JP2009035982A - Device and method for forming bent hole in concrete foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for forming a bent hole in a concrete foundation for forming a bent hole bent at a predetermined angle to allow various pipes such as drain pipes to be inserted therein between the outer vertical surfaces of the concrete foundations (outer surfaces of rise parts) and the inner horizontal surfaces thereof (surface of inner mat foundation or surface of floor concrete part) of various buildings constructed by using molds. <P>SOLUTION: This device comprises a pair of sleeves 2, 3 formed by so winding base sheets 9a, 9b in a hollow cylindrical shape as to be expanded and contracted and having elliptic opening parts 3a, 3a formed at one end and sleeve opening retaining devices 4, 5 fitted to opening parts 2b, 3b at the other ends of the sleeves 2, 3. In this method, the elliptic opening parts 2a, 3a of the sleeves 2, 3 are fitted and fixed to each other to continuously connect the pair of sleeves 2, 3 to each other at a predetermined angle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a drainage pipe between the outer vertical surface (outer surface of the upright part) and the inner horizontal surface (the surface of the inner solid foundation part or soil concrete part) in the concrete foundation of various buildings constructed using the formwork. The present invention relates to a bending hole forming tool and a bending hole forming method in a concrete foundation that forms a bending hole that bends at a predetermined angle so as to pass through the various pipes.

  Conventionally, a concrete foundation of a building such as a house has been provided with a through hole for inserting a water supply pipe, a drain pipe, a gas pipe, an electric wiring pipe, a ventilation pipe and other various pipes. The through-holes for ventilation pipes etc. may be straight holes, but the through-holes for drain pipes need to be buried in the ground from the viewpoint of aesthetics of the exterior of the building, damage to piping, effective use of the site, etc. For this reason, the opening in the inner horizontal plane of the concrete foundation needs to be at a higher position in the vertical direction than the opening in the outer vertical plane. That is, the through hole in the concrete foundation through which the drain pipe is inserted needs to be bent at a predetermined angle.

  Conventionally, before placing the foundation concrete, the drainage pipe is installed at a predetermined location in the reinforcing bar for foundation and then the ready-mixed concrete is placed to bury the drainage pipe. Or, it is called the boxing method, by placing concrete with a rectangular parallelepiped box installed in the reinforcement of the foundation where the drain pipe is installed on the inner horizontal surface of the concrete foundation, and removing the box after the concrete is solidified The space where the formed rectangular parallelepiped concrete was not placed was used as a space for installing the drain pipe. After that, drainage pipes were installed so that they could be bent at a predetermined angle using holes that had been drilled in advance on the outer vertical surface of the concrete foundation so that they could be connected to this space, and the space was filled with sand or mortar. It was.

  In addition, recently, before placing concrete for foundation, after placing a sheath pipe at a predetermined location in the foundation reinforcing bar, concrete is placed to bury the sheath pipe, and after solidifying the concrete, A sheath pipe for inserting a drain pipe is provided (Patent Document 1). Also, the drain pipe inserted into the sheath pipe is a flexible pipe, an annular waterproof packing is attached to the opening of one end of the sheath pipe exposed on the outer surface of the basic concrete, and the inner periphery of the waterproof packing is connected to one end of the flexible pipe. With a piping structure in which the outdoor drainage pipe and the indoor drainage pipe are connected to the rigid straight pipe portions at both ends of the flexible pipe via pipe joints, respectively, the water tightness is good. There is also provided a drainage pipe piping structure that is excellent in workability and does not have a risk of impairing watertightness even if the position of the upper end of the flexible pipe of the base penetrating member is set low (Patent Document 2).

In addition, the applicant of the present application first lays a concrete structure by the magnetic force of a permanent magnet in which a hole forming tool made of a sleeve is fixed to a sleeve mounting tool when laying a straight pipe member used for piping, wiring or other purposes on a concrete structure. Fix the piping member in the object to the concrete formwork at the place where it should be laid, remove the formwork after solidifying the concrete, and then remove the hole forming tool to connect the structure to the concrete wall or other structure. A method of forming a hole and then inserting a straight pipe member into the hole is proposed (Patent Document 3). 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.
JP 2002-54203 A JP 2004-44170 A JP 2006-307447 A

  In the conventional method of burying the drainage pipe directly in the foundation concrete, if maintenance work is required due to damage or leakage of the drainage pipe, the reinforcing rod in the foundation concrete or foundation concrete is removed. It must be destroyed, not only is the work complicated, it can seriously affect the strength of the building and cannot be adopted. Moreover, the boxing method only needs to remove the mortar in the boxed part for maintenance, but it requires complicated work of removing the mortar, and the sand or mortar part is not integrated with the foundation concrete, so it is strong. It is inferior to. Furthermore, the box opening method itself takes time to install the box, and the removal requires destruction of the box, which requires troublesome labor, materials, and labor, so it is only used by some house makers. .

  The sheath pipes shown in Patent Documents 1 and 2 can solve the problems of the conventional construction method described above, and satisfy the standards indicated by the “Housing Quality Assurance Promotion Act” constructed in June 2000. . However, the sheath pipe itself is buried in the foundation concrete and cannot be reused, and the flexible pipe as a drain pipe inserted into the sheath pipe has a special structure, and is a normal vinyl chloride. It is significantly more expensive than a drainage pipe made of steel. Further, since a space is formed between the drain pipe and the sheath pipe, when dew condensation occurs in the drain pipe, water drops are stored in the sheath pipe, resulting in a sanitary problem.

  Therefore, the present invention eliminates the problems of the conventional drainage pipe forming method, and in a concrete foundation of various buildings constructed using a formwork with a simple configuration without using a sheath pipe. By forming a bent hole that bends at a predetermined angle for inserting various pipes such as drainage pipes between the outer vertical surface and the inner horizontal surface, the standard indicated by the `` Housing Quality Assurance Promotion Method '' is satisfied, An object of the present invention is to provide a bending hole forming tool and a bending hole forming method in a concrete foundation that can be reused and does not require time and labor for construction.

  In order to achieve the above-mentioned object, the present invention connects two sleeves in which two sleeves formed by winding a base sheet into a hollow cylinder so that the diameter of the base sheet can be increased or decreased are bent at a predetermined angle. The present invention basically provides a bending hole forming tool in a concrete foundation in which sleeve opening shape retainers are attached to both end openings of two sleeves. Specifically, a pair of sleeves in which a base sheet is wound into a hollow cylinder so that the diameter can be increased and reduced, and an elliptical opening is formed at one end, and a sleeve attached to the opening at the other end of the sleeve It consists of an opening shape holder, and is formed by connecting a pair of sleeves so as to bend at a predetermined angle by fixing the oval openings of the sleeves in close contact with each other.

  Then, the sleeves are connected by fixing with a sleeve connector, and at least one of the sleeve opening shape retainers is equipped with a permanent magnet, whereby the ready-mixed concrete is located at a place where a bent hole of a concrete foundation is to be formed by the permanent magnet. A sleeve opening shape retainer can be magnetically attached to the casting mold. The sleeve opening shaper comprises a disk-shaped lid surface, a peripheral wall of a predetermined height that stands vertically near the circumferential end of the lid surface, and an edge formed outside the peripheral wall. In at least one of the sleeve opening shape holders, an opening is formed in the lid surface, and a permanent magnet with a back yoke is attached to the opening. In addition, a sleeve internal shaper that gives the shape of the sleeve is disposed in the sleeve, and the sleeve internal shaper is a hollow annular body whose outer peripheral surface is in close contact with the inner peripheral surface of the sleeve. Removing the shape or sleeve opening shape retainer and the sleeve internal shape retainer reduces the diameter of the sleeve. A synthetic resin such as polyamide, PBT, ABS resin, nylon or polypropylene is used as the material of the sleeve and / or sleeve opening shape retainer.

  In addition, one sleeve opening shape retainer of the bending hole forming tool in the concrete foundation having the above-described structure is fixed to a formwork for placing concrete in the place where the outer vertical surface of the concrete foundation is to be formed, and the inner side. Fix the other sleeve opening shape fixer to the place where the horizontal plane is formed so that it is exposed from the inner horizontal plane, and remove the formwork and the bending hole forming tool one after another after solidifying the ready-mixed concrete to construct the concrete foundation By this, the bending hole formation method in the concrete foundation which forms the bending hole for inserting various pipings, such as a drain pipe, between the outer side vertical surface and inner side horizontal surface in the concrete foundation of a building is provided. Then, after the ready-mixed concrete was solidified, the ready-made concrete casting form at the place where the outer vertical surface was to be formed was removed, and then placed in the sleeve opening shape holder or the sleeve opening shape holder and the sleeve. By removing the sleeve internal shape retainer, the sleeve was reduced in diameter to be removable.

  According to the bent hole forming tool and the bent hole forming method in the concrete foundation according to the present invention, a bent hole for a drain pipe or the like can be easily constructed in the foundation concrete without using a sheath pipe left in the concrete. Can do. That is, the angle of the bent hole to be constructed can be freely set by selecting the shape and angle of the elliptical opening of the sleeve, and the diameter and shape of the sleeve can be set with the sleeve opening shape fitting to be installed in the opening. The shape can be retained by a sleeve internal shaper disposed in the sleeve. Therefore, by connecting the two sleeves, a bent hole forming tool that is easily bent at a predetermined angle can be obtained.

  And, using a permanent magnet attached to one of the sleeve opening shape holders, the outer vertical surface of the concrete foundation is fixed to the formwork for placing concrete in the place where it should be formed, and the inner horizontal surface is formed. By fixing the other sleeve opening shape retainer so as to be exposed from the inner horizontal surface at the place to be done, it can be accurately and easily installed at a predetermined place where the concrete foundation is constructed. Then, after solidifying the ready-mixed concrete to construct the concrete foundation, remove the formwork and remove the sleeve opening shape retainer and the sleeve internal shape retainer of the bent hole forming tool from the sleeve to reduce the diameter of both sleeves. Therefore, by pulling the inner end of the sleeve from both ends of the bending hole by hand, it can be easily detached from the inner wall surface of the bending hole and the connection of the sleeve is released, so that it can be taken out from the bending hole. Therefore, the bending hole can be formed without leaving the bending hole forming tool in the bending hole.

  And if an existing elbow pipe is inserted into the formed bent hole and a straight pipe is connected to both ends of the elbow pipe, piping such as a drain pipe bent at a predetermined angle can be constructed. Note that the gap between the drain pipe and the bent hole may be filled with sand or the like, and the open end may be filled with mortar. With such a configuration, it is possible to maintain a pipe such as a drain pipe in the bent hole without damaging the concrete foundation during maintenance.

  Since the bending hole forming tool is installed using the permanent magnet equipped on one sleeve opening shape retainer, the work can be performed easily and accurately, and the bending hole forming tool assembled in advance at the time of the work can be used. It is only necessary to magnetically attach to the attachment position, the attachment work itself can be performed in a very short time, and the removal work hardly spends labor, so the work time and work cost can be greatly reduced. Furthermore, it is possible to repeatedly use all the members of the bending hole forming tool such as the sleeve, the sleeve opening shape holding tool, and the sleeve inner shape holding tool.

  The best embodiment of the bending hole forming tool and the bending hole forming method in the concrete foundation according to the present invention will be described below with reference to the drawings. 1 is a central longitudinal sectional view of a bending hole forming tool 1 according to the present invention, FIG. 2 is a central transverse sectional view taken along the line AA in FIG. 1, and FIG. 3 is an installation state of a concrete foundation on a formwork. It is explanatory drawing shown. The bending hole forming tool 1 is wound in a hollow cylindrical shape so that the diameter can be increased and reduced, and a pair of sleeves 2 and 3 each having an elliptical opening 2a and 3a formed at one end, and the other end of the sleeve 2 and 3 Sleeve opening shape retainers 4 and 5 attached to the openings 2b and 3b, and the outer peripheral portions of the sleeves 2 and 3 so that the oval openings 2a and 3a are in close contact with each other to be integrated. By fixing with a sleeve connector 8 such as an adhesive tape, the pair of sleeves 2 and 3 are connected in a bent state at a predetermined angle α (45 degrees in the illustrated example). Further, in the sleeves 2 and 3, the sleeve internal shape holders 6 and 7, which are hollow annular bodies whose outer peripheral surfaces are in close contact with the inner peripheral surfaces of the sleeves 2 and 3, retain the shape of the sleeves 2 and 3. Has been inserted.

  As shown in FIG. 7, along the sinusoidal curve 10 determined by the diameter of the thin plate-like base material 9 having flexibility and being formed into a hollow cylindrical shape and the angles of the elliptical openings 2a and 3a. Cut into material sheets 9a and 9b. The substrate sheets 9a and 9b are wound and heat-treated so as to have the same size as the diameter of the bent hole, and the end portions 2d and 3d are the inner end portions, respectively, and the end portions 2c and 3c are the outer end portions, respectively. The sleeves 2 and 3 are manufactured by winding them into a hollow cylinder so that The material of the sleeves 2 and 3 is not particularly limited as long as it can withstand the placing pressure of ready-mixed concrete and can be removed after the concrete is solidified. Polyamide, PBT, vinyl chloride, ABS resin, nylon having a thickness of about 1 mm. A synthetic resin such as polypropylene is suitable, but other paper or other materials may be used. The diameters of the sleeves 2 and 3 can be appropriately set according to the purpose of use.

  8 is an overall perspective view of the sleeves 2 and 3 manufactured using the base sheets 9a and 9b, FIG. 9 is a side view of the elliptical openings 2a and 3a, and FIG. 10 is a central longitudinal sectional view of FIG. It is. As shown in the figure, the sleeves 2 and 3 are formed by winding the base sheets 9a and 9b only one and a half times, and the outer end portions 2c and 3c are located at the top portion and the inner end portions 2d and 3d are located at the bottom portion. . Thus, since the outer end portions 2c and 3c and the inner end portions 2d and 3d are freely movable end portions, the sleeves 2 and 3 can be expanded and contracted freely. One ends of the sleeves 2 and 3 are opened as elliptical openings 2a and 3a, and the angle β is set to 112.5 degrees in the illustrated example. The other ends of the sleeves 2 and 3 are opened as openings 2b and 3b. Therefore, the oval openings 2a and 3a of the sleeves 2 and 3 are brought into close contact with each other and fixed with a sleeve connector 8 such as an adhesive tape as shown in FIG. They are connected in a bent state at an angle (45 degrees in the illustrated example).

  In this embodiment, the sleeves 2 and 3 have the same shape, but the lengths L1 and L2 of the sleeves 2 and 3 and the diameters of the sleeves 2 and 3 and the angles of the elliptical openings 2a and 3a depend on the concrete foundation to be installed. The design can be changed freely. In other words, the length of the sleeve 2 in the horizontal portion (L1 in FIG. 1) is determined by the width of the vertical portion (upper portion) of the foundation, and the depth and horizontal portion of the foundation (the surface of the inner solid foundation portion or the inner fabric foundation portion). The length of the sleeve 3 at the bent portion (L2 in FIG. 1) is determined by the height of.

  Since these sleeves 2 and 3 are vulnerable to external pressure, and the outer end portions 2c and 3c and the inner end portions 2d and 3d are both free end portions, the predetermined diameter length and form cannot be maintained as they are. Therefore, the sleeve opening shape retainers 4 and 5 are attached to the openings 2 b and 3 b of the sleeves 2 and 3, and the sleeve internal shape retainers 6 and 7 are attached to the inside of the sleeves 2 and 3.

  First, as shown in the overall perspective view of FIG. 12 is an overall perspective view of the sleeve opening shape retainer 4, FIG. 13 is an enlarged cross-sectional view of the main part of FIG. 12, FIG. 14 is a central vertical cross-sectional view of FIG. FIG. 15 is a sectional view taken along line BB in FIG. 14. The sleeve opening shape retainer 4 has a disc-shaped lid surface 4b having an area substantially the same as the area of the opening 2b of the sleeve 2, and a predetermined height vertically provided in the vicinity of the circumferential end of the lid surface 4b. It is comprised from the surrounding wall 4a and the edge part 4d formed in the outer side of this surrounding wall 4a. As shown in FIG. 14, the sleeve opening shape retainer 4 is mounted by fitting the peripheral wall 4a from the outside of the opening 2b of the sleeve 2 and engaging the edge 4d with the end of the opening 2b. By mounting the sleeve opening shape retainer 4 on the wound sleeve 2, the sleeve 2 is retained in a predetermined radial length.

  Two openings 4c are formed in the cover surface 4b of the sleeve opening shape retainer 4. The opening 4c is perpendicular to the hollow ring-shaped peripheral wall 11a and the end of the peripheral wall 11a as shown in FIG. A peripheral wall 11a of a ring-shaped yoke 11 having a hook-shaped cross section composed of a flange portion 11b formed outward is fitted. The collar portion 11b of the ring-shaped yoke 11 protrudes from the cover surface 4b of the sleeve opening shape retainer 4 by the thickness thereof, and a disk-shaped back yoke 12 having a diameter larger than that of the opening portion 4c in the peripheral wall 11a of the ring-shaped yoke 11. The permanent magnet 13 fixed to is fitted into the sleeve opening shape retainer 4. The thickness of the permanent magnet 13 is substantially the same as the cover surface 4b of the sleeve opening shape retainer 4 or slightly thinner than the cover surface 4b, and is located slightly inside the collar portion 11b of the ring-shaped yoke 11. Yes. Reference numeral 4e denotes an operation hole formed in the lid surface 4b of the sleeve opening shape retainer 4 and is used when an appropriate tool is inserted when the sleeve opening shape retainer 4 is removed.

  The permanent magnet 13 has the same shape as that of the saddle yoke by the disk-shaped back yoke 12 disposed on the back surface and the ring-shaped yoke 11 disposed from the outer surface direction, and the magnetic force is increased. It can be stably fixed inside the frame 25. Further, the permanent magnet 13 to which the disc-shaped back yoke 12 is fixed, the ring-shaped yoke 11 and the sleeve opening shape retainer 4 are separate members and can be separated, and can be individually refilled and reused. .

  The permanent magnet 13 is attached by inserting the peripheral wall 11a of the ring-shaped yoke 11 from the outer surface side of the opening 4c formed in the lid surface 4b of the sleeve opening shape retainer 4, and then fixing the disk-shaped back yoke 12 from the inner surface side. The permanent magnet 13 is inserted into the peripheral wall 11a of the ring-shaped yoke 11 and fixed. In the illustrated example, two permanent magnets 13 are used. However, in the case where the sleeve opening shape retainer 4 has a large diameter, three or more permanent magnets 13 may be fixed, or the sleeve opening shape retaining device 4 may be fixed. In the case where the diameter length is small, one permanent magnet 13 may be fixed.

  In contrast to the permanent magnet 13 alone, the permanent magnet 13 with the disk-shaped back yoke 12 has a large magnetic force. Although the permanent magnet 13 itself is fragile and easily broken, it is easy to handle by fixing the disk-shaped back yoke 12, and the ring-shaped yoke 11 directly touches the mold 25 for placing the concrete directly. Thus, the permanent magnet 13 is protected.

  On the other hand, the sleeve opening shape retainer 5 is attached to the opening 3b of the sleeve 3 as shown in the overall perspective view of FIG. 20 is a front view of the sleeve opening shape retainer 5, FIG. 21 is a central longitudinal sectional view of FIG. 19, FIG. 22 is a central transverse sectional view of FIG. 19, and FIG. The sleeve opening shape retainer 5 has a disc-shaped lid surface 5b having an area substantially the same as the area of the opening 3b of the sleeve 3, and a predetermined vertical standing near the circumferential end of the lid surface 5b. It is comprised from the surrounding wall 5a of height, and the edge part 5d formed in the outer side of this surrounding wall 5a. As shown in FIG. 21, the sleeve opening shape retainer 5 is mounted by fitting the peripheral wall 5a from the outside of the opening 3b of the sleeve 3 and engaging the edge 5d with the end of the opening 3b. Reference numeral 5e denotes an operation hole formed in the lid surface 5b of the sleeve opening shape retainer 5 and is used when an appropriate tool is inserted when the sleeve opening shape retainer 5 is removed. By mounting the sleeve opening shape retainer 5 on the wound sleeve 3, the sleeve 3 is retained in a predetermined radial length.

  Two openings 5c are also formed in the lid surface 5b of the sleeve opening shape retainer 5, and the configuration of the sleeve opening shape retaining device 5 is the same as that of the sleeve opening shape retaining device 4. The tools 4 and 5 can use a common member. However, in the sleeve opening shape retainer 5, the permanent magnet 13, the ring-shaped yoke 11, and the disk-shaped back yoke 12 are not required in the opening 5c. As will be described later, since the sleeve 3 is installed so as to be exposed from the inner horizontal surface at a position where the inner horizontal surface of the foundation concrete is formed, it is not necessary to be magnetically attached to the mold using a permanent magnet. It is. Therefore, the opening 5c is originally unnecessary, but it is convenient for inserting a finger or a tool when the sleeve opening shape retainer 5 is installed or removed, and the same member as the sleeve opening shape retainer 4 can be used. Therefore, it is more convenient to form it.

  Further, in the sleeves 2 and 3, as shown in FIGS. 1 to 3, 14, 15, 21, and 22, the sleeve internal shape retainer 6 for retaining the shape of the sleeves 2 and 3. 7 is detachably equipped. 17 is a front view of the sleeve internal shape holders 6 and 7, and FIG. 18 is a central longitudinal sectional view of FIG. The sleeve internal shape holders 6 and 7 are hollow annular bodies whose outer peripheral surfaces 6a and 7a having a predetermined W are supported in close contact with the inner peripheral surfaces of the sleeves 2 and 3, and operation holes 6c and 7c are formed in the central portion. The hanging pieces 6b and 7b are formed between the outer peripheral surfaces 6a and 7a and the operation holes 6c and 7c. The installation location of the sleeve internal shape retainers 6 and 7 is not particularly limited, but for the shape retention of the sleeves 2 and 3, the sleeve internal shape retainers 6 and 7 are installed between the central portions of the sleeves 2 and 3 and the elliptical openings 2 a and 3 a. It is preferable. Although the sleeve internal shape retainers 6 and 7 have pressure resistance against a load applied in the center direction, if a tool or a finger is inserted into the operation holes 6c and 7c and pulled, distortion occurs and the sleeve internal shape retainers 6 and 7 can be easily detached from the sleeves 2 and 3. Therefore, as the material for the sleeve internal shape retainers 6 and 7, a material having flexibility as well as shape retention is appropriate.

  In this way, the sleeve 2 having the sleeve opening shape retainer 4 in the opening 2b, the sleeve 2 having the sleeve internal shape retainer 6 therein, the sleeve opening shape retainer 5 in the opening 3b, and the sleeve internal shape retainer 7 in the inside. 1 and 2 are fixed in close contact with each other by a sleeve connector 8 such as an adhesive tape, and the predetermined angle α shown in FIGS. 1 and 2 (45 degrees in the illustrated example). ) Can be obtained. Next, a method for forming a bent hole in a concrete foundation using the bent hole forming tool 1 will be described. Note that the sleeve connector 8 only needs to be able to fix the sleeves 2 and 3, and may be equipped not only when the sleeves are mounted on the entire circumference of the closely closed elliptical openings 2 a and 3 a, but also when they are partially installed. Good.

  FIG. 3 is an explanatory view showing a state in which the bending hole forming tool 1 is installed in the foundation form before placing the raw cleat in order to form the bending hole 24 for the drain pipe in the foundation concrete, and FIG. FIG. 5 is an explanatory view showing a state in which ready-mixed concrete is placed, and FIG. 5 is an explanatory view showing a state in which the bent hole forming tool 1 is removed after the ready-mixed concrete is solidified. In the figure, 21 is a crushed crushed stone. A mold 25 is formed on the crushed stone 21 to form the outer vertical surface of the vertical portion 22 of the foundation, and the main muscle 27 and the stirrup muscle 28 are arranged. The mold 26 for forming the inner vertical surface is fixed. Reference numeral 30 denotes a slab reinforcement arranged to construct the horizontal portion 23. These various bar arrangements are the same as before.

  Then, the various reinforcing bars at the place where the bent hole 24 is formed and the necessary reinforcing bars are not cut, and a space for inserting the bent hole forming tool 1 is secured, and the reinforcing bars 29 are provided as necessary. Reinforce. The bending hole forming tool 1 is installed with the sleeve 2 in a horizontal state and the sleeve 3 in an inclined state in the space thus secured, and the permanent magnet 13 of the sleeve opening shape retainer 4 is magnetically attached to the inside of the mold 25. To fix in place. In addition, as a material of the mold 25, a material on which the permanent magnet 13 can be magnetically attached is used. In this state, the sleeve opening shape retainer 5 side of the sleeve 3 is installed in a state of protruding from the horizontal portion 23.

  Since the pressure and buoyancy of the ready-mixed concrete 20 to be placed act on the permanent magnet 13 according to the principle of the insulator, the installation position of the bending hole forming tool 1 is accurately determined only by fixing the sleeve opening shape retainer 4 with the permanent magnet 13. It is conceivable that it cannot be secured. Therefore, the sleeve 3 is fixed to a rebar in the vicinity of the slab bar 30 or the like with a known sleeve band 16. The configuration of the sleeve band 16 is not particularly limited, and any configuration may be used as long as the sleeve 3 can be fixed to a nearby reinforcing bar. Moreover, it is sufficient to connect only with a connecting tool of an appropriate material such as a wire. By fixing the sleeve opening shape retainer 4 and the sleeve band 16, it is possible to sufficiently withstand the pressure and vibration when the ready-mixed concrete 20 is placed. By using the permanent magnet 13, it is possible to easily arrange the bending hole forming tool 1 at a desired position. Once the mounting position of the bending hole forming tool 1 is determined, the distance from various reinforcing bars is measured and made permanent. It is only necessary to magnetically attach the magnet 13 to the mold 25, and the attaching operation itself can be performed in a very short time.

  Next, as shown in FIG. 4, the ready-mixed concrete 20 is placed in the spaces in the molds 25 and 26 and the horizontal portion 23, and cured for a predetermined period to be solidified. After solidification, the mold 25 is removed to expose the sleeve opening shape retainer 4, and a hook-shaped metal fitting or other tool is inserted into the operation hole 4e to remove the sleeve opening shape retaining device 4. Similarly, a hook-shaped metal fitting or other tool is inserted into the operation hole 5e of the sleeve opening shape retainer 5 exposed from the horizontal portion 23, and the sleeve opening shape retaining device 5 is removed. Next, a tool or a hand is inserted from the openings 2b and 3b of the sleeves 2 and 3 into the operation holes 6c and 7c of the sleeve internal shape retainers 6 and 7, and the sleeve internal shape retainers 6 and 7 are bent to open the openings. Take out from 2b, 3b. Since the sleeve opening shape retainer 4 is magnetically attached to the mold 25, it may be detached from the sleeve 2 when the mold 25 is removed.

  In this state, the sleeves 2 and 3 are energized so as to be reduced in diameter from the inner end portions 2d and 3d because the sleeve opening shape retainers 4 and 5 and the sleeve inner shape retainers 6 and 7 are not present. Has been. Therefore, if the sleeves 2 and 3 are pulled inside while being wound inward, that is, rotated in the direction of reducing the diameter, the sleeves 2 and 3 are easily released from the connection by the sleeve connector 8 such as an adhesive tape. Thereafter, while reducing the diameter of the sleeves 2 and 3, the sleeve 3 is taken out from the opening 24a on the vertical portion 22 side of the bent hole 24 formed with the sleeve 2, and the sleeve 3 is taken out from the opening 24b on the horizontal portion 23 side. By taking out, a bent hole 24 bent at a predetermined angle is formed as shown in FIG. The taken out sleeves 2, 3, sleeve opening shape retainers 4, 5, sleeve internal shape retainers 6, 7, etc. can all be reused repeatedly. In the above embodiment, the ready-mixed concrete 20 is placed on the vertical portion 22 and the horizontal portion 23 at the same time. However, the lower portion is first placed below the horizontal portion 23 and the vertical portion 22 is placed thereafter. It may be fast. Further, although the solid portion in which the slab reinforcement 30 is arranged in the horizontal portion 23 is also used, a configuration in which moisture-proof concrete is cast and soil concrete is provided without arranging the horizontal portion 23 may be used.

  The elbow pipe 31 having a predetermined angle is inserted from the opening 24a on the vertical part 22 side or the opening 24b on the horizontal part 23 side of the bent hole 24 formed in this way, and is positioned at the bent part. The bending tube 34 can be installed in the bending hole 24 by inserting and fixing the tubes 32 and 33. The straight pipe 32 exposed from the outer vertical surface of the vertical portion 22 is connected to an elbow pipe 35 and a straight pipe 36 at a predetermined angle according to the piping situation, and piped to a drainage basin outside the building. On the other hand, the straight pipe 33 exposed from the inner end of the horizontal portion 23 is connected to a pipe from a drainage facility in the building by connecting an elbow pipe 37 and a straight pipe 38 at a predetermined angle according to the piping situation. In addition, without using the elbow tube 31, it is also possible to insert a bent tube that can be bent flexibly or a bent tube bent in advance.

  The gap between the bent hole 24 and the bent pipe 34 is filled with a filler 39 such as sand, and the gap in the opening 24a and the opening 24b is filled with mortar 40 or the like to complete the construction. As a result, the gap between the bent hole 24 and the bent pipe 34 is closed, so that there is no problem in terms of ant protection, and even if it is necessary to replace the bent pipe 34, the foundation concrete is affected. It can be easily replaced or repaired and inspected without any problems.

  In addition, since the influence which the bending hole 24 has on the intensity | strength of foundation concrete is large, it is preferable to make the diameter of the bending hole 24 as small as possible. Therefore, it is preferable that the elbow pipe 31 inserted through the bent portion of the bent hole 24 has a minimum dimension that can be inserted. As a result, it is possible to minimize construction difficulties such as the influence of the strength on the concrete structure, the covering of the concrete from the bent holes 24 to the various reinforcing bars, the balance with the ground level, and the like, which has high practicality.

  According to the bent hole forming tool and the bent hole forming method in the concrete foundation according to the present invention, a bent hole for a drain pipe or the like can be easily constructed in the foundation concrete without using a sheath pipe left in the concrete. Can do. In other words, the angle of the bent hole to be constructed can be freely set by selecting the shape of the oval opening of the sleeve, and the diameter and shape of the sleeve can be set in the sleeve opening shape holder and the sleeve. The shape can be retained by a sleeve internal shaper placed on the sleeve. Therefore, by connecting the two sleeves, a bent hole forming tool that is easily bent at a predetermined angle can be obtained.

  And, using a permanent magnet attached to one of the sleeve opening shape holders, the outer vertical surface of the concrete foundation is fixed to the formwork for placing concrete in the place where it should be formed, and the inner horizontal surface is formed. By fixing the other sleeve opening shape retainer so as to be exposed from the inner horizontal surface at the place to be done, it can be accurately and easily installed at a predetermined place where the concrete foundation is constructed. Then, after solidifying the ready-mixed concrete to construct the concrete foundation, remove the formwork and remove the sleeve opening shape retainer and the sleeve internal shape retainer of the bent hole forming tool from the sleeve to reduce the diameter of both sleeves. Therefore, by pulling the inner end of the sleeve from both ends of the bending hole by hand, it can be easily detached from the inner wall surface of the bending hole and the connection of the sleeve is released, so that it can be taken out from the bending hole. Therefore, the bending hole can be formed without leaving the bending hole forming tool in the bending hole.

  And if an existing elbow pipe is inserted into the formed bent hole and a straight pipe is connected to both ends of the elbow pipe, piping such as a drain pipe bent at a predetermined angle can be constructed. Note that the gap between the drain pipe and the bent hole may be filled with sand or the like, and the open end may be filled with mortar. With such a configuration, it is possible to maintain a pipe such as a drain pipe in the bent hole without damaging the concrete foundation during maintenance.

  Since the bending hole forming tool is installed using the permanent magnet equipped on one sleeve opening shape retainer, the work can be performed easily and accurately, and the bending hole forming tool assembled in advance at the time of the work can be used. It is only necessary to magnetically attach to the attachment position, and the attachment work itself can be performed in a very short time, so that the removal work hardly spends labor, and the work time and work cost can be greatly reduced. Furthermore, it is possible to repeatedly reuse all members of the bending hole forming tool such as the sleeve, the sleeve opening shape holding tool, and the sleeve inner shape holding tool.

The center longitudinal cross-sectional view of the bending hole formation tool concerning this invention. The center cross-sectional view which follows the AA line of FIG. Explanatory drawing which shows the condition installed in the foundation formwork before placing concrete. Explanatory drawing which shows the state which cast concrete. Explanatory drawing which shows the state which removed the bending hole formation tool after solid concrete solidification. Explanatory drawing which shows the construction state of a bending pipe. The top view of a base material. The whole perspective view of a sleeve. The side view by the side of the elliptical opening part of a sleeve. The center longitudinal cross-sectional view of FIG. The whole perspective view of the sleeve which attached the sleeve opening shape holder. The whole perspective view of a sleeve opening shape holder. The principal part expanded sectional view of FIG. The center longitudinal cross-sectional view of FIG. The center cross-sectional view of FIG. BB sectional drawing of FIG. The front view of a sleeve internal shape holder. The center longitudinal cross-sectional view of FIG. The whole perspective view of a sleeve. The front view of a sleeve opening shape holder. The center longitudinal cross-sectional view of FIG. FIG. 20 is a central cross-sectional view of FIG. 19. CC sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bending hole formation tool 2, 3 ... Sleeve 2a, 3a ... Elliptical opening 2b, 3b, 4c, 5c ... Opening 2c, 3c ... Outer end 2d, 3d ... Inner end 4, 5 ... Sleeve opening maintenance Shaped tool 4a, 5a ... Peripheral wall 4b, 5b ... Cover surface 4d, 5d ... Edge 4e, 5e ... Operation hole 6, 7 ... Sleeve internal shape holder 6a, 7a ... Outer peripheral surface 6b, 7b ... Drooping piece 6c, 7c ... Operating hole 8 ... Sleeve connector 9 ... Base material 9a, 9b ... Base material sheet 10 ... Sine curve 11 ... Ring-shaped yoke 11a ... Surrounding wall 11b ... Bridge 12 ... Disk-like back yoke 13 ... Permanent magnet 16 ... Sleeve band 20 ... Ready-mixed concrete 21 ... Crushed stone 22 ... Vertical part 23 ... Horizontal part 24 ... Bending holes 24a and 24b ... Openings 25 and 26 ... Formwork 27 ... Main reinforcement 28 ... Stirrup reinforcement 29 ... Reinforcement reinforcement 30 ... Slab reinforcement 31, 35, 37 ... Bo tubes 32,33,36,38 ... straight pipe 34 ... bending pipe 39 ... packing 40 ... mortar

Claims (12)

  Two sleeves, which are formed by winding a base sheet into a hollow cylinder so that the diameter can be increased or decreased, are connected to each other so that the openings are bent at a predetermined angle. A bending hole forming tool in a concrete foundation, characterized by being equipped with a tool.   A pair of sleeves in which a base sheet is wound into a hollow cylindrical shape so that the diameter can be increased and reduced, and an elliptical opening is formed at one end; and a sleeve opening shape retainer attached to the opening at the other end of the sleeve; A bending hole forming tool in a concrete foundation, comprising: a pair of sleeves connected so as to bend at a predetermined angle by fixing the oval openings of the sleeves in close contact with each other.   The bending hole forming tool in a concrete foundation according to claim 1 or 2, wherein the sleeve is fixedly connected by a sleeve connector.   By attaching a permanent magnet to at least one of the sleeve opening shape holders, the sleeve opening shape holding device is magnetically attached to a formwork for placing concrete in a place where a bending hole of a concrete foundation should be formed by the permanent magnet. The bending hole forming tool in a concrete foundation according to claim 1, 2 or 3.   The sleeve opening shape retainer includes a disk-shaped lid surface, a peripheral wall of a predetermined height that stands vertically in the vicinity of the circumferential end of the lid surface, and an edge formed on the outer side of the peripheral wall. A bending hole forming tool in a concrete foundation according to claim 1, 2, 3, or 4.   6. The bending hole forming tool for a concrete foundation according to claim 5, wherein at least one of the sleeve opening shape retainers has an opening formed in a lid surface, and a permanent magnet with a back yoke is attached to the opening.   The bending hole forming tool in a concrete foundation according to claim 1, 2, 3, 4, 5 or 6, wherein a sleeve internal shape retainer for shaping the shape of the sleeve is disposed in the sleeve.   8. The bending hole forming tool in a concrete foundation according to claim 7, wherein the sleeve internal shape retainer is a hollow annular body whose outer peripheral surface is in close contact with the inner peripheral surface of the sleeve.   9. The concrete foundation according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the sleeve is reduced in diameter by removing the sleeve opening shape retainer or the sleeve opening shape retainer and the sleeve internal shape retaining device. Bending hole forming tool.   10. A synthetic resin such as polyamide, PBT, ABS resin, nylon, polypropylene or the like is used as a material for the sleeve and / or sleeve opening shape retainer, according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9. Bending hole forming tool for concrete foundations.   11. A mold for placing concrete in a concrete foundation according to any one of claims 1 to 10, wherein the sleeve opening shape retainer of the bending hole forming tool in the concrete foundation is located at a location where the outer vertical surface of the concrete foundation is to be formed. Fix to the frame and fix the other sleeve opening shape fixer so that it is exposed from the inner horizontal plane at the place where the inner horizontal plane is formed. Bending in a concrete foundation characterized by forming bent holes for inserting various pipes such as drain pipes between the outer vertical surface and the inner horizontal surface in the concrete foundation of the building by sequentially removing the hole forming tools Hole formation method.   After the ready-mixed concrete is solidified, remove the ready-made concrete casting form at the place where the outer vertical surface should be formed, and then the sleeve opening shape holder, or the sleeve opening shape holder and the inside of the sleeve placed in the sleeve The method for forming a bent hole in a concrete foundation according to claim 11, wherein the sleeve can be removed by reducing the diameter by removing the shape retainer.

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