JP2006307447A - Method and tool for forming hole in concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a tool for forming holes in a concrete structure. <P>SOLUTION: In this method of forming the holes in the concrete structure, a sleeve 6 is fixed to a mold 8 for depositing a green concrete at a position where the holes of the concrete structure is to be formed and, after the green concrete poured into the mold 8 is solidified, the mold 8 and the sleeve 6 are removed in order to form the holes used for piping, wiring, and the others in the concrete structure. A hole forming tool comprises a disk-like bottom face 1b, a peripheral wall 1a with a prescribed height vertically formed near the circular end part of the bottom face 1b, an edge part 1d formed on the outside of the peripheral wall 1a, an opening part 1c formed in the bottom face, and a permanent magnet 2 with a back yoke fitted to the opening part 1c. By the magnetic force of the permanent magnet of the hole forming tool, the sleeve 6 is fixed to the form 8 for depositing the green concrete at the position where the holes of the concrete structure are to be formed. The hole forming tool used as a basic means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD 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 various pipes for gas, electricity, water, air conditioning, sprinklers, medical care, etc. in reinforced concrete buildings. Then, it is difficult to form. Therefore, after placing the formwork and arranging the reinforcing bars, before placing the concrete, attach a hole former in advance to the place where you want to form a hole, then pour the ready-mixed concrete into the formwork and solidify it By removing the hole forming tool, a hole for various pipes is formed in a wall, a beam or the like, and means for inserting various pipes into the holes is used.

  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 locations where the piping holes of the pair of curtain plates serving as a beam frame and a wall frame are formed, and the reinforcing bars are assembled to form a thin plate having elasticity. A pipe, which is rolled and secured in a cylindrical shape, is inserted into a pipe hole forming portion where 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. And a means for removing the pipe, the pair of bases, and the spacer after the ready-mixed concrete is poured.

  Further, in Patent Document 4, a sleeve for precast concrete member is provided by using magnetic force for the purpose of obtaining a concrete precast sleeve fixing tool that firmly supports a sleeve for providing a through hole in the mold. A concrete precast sleeve fixture is disclosed which is adapted to be securely fixed to the sleeve. Specifically, it comprises a sleeve support member that supports the cylindrical sleeve from the inner side of the end thereof, and a fixing member that is fitted to the sleeve support member and is fixed to an iron or steel formwork by magnetic force. The fixing member has a small-diameter portion on the distal end side, a large-diameter portion on the proximal end side, and a different diameter cylindrical body having a stepped portion, or a truncated cone shape in which the outer diameter gradually increases from the distal end side toward the proximal end side. The sleeve support member has a disk-shaped main body made of a non-magnetic material or a weak magnetic material, and the outer periphery of the main body is a mold at the time of installation. It has an outer diameter that substantially matches the inner diameter of the sleeve at or near the end face that contacts the frame, and an outer diameter that gradually decreases toward the end face on the opposite side of the end face that contacts the mold. Mating at least The opening has an inner diameter through which the front end of the fixing member passes so that the front end of the fixing member can penetrate and be attracted to the mold, and is engaged with a stepped portion or a truncated cone portion of the fixing member. A concrete precast sleeve fixture having a shoulder or a different inner diameter is described.

According to Patent Document 5, the applicant of the present application previously applied a pipe member used for piping, wiring, or other applications in a concrete structure by the magnetic force of a permanent magnet that fixed a sleeve hole forming tool to a sleeve mounting tool. Fix the piping member in the concrete structure to the concrete casting form at the place where it should be laid, and remove the hole forming tool after removing the form after solidifying the concrete, and then pipe it to the structure such as a concrete wall. A method was proposed in which a hole for a pipe was formed and then a piping member was inserted into the hole. According to this method, since the sleeve mounting tool of the hole forming tool is in close contact with the formwork by magnetic force, the hole forming tool can be accurately attached to the position to be attached and the hole forming tool can be easily removed. Since the fixture is in close contact with the formwork, it is not covered with concrete, the time for attaching and removing the hole forming tool can be shortened, and the construction period can be shortened.
Japanese Utility Model Publication No. 64-53361 Japanese Utility Model Publication No. 5-84742 Japanese Patent No. 3335336 Japanese Patent No. 3338399 Japanese Patent Application No. 2004-124653

  In general, the conventional method of laying piping in a concrete structure is usually done by means of directly fixing a cylindrical form such as a paper tube to the reinforcing bar in the form, but the case where the cylindrical form moves up and down and left and right This causes a problem that it is difficult to lay the piping member accurately. The technical means according to Patent Documents 1 and 2 are methods in which foreign matter such as binding wires and bands remain in the finished concrete structure. During work, holes on both sides of the paper tube cut to an appropriate length are formed. The method of covering with a rubber tape and directly tying it to a reinforcing bar with a tie wire or wire results in a decrease in the strength of the concrete itself and a lack of cover on the reinforcing bar as stipulated in Article 79 of the Building Standards Act. There is a problem that a cracking phenomenon of a concrete structure is likely 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 arranged at a pipe hole forming portion so that the pipe 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 retighten it after accommodating a pair of base and spacer on the inner surface. Remains.

  According to the concrete precast sleeve fixture described in Patent Document 4, a gas cutting device is used to make a hole in the mold to fix the mold anchor for fixing the sleeve to the mold, or a molten metal The sleeve support member can be positioned without damaging the formwork by removing the bolts and fixing the formwork anchors with bolts and nuts. At the time of removal of the tool, it is possible to release the magnetic force adsorption only by rotating the end of the handle of the fixing member, but the number of parts required to form one hole is large, and at the work site Since the mounting position of the sleeve is different each time, the sleeve support member is mounted on the left and right formwork, so accurate positioning is necessary, and the work becomes cumbersome. A.

  Furthermore, the outer diameter of the sleeve support member is equal to the inner diameter of the sleeve, and has an outer diameter that substantially coincides with the inner diameter of the sleeve at or near the end surface that is in contact with the mold frame, and toward the end surface opposite to the end surface that is in contact with the mold frame. Since the outer diameter gradually decreases, the sleeve support member may enter or fall out of the sleeve, and the formwork used in the field is a lightweight steel plate. As a result, the formwork may spread from side to side, and it will not be possible to prevent the intrusion of ready-mixed concrete. In addition, there is a problem that the operation of assembling the sleeve support member in advance cannot be performed.

  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 will be no cracking of concrete due to corrosion due to exposure of the reinforcing bars, and permanent magnets can be attached to the hole forming tool at all times, and it can be assembled in advance, and extra work is required to install and remove the hole forming tool. The construction period can be shortened and the number of workers can be reduced, and the hole forming tool can be reused, leading to cost reductions in material costs, labor costs and other aspects. An object of the present invention is to provide a hole forming method and a hole forming tool in a concrete structure that can be used.

  In order to achieve the above-mentioned object, the present invention provides a method for forming a hole in a concrete structure by fixing a sleeve to a formwork for placing concrete in a place where a hole in the concrete structure is to be formed. In the hole forming method in a concrete structure in which holes used for piping, wiring and other uses are formed in the concrete structure by sequentially removing the formwork and the sleeve after solidification of the poured ready-mixed concrete, a disk-shaped bottom surface; A peripheral wall of a predetermined height that stands vertically near the circumferential edge of the bottom surface, an edge formed on the outside of the peripheral wall, an opening formed in the bottom surface, and an attachment to the opening The sleeve is used for placing raw concrete in a place where a hole of a concrete structure is to be formed by the magnetic force of the permanent magnet of a hole forming tool comprising a permanent magnet with a back yoke. A method of fixing the mold basis.

  Specifically, at one or both ends of the cylindrical sleeve, a disc-shaped bottom surface, a peripheral wall of a predetermined height vertically standing near the circumferential end of the bottom surface, A hole forming tool composed of an edge formed on the outside, an opening formed in the bottom surface, and a permanent magnet with a back yoke attached to the opening is fitted and fixed. After solidifying the ready-mixed concrete that has been magnetically fixed to the ready-casting formwork at the location where holes in the structure are to be formed and then poured into the formwork, the formwork, the hole forming tool and the sleeve are sequentially removed. As a result, holes used for piping, wiring and other purposes are formed in the concrete structure. In addition, a ring with a cross-sectional saddle shape comprising a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall in a plurality of openings formed in the bottom surface of the hole forming tool The peripheral wall of the ring-shaped yoke is fitted and fixed, and the permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke, and the flange portion of the ring-shaped yoke is formed as a hole Provided is a configuration that protrudes from the bottom surface of the tool by the thickness.

  Further, a ring-shaped yoke having a cross-sectional saddle shape comprising a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall in the opening formed in the center of the bottom surface of the hole forming tool The permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke, and the flange portion of the ring-shaped yoke is fixed to the hole-forming tool. The hole is formed so as to protrude from the bottom by the thickness, and an operation hole penetrating the center of the disk-shaped back yoke and the permanent magnet is formed in the center of the hole forming tool. In addition, a plurality of openings formed in the vicinity of the peripheral edge of the bottom surface of the hole forming tool have a cross-sectional surface including a hollow ring-shaped peripheral wall and a flange formed outwardly orthogonal to the end of the peripheral wall. The peripheral wall of the ring-shaped yoke of the mold is fitted and fixed, and the permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke. Is protruded from the bottom surface of the hole forming tool by the thickness, and an operation hole is formed in the center of the bottom surface of the hole forming tool.

  Next, as a hole forming tool in a concrete structure, a disk-shaped bottom surface, a peripheral wall of a predetermined height standing vertically near the circumferential end of the bottom surface, and an edge formed on the outside of the peripheral wall A hole-forming tool comprising: for the preparation of ready-mixed concrete in a place where a hole in a concrete structure is to be formed by the magnetic force of a permanent magnet with a back yoke attached to the opening formed in the bottom surface. A hole forming tool for fixing a sleeve to a mold is provided as a basis. Further, the peripheral wall of a ring-shaped yoke having a cross-sectional shape having a hollow ring-shaped peripheral wall and a flange formed outwardly orthogonal to the end of the peripheral wall in a plurality of openings formed in the bottom surface And fixing the permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening in the circumferential wall of the ring-shaped yoke, and fixing the flange portion of the ring-shaped yoke from the bottom surface of the hole forming tool. It is configured to protrude by the thickness.

  Further, the permanent magnet is fitted and fixed in a disc-shaped yoke formed by a disc-shaped back yoke arranged on the back surface of the permanent magnet and a ring-shaped yoke arranged from the outer surface direction of the hole forming tool, a permanent magnet, A disk-shaped bottom surface having substantially the same area as the opening of various pipes to be laid, a peripheral wall of a predetermined height standing in the vicinity of the circumferential end of the bottom surface, and projecting to the outside of the peripheral wall A hole-forming tool formed from an edge to be fitted and fixed in an opening formed in the bottom surface of the hole-forming tool, a disk-like shape having an area substantially the same as the area of the openings of various pipes for laying permanent magnets A configuration in which one surface of the permanent magnet is fitted and fixed in a recess formed on the bottom surface of the base plate, with the surface protruding slightly outward from the bottom surface. Fitted in a recess formed in the disc-shaped bottom surface having With fitted and fixed in the mold yoke, pot yoke provides a configuration in which the peripheral wall is fitted in a state where slightly projects outwardly from the bottom surface. In addition, a configuration in which a paper tube formed into a cylindrical shape is used as a sleeve and a configuration in which a synthetic resin such as polyamide, PBT, or ABS resin is used as a material of the sleeve or the hole forming tool are provided.

  According to the hole forming method and the hole forming tool in the concrete structure obtained by the present invention, before placing the concrete, a permanent magnet is used for the formwork where the hole for wiring or piping is to be formed. After the hole forming tool is magnetized, the concrete is poured into the mold, and after the concrete is solidified, the mold and the hole forming tool are removed in order to form holes used for piping, wiring and other purposes in the concrete structure. can do. In particular, the use of permanent magnets allows easy and accurate placement of the hole forming tool, and it is possible to assemble the hole forming tool in advance on the sleeve by always attaching the permanent magnet to the hole forming tool. If the position of the hole forming tool is determined even during the work, it is only necessary to measure the distance from the rebar and magnetize the permanent magnet.The attachment work itself can be performed in a very short time, and the removal work takes little effort. Since it does not spend, working time and work cost can be reduced significantly. Further, the removed hole forming tool can be reused.

  Since it adheres to the mold by the magnetic force of the permanent magnet of the hole forming tool during operation, it can be accurately attached to the position to be attached and the hole forming tool can be easily removed. Further, since the hole forming tool is in close contact with the mold, it is possible to shorten the time for attaching and removing the hole forming tool without being covered with concrete. Furthermore, the problem of fogging on the reinforcing bars defined in Article 79 of the Building Standards Act can be solved without difficulty, and cracking of the concrete structure caused by corrosion due to insufficient covering or exposure of reinforcing bars will not occur, A highly durable concrete structure is obtained.

  The number of parts required to construct the hole forming tool is minimal, and accurate positioning is easy because the sleeve is mounted on the left and right molds even if the sleeve mounting position at the work site is different. The work can be simplified. Furthermore, since the outer diameter of the hole forming tool is almost equal to the inner diameter of the sleeve, and the edge is formed in the hole forming tool, it does not enter the sleeve, and the peripheral wall is erected vertically. It will not fall out. Furthermore, even if a formwork spreads with the load of the ready-mixed concrete laid on site, the hole formed does not deform.

  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, and the attachment and removal of the hole forming tool are also performed. Provides a hole forming method and a hole forming tool for concrete structures that can reduce the cost of materials, labor, and other aspects, and that can be accurately constructed without requiring a great deal of labor and time. 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 fixes a sleeve to a mold for casting concrete in a place where a hole of a concrete structure is to be formed, and removes the mold and the sleeve sequentially after the ready-mixed concrete poured into the mold is solidified. In a hole forming method for forming a hole used for piping, wiring or other uses in a concrete structure, a disk-shaped bottom surface, and a peripheral wall of a predetermined height that stands vertically near the circumferential end of the bottom surface , By the magnetic force of the permanent magnet of the hole forming tool comprising an edge formed on the outer side of the peripheral wall, an opening formed in the bottom surface, and a permanent magnet with a back yoke attached to the opening. The hole forming method and the hole forming tool are basically used in a concrete structure in which the sleeve is fixed to a formwork for placing concrete in a place where the hole of the concrete structure is to be formed.

  FIG. 1 is a perspective view of a hole forming tool 1 in a concrete structure according to a first embodiment of the present invention, FIG. 2 is a plan sectional view of an essential part thereof, and FIG. 3 shows a state in which the hole forming tool 1 is installed in a mold. The hole forming tool 1 is a vertical bottom surface 1b having an area substantially the same as the opening area of various pipes to be laid, and the vicinity of the circumferential end of the bottom surface 1b. The peripheral wall 1a is provided with a predetermined height and an edge 1d formed on the outer side of the peripheral wall 1a. As shown in FIG. 4, the hole forming tool 1 is inserted into a place where a piping member in a concrete structure is to be laid, and the peripheral wall 1a is fitted from the outside of both end openings of the sleeve 6, and the edge 1d is connected to the sleeve 6 It is mounted by engaging with the open end of the.

  Two openings 1c are formed in the bottom surface 1b of the hole forming tool 1, and the opening 1c has a hollow ring-shaped peripheral wall 5a and an outer side perpendicular to the end of the peripheral wall 5a as shown in FIG. A peripheral wall 5a of a ring-shaped yoke 5 having a bowl-shaped cross section composed of a flange part 5b formed in the shape is fitted. The flange portion 5b of the ring-shaped yoke 5 protrudes from the bottom surface 1b of the hole forming tool 1 by the thickness thereof, and is fixed to the disk-shaped back yoke 4 having a diameter larger than the opening portion 1c in the peripheral wall 5a of the ring-shaped yoke 5. A permanent magnet 2 is fitted and attached to the hole forming tool 1. The thickness of the permanent magnet 2 is substantially the same as the bottom surface 1 b of the hole forming tool 1 or slightly thinner than the bottom surface 1 b, and is located slightly inside the collar portion 5 b of the ring-shaped yoke 5. Reference numeral 3 denotes an operation hole formed in the bottom surface 1b of the hole forming tool 1 and is used when a dedicated tool is inserted when the hole forming tool 1 is removed.

  The permanent magnet 2 has a disk-like back yoke 4 arranged on the back surface and a ring-shaped yoke 5 arranged from the outer surface direction so that the magnetic force is increased to the same shape as that of the saddle yoke. 8 can be stably fixed inside. Further, the permanent magnet 2 to which the disc-shaped back yoke 4 is fixed, the ring-shaped yoke 5 and the sleeve 6 are separate members and can be separated from each other, and can be replenished and reused individually.

  The permanent magnet 2 is attached by inserting the peripheral wall 5a of the ring-shaped yoke 5 from the outer surface side of the opening 1c formed in the bottom surface 1b of the hole forming tool 1, and then fixing the disk-shaped back yoke 4 from the inner surface side. Is inserted into the peripheral wall 5a of the ring-shaped yoke 5 and fixed. In the illustrated example, two permanent magnets 2 are used. However, in the case where the diameter of the hole forming tool 1 is large, three or more permanent magnets 2 may be fixed, or the diameter of the hole forming tool 1 may be fixed. In a small case, one permanent magnet 2 may be fixed.

  In contrast to the permanent magnet 2 alone, the permanent magnet 2 with the disk-like back yoke 4 has a large magnetic force. Although the permanent magnet 2 itself is fragile and easily broken, it is easy to handle by fixing the disk-shaped back yoke 4, and the permanent magnet 2 does not directly touch the raw concrete placing form 8 by the ring-shaped yoke 5. In this way, the permanent magnet 2 is protected.

  As the material of the hole forming tool 1, a synthetic resin such as polyamide, PBT, vinyl chloride, or ABS resin can be used. The permanent magnet 2 can be used semipermanently by using a neodymium magnet without demagnetization. As long as the magnetic force does not shift the position of the ready-mixed concrete casting form 8 due to the pressure when placing the ready-mixed concrete, one in an appropriate range may be selected according to the situation. In the present embodiment, the intended purpose can be achieved by setting the magnetic force of the permanent magnet 2 to about 3000 gauss with the disc-shaped back yoke 4 attached.

  The sleeve 6 is formed by forming a thin plate member having flexibility into a cylindrical shape having a predetermined diameter. As the material of the sleeve 6, a synthetic resin such as polyamide, PBT, or ABS resin is suitable, but other materials such as paper may be used. The diameter of the sleeve 6 can be appropriately set according to the purpose of use, and the diameter can be adjusted by changing the hole-forming tool 1 for fitting the plate-like body made of the above-mentioned material into a cylindrical shape. can do. 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. The sleeve 6 is made to correspond to a size of φ75 mm to 135 mm by using a sheet made of synthetic resin such as polyamide and ABS resin having a thickness of about 1 mm. For example, when the sleeve 6 having a length of 166 mm and the hole forming tool 1 having the edge 1d having a thickness of 2 mm are added together, a sleeve having a length of 170 mm is obtained.

  FIG. 5 is a schematic view showing a construction state of hole formation using the hole forming tool 1 of the first 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. .

  Then, after the abdominal muscles 16, the gluteal muscles 17, the upper muscles 18, etc. arranged in the concrete structure are arranged so as to intersect vertically and horizontally, they are formed on the formwork 8 a where a hole for wiring or piping is to be formed. After the sleeve 6 having the hole forming tool 1 fitted and fixed to the openings at both ends is magnetically fixed by the magnetic force of the permanent magnet 2, the mold 8 b is magnetically fixed to the other side of the sleeve 6.

  Next, ready-mixed concrete is poured into both molds 8a, 8b. By using the permanent magnets 2 and 2, the hole forming tool 1 can be easily arranged at a desired position. When the mounting position of the hole forming tool 1 is determined, the distance from the reinforcing bar is measured and the permanent magnet 2 is measured. The attachment work itself can be performed in about 1 second.

  Then, after the concrete is solidified, the molds 8a and 8b are removed, and then the hole forming tool 1 and the sleeve 6 are removed, so that holes used for piping, wiring and other uses 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 1, and the operator holds the handle 23 and inserts the bent portion 24 at the tip into the operation hole 3 of the hole forming tool 1. Then, the hole forming tool 1 is pulled out or the hole forming tool 1 on the opposite side is pushed out. Next, the sleeve 6 can be easily taken out from the concrete structure by reducing the diameter of the thin sleeve 6 so as to be wound inside. The removed hole forming tool 1 can be reused.

  As shown in FIG. 6, in this example, the hole forming tool 1 is fitted and fixed to both opening portions of the sleeve 6, but the hole forming tool 1 is fitted and fixed only to one opening portion of the sleeve 6. You may make it do. In addition to the structure constructed by the left and right integrated molds 8a and 8b, there are cases where only one form is required, such as a concrete floor of a building. In such a case, the form of the sleeve 6 is used. The hole forming tool 1 may be fitted and fixed only in the opening on the side. Furthermore, even when an integral mold is used, it is possible to support the sleeve 6 with only one magnetic force by selecting the magnetic force. In this case, the hole forming tool 1 is fitted and fixed to one opening. It is also possible to use it.

  The molds 8a and 8b to be used are preferably made of iron or the like so that the hole forming tool 1 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 1 can be magnetized. 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 6 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.

  FIG. 8 is a front view showing a hole forming tool 1 according to a second embodiment of the present invention, and FIG. 9 is a plan sectional view of the main part thereof, and is a bottomed cylindrical shape fitted and fixed to both end openings of the sleeve 6. The hole-forming tool 1 has a disc-shaped bottom surface 1b having an area substantially the same as the area of the opening of various pipes to be laid, and a predetermined height vertically erected in the vicinity of the circumferential end of the bottom surface 1b. It is formed of a peripheral wall 1a and an edge 1d that protrudes to the outside of the peripheral wall 1a. Further, two openings 1c and 1c are formed in the bottom surface 1b, and permanent magnets 2 and 2 are fitted and fixed in the openings 1c and 1c. 4 and 4 are disk-shaped back yokes arranged on the back side of the permanent magnets 2 and 2 in order to increase the magnetic force of the permanent magnets 2 and 2, and the disk-shaped back yokes 4 and 4 have holes in the permanent magnets 2 and 2. It also has a function as a reinforcing member for stably fixing to the forming tool 1. Reference numeral 3 denotes an operation hole for inserting the dedicated tool 22 when the hole forming tool 1 is removed. In the second embodiment, the structural feature is that the end surfaces of the permanent magnets 2 and 2 slightly protrude outward from the bottom surface 1 b of the hole forming tool 1.

  According to the second embodiment, when the hole is formed in the concrete structure, the abdominal muscle 16, the gluteal muscle 17, the upper muscle 18, etc. shown in FIG. 5 are provided in the concrete structure as in the first embodiment. The sleeve 6 in which the hole forming tool 1 is fitted and fixed to the opening 8 at both ends of the mold 8a where the hole is to be formed after being arranged so as to intersect vertically and horizontally is magnetically fixed by the magnetic force of the permanent magnet 2, and then the sleeve 6 is fixed. The mold 8b is magnetically attached to the other side of the mold 8 and the concrete 8 is poured into the molds 8a and 8b, and then the molds 8a and 8b are removed after the concrete is solidified. By removing 6, holes used for piping, wiring and other uses can be formed in structures such as concrete walls.

  FIG. 10 is a cross-sectional plan view showing the main part of a hole forming tool 1 according to a third embodiment of the present invention. The hole forming tool 1 has a disk-like shape having substantially the same area as the opening area of various pipes to be laid. A peripheral wall 5a of a saddle type yoke 5c comprising a bottomed ring-shaped peripheral wall 5a and a flange 5b formed outward from the base of the peripheral wall 5a is fitted into the opening 1c formed in the bottom surface 1b. The permanent magnet 2 is fitted and fixed in the peripheral wall 5a. In the third embodiment, the structural feature is that the end surface of the bottomed ring-shaped peripheral wall 5a slightly protrudes outward from the bottom surface 1b of the hole forming tool 1. In this example as well, the form of construction for forming holes in the concrete structure is substantially the same as in the first and second embodiments.

  FIG. 11 is a plan cross-sectional view showing a main part of a hole forming tool 1 according to a fourth embodiment of the present invention. The hole forming tool 1 has a disk-like shape having substantially the same area as the opening area of various pipes to be laid. The permanent magnet 2 is fitted and fixed in a recess 5d formed on the bottom surface 1b. In the fourth embodiment, a structural feature is that the end face of the permanent magnet 2 slightly protrudes outward from the bottom face 1 b of the hole forming tool 1. The construction mode for forming the holes in the concrete structure according to the fourth embodiment is substantially the same as the first and second embodiments.

  FIG. 12 is a plan sectional view showing a principal part of a hole forming tool 1 according to a fifth embodiment of the present invention. The hole forming tool 1 has a disk-like shape having substantially the same area as the opening area of various pipes to be laid. A saddle type yoke 5c having a bottomed ring-shaped peripheral wall 5a is fitted in a recess 5d formed in the bottom surface 1b, and the permanent magnet 2 is fitted and fixed in the saddle type yoke 5c. In this fifth embodiment, the end face of the peripheral wall 5a of the saddle type yoke 5c slightly protrudes outward from the bottom surface 1b of the hole forming tool 1, and the permanent magnet 2 is positioned inside the end face of the peripheral wall 5a. It has become a feature of. In this example as well, the form of construction for forming holes in the concrete structure is substantially the same as in the first and second embodiments.

  FIG. 13 is a fragmentary plan sectional view showing a hole forming tool 1 according to a sixth embodiment of the present invention. FIG. 14 is a fragmentary sectional view showing the hole forming tool 1 installed in a mold. The forming tool 1 includes a disk-shaped bottom surface 1b having an area substantially the same as the area of the opening of various pipes to be laid, and a peripheral wall 1a having a predetermined height that is erected vertically in the vicinity of the circumferential end of the bottom surface 1b. And an edge 1d formed on the outer side of the peripheral wall 1a. One opening 1c is formed in the center of the bottom surface 1b of the hole forming tool 1, and a hollow ring shape is formed in the opening 1c. The peripheral wall 5a of a ring-shaped yoke 5 having a bowl-shaped cross section, which includes a peripheral wall 5a and a flange 5b formed outwardly orthogonal to the end of the peripheral wall 5a, is fitted. The permanent magnet 2 is fitted and fixed in the peripheral wall 5 a of the ring-shaped yoke 5 and is attached to the hole forming tool 1. The thickness of the permanent magnet 2 is substantially the same as the end face of the hole forming tool 1, and a disk-shaped back yoke 4 having a diameter larger than the opening 1 c is fixed to the back side of the permanent magnet 2. Further, an operation hole 3 is formed in the center of the hole forming tool 1 through the center of the disk-shaped back yoke 4 and the permanent magnet 2.

  As shown in FIG. 14, the hole forming tool 1 is inserted into a place where a piping member in a concrete structure is to be laid. The hole forming tool 1 is mounted on the ready-mixed concrete casting form 8 by engaging with the opening end of the raw concrete. During this operation, the permanent magnet 2 has the same shape as that of the saddle yoke by the ring-shaped yoke 5 and the disk-shaped back yoke 4 arranged on the back surface, and the magnetic force is increased. It can be stably fixed inside. Since the flange portion 5b of the ring-shaped yoke 5 protrudes from the bottom surface 1b of the hole forming tool 1 by the thickness, the permanent magnet 2 does not directly contact the ready-mixed concrete casting form 8.

  FIG. 15 is a rear view showing a hole forming tool 1 according to a seventh embodiment of the present invention, and FIG. 16 is a cross-sectional view of a main part showing a state in which the hole forming tool 1 is installed in a mold. Is a disc-shaped bottom surface 1b having an area substantially the same as the area of the opening of various pipes to be laid, and a peripheral wall of a predetermined height that is vertically erected at a position spaced apart from the circumferential end of the bottom surface 1b. 1a and a wide edge 1d formed on the outer side of the peripheral wall 1a, and a plurality of openings 1c, 1c are formed in the vicinity of the peripheral edge of the bottom surface 1b. The peripheral wall 5a of the ring-shaped yoke 5 having a bowl-shaped cross section including a hollow ring-shaped peripheral wall 5a and a flange portion 5b formed outwardly orthogonal to the end portion of the peripheral wall 5a is fitted to 1c. The permanent magnet 2 is fitted and fixed in the peripheral wall 5 a of the ring-shaped yoke 5 and is attached to the hole forming tool 1. The thickness of the permanent magnet 2 is substantially the same as the end face of the hole forming tool 1, and the back side of the permanent magnet 2 is fixed to the disc-shaped back yoke 4. Further, an operation hole 3 is formed in the center of the hole forming tool 1 through the center of the disc-shaped bottom surface 1b. The seventh embodiment is particularly effective when only one of the hole forming tools 1 is magnetized or when a hole having a small diameter is formed.

  As shown in FIG. 16, the hole forming tool 1 is fitted into the peripheral wall 1 a from the outside of both end openings of the sleeve 6 where the piping member in the concrete structure is to be laid, and the edge 1 d is connected to the sleeve 6. The hole forming tool 1 is mounted on the ready-mixed concrete casting form 8 by engaging with the opening end of the raw concrete. During this operation, a plurality of permanent magnets 2 arranged in the vicinity of the peripheral edge of the bottom surface 1b have the same shape as the saddle yoke by the ring-shaped yoke 5 and the disk-shaped back yoke 4 disposed on the back surface, and the magnetic force is increased. Similarly to the fifth embodiment, the permanent magnet 2 can be stably fixed inside the ready-mixed concrete casting form 8. Since the flange portion 5b of the ring-shaped yoke 5 protrudes from the bottom surface 1b of the hole forming tool 1 by the thickness, the permanent magnet 2 does not directly contact the ready-mixed concrete casting form 8.

  As explained in detail above, according to the hole forming method and the hole forming tool in the concrete structure obtained by the present invention, before placing the concrete, the hole forming tool is magnetized by using a permanent magnet in the mold. After being put on, ready-mixed concrete is poured into the formwork, and after the concrete is solidified, the formwork and the hole forming tool are sequentially removed to form holes used for piping, wiring and other purposes in the concrete structure. By using a permanent magnet, the arrangement of the hole forming tool can be performed easily and accurately, and it is possible to assemble the hole forming tool in advance in the sleeve by always attaching the permanent magnet to the hole forming tool. The installation work of the hole forming tool itself can be done in a very short time, and the removal work takes almost no labor, and the work time and work cost can be greatly reduced. It can be applied to general construction that requires drilling holes. Especially in the case of a large diameter, it can be dealt with by increasing the number of magnets or using a material with high strength. In the case of a short dimension or a portion near the surface layer where no large force is applied, the magnet may be sufficient on only one side. . When the present invention is applied to the floor of a building, the formwork has only one side, so it is only necessary to fit the hole forming tool on one side. In particular, by using permanent magnets and fixing to the formwork, it is not necessary to fix to the reinforcing bars with binding wires, etc., and positioning is easy and it is possible to cover the reinforcing bars with sufficient and sufficient coverage. There is no bar arrangement exposed from the hole after the hole is formed, and there is no residue such as a binding wire in the concrete.

The perspective view of the hole formation tool of 1st Example of this invention. The principal part plane sectional view of FIG. The principal part sectional drawing which shows the state which installed the hole formation tool in the formwork. The perspective view which shows the state which fitted the hole formation tool from the outer side of the opening part of a sleeve. Schematic which shows the hole formation construction state using the hole formation tool of 1st Example. The sectional side view which shows the assembly | attachment state of 1st Example. The top view which shows an example of an exclusive tool. The front view which shows the hole formation tool of 2nd Example of this invention. The principal part plane sectional view of FIG. The principal part plane sectional view which shows the hole formation tool of 3rd Example of this invention. The principal part plane sectional view which shows the hole formation tool of 4th Example of this invention. The principal part plane sectional view which shows the hole formation tool of 5th Example of this invention. The principal part plane sectional view which shows the hole formation tool of 6th Example of this invention. The principal part sectional drawing which shows the state which installed the hole formation tool in the formwork. The rear view which shows the hole formation tool of 7th Example of this invention. The principal part sectional drawing which shows the state which installed the hole formation tool in the formwork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hole formation tool 1a ... Peripheral wall 1b ... Bottom 1c ... Opening part 1d ... Edge part 2 ... Permanent magnet 3 ... Operation hole 4 ... Disk-shaped back yoke 5 ... Ring-shaped yoke 5a ... Peripheral wall 5b ... Gutter part 5c ... Spider type Yoke 5d ... recess 6 ... sleeve 8 ... ready-mixed casting form 11 ... base 12 ... base form 13 ... base auxiliary muscle 14 ... base main muscle 15 ... lower end muscle 16 ... abdominal muscle 17 ... gluteal muscle 18 ... upper end muscle 22 ... Special tool 23 ... handle 24 ... bent part

Claims (13)

A concrete structure is obtained by fixing a sleeve to a formwork for placing ready-mixed concrete at a position where a hole in the concrete structure is to be formed, and sequentially removing the formwork and the sleeve after the ready-mixed concrete poured into the formwork is solidified. In the hole formation method in concrete structures that form holes used for piping, wiring and other uses,
A disc-shaped bottom surface, a peripheral wall of a predetermined height that is vertically erected in the vicinity of a circumferential end of the bottom surface, an edge formed outside the peripheral wall, and an opening formed in the bottom surface The sleeve is formed into a formwork for placing concrete in a place where a hole in the concrete structure is to be formed by the magnetic force of the permanent magnet of the hole forming tool comprising a permanent magnet with a back yoke attached to the opening. A method for forming a hole in a concrete structure characterized by fixing.   Formed on one or both ends of the cylindrical sleeve at both ends thereof, a disk-shaped bottom surface, a peripheral wall of a predetermined height that stands vertically near the circumferential end of the bottom surface, and outside the peripheral wall A hole forming tool comprising an edge, an opening formed in the bottom surface, and a permanent magnet with a back yoke attached to the opening is fitted and fixed, and the hole forming tool is inserted into a hole in a concrete structure. After solidifying the ready-mixed concrete that has been magnetically fixed to the ready-casting formwork at the place to be formed and then poured into the formwork, the formwork, the hole forming tool, and the sleeve are sequentially removed, thereby providing a concrete structure. A method for forming a hole in a concrete structure, characterized in that a hole used for piping, wiring or other purposes is formed in an object.   A ring-shaped yoke having a bowl-shaped cross section comprising a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall in a plurality of openings formed in the bottom surface of the hole forming tool The permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke, and the flange portion of the ring-shaped yoke is fixed to the hole-forming tool. The method for forming holes in a concrete structure according to claim 1 or 2, wherein the hole is formed so as to protrude from the bottom by a thickness.   A ring-shaped yoke having a cross-sectional saddle shape comprising a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall in the opening formed in the center of the bottom surface of the hole forming tool The peripheral wall is fitted and fixed, and the permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke, and the collar portion of the ring-shaped yoke is fixed to the bottom surface of the hole forming tool. In the concrete structure characterized in that the operation hole penetrating the center portion of the disk-shaped back yoke and the permanent magnet is formed in the center portion of the hole forming tool. Hole formation method.   A plurality of openings drilled in the vicinity of the peripheral edge of the bottom surface of the hole forming tool are of a cross-sectional saddle shape comprising a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall The peripheral wall of the ring-shaped yoke is fitted and fixed, and the permanent magnet fixed to the disk-shaped back yoke larger in diameter than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke. A hole forming method in a concrete structure, wherein the hole is formed by projecting from the bottom surface of the forming tool by a thickness, and an operation hole is formed in the center of the bottom surface of the hole forming tool.   A hole-forming tool comprising a disc-shaped bottom surface, a peripheral wall having a predetermined height that stands vertically in the vicinity of a circumferential end of the bottom surface, and an edge formed on the outer side of the peripheral wall. A sleeve is fixed to a formwork for placing concrete in a place where a hole of a concrete structure is to be formed by a magnetic force of a permanent magnet with a back yoke attached to an opening formed in Hole forming tool in concrete structures.   A plurality of openings formed in the bottom surface are fitted with a ring-shaped yoke having a ring-shaped cross section composed of a hollow ring-shaped peripheral wall and a flange formed outwardly perpendicular to the end of the peripheral wall. The permanent magnet fixed to the disk-shaped back yoke having a diameter larger than the opening is fitted and fixed in the peripheral wall of the ring-shaped yoke, and the flange portion of the ring-shaped yoke is separated from the bottom surface of the hole forming tool by the thickness. A hole forming tool in a concrete structure, characterized by being protruded only.   The permanent magnet is fitted and fixed in a collar yoke formed by a disc-shaped back yoke disposed on the back surface of the permanent magnet and a ring-shaped yoke disposed from the outer surface direction of the hole forming tool. Hole forming tool in concrete structures.   A disk-shaped bottom surface having an area substantially the same as the area of the opening of various pipes for laying the permanent magnets, a peripheral wall of a predetermined height standing in the vicinity of the circumferential end of the bottom surface, and the peripheral wall The hole forming tool in a concrete structure according to claim 6 or 7, wherein the hole forming tool is fitted and fixed in an opening formed in the bottom surface of the hole forming tool formed from an edge protruding outward.   The permanent magnet is fitted in a recess formed in a disk-shaped bottom surface having an area substantially the same as the opening area of various pipes to be laid, with one surface of the permanent magnet protruding slightly outward from the bottom surface. The hole forming tool in the concrete structure according to claim 6 or 7, which is fixed.   The permanent magnet is fitted and fixed in a saddle yoke fitted in a recess formed in a disk-shaped bottom surface having an area substantially the same as the area of the opening of various pipes to be laid. The hole forming tool in a concrete structure according to claim 6 or 7, wherein the peripheral wall is fitted as a state protruding slightly outward from the bottom surface.   The hole forming tool in a concrete structure according to claim 6, 7, 8, 9, 10 or 11, wherein a paper tube formed into a cylindrical shape is used as a sleeve.   The hole forming tool in a concrete structure according to claim 6, 7, 8, 9, 10 or 11, wherein a synthetic resin such as polyamide, PBT, or ABS resin is used as a material of the sleeve or the hole forming tool.

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