JP2006125176A - Method of forming hole of concrete structure and device for forming hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of forming a hole of a concrete structure and a device for forming the hole which do not require unnecessary time and manpower for attaching and detaching the device for forming the hole, which can reduce the construction time and cut back on the number of workers, which enable the device for forming the hole to be reused, and which can cut costs. <P>SOLUTION: The basic means of the method of forming the hole of the concrete structure and the hole-forming device is that the hole-forming device 10 is magnet-fixed to mold forms 20, 21 for the pouring of concrete which are located in a position where the holes of the concrete structure are to be formed. A sleeve-attaching device 2 having a permanent magnet 3 is engaged with one side or both sides of the openings on both ends of the cylindrical sleeve 1 of the hole-forming device 10. Then the holes used for piping, wiring or other uses are formed in the concrete structure by removing the mold forms 20, 21 and the hole-forming device 10 one by one after the solidification of the fresh concrete poured into the mold forms. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hole forming method and a hole forming tool in a concrete structure for forming holes for wiring and piping in structures such as foundations, beams and floors of various buildings constructed using a formwork. It is.

  Conventionally, holes have been formed through walls and beams in order to perform wiring and piping for gas, electricity, water, air conditioning, sprinklers, medical care, etc. in reinforced concrete buildings. Since it is difficult to form later, a hole forming tool is attached in advance to a place where a hole is to be formed before placing concrete after the formwork is assembled and the reinforcing bars are arranged. Next, means for forming holes used for other purposes such as piping and wiring in walls and beams is used by pouring ready-mixed concrete into the mold and removing the hole forming tool after solidifying.

  With respect to the above, Patent Document 1 discloses a support hole in which a support plate is fixed to the rebar by sandwiching the pair of support plates with a clip in a state where the rebar is sandwiched between the pair of support plates, and each of the support plates is drilled. A sleeve holding structure for a basic reinforcing bar is described in which a sleeve is held by a support plate through the sleeve. Further, Patent Document 2 is a band formed by winding a belt-like body in a circular shape, and is configured to be fastened to the outer peripheral surface of the void sleeve by changing the overlapping portion of both end faces. A sleeve fixing band having four or more binding wires attached thereto is disclosed.

Further, in Patent Document 3, before assembling the reinforcing bars, a pair of bases are respectively attached to the positions where the beam frames are formed in the piping holes of the pair of curtain plates that serve as wall frames, the reinforcing bars are assembled, and an elastic thin plate is provided. A pipe that is rolled up and secured in a tubular shape is inserted into a pipe hole forming portion in which the reinforcing bars are assembled, the pipe is unbound at the hole forming portion for piping, and the pair of bases and spacers are formed on the inner surface thereof. A means for removing the pipe, the pair of bases, and the spacer after the ready-mixed concrete is poured, and then the ready-mixed concrete is poured into the periphery of the pipe.
Japanese Utility Model Publication No. 64-53361 Japanese Utility Model Publication No. 5-84742 Japanese Patent No. 3335336

  However, the technical means according to Patent Documents 1 and 2 are both methods in which foreign matter such as binding wires and bands remain in the finished concrete structure, and it is considered that there is a problem in workability, which is costly. It leads to an increase.

  In addition, the method of closing the holes on both sides of the paper tube cut to an appropriate length with gummed tape and tying it directly to the reinforcing bar with a binding wire or wire is specified in Article 79 of the Building Standards Law and the concrete strength reduction. There is a problem that the covering of the reinforcing bars is insufficient, and the cracking phenomenon of the concrete structure caused by the corrosion due to the exposure of the reinforcing bars tends to occur. In addition, it takes a lot of labor and time to attach and detach the paper tube, and there is a problem that the material cost and other aspects are increased because the hole forming tool cannot be reused.

  According to the method for forming a piping hole described in Patent Document 3, even if the gap between the reinforcing bars is small, a pipe is inserted from the gap, and the pipe hole is disposed at the pipe hole forming portion so that the piping hole has a desired cross section. While maintaining the shape, it can be formed at an accurate position, and a pipe hole with a desired inner diameter can be formed with one pipe, but a thin steel plate is rolled into a cylindrical shape and tied up with a reinforcing bar This is a problem in terms of operability because it is necessary to insert it into the pipe hole formation part in the state, unfasten the pipe, and then re-tighten it after accommodating a pair of base and spacer on the inner surface. Remains.

  Therefore, the present invention eliminates the problems of the conventional hole forming method, and clears the problem of covering the reinforcing bars without leaving foreign matter such as binding wires or bands inside the concrete structure. At the same time, there is no cracking phenomenon in the concrete due to corrosion due to exposure of the reinforcing bars, and it is possible to shorten the construction period and reduce the number of workers without requiring extra labor and time to install and remove the hole forming tool. An object of the present invention is to provide a hole forming method and a hole forming tool in a concrete structure that can further reduce the cost in terms of material cost, labor cost, etc. To do.

  In order to achieve the above-mentioned object, the present invention secures a sleeve to a concrete casting form at a location where a hole of a concrete structure is to be formed, and after the ready-mixed concrete poured into the form is solidified, the form and the sleeve In the hole forming method in a concrete structure that forms holes used for piping, wiring and other uses in the concrete structure by removing the material sequentially, the sleeve is located at the place where the hole of the concrete structure should be formed by magnetic force. A hole forming method in a concrete structure fixed to a casting formwork is provided as a basis. Specifically, a hole forming tool in which a sleeve mounting tool having a permanent magnet is fitted and fixed to one or both ends of a cylindrical sleeve is inserted into a concrete punch at a position where a hole of a concrete structure is to be formed. A sleeve that is magnetically fixed to the installation formwork or cylindrically shaped, and a bottomed cylindrical shape that is fitted and fixed to the opening of the sleeve, and is magnetically attached to the concrete placement formwork at the bottom. A hole-forming tool consisting of a sleeve fixture with a permanent magnet fixed is magnetically fixed to a concrete casting form at a place where a hole in a concrete structure is to be formed, and the ready-mixed concrete poured into the form is solidified. There is provided a method of forming holes used for piping, wiring and other uses in a concrete structure by sequentially removing a mold and a hole forming tool later.

  Further, as a hole forming tool, a bottomed cylindrical sleeve fitting is fitted and fixed to one or both ends of a cylindrically shaped sleeve, and a concrete placement mold is attached to the end face of the sleeve fitting. A structure in which a permanent magnet to be magnetized is fixed, a back yoke is attached to the back side of the permanent magnet, and a ring-shaped yoke with a flange is arranged on the side surface to increase the fixing force of the permanent magnet, and the back yoke and ring Provided is a configuration in which a sleeve fixture is sandwiched between flanges of a yoke and the sleeve fixture and a magnet are fixed. Furthermore, a configuration in which a paper tube formed into a cylindrical shape is used as a sleeve, and a bottomed cylindrical sleeve fitting is fitted and fixed to both ends of a sleeve formed from a flexible thin plate-like member into a cylindrical shape, Provided is a configuration in which a permanent magnet that is magnetically attached to a concrete casting form is fixed to an end face of the sleeve fixture.

  According to the hole forming method and the hole forming tool in the concrete structure obtained by the present invention, the reinforcing bars are arranged so as to intersect vertically and horizontally, and before placing concrete, holes for wiring or piping are provided. A permanent magnet is used to fix the hole forming tool to the formwork where it is desired to form, and concrete is poured into the formwork, and after the concrete is solidified, the formwork and the hole forming tool are sequentially removed to form a concrete structure. Holes used for piping, wiring and other uses can be formed. In particular, by using a permanent magnet, the hole forming tool can be easily and accurately arranged. If the mounting position of the hole forming tool is determined, it is only necessary to measure the distance from the reinforcing bar and magnetize the permanent magnet. The mounting work itself can be performed in about one second and the removal is performed with little effort. Since it can be done in 2 minutes, the working time and cost are greatly reduced. Further, the removed hole forming tool can be reused.

  Since the sleeve mounting tool of the hole forming tool is in close contact with the mold by the magnetic force during the operation, it can be accurately attached to the position to be attached and the hole forming tool can be easily removed. When removing, the sleeve fixture may come off with the mold while being magnetically attached to the mold, and since the sleeve fixture is in close contact with the mold, it is not covered with concrete, and the time required for attaching and removing the hole former is reduced. It can be shortened. Furthermore, the problem of covering the reinforcing bars defined in Article 79 of the Building Standards Law can be solved without difficulty. In addition, the concrete structure is not cracked due to insufficient cover or corrosion due to exposure of reinforcing bars, and a highly durable concrete structure can be obtained.

  Therefore, according to the present invention, no foreign matter remains in the concrete structure, and the cracking phenomenon of the concrete caused by the corrosion due to the covering of the reinforcing bar and the exposure of the reinforcing bar is prevented. Provides a hole forming method and a hole forming tool in a concrete structure that can reduce the cost of materials, labor costs, and other aspects, and can be accurately constructed. can do.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a hole forming method and a hole forming tool in a concrete structure according to the present invention are described below with reference to the drawings. The present invention relates to a hole forming tool in which a sleeve mounting tool having a permanent magnet is fitted and fixed to both end openings of a sleeve formed into a cylindrical shape, and a formwork for concrete placement in a place where a hole of a concrete structure is to be formed. In order to form holes used for piping, wiring and other purposes by removing the formwork and hole forming tool in order after solidification of the ready-mixed concrete poured into the formwork and solidifying it. It has the feature in the hole formation method and hole formation tool in a concrete structure.

  1 is an exploded perspective view showing an example of the hole forming tool 10 in the concrete structure of the present embodiment, FIG. 2 is an enlarged view taken along the arrow A in FIG. 1, and FIG. 3 is a transverse sectional view of the sleeve mounting tool. Reference numeral 1 denotes a sleeve obtained by forming a thin plate member having flexibility into a cylindrical shape having a predetermined diameter. The material of the sleeve 1 is P.I. B. T.A. Synthetic resins such as polyamide and ABS resin are suitable, but other paper and other materials may be used. The diameter of the sleeve 1 can be appropriately set according to the purpose of use. The diameter of the sleeve 1 can be set by curling the plate-shaped body made of the above material into a cylindrical shape and changing the fitting of the sleeve to be fitted. Can be adjusted. Also, a paper tube such as a void formed in advance in a cylindrical shape can be used. When using a paper tube, it is preferable to prepare a plurality of paper tubes having a plurality of diameters corresponding to the diameters of the holes to be formed in advance.

  Reference numerals 2 and 2 denote permanent magnets 3 and 3 fixed to the end surfaces of the bottomed cylindrical sleeve fixtures 2 and 2 which are fitted and fixed to openings at both ends of the sleeve 1. Reference numerals 5 and 5 denote back yokes arranged on the back side of the permanent magnets 3 and 3, and reference numerals 6 and 6 denote ring-shaped yokes with flanges arranged on the side surfaces of the permanent magnets 3 and 3, respectively. The back yoke of 5 and 5 and the ring-shaped yoke with 6 and 6 flanges are integrated to form the same structure as the saddle yoke, and the magnetic force of the permanent magnets 3 and 3 is increased and the sleeve fixtures 2 and 2 are permanently attached. It has the function of fixing the magnets 3 and 3 and the function of protecting the permanent magnets 3 and 3. Further, the sleeve mounting tool 2 and the ring-shaped yoke 6 with a collar are made to be detachable, aiming for 100% recycling. In the illustrated example, the two permanent magnets 3 and 3 are used. However, in the case where the sleeve fixtures 2 and 2 have a large diameter, three or more permanent magnets 3 may be fixed, and a small one may be one piece. A permanent magnet can be used. Reference numeral 4 denotes an operation hole for inserting a dedicated tool (to be described later) when the sleeve fittings 2 and 2 are removed.

  In the illustrated example, the sleeve fixture 2 is fitted and fixed to both opening portions of the sleeve 1, but the sleeve fixture 2 may be fitted and fixed only to one opening portion of the sleeve 1. In addition to the structure constructed by the left and right integrated formwork, there is a case where only one formwork is required, such as a concrete floor of a building. In such a case, the opening on the formwork side of the sleeve 1 is required. The sleeve fixture 2 may be fitted and fixed only to the portion. Furthermore, even when an integral formwork is used, it is possible to support the sleeve with only one magnetic force by selecting the magnetic force. In this case, the sleeve fixture 2 is fitted and fixed to one opening. It is also possible to use it.

  The sleeve 1 is a P.D. B. T.A. A synthetic resin sheet such as polyamide or ABS resin is used to correspond to a size of φ75 mm to 135 mm. For example, when the sleeve 1 having a length of 166 mm and the sleeve fittings 2 and 2 having a thickness of 2 mm are combined, the sleeve 1 having a length of 170 mm is obtained.

  The sleeve fittings 2 and 2 are made of P.S. B. T.A. Synthetic resins such as polyamide and ABS resin can be used. The permanent magnets 3 and 3 can be used semipermanently by using neodymium magnets without demagnetization. As long as the magnetic force does not shift the position of the hole forming tool 10 due to the pressure at the time of placing the ready-mixed concrete, one having an appropriate range may be selected according to the situation. In this embodiment, the desired purpose can be achieved by setting the magnetic force of the permanent magnet 3 to about 3000 Gauss with the back yoke 5 attached.

  FIG. 5 is a schematic view showing a construction state of the method of using the hole forming tool of the present embodiment, and FIG. 6 is a side sectional view showing the assembled state. Reference numeral 11 in the figure denotes a base on which concrete is laid or crushed stones are laid. First, a reinforcing bar is erected on the base 11 to fix the base formwork 12. 13 is a base auxiliary muscle arranged in the base mold 12, 14 is a base main reinforcement, 15 is a lower end muscle, 16 is an abdominal muscle arranged in the concrete structure, 17 is a gluteal muscle, and 18 is an upper end muscle. .

  Next, after the abdominal muscles 16, the gluteal muscles 17, the top muscles 18 and the like arranged in the concrete structure are arranged so as to intersect vertically and horizontally, a formwork 20 at a place where a hole for wiring or piping is to be formed is formed. The hole forming tool 10 is installed by magnetically fixing the sleeve 1 having the sleeve fittings 2 and 2 fitted and fixed to the openings at both ends by the magnetic force of the permanent magnet 3 of the sleeve fitting 2. Thereafter, the remaining mold 21 is fixed as shown in FIG. Next, the ready-mixed concrete is poured into both molds 20 and 21. By using the permanent magnets 3 and 3, it is possible to easily place the hole forming tool 10 at a desired position. Once the mounting position of the hole forming tool 10 is determined, the distance from the reinforcing bar is measured and the permanent magnet 3 is measured. The attachment work itself can be performed in about 1 second.

  Then, after the concrete is solidified, the molds 20 and 21 are removed, and then the hole forming tool 10 is removed, so that holes used for other purposes such as piping and wiring are formed in a structure such as a concrete wall. FIG. 7 shows an example of a dedicated tool 22 used when removing the hole forming tool 10, and the operator holds the handle 23 and inserts the bent portion 24 at the tip into the operation hole 4 of the sleeve mounting tool 2. Then, the sleeve fixture 2 is pulled out or the sleeve fixture 2 on the opposite side is pushed out. Next, the sleeve 1 can be easily taken out from the concrete structure by reducing the diameter so as to be wound inside. The removed hole forming tool 10 such as the sleeve 1, the sleeve mounting tool 2, the permanent magnet 3, the back yoke 5, and the ring-shaped yoke 6 with flanges can be reused.

  The molds 20 and 21 to be used are preferably made of iron or the like so that the hole forming tool 10 can be magnetized, but may be wooden molds. However, when using a wooden formwork, for example, a receiving member such as an iron plate is fixed to the wooden formwork so that the hole forming tool 10 can be magnetically attached. In addition, when attaching an iron plate to the surface of a wooden formwork, it is preferable that it is smaller than the diameter of the sleeve 1 so as not to leave a mark on the surface of the concrete structure when the formwork is removed, and is fixed to the wooden formwork. For this purpose, a suitable iron plate is spiked and a thickness of about 1.0 mm to 1.5 mm is appropriate.

  As described above in detail, the present invention magnetically fixes a hole forming tool using a permanent magnet to a mold where a hole is to be formed before placing ready-mixed concrete, and puts the ready-mixed concrete in the mold. Pour and wiring holes can be formed in concrete structures by removing the formwork and hole forming tool in order after casting and solidifying the concrete, so it can be applied to concrete structures regardless of civil engineering construction. It can be applied to general construction that requires drilling. In particular, long cases such as beams or cases with large diameters can be dealt with by increasing the number of magnets or using a material with high strength, and in cases where the dimensions are short or near the surface layer where no large force is applied, the magnet is only on one side. But sometimes it is enough. Furthermore, when the present invention is applied to the floor of a building, since the formwork is only on one side, it suffices to fit the sleeve fitting only on one side.

  Specifically, by fixing to the formwork using a magnet, it is not necessary to adhere to the reinforcing bar with binding wires, etc., positioning is easy and accurate, and the concrete cover is placed on the reinforcing bar. You can take enough. In addition, the reinforcing bar is not exposed from the hole after the hole is formed, and there is no residue such as a binding wire in the concrete.

The disassembled perspective view which shows an example of the hole formation tool concerning this invention. The A arrow enlarged view of FIG. The cross-sectional view of a sleeve fixture. The B section of FIG. 3, an exploded enlarged view. Schematic which shows the construction state using a hole formation tool. FIG. 6 is a side sectional view showing the assembled state of FIG. 5. The top view which shows an example of an exclusive tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sleeve 2 ... Sleeve attachment tool 3 ... Permanent magnet 4 ... Operation hole 5 ... Back yoke 6 ... Ring-shaped yoke with a flange 10 ... Hole formation tool 11 ... Base 12 ... Base formwork 13 ... Base auxiliary muscle 14 ... Base main muscle 15 ... Lower end muscle 16 ... Abdominal muscle 17 ... Gutter muscle 18 ... Upper end muscle 20, 21 ... Formwork 22 ... Dedicated tool

Claims (7)

  A concrete structure is obtained by fixing a sleeve to a concrete casting mold at a position where a hole in a concrete structure is to be formed, and removing the mold and sleeve sequentially after the ready-mixed concrete poured into the mold is solidified. In a method for forming a hole in a concrete structure for forming a hole used for piping, wiring or other applications, the sleeve is fixed to a concrete casting form in a place where the hole of the concrete structure is to be formed by magnetic force. A method for forming a hole in a concrete structure.   A hole forming tool in which a sleeve mounting tool having a permanent magnet is fitted and fixed to one or both of the opening portions of the cylindrical sleeve is used as a concrete placement mold at a position where a hole of a concrete structure is to be formed. It is characterized by forming holes used for piping, wiring and other uses by removing the formwork and hole forming tool after solidification of the ready-mixed concrete that has been magnetically fixed and poured into the formwork. Forming a hole in a concrete structure.   A sleeve formed into a cylindrical shape, and a bottomed cylindrical shape that is fitted and fixed to the opening of the sleeve, and a sleeve fixture that has a permanent magnet fixedly attached to a concrete casting mold on the bottom. The hole forming tool is magnetically fixed to the concrete casting form at the place where the hole of the concrete structure is to be formed, and after the ready-mixed concrete poured into the form is solidified, the form and the hole forming tool are sequentially removed. The hole formation method in a concrete structure characterized by forming the hole used for piping, wiring, and other uses in the concrete structure.   A cylindrical sleeve fitting with a bottom is fitted and fixed to one or both ends of the cylindrically formed sleeve, and a permanent magnet that is magnetically attached to the concrete placement mold is fixed to the end face of the sleeve fitting. The hole formation tool in the concrete structure characterized by having performed.   A permanent magnet is used as a magnet for attaching the sleeve to the concrete casting formwork, a back yoke is attached to the back surface, a ring-shaped yoke with a flange is arranged on the side surface, and the back yoke and the ring-shaped yoke are arranged. The hole forming tool in a concrete structure according to claim 4, wherein the sleeve mounting tool is sandwiched between the collars, and the sleeve mounting tool and the magnet are fixed.   The hole forming tool in a concrete structure according to claim 4 or 5, wherein a paper tube formed into a cylindrical shape is used as a sleeve.   A bottomed cylindrical sleeve fitting is fitted and fixed to the opening on both ends of a sleeve formed of a flexible thin plate-like member in a cylindrical shape, and is magnetically attached to the concrete placement form on the end surface of the sleeve fitting. A hole forming tool in a concrete structure, wherein a permanent magnet is fixed.