JP3725874B2 - Core hole forming apparatus for supporting handrail support and core hole forming method - Google Patents

Description

[0001]
The present invention relates to a core hole forming apparatus and a core hole forming method for forming a core hole for supporting a handrail in advance in a balcony handrail part, a corridor handrail part, etc. of a concrete structure manufactured by a PC structure or an RC structure. is there.
[0002]
[Prior art]
When handrails are installed on the balcony or corridor of an apartment building, the support material for the handrails is pre-embedded with an anchor in the concrete structure, and the lower part of the handrail support material is welded to the anchor, or the concrete structure is cast into concrete. At the time of installation, a steel pipe called a sheath pipe was buried and covered, and after curing the concrete, the lid was removed to form a handrail strut embedding hole.
[0003]
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.
[0004]
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.
[0005]
For this reason, a device for forming a buried hole for a handrail post proposed in Japanese Utility Model Publication No. 8-6951 has been proposed. In the above-mentioned device, it is composed of a metallic hard cylinder, an upper lid attached to the upper part thereof, and an elastic outer cylinder made of rubber or the like to be fitted on the outer side of the cylinder, and the upper lid is connected to the handle and the outer cylinder. A spring to be joined is provided, and a raised portion is appropriately projected on the side surface of the outer cylinder.
[0006]
The outer cylinder is made of an elastic material such as rubber and can be changed.However, the outer cylinder cannot be deformed by inserting a metal cylinder, and the outer cylinder inserted into the cylinder is An upper cover spring fastened with screws is provided, and a protrusion is appropriately provided on the side of the outer cylinder.
[0007]
Therefore, in the above-described conventional example, a metal cylinder is inserted into a rubber outer cylinder, placed at a position where a buried hole is formed, and concrete is poured. After curing the concrete, if you grasp the handle of the top lid and pull the cylinder upward, the cylinder can be pulled out lightly without resistance, and the outer cylinder from which the cylinder has been pulled out can be deformed and removed from the buried hole. Since it is easy to pull out and only the burial hole of the handrail that does not leave a metal shaped object such as an anchor or a sheath tube is formed later, the handrail post is installed in the burial hole and used for fixing concrete etc. The filler was packed and the handrail post was fixed.
[0008]
Thus, in the cited conventional example, there is no metal shape such as an anchor or a sheath tube remaining in the core hole for supporting the handrail strut, so the concrete portion to be filled later for fixing the handrail strut However, the rubber outer cylinder is poorly peelable from the concrete after curing, and the rubber outer cylinder is thick. For this reason, the peeling work from the concrete structure is a prying work with a bar or the like, and the working efficiency is poor.
[0009]
In addition, the conventional equipment combines a thick rubber outer cylinder and a steel cylinder for practical use, and is heavy, making it a PC structure in a PC factory. There wasn't.
[0010]
[Problems to be solved by the invention]
Thus, the present invention eliminates the above-mentioned drawbacks, provides a peelable member having good peelability from the concrete after curing, and a shape of a peelable member having good peelability, and by combining the peelable member and the sheath tube, It is an object of the present invention to provide a new core hole forming apparatus and core hole forming method for supporting handrail struts.
[0011]
[Means for Solving the Problems]
In the present invention, the peeling member that comes into contact with the placed concrete and peels off after curing the concrete is in a folded bag shape, and the bag-shaped peeling member is made of a plastic molding material having an internal stress that is always folded, The folded release member is expanded into a bag shape, and a sheath tube that can be inserted from the opening is fitted and fixed to form a cylindrical core hole forming body. The core hole forming body is integrated with the upper portion of the sheath tube. A lid having positioning bolts provided is provided, the core hole forming body is set at an arbitrary position before placing the concrete, and the core hole forming body is provided at the lid of the sheath tube for positioning and fixing. A core hole formed after fixing the concrete formwork using positioning bolts, placing the concrete on the concrete formwork, drawing the sheath tube after the concrete is cured, and drawing the sheath pipe More bags It could provide handrail posts supporting a core hole forming apparatus and the core holes formed construction method is characterized in that removal in the manner folding the peeling member.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described based on an example with reference to FIGS.
FIG. 1 to FIG. 3 are perspective explanatory views showing the shape of each part of the sequence of steps for assembling the core hole forming body of the present invention. In FIG. 1, reference numeral 1 denotes a peeling member and a sheath tube formed of a plastic molding material. Shown separately.
[0013]
The shape of the peeling member 1 in FIG. 1 is formed so that the internal stress of many plastics is not corrected at the time of molding, and is formed as a peeling member 1 so that the whole is left folded, and it is also compact at the time of transportation. A shape that can be packed and transported is formed.
[0014]
Further, the peeling member 1 is in contact with the concrete placed on the outside thereof, and is left in the concrete during the curing period of the concrete, but since the smoothness of the outer surface is good and moisture is repelled and does not take moisture, An ideal peeling member 1 is obtained.
[0015]
Furthermore, plastic is excellent in that it can be molded thin and light from 1.0 mm to 2.0 mm even in the molding of the peeling member 1, and in particular, polypropylene has a repeated bending strength at the folding parts 2 and 3. Since it is excellent, it is the most suitable material for the peeling member 1 among existing plastics.
[0016]
The shape of the peeling member 1 is a bag shape having an opening 4 and a base 5 when expanded, and the edge 6 is formed thicker than the other parts, and a fixing rod 7 is inserted under the edge 6. Pin holes 8a and 8b are formed for this purpose. When the bottom portion 5 is folded, the bottom portion 5 has a protruding shape so that the folding margin protrudes and assists the separation from the concrete. The shape of the bottom portion 5 is peeled as shown in FIG. When the member 1 is expanded, it appears as a rectangular taper shape 9.
[0017]
Thus, the sheath tube 10 in FIG. 1 is a shape formed of an aluminum pipe or an aluminum plate material, and a lid body 11 formed of a plate material is integrated with the sheath tube 10 at the upper portion of the sheath tube 10. A positioning bolt 12 is implanted in the lid body 11.
Reference numerals 13a and 13b shown in FIG. 1 denote fixing through holes formed in the side wall of the lid 11, and the fixing rod 7 is inserted together with the pin holes 8a and 8b formed in the peeling member 1 to be peeled off. The member 1 and the sheath tube 10 are fixed and integrated.
[0018]
FIG. 2 shows a state in which the peeling member 1 is prepared to be fitted and fixed to the sheath tube 10 by expanding the opening 4 of the bag-shaped product that is always folded. Has a substantially quadrangular or substantially rectangular bag shape, and the size is designed assuming the size and depth of the core hole formed in advance.
[0019]
3 shows a state in which the sheath tube 10 is inserted into the peeling member 1 whose opening 4 is expanded in FIG. 2, and in FIG. Is inserted as an aggregate to constitute a core hole forming body 14 that can sufficiently withstand the filling pressure when casting concrete.
[0020]
The core hole forming body 14 is detachable by expanding the peeling member 1 in a bag shape and inserting a sheath tube 10 into which the peeling member 1 can be inserted from the opening 4 and inserting the fixing rod 7 between the peeling material 10 and the sheath tube 11. Is integrated. The core hole forming body 14 has a positioning bolt 12 planted on the top of the lid 11 of the sheath tube 10. A washer 15 is fitted to the positioning bolt 12, and a nut 16 is screwed to a concrete formwork. (Not shown) is prepared to be fixable.
[0021]
Thus, FIG. 4 is a perspective explanatory view for explaining how the core hole forming body 14 of the present invention is arranged in the PC and RC concrete structures to form the core hole. , 18 and 19 are molds for manufacturing a rising part of a balcony or a corridor handrail with a concrete structure, and an angle member 21 having a sliding groove 20 is mounted on the upper parts of the molds 17 and 18.
[0022]
The angle member 21 can be fixed at an arbitrary position by fastening a bolt 23 and a nut 24 (not shown) to the edges of the molds 17 and 18 by a clip material 22 formed of a flat bar or the like. The core hole forming body 14 performs the first concrete placement A1 portion in the molds 17, 18 and 19, and the core hole forming body 14 is arranged at the set depth of the core hole forming body 14 and the pitch pitch interval of the handrail. (FIG. 4 shows only one location), and the core hole forming body 14 is engaged with the angle member 21 using the positioning bolts 12 implanted in the lid body 11 to adjust the front, rear, left and right respectively. The core hole forming body 14 is fixed to the mold frames 17 and 18 by fastening the nuts 16 and 24, and then the finished concrete A2 portion is placed.
[0023]
Thus, in the present invention, after the cast concrete A1 and A2 are cured, the angle member 12 is removed from the molds 17 and 18, and the sheath tube 10 is pulled out from the core hole forming body 14, and then the concrete is obtained. Since the peeling member 1 remains in the core hole formed in the inside and the peeling member 1 has an internal stress that is always folded, the original folded shape is restored in the core hole. If the peeling member 1 is peeled from the concrete surface in the core hole or the edge 6 of the peeling member 1 is slightly deformed, it can be easily removed from the peeling member 1 through the core hole, and later anchor or sheath A core hole that does not leave a metal shaped object such as a tube can be formed, and a handrail strut can be formed in the core hole and filled with non-shrinkable concrete to support the handrail strut that can withstand longer aging and does not break down the frame. Core hole can be formed .
[0024]
【The invention's effect】
In the present invention, the peeling member 1 that comes into contact with the placed concrete and is peeled after curing is always in a folded bag shape, and the plastic molding material having an internal stress such that the bag shaped peeling member 1 is always folded. The folded peeling member 1 is expanded into a bag shape, and a sheath tube 10 that can be inserted from the opening 4 is fitted and fixed to form a cylindrical core hole forming body 14. A lid 11 having positioning bolts 12 provided integrally on the sheath tube 10 is provided, and the core hole forming body 14 is set at an arbitrary position before finishing concrete placement, and the core hole forming body The positioning bolts 12 provided on the lid 11 of the sheath tube 10 are used for positioning and fixing to the concrete molds 17, 18, 19, and the concrete is cast on the concrete molds 17, 18, 19. Shi A device for forming a core hole for supporting a handrail strut by pulling out the sheath tube 10 after the concrete is cured and removing the bag-shaped peeling member 1 from the core hole formed after the sheath tube 10 is pulled out. And a core hole forming method was provided.
[0025]
The present invention can easily and easily pull out the sheath tube 10 and the peeling member 1 from a cured concrete structure, and in particular, is a plastic peeling member that comes into contact with the placed concrete and peels from the concrete after a curing period. 1 is that the peeling member 1 has a smooth outer surface, repels moisture, and does not absorb moisture. Therefore, the peeling member 1 is easy to peel off from concrete, and maintains a stress such that the peeling member 1 is always folded. When the sheath tube 10 is pulled out, it returns to its original shape, so that the peeling member 1 can be easily peeled off from the core hole formed in the concrete, so that the core hole forming operation can be performed efficiently.
[0026]
Further, in the present invention, the plastic release member 1 is lightweight and is a molded body in which the original shape is folded, so that it can be efficiently transported and packaged to a PC manufacturing factory or site, This advantage can be obtained more significantly by making the sheath tube 10 of an aluminum material and reducing the weight.
[0027]
Thus, according to the present invention, the core hole in which the metal shape such as the anchor and the sheath tube does not remain in the concrete structure of the PC structure and the RC structure with the above-described efficient structure is simple and easy. Can be formed.
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view illustrating components of a core hole forming body.
FIG. 2 is a perspective view for explaining a core hole forming body.
FIG. 3 is a perspective explanatory view showing the shape of a core hole forming body.
FIG. 4 is a perspective explanatory view showing a state in which a core hole forming body is arranged in a PC or RC concrete structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Separation member 2, 3 Folding part 4 Opening part 5 Bottom part 6 Edge part 7 Adhering rod 8a, 8b Pin hole 9 Tapered shape 10 Sheath pipe 11 Lid 12 Positioning bolt 13a, 13b Adhering through hole 14 Core hole forming body 15 Washer 16 Nut 17, 18, 19 Mold 20 Slide groove 21 Angle member 22 Clip material 23 Bolt 24 Nut
A1 First concrete placement
A2 Finishing concrete placement

Claims (8)

The peeling member that comes into contact with the placed concrete and is peeled off after curing is always in a folded bag shape. The peeling member is expanded in a bag shape, and a sheath tube that can be inserted from the opening is fitted and fixed to form a cylindrical core hole forming body, and the core hole forming body is provided integrally with the upper portion of the sheath tube. A lid having a bolt is provided, the core hole forming body is set at an arbitrary position before placing concrete, and a positioning bolt provided on the lid of the sheath tube is used for positioning and fixing the core hole forming body. Fixed to a concrete formwork,
A core hole forming device for supporting a handrail post. The peeling member that comes into contact with the concrete to be placed and peels off after curing the concrete is always in a folded bag shape. The peeling member was expanded into a bag shape and a sheath tube that can be inserted from the opening was fitted and fixed to form a cylindrical core hole forming body, and the core hole forming body was provided integrally with the upper portion of the sheath tube A lid having positioning bolts is provided, the core hole forming body is set at an arbitrary position before placing concrete, and positioning bolts provided on the lid of the sheath tube are used for positioning and fixing the core hole forming body. Use to fix to concrete formwork material, place concrete on the concrete formwork material, pull out the sheath tube after the concrete is cured, peel off the bag shape from the core hole formed after drawing the sheath tube Part Be removed in the manner folding,
A core hole forming method for supporting handrail struts. The core hole forming apparatus for supporting a handrail strut according to claim 1, wherein polypropylene is used as a plastic molding material of the bag-shaped peeling member. The core hole forming method for handrail struts according to claim 2, wherein polypropylene is used as a plastic molding material for the bag-shaped release member. Configuring the shape of the bottom of the bag-shaped peeling member into a slight quadrangular pyramid shape projecting to the outside;
  The core hole forming device for supporting a handrail post according to claim 1. Configuring the shape of the bottom of the bag-shaped peeling member into a slight quadrangular pyramid shape projecting to the outside;
  The core hole forming method for supporting a handrail post according to claim 2. When the folded release member is expanded into a bag shape and a sheath tube is fitted and fixed from the opening to form a cylindrical core hole forming body, the means for fixing the release member and the sheath tube is the release member and the sheath tube. It is made by inserting a fixing rod into a pin hole penetrating through,
  The core hole forming device for supporting a handrail post according to claim 1. When the folded release member is expanded into a bag shape and a sheath tube is fitted and fixed from the opening to form a cylindrical core hole forming body, the means for fixing the release member and the sheath tube is the release member and the sheath tube. It is made by inserting a fixing rod into a pin hole penetrating through,
  The core hole forming method for supporting a handrail post according to claim 2.

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