JP2005273363A - Apparatus and construction method for forming core hole for supporting column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a construction method for forming a core hole, which make the core hole for supporting a balustrade column formed in PC-constructed and RC-constructed concrete structure. <P>SOLUTION: A core hole forming section bar 3, which is to be embedded in the concrete to be placed, is formed in a cylindrical shape or such a tapered cylindrical shape as to become narrower toward a bottom, a thread protrusion 5 with a great thread pitch is circumferentially provided on an outer peripheral surface 4 of the section bar 3, and the section bar 3 is embedded in the concrete. After the concrete is completely hardened, the section bar 3 is turned, separated and extracted from the concrete, so that the core hole for supporting the column can be formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a column support core hole forming apparatus for forming a core hole in advance in an independent pillar such as a square pipe or a round pipe on a concrete base manufactured by PC or RC. In addition, the present invention relates to a core hole forming method.

  Further, as a remarkable use example of the present invention, in order to form a core hole for supporting handrail struts in advance in a balcony handrail portion or a corridor handrail portion of a concrete structure manufactured by PC construction or RC construction. And a core hole forming method using the core hole forming apparatus.

  When handrails are installed on the balcony or corridor of a condominium, the support material for the handrails is pre-embedded with an anchor in the concrete structure and the lower part of the base material for the handrail post is welded to the anchor, or the concrete structure is cast into At the time of installation, a steel pipe called a sheath pipe was buried and covered, and after the concrete was hardened, the lid was removed to form a handrail post embedding hole.

  In the construction method, after welding the handrail strut to the anchor, the upper part of the anchor is finished with mortar or the like, and the handrail strut embedded in the handrail strut embedding hole formed by the sheath tube is filled with non-shrinkable concrete etc. A method of firmly fixing has been used.

  However, after the handrail column is erected, the mortar filling on the anchor and the non-shrinkable concrete filling work are carried out for 15 to 20 years due to the flooding from the mortar-filled part and the non-shrinkable concrete filled part. There is a drawback that the anchor and the sheath tube are corroded with the passage of time, and the rust is destroyed by the rust.

  For this reason, a utility model registration number No. 2596583 (hereinafter referred to as Patent Document 1) discloses a jig for forming a hole for embedding a column in a concrete structure.

  Patent Document 1 discloses an outer shape elastically deformable molding member corresponding to a predetermined burying hole, a shape retaining member that is fitted inside the molding member and has a rigidity strength that can resist concrete filling pressure, In the jig for forming a hole for embedding a pillar in a concrete structure including an upper lid fixed to an upper portion of the shape retaining member and provided with a grip portion, and a bottom lid for sealing a lower opening of the molding member. The member has a tapered shape in which the sectional opening shape decreases as the inner peripheral wall surface goes downward, and the shape retaining portion is a hollow member having a tapered surface along the inner peripheral wall surface of the molded member, The bottom lid has a connecting member provided with a screw groove at its tip standingly fixed, and the lid of the upper lid has a fitting hole into which the screw groove of the connecting member is inserted, and the lid is It is fixed to the molded member, and Is the formation jig holes for pillar embedded in the concrete structure, characterized in that arranged nut member screwed to the groove.

  Thus, the column-embedding hole forming jig disclosed in Patent Document 1 removes the forming frame after concrete hardening and removes the positioning auxiliary member, and then removes the nut member of the jig, Release the combined state of the lid and the shape retaining member.

  Then, when the grasping portion of the shape retaining member is grasped and pulled up, since the raised portion of the molded member portion is engaged with the recessed portion of the embedded hole, only this shape retaining member is removed, and the molded member is a structure. Will remain. At this time, the contact surfaces of both members are provided with a taper that tapers in the insertion direction, so that a strong pulling force is required only at the start of pulling, and the pulling operation can be easily performed.

  Next, attach the nut member to the connecting member of the bottom lid again, grasp the nut member and pull it up, or in some cases, hook the hook on the ring of the nut member to raise it, thereby elastically deforming the molded member However, the molded member can be easily extracted from the embedded hole.

  Thus, the outer shape elastically variable molding member in Patent Document 1 is rubber or synthetic rubber according to Japanese Utility Model Publication No. 8-6951 (hereinafter referred to as Patent Document 2) by the same applicant. It is clear without estimation.

  Both Patent Document 1 and Patent Document 2 were formed by forming a column-embedding hole in the concrete with the rubber of the molded member, then deforming the molded member of the rubber and extracting it from the solidified and cured concrete. Since metal objects such as anchors and sheath tubes do not remain in the holes for embedding pillars, for example, rusting due to rust caused by aging due to flooding over time occurs in concrete parts that are filled later for fixing handrail columns. There are big advantages such as no.

  However, the outer-shaped elastically variable molded member and the rubber outer cylinder described in Patent Document 1 and Patent Document 2 have poor peelability from concrete after solidification curing, and the rubber outer cylinder. Since the wall thickness is too thick, the peeling work from the concrete structure requires a strong pulling force at the start of pulling, and there is a case where it is finally plucked by a bar or the like, so that the working efficiency is very poor.

  In addition, the conventional examples of Patent Document 1 and Patent Document 2 are combined with a thick rubber outer cylinder and a steel cylinder body for practical use. It was not suitable for RC construction on site construction.

  Furthermore, in the conventional example of Patent Document 1, a bottom cover that seals the lower opening of the molded member is provided, a nut member is attached to a connecting member of the bottom cover, and the molded member is cured by grasping the nut member. In some cases, the molded member is pulled out from the embedded hole while elastically deforming the molded member by hooking a hook on the ring of the nut member and raising it.

  And since the bottom cover made of a plate material is attached to the lower opening of the variable molding member, when the portion is buried in the placed concrete and subjected to the filling pressure of the concrete, the mortar with a high moisture content In addition to intruding between the molded member and the shape-retaining member and solidifying, the removal of the shape-retaining member is also hindered, and the concrete is fixed as a solidified mortar on the molded member, the shape-retaining member and the bottom cover. Therefore, long-term repeated use becomes impossible.

Thus, the above-mentioned phenomenon is the same even in a structure in which a lower cover is placed under a cylinder and screwed as in Patent Document 2, and in the conventional example of Patent Document 2, an external material made of rubber or the like is used. The mortar-like concrete having a large amount of moisture that has entered the gap between the cylinders is solidified, making it difficult to remove the cylinders, and making the buried hole molding device impossible to be used repeatedly in a short period of time.
Utility Model Registration Gazette No. 2965583 No. 8-6951

  Thus, the problem to be solved by the present invention is a concrete portion that is filled later for fixing the column without leaving a metal object such as an anchor or a sheath tube in the core hole for supporting the column. It is an object of the present invention to provide a new column support core hole forming apparatus and a core hole forming method that do not cause rusting due to rust caused by water immersion over time.

  And, the pillar support core hole forming apparatus and the core hole forming method of the present invention are simple after the pillar support core hole forming apparatus is embedded at an arbitrary position in the concrete to be placed and the concrete is solidified and cured, In addition, the pillar supporting core hole forming apparatus can be easily peeled and removed from the concrete, and the work embodies an apparatus and method that does not require a strong force with a simple tool.

  The pillar support core hole forming apparatus of the present invention has a small number of parts and is a relatively lightweight member, which is sufficient as a core hole forming apparatus not only for the manufacture of PC structures in PC factories but also for on-site RC structures. An apparatus and method that can be used for the above are provided.

  In addition, the present invention eliminates the structure of the fitting part, the insertion part, etc. between the parts in the concrete embedding part of the core hole molding device, and the concrete enters and adheres between the parts, so that it cannot be used repeatedly. The present invention realizes an apparatus and method that can be used repeatedly and repeatedly over a long period of time.

  In the present invention, the core hole forming mold material embedded in the concrete to be cast is preferably a columnar shape or a cylindrical shape with a taper that narrows toward the bottom, and the outer periphery of the cylindrical core hole forming mold material. A thread protrusion with a large screw pitch is provided on the surface, the core hole forming mold is embedded in concrete, and after the concrete is completely cured, the cylindrical core hole forming mold is rotated and peeled off from the concrete. It is the support | pillar support core hole formation apparatus made into the structure removed.

  Thus, the core hole forming material is synonymous with the column member embedding hole forming member in the conventional example, but the core hole forming mold material of the present invention has a taper whose diameter gradually decreases in the downward direction. A cylindrical shape is preferable, and a thread projection having a large screw pitch is provided on the outer peripheral surface of the cylindrical shape.

  Further, the protrusion of the screw thread having a large screw pitch has a partial cross-sectional shape of a trapezoid like a screw screw, a mountain shape like a general screw, or a semicircular protrusion, and has a rough pitch in the tapered cylindrical shape. It is a shape in which a screw is screwed.

  Therefore, the core hole forming mold material consisting of a tapered cylindrical screw body is rotated from the concrete by rotating the cylindrical screw body so that the screw is reversely rotated and removed after the concrete is completely hardened. It is to be peeled and removed. After the removal, a cylindrical column support hole is drilled, and in the recessed shape part formed by the thread, a column is embedded in the column support hole, and mortar, synthetic When a filling material such as resin or non-shrinkable concrete is filled, the support material can be erected firmly because the filling material is hard to get into the concave portion.

  In the present invention, the core hole forming mold material embedded in the concrete to be cast is preferably a columnar shape or a cylindrical shape with a taper that narrows toward the bottom, and the outer periphery of the cylindrical core hole forming mold material. The surface is provided with a thread projection having a large screw pitch. The core hole forming mold is embedded in the concrete, and after the concrete is completely cured, the cylindrical core hole forming mold is rotated with a jig for rotation. A pillar support core hole forming method was proposed in which a pillar support core hole is formed in the hardened concrete by moving it off and removing it from the concrete so as to remove the screw.

  In the present invention, the core hole forming mold is preferably a cylindrical shape with a taper, a cup shape having an opening at the top and a bottom, and a screw having a large screw pitch is provided on the outer peripheral surface of the core hole forming mold. A protrusion is provided around the upper opening edge, and a rib for attaching an upper lid and a fitting rib for a detachable rotation jig are provided at the edge of the upper opening, and the cup-shaped bottom of the core hole forming mold material is a core hole forming mold material It was formed in a completely integrated shape with the outer periphery.

  That is, the core hole forming mold material is a cup-shaped body having an integrated bottom portion that does not leak water, and there is a portion where a mortar-shaped liquid with a lot of moisture invades even if buried in the cast concrete as in the conventional example. Absent. In addition, an attachment rib for attaching the upper lid and a fitting rib for removing and rotating the core hole forming mold material are provided in the opening in the upper part of the cylindrical shape.

  Furthermore, in the present invention, the core hole forming mold preferably has a cylindrical shape or a cylindrical shape with a taper that narrows toward the bottom, and has a cup shape having a bottom with an opening at the top. A thread protrusion having a large screw pitch is provided on the outer peripheral surface of the core hole forming mold material, and an upper lid mounting rib and a fitting rib for a removal rotating jig are provided on the upper opening edge, and the core The hole forming mold material has a structure in which a core hole formed to be buried in the concrete to be placed and a head continuously extending above the core hole forming allowance are provided.

  That is, as an example of the shape of the core hole forming mold material, a tapered cylindrical core hole forming mold material is provided with a head portion on the upper portion thereof, and a head portion provided on the upper portion of the core hole forming portion embedded in the concrete. It was proposed that even if the hole forming hole was buried in the concrete, it had a shape that could maintain the state of projecting outside from the concrete placement surface.

  Thus, in the present invention, it is preferable that the upper lid mounting rib provided at the upper opening edge of the core hole forming mold material is provided with a bolt screw hole for fixing the upper lid to the crown. did.

  In the present invention, preferably, the upper lid of the core hole forming mold material is provided with an angle-shaped fixing bracket capable of fixing the core hole forming mold material to the concrete mold material via a support arm. Then, the core hole forming mold material can be disposed at an arbitrary position and fixed to the concrete mold material, and concrete can be placed.

  Thus, in the present invention, it is preferable that the core hole forming mold material is manufactured by a lost wax method made of stainless steel.

  Furthermore, in the present invention, it is also preferable to manufacture the core hole forming mold material by a similar method such as aluminum casting, iron casting, synthetic resin molding, ceramic molding, gypsum casting, powder metallurgy method, and the like.

  In the present invention, when the core hole forming mold material is made of a metal such as stainless steel, aluminum, iron, etc., in the present invention, the outer peripheral surface of the core forming mold material that is embedded in the concrete is subjected to electrolytic polishing or the like to be hardened. It is preferable to have a shape that is easy to peel off and slide on the concrete.

The core hole forming mold material is a cylindrical or tapered columnar muku material, and a thread-shaped projection having a large screw pitch is provided around the outer periphery of the core hole forming mold material, and the upper end of the muck material The part may have a structure in which a mounting hole for fixing the core hole forming profile to the concrete frame and a hole for fitting a jig for removing the core hole forming profile from the hardened concrete are formed.
In this configuration, the core-forming mold material can be manufactured by cutting the stainless steel, aluminum, iron, or synthetic resin round bar material, and then performing a centering process if necessary.

  Further, in the present invention, the core hole forming mold material is configured as a screw body, and by rotating the core hole forming mold material, the bottom shape of the core hole forming mold material is removed from the hardened concrete. Is provided so as to project a substantially conical top shape so that when concrete is placed, the concrete can properly wrap around the bottom of the core hole forming material to form a good core hole.

  Thus, in the present invention, the metal cores such as anchors and sheath pipes are not left in the support core holes of the support columns, but the concrete portions that are filled later for fixing the support columns are flooded over time. It was possible to provide a new column supporting core hole forming apparatus and a core hole forming method that do not cause rust damage due to rust.

  Further, the pillar supporting core hole forming apparatus and the core hole forming method of the present invention are simple after the pillar supporting core hole forming apparatus is embedded at an arbitrary position in the concrete to be placed and the concrete is hardened and cured. In addition, the pillar supporting core hole forming apparatus can be easily peeled and removed from the concrete, and the work can be performed simply by rotating the core hole forming mold with a simple tool.

  Further, the support-supporting core hole forming apparatus of the present invention is a component including only a core hole forming mold material, and a fixture for fixing the core hole forming mold material to a concrete mold frame through an upper lid body and a lid body. Equipment and method that can be used as a core hole forming device for RC construction in field construction as well as manufacturing of PC construction in PC factories as a relatively lightweight member with fewer parts than equipment Was able to provide.

  Furthermore, the present invention eliminates the structure of the fitting part, the insertion part, etc. between the parts in the concrete embedding part of the core hole molding device, and the concrete enters and adheres between the parts, so that it cannot be used repeatedly. Thus, it was possible to provide an apparatus and a construction method that can be used repeatedly over a long period of time.

  In the present invention, the core hole forming mold material embedded in the concrete to be cast is a columnar shape or a cylindrical shape with a taper that narrows toward the bottom, and a screw pitch is formed on the outer peripheral surface of the cylindrical core hole forming mold material. The core hole forming mold material is embedded in the concrete, and after the concrete is completely cured, the cylindrical core hole forming mold material is rotated and peeled off from the concrete. This is a support-supporting core hole forming device.

  In the present invention, the core hole forming mold material embedded in the concrete to be cast is a columnar shape or a cylindrical shape with a taper that narrows toward the bottom, and a screw pitch is formed on the outer peripheral surface of the cylindrical core hole forming mold material. The core hole forming mold material is embedded in the concrete, and after the concrete is completely hardened, the cylindrical core hole forming mold material is rotated by a rotating jig and screwed. This is a pillar support core hole forming method characterized in that a pillar support core hole is formed in the hardened concrete by peeling off and removing from the concrete so as to be removed.

  The core hole forming mold material of the present invention is a columnar shape or a columnar shape with a taper that narrows toward the bottom, and has a cup shape with an opening at the top and a bottom. A screw thread projection having a large screw pitch is provided on the outer peripheral surface, and an upper lid mounting rib and a fitting rib for a removal rotation jig are provided on the upper opening edge, and the core hole forming mold cup is provided. It is the best mode that the shape bottom portion has a shape completely integrated with the outer peripheral portion of the core hole forming mold material.

  The core hole forming mold material of the present invention is a cylindrical shape or a cylindrical shape having a taper toward the bottom, and has a cup shape having an opening at the top and a bottom, and the core hole forming mold material has a large screw pitch on the outer peripheral surface. A thread projection is provided around the upper opening edge, and an upper lid mounting rib and a fitting rib for a removal rotation jig are provided on the edge of the upper opening. The best mode is to provide a core hole forming portion to be buried and a continuously extending head at the top of the core hole forming portion.

  Further, the upper lid mounting rib provided at the edge of the upper opening of the core hole forming mold according to the present invention is provided with a bolt screwing hole for fixing and fixing the upper lid.

  Furthermore, according to the present invention, the upper lid of the core hole forming mold material is provided with an angle-shaped fixing bracket capable of fixing the core hole forming mold material to the concrete mold material via a support arm.

  Thus, in the present invention, the core hole forming mold material is manufactured by a lost wax method made of stainless steel, or the core hole forming mold material is made of aluminum casting, iron casting, synthetic resin molding, ceramic molding, gypsum casting, powder It is the best form to manufacture by a similar method such as metallurgical method.

  When the core hole forming mold material is made of the above-mentioned metal such as stainless steel, aluminum, iron, etc., the outer peripheral surface of the core forming mold material that is embedded in the concrete and in contact with the concrete is subjected to electrolytic polishing or the like to hardened concrete. On the other hand, the shape was peeled off and slid easily.

  Further, as an embodiment of the present invention, the core hole forming mold material is a cylindrical shape or a cylindrical mug material with a taper that narrows toward the bottom, and a thread having a large screw pitch is formed on the outer peripheral surface of the core hole forming mold material. Protrusions are provided around the upper end of the lug material, and the fixing hole for attaching the core hole forming shape to the concrete frame, and for removing the core hole forming shape from the cured concrete. It was proposed that a hole for rotating jig fitting was drilled.

  And in order to embody the said Example, it proposed that the said core formation mold material was cut out from the round bar material of the said stainless steel, aluminum, iron, and a synthetic resin, and it gave a half-grind process as needed.

  Further, in the present invention, the bottom shape of the core hole forming mold material is provided by protruding a substantially conical piece, and when the concrete is placed, the concrete properly wraps around the bottom portion of the core hole forming material to form a good core hole. A possible configuration is proposed, and the configuration can be arbitrarily adopted.

  FIG. 1 is an explanatory side sectional view showing Embodiment 1 of the present invention, FIG. 2 is an explanatory view showing a plan view of FIG. 1, and FIG. 3 is for removing a core forming mold embedded in the concrete after curing and curing from the concrete. It is a figure explaining the relationship between a jig | tool and a core formation mold material.

  1 to 3, 1a, 1b, and 1c are concrete mold materials, 2a and 2b are reinforcing bars arranged in the mold materials, 3 is a core hole forming mold material, and 4 is an outer periphery of the core hole forming mold material 3 The surface 5 is a thread projection provided on the outer peripheral surface 4 of the core hole forming profile 3, 6 is the bottom of the core hole forming profile 3, 7 is an opening provided at the top of the core hole forming profile 3, 8a 8b and 8c respectively indicate rib protrusions provided on the edge of the opening 7.

  Thus, the rib protrusions 8a, 8b, 8c are formed with fixing bolt holes 10a, 10b, 10c of the upper lid 9 which is crowned on the opening 7, and the rib protrusions 10a, 10b, 10c are shown in FIG. As shown in FIG. 3, the core hole forming die 3 has a shape that allows the removal rotation jig 17 to be fitted from the concrete embedding surface 11 to be fitted.

  Further, the bolts 12a, 12b, 12c screwed into the bolt holes 10a, 10b, 10c can integrally fix the upper lid 9 to the core hole molding material 3, and can be arbitrarily attached / detached.

  The upper lid 9 that can be integrated with the core hole forming material 3 is connected to the upper lid 9 and the core hole forming mold material 3 at an arbitrary position of the concrete frame material 1a via an upper cover support arm 13 that is rotatable with respect to the upper cover 9. The angle-shaped fixing bracket 14 is fixed to the fixed frame 15.

  Thus, as the rotation jig 17 in the present invention, the one shown in FIG. 3 is used. In FIG. 3, the core forming mold 3 embedded in the concrete 16 has the concrete mold materials 1a, 1b and 1c shown in FIG. 1 removed after the concrete is hardened, and at the same time, the upper lid 9, the upper lid supporting arm, the angle The fixed frame 14 is also removed.

  Accordingly, in FIG. 3, the opening 7, rib protrusions 8a, 8b and 8c of the core forming mold 3 and the bolt holes 10a, 10b and 10c for fixing the upper lid formed in the rib protrusions 8a, 8b and 8c can be seen.

  A removal rotation jig 17 for removing the core hole forming mold 3 disposed to face the upper portion of the opening 7 of the core hole forming mold 3 has concave grooves 18a, 18b, 18c inserted into the rib protrusions 8a, 8b, 8c. When the fitting member 19 and the hook 20 are engaged with the hook 20 and the rod-shaped tool 21 capable of applying a rotational force to the core forming mold material 3 is applied, the rotating force is applied to the core forming mold material 3. The core forming mold 3 can be easily peeled off and removed from the concrete 16, and a core hole for standing upright can be formed later.

  Thus, in the first embodiment, the core hole molding die 3 is installed and fixed in the concrete mold materials 1a, 1b, 1c on which the reinforcing bars 2a, 2b are laid, and then the concrete 16 is placed in FIG. FIG. 2 shows this.

  In the first embodiment, the core hole forming mold 3 embedded in the concrete 16 to be cast is a cylindrical column with a taper, and the outer peripheral surface 4 of the cylindrical core hole forming mold 3 has a screw pitch. A large thread projection 5 is provided around the core hole forming mold 3 in the concrete 16, and after the concrete is completely cured, the cylindrical core hole forming mold 3 is rotated and peeled off from the concrete embedding surface 11. It is the support | pillar support core hole formation apparatus made into the structure pulled out.

  Further, in the first embodiment of the present invention, the core hole forming mold 3 embedded in the concrete 16 to be cast is a cylindrical column with a taper, and the outer peripheral surface 4 of the cylindrical core hole forming mold 3 is formed on the outer peripheral surface 4. A thread protrusion 5 having a large screw pitch is provided around the core hole forming mold material 3 and embedded in the concrete 16. After the concrete is completely cured, the cylindrical core hole forming mold material 3 is removed and the rotation jig 17 is removed. It was possible to propose a column support core hole forming method in which a column support core hole is formed in the hardened concrete 16 by removing the screw by removing it from the concrete 16 by rotating.

  Further, in the first embodiment, the core hole forming mold material 3 is a cylindrical shape with a taper and has a cup shape having an opening 7 at the top and a bottom portion 6. The outer peripheral surface 4 of the core hole forming mold material 3 has a screw pitch. A large thread protrusion 5 is provided around the upper opening edge 3 and an upper lid mounting rib protrusion 8a, 8b, 8c and a removal rotation jig that also serves as the rib protrusion 8a, 8b, 8c are fitted. The combination ribs 8 a, 8 b, and 8 c are provided, and the cup-shaped bottom portion 6 of the core hole forming mold material 3 is configured to be completely integrated with the outer peripheral surface 4 of the core hole forming mold material 3.

  Thus, the core hole forming mold 3 used in the first embodiment of the present invention is a cylindrical shape or a cup-shaped material that narrows toward the bottom as shown in FIG. 1, and the shaped object is a lost wax method made of stainless steel. It is best to manufacture the core hole forming mold material 3 by an aluminum casting, iron casting, synthetic resin molding, ceramic molding, gypsum casting, powder metallurgy, etc. The outer peripheral surface 4 of the core-forming mold 3 made of a metal such as aluminum or iron is subjected to electrolytic polishing or the like, and the core-shaped molding material 3 is applied to the concrete 16 after curing. The core hole for standing upright can be easily and easily formed in the concrete structure by peeling off from the concrete 16 by rotating and making it easy to slide.

Example 2 is an example of the shape of the core hole forming mold 3 shown in FIGS. 4 and 5, FIG. 4 is a side view showing Example 2, and FIG. 5 is an explanatory view showing the plane of FIG. 4.
4 and 5, the same reference numerals as those in FIGS. 1 to 3 denote the same components, 3 is a core hole forming mold material, 4 is the outer peripheral surface of the core hole forming mold material 3, and 5 is 4 on the outer peripheral surface. Threaded protrusions provided around the periphery, 6 is a bottom portion of the core hole forming mold member 3, 7 is an opening of the core hole forming mold member 3, and 8a, 8b and 8c are rib protrusions.

  Thus, the core hole forming mold 3 has a cylindrical shape with a taper and a cup shape having an opening 7 at the top and a bottom 6. The thread protrusion 5 having a large screw pitch is formed on the outer peripheral surface of the core hole forming mold. Around the upper opening 7 edge, fitting rib protrusions 8a, 8b, and 8c of a removing rotation jig 17 that is also used as an upper lid mounting rib are provided.

  The core hole forming mold 3 according to the second embodiment is provided with a core hole forming margin 22 buried in the concrete to be placed and a column supporting core provided with a head 23 extending continuously above the core hole forming margin 22. A hole forming device was constructed. By providing the head 23 with a dimensional margin so as to protrude from the concrete embedding surface 11, the core hole forming mold 3 can be easily handled in the field, and the core hole forming profile 3 can be removed from the concrete. The mold became easier.

  Further, the core hole forming mold material 3 used in Example 2 is manufactured by a lost wax method made of stainless steel as in Example 1, or the core hole forming mold material 3 is formed by aluminum casting, iron casting, synthetic resin molding. It is the best form to manufacture by similar methods such as ceramic molding, gypsum casting, powder metallurgy.

  Of the above manufacturing methods, the outer peripheral surface 4 of the core-forming mold 3 manufactured by a metal such as stainless steel, aluminum, or iron is subjected to electrolytic polishing or the like, and the concrete 16 after hardening is cured. In contrast, by rotating the core-shaped molding material 3 from the inside of the concrete 16 and making it easy to slide, it is possible to easily and easily form a core hole for standing upright in the concrete structure. .

Further, as a practical example of the present invention, the core hole forming mold material 3 is made of a cylindrical columnar material with a taper, and the material is made of the above round rod material made of stainless steel, aluminum, iron or synthetic resin. It is also possible to embody, and to manufacture by applying a centering process if necessary, and the shape of the bottom 6 of the core hole forming mold material 3 in the present invention is provided by projecting a substantially conical piece, A configuration is proposed in which the concrete 16 can properly wrap around the bottom portion 6 of the core hole forming material 3 to form a good core hole during placement, and the configuration can be arbitrarily adopted.
Is possible.

  Thus, according to the present invention, the core hole forming mold material 3 embedded in the concrete to be cast is a columnar shape or a cylindrical shape with a taper that becomes narrower toward the bottom portion 6. A screw thread projection 5 having a large screw pitch is provided on the outer peripheral surface 4 of the steel plate. The core hole forming mold material 3 is embedded in the concrete 16 and the concrete core is completely cured and the cylindrical core hole forming mold material 3 is rotated. Then, the pillar support core hole is formed by peeling and removing from the concrete.

  And since the core hole does not leave a metal shaped object such as an anchor or a sheath tube, the concrete part to be filled later for fixing a pillar such as a handrail does not cause rusting due to rust caused by water aging. A core hole forming apparatus and a core hole forming method for supporting pillars are provided, and their industrial utility value is great.

It is side sectional explanatory drawing which shows Example 1 of this invention. It is explanatory drawing which shows the plane of FIG. It is explanatory drawing of the jig | tool for the removal rotation of a core shaping | molding die material. It is a side view which shows Example 2 of this invention. It is explanatory drawing which shows the plane of FIG.

Explanation of symbols

1a, 1b, 1c Concrete mold material 2a, 2b Reinforcing bar 3 Core hole forming mold material 4 Outer peripheral surface 5 Thread projection 6 Bottom portion 7 Opening 8a, 8b, 8c Rib projection 9 Top lid 10a, 10b, 10c Bolt hole 11 Concrete embedding surface 12a , 12b, 12c Bolt 13 Upper lid support arm 14 Angle fixing bracket 15 Angle fixing frame 16 Concrete 17 Removal rotation jig 18a, 18b, 18c Recess groove 19 Fitting member 20 Hook 21 Rod tool 22 Core hole forming margin 23 Head

Claims (12)

  The core hole forming mold embedded in the concrete to be cast is a cylinder or a cylindrical cylinder with a taper that narrows toward the bottom, and a screw thread having a large screw pitch is formed on the outer peripheral surface of the cylindrical core hole forming mold. Protrusions are provided around, and the core hole forming mold material is embedded in the concrete, and after the concrete is completely hardened, the columnar core hole forming mold material is rotated and peeled off from the concrete and extracted. Core hole forming device.   The core hole forming mold embedded in the concrete to be cast is a cylinder or a cylindrical cylinder with a taper that narrows toward the bottom, and a screw having a large screw pitch is formed on the outer peripheral surface of the cylindrical core hole forming mold. Convex protrusions are provided around the core, and the core hole forming mold is embedded in the concrete. After the concrete is completely cured, the cylindrical core hole forming mold is rotated by a rotating jig to remove the screw. A pillar support core hole forming method characterized in that a pillar support core hole is formed in the hardened concrete by further peeling and removing.   The core hole forming mold material is a cup shape having a cylindrical shape or a tapered cylindrical shape that tapers toward the bottom, and has an opening at the top, and a screw pitch is formed on the outer peripheral surface of the core hole forming mold material. A large thread protrusion is provided around the upper opening edge, and a rib for attaching the upper lid and a rib for fitting the removing rotation jig are provided at the edge of the upper opening, and the cup-shaped bottom portion of the core hole forming mold material is a core hole. 3. The support hole supporting core hole forming apparatus or core hole forming method according to claim 1, wherein the forming hole is formed in a completely integrated shape with the outer periphery of the forming mold member.   The core hole forming mold material has a cup shape with a cylindrical shape or a tapered cylindrical shape that tapers toward the bottom and has an opening at the top, and the core hole forming mold material has a large screw pitch on the outer peripheral surface. A thread-shaped projection is provided around the top opening edge, and an upper lid mounting rib and a fitting rib for removing the rotation jig are provided at the upper opening edge, and the core hole forming mold material is cast concrete 4. A support-supporting core hole forming apparatus or a core hole according to claim 1, wherein a core hole forming margin buried in the core hole and a head portion extending continuously above the core hole forming margin are provided. Forming method.   5. A handrail according to claim 1, wherein a bolt screwing hole for fixing and fixing the upper lid is provided in an upper lid mounting rib provided at an upper opening edge of the core hole forming mold material. Column support core hole forming device or core hole forming method.   6. The support column according to claim 1, wherein an angle-shaped fixing bracket capable of fixing the core hole forming mold material to a concrete mold frame member is provided on an upper lid of the core hole forming mold material via a support arm. Support core hole forming device or core hole forming method.   7. The support hole supporting core hole forming apparatus or the core hole forming method according to claim 1, wherein the core hole forming mold material is manufactured by an appropriate method such as a lost wax method made of stainless steel.   The core hole forming mold material according to claim 7, wherein the core hole forming mold material is manufactured by aluminum casting, iron casting, synthetic resin molding, ceramic molding, gypsum casting, powder metallurgy method or similar method. Equipment or core hole formation method.   When the core hole forming mold material is made of metal such as stainless steel, aluminum, iron, etc., the outer peripheral surface of the core forming mold material that is embedded in the concrete and touches the concrete is peeled off from the hardened concrete by electrolytic polishing or the like. 9. The support-supporting core hole forming apparatus or core hole forming method according to claim 1, wherein the core hole forming apparatus or the core hole forming method has a shape that is easy to slide.   The core hole forming mold material is a columnar or a cylindrical muck material having a taper that narrows toward the bottom, and a thread protrusion having a large screw pitch is provided around the outer peripheral surface of the core hole forming mold material. At the upper end of the Muku material, there are holes for mounting the core hole forming profile to the concrete frame and a fitting hole for a rotating jig for removing the core hole forming profile from the hardened concrete. 11. The support hole supporting core hole forming apparatus and the core hole forming apparatus or core hole forming method according to claim 1, wherein the supporting hole supporting core hole forming apparatus is provided.   11. The column support according to claim 1, wherein the core hole forming mold material is cut out from the stainless steel, aluminum, iron, or synthetic resin round bar material, and is subjected to a medium grind processing as necessary. Core hole forming device or core hole forming method.   12. The support hole supporting core hole forming apparatus or the core hole forming method according to claim 1, wherein a bottom shape of the core hole forming mold material is provided so as to protrude into a substantially conical frame shape.

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