated by 0 °, and at least one hole that engages with this tip portion in the main body portion. It is characterized by.

The demolding jig for the punching sleeve of the prefabricated concrete panel according to claim 4 of the present application is inserted into the oblong hole of the punching sleeve of claim 1 which is buried in the prefabricated concrete panel, and the jig is about 90. A cylinder member having a projecting portion that engages with the elongated hole by being rotated by an angle, a first piston member slidably provided at an insertion end portion of the cylinder member into the punching sleeve, and the cylinder member A second piston member that is slidably provided at the end opposite to the insertion end and that compresses the air in the cylinder.

The demolding jig for the punching sleeve of the prefabricated concrete panel according to claim 5 of the present application is inserted into the oblong hole of the punching sleeve according to claim 1 which is buried in the prefabricated concrete panel, and is about 90. The main body having a protruding portion that engages with the elongated hole when rotated by a degree, and the protrusion elastically provided in a nesting shape by an elastic member at the insertion end of the main body into the punching sleeve. And a tension member.

The demolding jig for the punching sleeve of the prefabricated concrete panel according to claim 6 of the present application is inserted into the long hole of the punching sleeve according to claim 1 which is buried in the prefabricated concrete panel, and the jig is about 90. It is characterized in that it has an engaging member which engages with the elongated hole by rotating by an angle of °, and a bar member having a screw threadedly engaged with the engaging member on the outer peripheral surface.

[0028]

According to the pre-fabricated concrete panel punching sleeve of the present invention, the inclined surface of the through hole for the through bolt of the bottom plate is the tip of the through bolt when the through bolt is screwed into the bolt hole of the base. Guide the part to the bolt hole of the base. As a result, it becomes easy to screw the tip end of the through bolt into the bolt hole of the base, and it becomes easy to install the punching sleeve.

Further, since the fitting portions of the punching sleeve and the bottom plate are joined to each other by the inclined surfaces, concrete is unlikely to adhere to this portion. Also, when concrete adheres, it can be easily removed.

Further, since the opening for the through bolt of the punching sleeve main body is a slotted slot, the stripping jig is inserted and rotated by about 90 ° for stripping. The protrusion provided on the jig and the elongated hole can be engaged with each other.

In the prefabricated concrete panel piercing sleeve according to claim 2, the height of the piercing sleeve can be increased by stacking the floor thickness adjusting lid on the upper portion of the main body and fixing it with through bolts. it can. Accordingly, when molding a prefabricated concrete panel thicker than the standard thickness, it is possible to deal with it by stacking the floor thickness adjusting lid on the standard height punching sleeve. By preparing lids of various thicknesses for this floor thickness adjustment, it is possible to reduce the number of piercing sleeves, thereby improving the efficiency of manufacturing precast concrete panels. .

In the die-releasing jig for punching sleeves according to claim 3, the fulcrum jig is arranged so that the horizontal member is orthogonal to the long hole of the punching sleeve body, and the engaging jig is used. The tip of the is inserted into the slot and rotated about 90 ° to engage the bulge with the slot. In this state, the tip can be inserted into the hole of the main body of the engaging jig, and the punching sleeve can be pulled out from the precast concrete panel with the horizontal member of the fulcrum jig as the fulcrum.

In the die-releasing jig for the punching sleeve according to claim 4 of the present application, the cylinder member is inserted into the elongated hole of the body of the punching sleeve and rotated by about 90 ° so that the protruding portion of the cylinder member has the above-mentioned length. Engage the holes. In this state, the second piston member is press-fitted to compress the air between the first piston member and the second piston member in the cylinder member. Due to the pressure of this air, a force that expands between the first piston member and the protruding portion of the cylinder member acts, and the punching sleeve can be pulled out from the prefabricated concrete panel.

In the demolding jig for the punching sleeve according to claim 5 of the present application, the elastic member of the tension member is compressed by aligning the projecting portion of the main body portion with the elongated hole of the punching sleeve main body. When the protrusion passes through the slot in the punching sleeve, the protrusion in the body engages with the slot in the punching sleeve by rotating the body about 90 °. If the compressive force on the elastic member is removed in this state, the repulsive force of the elastic member acts upward on the punching sleeve body, and the punching sleeve can be pulled out from the prefabricated concrete panel.

According to a sixth aspect of the present invention, there is provided a jig for releasing a hole punching sleeve, wherein the engaging member is aligned with the long hole of the hole punching sleeve body, inserted into the hole punching sleeve body, and rotated by about 90 °. The engaging member is engaged with the slot. By rotating the rod member in this state, a force for lifting the punching sleeve main body acts between the engaging member and the tip of the rod member, and the punching sleeve can be pulled out from the prefabricated concrete panel.

[0036]

EXAMPLE An example of a punching sleeve for a prefabricated concrete panel and a jig for removing the same according to the present invention will be described below.

FIG. 1 shows an embodiment of a punching sleeve for a prefabricated concrete panel according to the present invention.
Of these, FIG. 1 (a) is a vertical cross-sectional view of the entire punching sleeve of this embodiment, and FIG. 1 (b) is the bottom surface of the punching sleeve body viewed in the direction of arrow XX in FIG. 1 (a). FIG. 1 (c) shows the upper surface of the bottom plate of the punching sleeve as viewed in the direction of arrow Y-Y in FIG. 1 (a).

As shown in FIG. 1 (a), the punching sleeve 1 has a circular bottom plate 3 fixed to a base 2 for molding a prefabricated concrete panel, and an opening end portion where one end fits with the bottom plate 3. The main body 4 is formed and has a substantially cylindrical shape with the other end closed, and a through bolt 5 for fixing the bottom plate 3 and the main body 4 to the base 2.

As shown in FIG. 1 (b), the main body 4 has a long groove-shaped long hole 6 through which a through bolt 5 is inserted in the closed end surface of the top. On the other hand, the bottom plate 3 has a pair of bolt holes 7 for fixing the bottom plate 3 itself to the base 2, as shown in FIG. 1 (c).
And a through hole 8 through which the through bolt 5 penetrates.

The side peripheral surface 9 of the bottom plate 3 is formed as an inclined surface that spreads downward, as is apparent from FIG. 1 (a). The upper portion of the bolt hole 7 is widened so that the fixing bolt can be inserted easily. Further, the through hole 8 of the bottom plate 3 is formed in a mortar-shaped inclined surface 11 that guides the tip of the through bolt 5 into the bolt hole 10 of the base 2.

The inner peripheral surface 12 at the open end of the main body 4 is formed as an inclined surface that matches the inclined surface of the side peripheral surface 9 of the bottom plate 3. Further, the side peripheral surface 13 of the main body 4 is formed into an inclined surface that narrows downward so that it can be easily demolded. It is preferable that the main body 4 is integrally molded with an aluminum material.

In order to install the punching sleeve 1 having the above structure, the bottom plate 3 is placed on the base 2 and the pair of bolts 14 are attached.
Fixed by. The inclined surface of the bolt hole 7 is the bolt 1 described above.
4 to facilitate insertion. Next, the main body 4 is placed on the fixed bottom plate 3. At this time, the inner peripheral surface 1 of the open end of the main body 4
2 closely contacts the side peripheral surface 9 of the bottom plate 3 to determine the position of the main body 4. Next, the through bolt 5 is inserted into the elongated hole 6 and the tip portion is screwed into the bolt hole 10 of the base 2 to integrally fix the main body 4 and the bottom plate 3 to the base 2. At this time, the position of the bolt hole 10 of the base 2 cannot be confirmed from the outside, but the inclined surface 11 of the through hole 8 causes the tip portion of the through bolt 5 to move to the bolt hole 1 of the base 2.
Since it is guided to 0, threading of the through bolt 5 becomes easy.

As described above, the punching sleeve 1 is
The installation is easier than the conventional punching sleeve, which was difficult to install because the position of the bolt holes in the base could not be confirmed.

Next, the structure of the punching sleeve when the height is adjusted according to the thickness of the prefabricated concrete panel will be described. According to the punching sleeve of the present invention, the height of the punching sleeve is adjusted by placing a floor thickness adjusting lid for height adjustment on the upper portion of the punching sleeve body as shown in FIG. be able to.

In FIG. 2, the floor thickness adjusting lid 15 has an outer shape (circular in this case) that matches the top surface of the main body 4, and has a positioning projection 16 that is fitted into the elongated hole 6 of the main body 4 on the bottom surface. However, a through hole 17 for the through bolt 5 is provided at a position substantially vertically above the bolt hole 10 of the base 2.

A threaded surface is engraved on the upper end of the bolt 5. A nut 18 is pre-screwed on this threaded surface, and a washer 19 is provided between the adjustment lid 15 and the nut 18.

As shown in FIG. 2, the floor thickness adjusting lid 15 is placed on the top of the main body 4 of the punching sleeve 1, and the through bolt 5 is attached.
By integrally fixing the floor thickness adjusting lid 15 and the punching sleeve main body 4 with each other, the height of the punching sleeve 1 as a whole is increased, and a thicker prefabricated concrete panel can be molded.

If the floor thickness adjusting lid 15 is used, various kinds of floor thickness adjusting lids 15 having a standard height and a plurality of types of floor thickness adjusting lids 15 having appropriate thicknesses are prepared. Precast concrete panels with different thickness can be molded. As a result, the number of parts of the punching sleeve 1 can be reduced, and the manufacturing efficiency of the prefabricated concrete panel can be improved as a whole.

Next, a demolding jig for extracting the punching sleeve 1 from the molded prefabricated concrete panel and a method of using the jig will be described below.

FIG. 3 shows an embodiment of a demolding jig for the first punching sleeve according to the present invention. The demolding jig 20 for the punching sleeve comprises a fulcrum jig 21 and an engaging jig 22.

The fulcrum jig 21 of this embodiment has a handle 23.
And a long piece-shaped main body 2 connected to the central portion of the handle 23
4 and. The lower portion of the main body portion 24 has a narrow width, and the tip end portion thereof has a bulge portion 25 which engages with the elongated hole 6 by inserting it into the elongated hole 6 of the punching sleeve 1 and rotating it by about 90 °. Is provided. A plurality of engaging holes 26, which will be described later, are provided at appropriate positions on the main body 24.

On the other hand, the engaging jig 22 has a pair of leg portions 28 arranged on both sides of the punching sleeve 1 buried in the prefabricated concrete panel 27, and a pair of horizontal members 29 provided between the leg portions 28. Consists of. The horizontal member 29 of this embodiment is composed of a pair of parallel plate members, and both horizontal members 29 are arranged so that their heights are stepped.

To use the die-releasing jig 20 for the punching sleeve, the fulcrum jig 22 is arranged so that the horizontal member 29 is orthogonal to the long hole 6 of the punching sleeve 1, and the jig 22 for engagement is used. The tip of the jig 21 is inserted into the long hole 6 and rotated about 90 °. As a result, the swelling portion 25 of the fulcrum jig 21 has the long hole 6
Engage with.

Next, as shown in FIG. 4, the tip of the lever 30 is inserted into the engaging hole 26 of the engaging jig 21 and the other end of the lever 30 is provided with the horizontal member 29 of the fulcrum jig 22 as the fulcrum. Apply downward force F to. With this lever 30, a large force for lifting the punching sleeve 1 upward acts, and the punching sleeve 1 can be pulled out from the prefabricated concrete panel 27.

As is clear from the above description, the demolding work by the demolding jig 20 of this embodiment can be carried out from the upper surface of the prefabricated concrete panel 27. Therefore, the equipment for hoisting the prefabricated concrete panel 27 and the labor and time for hoisting are not required. Moreover, it is possible to safely work from the upper surface of the prefabricated concrete panel 27.

Further, since the punching sleeve 1 is not hit with a hammer or the like, the same punching sleeve can be repeatedly used for a long period without deforming the punching sleeve. In addition, the holes of the prefabricated concrete panel after being removed from the mold are less damaged, the time and effort for repairing can be saved, and a high quality prefabricated concrete panel can be obtained.

Further, since the inner peripheral surface 12 of the opening end of the main body 4 of the punching sleeve 1 is an inclined surface, less concrete adheres after demolding, and cleaning is easy in preparation for reuse. Is.

Next, another jig for releasing the punching sleeve will be described below.

Demolding jig 31 for the punching sleeve shown in FIG.
Is a cylinder member 33 having a protruding portion 32 that engages with the long hole 6 by being inserted into the long hole 6 of the punching sleeve 1 buried in the prefabricated concrete panel 27 and rotated about 90 °, and the cylinder member 33. And a second piston member 35 slidably provided at the upper end of the cylinder member.

In order to use the punching sleeve demolding jig 31 of this embodiment, first, the projection 32 of the cylinder member 33 is aligned with the long hole 6 of the punching sleeve 1, and then the projection 32 is formed. Is inserted into the punching sleeve 1 and rotated about 90 ° to engage the protrusion 32 with the slot 6.

Next, the second piston member 35 is pressed to compress the air between the first piston member 34 and the second piston member 35 in the cylinder member 33.

Due to the pressure of this air, a force for expanding between the first piston member 34 and the projecting portion 32 of the cylinder member 33 acts, and the punching sleeve 1 can be released from the precast concrete panel 27. .

The demolding of the punching sleeve by the demolding jig 31 is performed by the punching sleeve demolding jig 20 shown in FIG.
Similar to the above, it can be performed from the upper surface of the prefabricated concrete panel 27, and its operation and effect are the same as those of the demolding jig 20 for the punching sleeve of FIG.

Demolding jig 40 for punching sleeve shown in FIG.
Is a main body portion 42 having a projecting portion 41 which engages with the long hole 6 by being inserted into the long hole 6 of the punching sleeve 1 buried in the prefabricated concrete panel 27 and rotated about 90 °, and the main body portion 42. And a projecting member 44 resiliently provided in a nest shape by a spring 43 at the lower end of the. Spring 4
The elastic member 3 may be another elastic member such as rubber or air spring.

In order to use the above-mentioned punching sleeve demolding jig 40, first the protrusion 41 is formed on the punching sleeve 1.
The tension member 44 is inserted into the punching sleeve 1 so as to be aligned with the elongated hole 6 and the spring 43 is further compressed. Protrusion 4
After 1 passes through the long hole 6, the main body 42 is rotated about 90 ° as shown in FIG. 6 (a) to reduce the compressive force applied to the spring 43. As a result, the restoring force of the spring 43 acts upward on the punching sleeve 1. If the spring 43 has a predetermined strength or more, the punching sleeve 1 can be released from the prefabricated concrete panel 27 by the restoring force of the spring 43.

According to the tool 40 for removing the punching sleeve, the tool can be removed from the upper surface of the prefabricated concrete panel 27, and the work is safe and easy. The fact that the holes of the prefabricated concrete panel after molding are less damaged is the same as the demolding jig 20 of the punching sleeve of FIG.

Demolding jig 50 for punching sleeve shown in FIG.
Is an engaging member 51 that engages with the long hole 6 by inserting it into the long hole 6 of the punching sleeve 1 buried in the prefabricated concrete panel 27 and rotating about 90 °, and an engaging member 51 on the outer peripheral surface. And a rod member 52 having a screw to be screwed with.

Although the abutting member and the slide bearing are provided at the tip of the rod member 52 of this embodiment, these facilitate the abutment and rotation of the rod member 52 at the tip. Is not a requirement.

To use the punching sleeve demolding jig 50 of this embodiment, first, the engaging member 51 is aligned with the long hole 6 of the punching sleeve 1, and the engaging member 51 is punched. Insert it into the sleeve 1 for pulling and rotate it about 90 ° to make the long hole 6
Engage with.

Next, as shown in FIG. 7, the handle portion of the rod member 52 is rotated, and the tip end portion thereof is extended toward the bottom plate of the punching sleeve 1. If the rod member 52 is further rotated even after the tip end of the rod member 52 contacts the bottom plate of the hole punching sleeve 1, the hole punching sleeve 1 is formed between the engaging member 51 and the tip end of the rod member 52. The lifting force f acts and the punching sleeve 1 can be released from the prefabricated concrete panel 27.

The fact that the work is safe and easy, the damage to the punching sleeve is small, and the damage to the holes of the prefabricated concrete panel after demolding is small is that the demolding treatment of the punching sleeve in FIG. It is the same as the tool 20.

[0072]

As is clear from the above description, according to the punching sleeve of the prefabricated concrete panel and the jig for removing the same of the present invention, the inclined surface of the through hole of the bottom plate is formed by using the tip of the through bolt as the base. Since it is guided to the bolt hole, it is easy to install the sleeve for punching.

Further, since the prefabricated concrete panel of various thicknesses can be molded by the standard height punching sleeve by using the floor thickness adjusting lid together, the punching sleeve parts necessary for the molding can be formed. The number of points can be reduced and the precast concrete panel can be molded efficiently as a whole.

Further, by using the various demolding jigs of the present invention, the punching sleeve can be demolded from the upper surface of the horizontal prefabricated concrete panel, so that the work is safe and easy. Moreover, it is less likely to damage the punching sleeve and the prefabricated concrete panel.

Further, since the demolded piercing sleeve is easy to clean and the damage at the time of demolding is small, the piercing sleeve can be repeatedly used for a long period of time.

Due to the above effects, according to the punching sleeve for a prefabricated concrete panel and the demolding jig thereof of the present invention, the punching sleeve for a prefabricated concrete panel which is easy to install and demold with a small number of parts and The demolding jig can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view, a bottom view of a main body, and a plan view of a bottom plate of an embodiment of a sleeve for punching a prefabricated concrete panel according to the present invention.

FIG. 2 is a longitudinal sectional view of an embodiment of a punching sleeve 1 for a prefabricated concrete panel according to the present invention having a floor thickness adjusting lid.

FIG. 3 is a view showing a demolding jig for a punching sleeve of the present invention, which comprises a fulcrum jig and an engaging jig.

FIG. 4 is a diagram showing a method of using the demolding jig of the punching sleeve of the present invention, which comprises a fulcrum jig and an engaging jig.

FIG. 5 is a view showing a demolding jig for a punching sleeve of the present invention including a cylinder member and a piston member, and a method of using the jig.

FIG. 6 is a view showing a demolding jig for a punching sleeve of the present invention, which comprises a main body portion and a tensioning member elastically provided in a nested shape by an elastic member, and a method of using the jig.

FIG. 7 is a view showing a demolding jig for a punching sleeve of the present invention including an engaging member and a rod member, and a method of using the jig.

FIG. 8 is a longitudinal sectional view showing a conventional sleeve for punching a prefabricated concrete panel.

[Explanation of symbols] 1 sleeve for punching 2 base 3 bottom plate 4 main body 5 through bolt 6 long hole 7 bolt hole 8 through hole 9 side peripheral surface of bottom plate 10 base bolt hole 11 inclined surface 12 inside opening end of main body Peripheral surface 15 Floor thickness adjustment lid 16 Positioning protrusion 17 Through hole 20 Demolding jig for punching sleeve 21 Supporting jig 22 Engaging jig 24 Main body section 25 Bulging section 26 Engaging hole 28 Leg section 29 Horizontal member 30 Lever 31 Demolding jig for punching sleeve 32 Projection portion 33 Cylinder member 34 First piston member 35 Second piston member 40 Demolding jig for punching sleeve 41 Projection portion 42 Main body portion 43 Spring 44 Stretching member 50 Demolding jig for punching sleeve 51 Engaging member 52 Bar member

Claims (6)

[Claims] 1. A substantially cylindrical main body having a bottom plate fixed to a prefabricated concrete panel molding base, one end having a closed end surface, and the other end having an open end fitting with the bottom plate, and the cylindrical shape. A sleeve for punching a prefabricated concrete panel, which comprises a through bolt penetrating a closed end face of a main body, and a front end of the main body is screwed into a bolt hole of the base through the bottom plate to fix the main body on the bottom plate. The through hole for the through bolt of the bottom plate has an inclined surface that guides the tip end portion of the through bolt to the bolt hole of the base, and the side peripheral surface of the bottom plate is formed as an inclined surface that widens downward. The inner peripheral surface of the opening end of the main body is formed as an inclined surface that fits with the side peripheral surface of the bottom plate, and the closed end surface of the main body has a long groove-shaped long hole through which the through bolt is inserted. Pre-has characterized by Punching sleeve of the concrete panel. 2. A plate member which conforms to the shape of the main body and increases its height when it is superposed on the top of the main body, and has a positioning projection on the bottom surface which fits into an elongated hole of the main body. The sleeve for punching a prefabricated concrete panel according to claim 1, further comprising: a floor thickness adjusting lid having a through hole through which the through bolt passes. 3. A lever fulcrum comprising a pair of legs arranged on both sides of the punching sleeve according to claim 1, which is buried in a prefabricated concrete panel, and horizontal members provided between the legs. A jig and a plate member in the form of an elongated piece, and has a bulge portion at a tip end thereof which engages with the elongated hole by inserting it into the elongated hole of the punching sleeve and rotating it by about 90 °. A jig for demolding a punching sleeve of a prefabricated concrete panel, comprising: a lever engaging jig having at least one hole for engaging with the tip end portion in a portion. 4. The slotted hole of the punching sleeve according to claim 1, which is buried in a prefabricated concrete panel, and is inserted into the slotted hole.
A cylinder member having a protruding portion that engages with the elongated hole when rotated by 0 °; a first piston member slidably provided at an insertion end portion of the cylinder member into the punching sleeve; A second piston member slidably provided at an end portion of the member opposite to the insertion end portion and compressing air in a cylinder; Mold jig. 5. A slot for a punching sleeve according to claim 1, which is buried in a prefabricated concrete panel and is inserted into the slot for about 9 minutes.
A body portion having a protruding portion that engages with the long hole when rotated by 0 ° and an insertion end portion of the body portion into the punching sleeve are elastically and elastically provided in a nesting shape. A jig for demolding a punching sleeve of a prefabricated concrete panel, which comprises a projecting member. 6. A hole punching sleeve according to claim 1, which is submerged in a prefabricated concrete panel, and is inserted into the long hole to form about 9 holes.
For punching a prefabricated concrete panel, comprising: an engaging member that engages with the elongated hole when rotated by 0 °; and a bar member having an outer peripheral surface with a screw threaded with the engaging member. A jig for removing the sleeve.