JP2012052328A - Inclined-hole forming tool and method in concrete foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inclined-hole forming tool and method in a concrete foundation for forming a straight cylindrical inclined hole therethrough for inserting various pipes, such as drain pipes, in the concrete foundation of a building constructed by using a formwork, the hole being inclined at a predefined angle so that the hole becomes lower toward the outside direction of the concrete foundation in the vertical direction.SOLUTION: There is provided an inclined-hole forming tool 1 in a concrete foundation comprising a sleeve 2 formed by winding a base material sheet 5 into a hollow cylindrical shape so as to be expanded and contracted and a pair of retention tools 3 and 4 each of which is a lid-clad cylindrical body provided with an oval lid faces 3a or 4a in inclination at one end, with the pair of retention tools 3 and 4 mounted into both-end openings 2a and 2b of the sleeve 2 so that the lid faces 3a and 4a are mutually parallel. There is also provided an inclined-hole forming method using the inclined-hole forming tool 1.

Description

  The present invention has a straight tubular inclined hole for inserting various pipes such as drain pipes in a concrete foundation of a building constructed using a mold so that the outer direction of the concrete foundation is downward in the vertical direction. The present invention relates to an inclined hole forming tool and an inclined hole forming method in a concrete foundation for inclining and forming at a predetermined angle.

  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-hole for ventilation pipes does not need to have a gradient, and there are relatively few restrictions on the installation location. On the other hand, it is desirable to bury the through holes for drainage pipes in the ground from the viewpoints of aesthetics of the exterior of the building, damage to piping, effective use of the site, etc. Therefore, it is necessary to incline and form at a predetermined angle so that the outer direction of the concrete foundation is downward. In other words, it is necessary to form the opening inside the concrete foundation at a higher position in the vertical direction than the opening in the outside direction.

  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. Alternatively, it is called the pit construction method. It is formed 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. A rectangular parallelepiped space where no concrete is placed was used as a space for installing a 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.

  Furthermore, recently, before placing concrete for foundation, after placing a sheath pipe in a predetermined location in the foundation reinforcing bar, concrete is buried and the sheath pipe is buried, 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. For piping to structures such as concrete walls by fixing the piping members in the object to the concrete casting form at the place where it should be laid and removing the hole forming tool after removing the form after solidifying the concrete Has been proposed (Patent Document 3). After that, a straight pipe member is inserted into the hole. According to this method, since the sleeve mounting tool of the hole forming tool is brought into 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 tool is in close contact with the formwork, it is not covered with concrete, and the time for attaching and removing the hole forming tool can be shortened, thereby shortening the construction period.

  Further, the applicant of the present application utilizes the configuration of Patent Document 3 to wind a base sheet into a hollow cylindrical shape so that the diameter and diameter of the base sheet can be increased, and a pair of sleeves having an elliptical opening at one end, and a sleeve A sleeve opening shape retainer attached to the opening at the other end of the sleeve, and the ellipsoidal opening of the sleeve is fixed in close contact with each other so that the pair of sleeves are bent so as to bend at a predetermined angle. A hole forming tool has been proposed (Patent Document 4). According to such a configuration, the through hole for inserting various pipes can be easily formed as a bent hole that bends at a predetermined angle.

JP 2002-54203 A JP 2004-44170 A JP 2006-307447 A JP 2009-35982 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. In addition, the pit construction method only needs to remove the mortar from the boxed portion 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 Inferior. In addition, the pit construction method itself takes time to install the box, and removing it requires destroying the box, which requires troublesome labor, materials, and labor. It is adopted in.

  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 Law” enforced in June 2000. . However, the sheath tube itself is buried in the foundation concrete and cannot be reused, and the flexible tube as a drain tube inserted into the sheath tube has a special structure, and is a normal vinyl chloride. It is extremely expensive compared to the drainage pipe made of metal. 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.

  Further, since the bent pipe shown in Patent Document 4 has a shape in which the through hole is bent, the volume is increased by the amount of bending compared to the straight tubular through hole, and the concrete is lost by that amount. The part of will increase. The same applies to Patent Documents 1 and 2. Therefore, in order to minimize the loss of concrete in the concrete foundation portion that has been strongly demanded recently, it is not possible to satisfy the requirement to minimize the volume of the through hole.

  The “Housing Quality Assurance Promotion Law” states that “exclusive piping can be inspected and repaired without affecting the structure”, that is, “underground pipes such as drain pipes are It must be satisfied that it is not embedded in the concrete foundation. Therefore, the following matters are strongly demanded recently. First, (1) To form through holes for piping installation that can satisfy the requirements of the “Housing Quality Assurance Promotion Law” when constructing concrete foundations. (2) Minimize the loss of concrete in the concrete foundation. (3) Do not damage the reinforcing bars placed in the concrete foundation when forming through-holes. (4) Install the through holes accurately. (5) The installation work can be performed easily and in a short time.

  Therefore, the present invention eliminates the problems of the conventional drain pipe forming method, and does not use a sheath pipe and minimizes the loss of concrete in the foundation portion, so that the through hole is a straight pipe. In addition to satisfying the standards indicated by the “Housing Quality Assurance Promotion Law”, the inclined hole forming tool and the inclined hole forming method in a concrete foundation that can be reused and do not require time and labor for construction are provided. The purpose is to provide.

  In order to achieve the above object, the present invention is a sleeve formed by winding a base sheet into a hollow cylinder so that the diameter of the base sheet can be increased and reduced, and a covered cylinder, and an elliptical cover surface is obliquely provided at one end. Provided on the basis of an inclined hole forming tool in a concrete foundation in which a pair of shape retaining tools are mounted at both ends of the sleeve so that the lid surfaces are parallel to each other. To do. In addition, a sleeve formed by winding a base sheet into a hollow cylinder so that the diameter of the base sheet can be increased and reduced, and a covered cylinder, an elliptical cover surface is obliquely provided at one end, and an insertion edge is provided at the other end And a pair of shape retainers, the insertion edges of the pair of shape retainers being inserted into the openings at both ends of the sleeve so that the lid surfaces are parallel to each other, and the pair of shape retainers An inclined hole forming tool in a concrete foundation, which is tightened by a sleeve, is provided.

  Then, a body having a circular cross section is continuously provided on the cover surface of the shape retainer, and an insertion edge is projected from the open end of the body, and the cover surfaces of the pair of shape retainers are 40 in the sleeve direction. A configuration in which the sleeve is inclined by 50 ° to 50 ° and a configuration in which the wound state of the sleeve is held by a pair of shape retainers are provided. In addition, at least one of the pair of shape retainers is equipped with a permanent magnet, and the permanent magnet can be attached to the formwork for placing the ready-mixed concrete with an inclined hole forming tool, and the pair of shape retainers is removed. Thus, a configuration in which the sleeve is reduced in diameter and a configuration using a synthetic resin such as polyamide, PBT, AES / ABS resin, nylon, or polypropylene as the material of the sleeve and / or the shape retainer are provided.

  Further, the pair of shape retainers of the inclined hole forming tool in the concrete foundation having the above-described configuration is placed on the outer mold form and the inner mold form for placing the concrete foundation in the ready-mixed concrete, and the outer mold form direction is downward in the vertical direction. After placing the concrete, the ready-mixed concrete is placed between the outer formwork and the inner formwork, and after the placed ready-mixed concrete is solidified, the outer formwork, the inner formwork, and the inclined hole forming tool are sequentially removed, thereby constructing the building. An inclined hole forming method in a concrete foundation for forming a straight tubular inclined hole for inserting a pipe into a concrete foundation of the present invention is provided.

  In addition, after installing one shape retainer on the outer formwork for placing the ready-mixed concrete in the place where the outer vertical surface of the concrete foundation should be formed, the outer formwork direction is downward in the vertical direction, The ready-mixed concrete is placed and solidified to the inner horizontal plane, and then the inner mold for placing the ready-mixed concrete is installed at the place where the inner vertical plane should be formed, and the ready-mixed concrete is placed between the outer mold and the inner mold. In a concrete foundation that forms a straight tubular inclined hole for inserting a pipe into a concrete foundation of a building by sequentially removing the outer formwork, the inner formwork and the inclined hole forming tool after being cast and solidified. Provided a method for forming an inclined hole, and when removing the inclined hole forming tool, after removing the outer mold frame and the inner mold frame, the sleeve can be taken out by reducing the diameter by removing the pair of shape retainers. It was.

  According to the inclined hole forming tool and the inclined hole forming method in the concrete foundation according to the present invention, the angle of the inclined hole to be constructed is selected by selecting the inclined angle of the elliptical cover surface obliquely provided on the pair of shape retainers. Can be freely set, and a through hole having a set oblique angle can be formed as a straight tubular inclined hole. Therefore, through holes for drainage pipes and the like can be formed with a minimum of concrete defects without using a sheath pipe left in the concrete.

  And after installing a pair of shape holders on the outer mold and the inner mold for placing the concrete foundation on the ready-mixed concrete so that the outer mold direction is downward in the vertical direction, the ready-mixed concrete is placed on the outer mold And after removing the outer mold and the inner mold after solidifying the cast ready-mixed concrete, removing the pair of shape retainers, reducing the diameter of the sleeve and removing it, The inclined hole can be formed without leaving the inclined hole forming tool in the inclined hole.

  Since the inclined hole forming tool is installed using the permanent magnet equipped on one of the shape retainers, the work can be performed easily and accurately, and the inclined hole forming tool that has been assembled in advance during the work can be mounted. The attachment work itself can be performed in an extremely short time, and the removal work requires little labor, so the work time and work cost can be greatly reduced. Furthermore, it is possible to repeatedly use all the members of the inclined hole forming tool including the sleeve and the shape retainer.

The whole front view of the inclined hole formation tool concerning this invention. AA sectional drawing of FIG. Explanatory drawing which shows the assembly | attachment state of an inclination hole formation tool. The whole perspective view of a sleeve. The side view of a sleeve. BB sectional drawing of FIG. The whole perspective view of a 1st shape retainer. The front view of a 1st shape retainer. The side view of the cover surface side of a 1st shape retainer. The side view of the insertion edge part side of a 1st shape retainer. CC sectional drawing of FIG. DD sectional drawing of FIG. The whole perspective view of the 2nd shape retainer. The front view of a 2nd shape retainer. The side view by the side of the lid surface of a 2nd shape retainer. The side view of the insertion edge part side of a 2nd shape retainer. EE sectional drawing of FIG. Explanatory drawing which shows the condition which installed the inclined hole formation tool in the outer side formwork. Explanatory drawing which shows the condition which laid the concrete to the slab surface. Explanatory drawing which shows the state which installed the inner formwork. Explanatory drawing which shows the state which completed the placement of ready-mixed concrete. Explanatory drawing of the removal method of an inclination hole formation tool. Explanatory drawing which shows the completed inclined hole. Explanatory drawing which shows the construction situation of an inclined pipe.

  Embodiments of an inclined hole forming tool and an inclined hole forming method in a concrete foundation according to the present invention will be described below with reference to the drawings. 1 is an overall front view of an inclined hole forming tool 1 according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an explanatory view showing an assembled state of the inclined hole forming tool 1. The inclined hole forming tool 1 is wound in a hollow cylindrical shape so that the diameter can be increased or reduced, and a sleeve 2 having openings 2a and 2b formed at both ends, and a first attached to one opening 2a of the sleeve 2. It consists of a shape retainer 3 and a second shape retainer 4 attached to the other opening 2 b of the sleeve 2.

  4 is an overall perspective view of the sleeve 2, FIG. 5 is a side view of the sleeve 2, and FIG. 6 is a sectional view taken along line BB in FIG. 5. It is manufactured by winding it into a hollow cylinder by winding and heat-treating it so that it can be expanded and contracted, including the same length as the length. As shown in the figure, the sleeve 2 is formed by winding a base sheet 5 a predetermined number of times (in the illustrated example so as to exceed two laps), and the outer end 2c and the inner end 2d are movable free ends. Therefore, the diameter can be freely expanded and reduced, and the diameter of the sleeve 2 can be appropriately set according to the purpose of use. In addition, it is always urged | biased in the diameter reduction direction and exists in a diameter reduction state, and it can expand in diameter by changing the position of the outer side edge part 2c and the inner side edge part 2d. Circular openings 2 a and 2 b are formed at both ends of the sleeve 2.

  Since the sleeve 2 is vulnerable to external pressure, and the outer end 2c and the inner end 2d are both free ends, it is impossible to maintain a predetermined diameter and shape suitable for the inclined hole to be formed as it is. Accordingly, the first shape retainer 3 is attached to one opening 2a of the sleeve 2 and the second shape retainer 4 is attached to the other opening 2b of the sleeve 2, thereby forming a wound state of the sleeve 2. A predetermined diameter and shape suitable for the inclined hole are maintained. That is, the insertion edges 3d and 4d of the first shape retainer 3 and the second shape retainer 4 as a pair of shape retainers are arranged at both end openings 2a and 2b of the sleeve 2, and the cover surfaces 3a and 4a are parallel to each other. The inclined hole forming tool 1 is constituted by inserting the first shape retaining tool 3 and the second shape retaining tool 4 as a pair of shape retaining tools and fastening them with the sleeve 2.

  FIG. 7 is an overall perspective view of the first shape retainer 3, and FIG. 8 is a front view thereof. The first shape retainer 3 is a hollow, covered cylindrical body, and an elliptical lid surface 3a is inclined at one end at an angle α (45 degrees in the illustrated example) in the direction of the sleeve 2, and the lid A body 3b having a circular cross section is connected to the surface 3a. Since the lid surface 3a is inclined in the direction of the sleeve 2 by the angle α, the trunk portion 3b has a triangular shape in front view as shown in FIG. An insertion edge 3d having a diameter smaller than that of the open end 3c is projected from the open end 3c of the body 3b. As shown in FIG. 3, the insertion edge 3 d is inserted so that the opening 2 a of the sleeve 2 is slightly enlarged in diameter, and then the sleeve 2 is reduced in diameter and attached so as to be in close contact with the inner peripheral surface of the sleeve 2. The sleeve 2 to be reduced in diameter is regulated by the insertion edge portion 3d, and the sleeve 2 is held in a predetermined radial length. In the illustrated example, the insertion edge 3d is formed in a hollow cylindrical shape and protruded around the entire circumference of the open end 3c. However, any shape may be used as long as the opening 2a of the sleeve 2 can be retained.

  Two openings 3e are formed in the lid surface 3a of the first shape retainer 3. The opening 3e is perpendicular to the hollow ring-shaped peripheral wall 6a and the end of the peripheral wall 6a as shown in FIG. A ring-shaped yoke 6 having a bowl-shaped cross section comprising a flange 6b formed outward is fitted. The collar portion 6b of the ring-shaped yoke 6 protrudes from the lid surface 3a of the first shape retainer 3 by the thickness thereof, and a disk-shaped back yoke 7 having a diameter larger than the opening 3e is formed in the peripheral wall 6a of the ring-shaped yoke 6. The permanent magnet 8 fixed to is fitted into the first shape holder 3. The thickness of the permanent magnet 8 is substantially the same as the lid surface 3a of the first shape retainer 3, or is slightly thinner than the peripheral wall 6a of the ring-shaped yoke, and is slightly inside the collar portion 6b of the ring-shaped yoke 6. Is located. Reference numeral 3f denotes an operation hole formed in the lid surface 3a of the first shape retainer 3, and an appropriate tool is inserted and used when the first shape retainer 3 is removed.

  The permanent magnet 8 has a disk-like back yoke 7 disposed on the back surface and a ring-shaped yoke 6 disposed from the outer surface direction so as to have the same shape as that of the saddle yoke. The inside of the mold 10 can be stably fixed. Further, the permanent magnet 8 to which the disc-shaped back yoke 7 is fixed, the ring-shaped yoke 6 and the first shape retainer 3 are separate members and can be separated, and can be replenished and reused individually. . If other fixing means for the magnet is used, the ring-shaped yoke 6 and the disk-shaped back yoke 7 can be omitted.

  The permanent magnet 8 is attached by inserting the peripheral wall 6a of the ring-shaped yoke 6 from the outer surface side of the opening 3e formed in the lid surface 3a of the first shape retainer 3, and then fixing the disk-shaped back yoke 7 from the inner surface side. The permanent magnet 8 is inserted into the peripheral wall 6a of the ring-shaped yoke 6 and fixed. In the illustrated example, two permanent magnets 8 are used. However, in the case where the first shape retainer 3 has a large diameter, three or more permanent magnets 8 may be fixed, or the first shape retainer 3 may be fixed. In the case where the diameter length is small, one permanent magnet 8 may be fixed.

  Compared with the permanent magnet 8 alone, the permanent magnet 8 with the disk-like back yoke 7 has a large magnetic force. Although the permanent magnet 8 itself is fragile and easily broken, it is easy to handle by fixing the disk-shaped back yoke 7, and the ring-shaped yoke 6 allows the permanent magnet 8 to be directly attached to the outer formwork 10 for placing concrete. The permanent magnet 8 is protected because it is not touched.

  FIG. 13 is an overall perspective view of the second shape retainer 4, and FIG. 14 is a front view thereof. The second shape retainer 4 is a hollow covered cylindrical body, and at one end, an elliptical lid surface 4a is inclined at an angle β (45 degrees in the illustrated example) in the sleeve 2 direction, and this lid is provided. The body 4b having a circular cross section is connected to the surface 4a. Since the lid surface 4a is inclined in the direction of the sleeve 2 by an angle β, the trunk portion 4b has a triangular shape in a front view as shown in FIG. An insertion edge 4d having a diameter smaller than that of the open end 4c is projected from the open end 4c of the body 4b. As shown in FIG. 3, the insertion edge portion 4 d is inserted so that the opening 2 b of the sleeve 2 is slightly enlarged in diameter, and then the sleeve 2 is reduced in diameter and attached so as to be in close contact with the inner peripheral surface of the sleeve 2. The sleeve 2 to be reduced in diameter is regulated by the insertion edge portion 4d, and the sleeve 2 is held in a predetermined radial length. In the illustrated example, the insertion edge portion 4d is formed in a hollow cylindrical shape and protruded around the entire circumference of the open end portion 4c. However, any shape may be used as long as the opening portion 2b of the sleeve 2 can be retained. Reference numeral 4e denotes an operation hole formed in the lid surface 4a of the second shape retainer 4. When the second shape retainer 4 is removed, an appropriate tool is inserted and used. Therefore, the second shape retainer 4 has a symmetrical shape with the first shape retainer 3 except for the configuration related to the permanent magnet 8.

  The angle α for obliquely installing the lid surface 3a of the first shape retaining tool 3 and the angle β for obliquely installing the lid surface 4a of the second shape retaining tool 4 can be set to arbitrary angles. Must be set to the same angle. This is because it is necessary to mount the sleeve 2 so that the lid surfaces 3a and 4a are parallel to each other. In addition, as a preferable setting angle of the angles α and β, a range of 40 degrees to 50 degrees is appropriate.

  The material of the sleeve 2, the first shape retainer 3 and the second shape retainer 4 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, and the thickness is 1 mm. Synthetic resins such as polyamide, PBT, vinyl chloride, AES / ABS resin, nylon, and polypropylene are suitable, but other paper and other materials may be used. The diameter of the sleeve 2 can be appropriately set according to the purpose of use.

  As shown in FIGS. 1 and 3, the lid surface 3a of the first shape retainer 3 attached to the opening 2a of the sleeve 2, and the lid surface 4a of the second shape retainer 4 attached to the opening 2b. The first shape retainer 3 and the second shape retainer 4 are attached to the sleeve 2 such that the inclined hole forming device 1 is assembled. Therefore, the inclined hole forming tool 1 is positioned in a state where it is inclined at a predetermined angle when the lid surfaces 3a, 4a are suspended in the vertical direction.

  Next, a method for forming an inclined hole in a concrete foundation of a building using the inclined hole forming tool 1 will be described. FIG. 18 is an explanatory view showing a situation in which the inclined hole forming tool 1 is installed in the outer mold 10 before placing the raw concrete in order to form an inclined hole for the drain pipe in the basic concrete, and FIG. 19 is an inner side of the basic concrete. FIG. 20 is an explanatory view showing a state in which the ready-mixed concrete is placed up to the horizontal surface 12 (slab surface), FIG. 20 is an explanatory view showing a state in which the inner mold 11 is installed, and FIG. 21 is an explanatory view showing a state in which the ready-mixed concrete has been placed. FIG. In the figure, 14 is a crushed crushed stone, and an outer mold 10 forming an outer vertical surface 13a (see FIG. 23) of a vertical portion 13 of a foundation is erected on the crushed stone 14, and a main reinforcement 15 and a stirrup are provided. The muscle 16 (loose muscle), the slab girder direction muscle 17, and the slab wife direction muscle 18 are arranged. Reference numeral 19 denotes a receiving bar for receiving the stirrup muscle 16.

  And it cut | disconnects the reinforcement which cannot take the concrete covering required for the various reinforcement in the location which forms the inclined hole of foundation concrete, and while ensuring the space which inserts the inclined hole formation tool 1, and as needed Reinforce the cut reinforcement with reinforcing bars. In the space secured in this way, the first shape retainer is so that the lid surface 3a of the first shape retainer 3 is in the vertical direction and is positioned below the second shape retainer 4 in the vertical direction. The permanent magnet 8 provided on the lid surface 3a of the tool 3 is magnetically attached to the inside of the outer formwork 10 for placing ready-mixed concrete and fixed in place. That is, the inclined hole forming tool 1 is fixed to the outer mold 10 so that the outer mold 10 is inclined downward in the vertical direction. The outer mold 10 is made of a material that can be magnetized by the permanent magnet 8.

  Since the pressure and buoyancy of the ready-mixed concrete 20 to be placed act on the permanent magnet 8 according to the principle of leverage, the installation position of the inclined hole forming tool 1 can be accurately determined only by fixing the first shape retaining tool 3 with the permanent magnet 8. It is conceivable that it cannot be secured. Therefore, the sleeve 2 is fixed to a nearby reinforcing bar with a known sleeve holder 9. The configuration of the sleeve holder 9 is not particularly limited, and any configuration can be used as long as it 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 using both the fixing by the permanent magnet 8 and the fixing by the sleeve holder 9, it is possible to sufficiently withstand the pressure and vibration when placing the ready-mixed concrete 20.

  By using the permanent magnet 8 in this manner, the inclined hole forming tool 1 can be easily disposed at a desired position and inclined at a predetermined angle (45 degrees in the illustrated example) with respect to the horizontal line. Once the mounting position of the inclined hole forming tool 1 is determined, it is only necessary to measure the distance to various reinforcing bars and to magnetize the permanent magnet 8 to the outer mold 10 with one touch, and the mounting operation itself is extremely short and Can be done accurately.

  Next, as shown in FIG. 19, the ready-mixed concrete 20 is placed up to the inner horizontal surface 12 (slab surface) where the outer mold 10 and the slab concrete are located, and is cured for a predetermined period to be solidified. After that, as shown in FIG. 20, the second shape holder 4 is formed on the inner surface of the inner mold 11 for placing the ready-mixed concrete installed at the position where the inner vertical surface 13 b (see FIG. 23) of the vertical portion 13 is to be formed. It installs so that the cover surface 4a may contact | abut. At this time, since the inclined hole forming tool 1 is supported and fixed by the ready-mixed concrete up to the first shape retaining tool 3, the sleeve holder 9 and the solidified inner horizontal surface 12, the second shape retaining tool is once again attached to the inner formwork 11. There is no need to fix 4.

  Then, ready-mixed concrete 20 is placed between the outer mold 10 and the inner mold 11 shown in FIG. 20, and the ready-mixed ready-mixed concrete is solidified by curing for a predetermined period. .

  Next, a method for removing the inclined hole forming tool 1 after the ready-mixed concrete 20 is solidified will be described with reference to FIG. First, as shown in FIG. 22 (A), from the state where the ready-mixed concrete is placed and cured between the outer mold 10 and the inner mold 11 shown in FIG. 21, the outer mold 10 and the inner mold are used. The frame 11 is sequentially removed to expose the inclined hole forming tool 1. Next, as shown in FIG. 22B, a hook-shaped metal fitting or other tool is inserted into the operation hole 3f of the first shape retainer 3, and the first shape retainer 3 is detached from the sleeve 2. Remove. Similarly, a hook-shaped metal fitting or other tool is inserted into the operation hole 4e of the second shape retainer 4, and the second shape retainer 4 is detached from the sleeve 2 and removed.

  In the state shown in FIG. 22 (C), the sleeve 2 is urged so as to be reduced in diameter from the inner end portion 2d because the first shape retainer 3 and the second shape retainer 4 that serve as supports do not exist. . Therefore, if the sleeve 2 is pulled in while being wound inward, that is, rotated in the direction of reducing the diameter, as shown in FIG. 22 (D), a straight tubular inclination for inserting the pipe into the concrete foundation of the building The hole 30 can be formed so that the outer direction of the concrete foundation is downward in the vertical direction. The taken-out sleeve 2, the first shape retainer 3, and the second shape retainer 4 can all be reused repeatedly.

  In the above embodiment, the opening 30b positioned above in the vertical direction of the inclined hole 30 is opened in the vertical portion 13 of the concrete foundation, but is opened so as to straddle the inner horizontal plane 12 or the vertical portion 13 and the inner horizontal plane 12. May be. Further, although the solid horizontal foundation 12 has the slab girder direction stripes 17 and the slab wife direction stripes 18 arranged on the inner horizontal plane 12, the moisture-proof concrete placed without placing the inner horizontal plane 12 is used as soil concrete. It can also be.

  The straight tube 21 having a predetermined length is inserted from the opening 30a on the outer vertical surface 13a side or the opening 30b on the inner vertical surface 13b side of the inclined hole 30 formed in this way, and is positioned at the center of the inclined hole 30. The elbow pipes 22 and 23 having predetermined angles (45 degrees in the illustrated example) are inserted and fixed at both ends of the straight pipe 21, and the inclined pipe 31 used as a drain pipe or the like is installed in the straight tubular inclined hole 30. be able to. A straight pipe 24 is connected to the elbow pipe 22 exposed from the outer vertical surface 13a of the vertical portion 13 according to the piping situation, and piped to a drainage basin outside the building. On the other hand, a straight pipe 25 is connected to the elbow pipe 23 exposed from the inner vertical surface 13b of the vertical portion 13 according to the piping condition, and connected to the pipe from the drainage facility in the building. In addition, it is also possible to insert a flexible tube that can be flexibly bent without using the elbow tubes 22 and 23.

  The gap between the inclined hole 30 and the inclined pipe 31 is filled with a filler such as sand and the gap in the opening 30a and the opening 30b is filled with mortar or the like to complete the construction. Thereby, since the clearance gap between the inclination hole 30 and the inclination pipe 31 is obstruct | occluded, there is no problem on ant proof, and even when the necessity of replacement | exchange etc. of the inclination pipe 31 arises, it affects foundation concrete. It can be easily replaced or repaired and inspected without any problems.

  The inclined hole 30 only needs to have a diameter that allows the straight tube 21 constituting the inclined tube 31 to be inserted therethrough, and since it is a straight tube, its volume can be minimized. Thereby, it is possible to minimize the construction difficulties such as the influence of the strength on the concrete structure, the covering of the concrete from the inclined holes 30 to the various reinforcing bars, and the balance with the ground level, and it has high practicality. That is, it is possible to minimize the loss of concrete in the foundation portion.

  According to the inclined hole forming tool and the inclined hole forming method in the concrete foundation according to the present invention, the angle of the inclined hole to be constructed is selected by selecting the inclined angle of the elliptical cover surface obliquely provided on the pair of shape retainers. Can be freely set, and a through hole having a set oblique angle can be formed as a straight tubular inclined hole. In other words, the angle of the inclined hole to be constructed can be freely set by selecting the inclination angle of the lid surface of the first shape retainer and the second shape retainer, and the straight tubular inclined hole that is easily inclined at a predetermined angle. Can be formed. Therefore, through holes such as drain pipes can be formed with a minimum of concrete defects without using a sheath pipe left in the concrete.

  And after installing a pair of shape holders on the outer mold and the inner mold for placing the concrete foundation on the ready-mixed concrete so that the outer mold direction is downward in the vertical direction, the ready-mixed concrete is placed on the outer mold And after removing the outer mold and the inner mold after solidifying the cast ready-mixed concrete, removing the pair of shape retainers, reducing the diameter of the sleeve and removing it, The inclined hole can be formed without leaving the inclined hole forming tool in the inclined hole.

  Since the inclined hole forming tool is installed using the permanent magnet equipped on one of the shape retainers, the work can be performed easily and accurately, and the inclined hole forming tool that has been assembled in advance during the work can be mounted. The attachment work itself can be performed in an extremely short time, and the removal work requires little labor, so the work time and work cost can be greatly reduced. Furthermore, it is possible to repeatedly use all the members of the inclined hole forming tool including the sleeve and the shape retainer.

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

DESCRIPTION OF SYMBOLS 1 ... Inclined hole formation tool 2 ... Sleeve 2a, 2b ... Opening part 2c ... Outer edge part 2d ... Inner edge part 3 ... 1st shape retainer 4 ... 2nd shape retainer 3a, 4a ... Cover surface 3b, 4b ... trunk | drum Part 3c, 4c ... Open end part 3d, 4d ... Insertion edge part 3e ... Opening part 3f, 4e ... Operation hole 5 ... Base sheet 6 ... Ring-shaped yoke 7 ... Disc-shaped back yoke 8 ... Permanent magnet 9 ... Sleeve holder DESCRIPTION OF SYMBOLS 10 ... Outer formwork 11 ... Inner formwork 12 ... Inner horizontal surface 13 ... Vertical part 14 ... Crushed stone 15 ... Main reinforcement 16 ... Stirrup reinforcement 17 ... Slab girder direction reinforcement 18 ... Slab wife direction reinforcement 19 ... Receiving reinforcement 20 ... Ready-mixed concrete 21 , 24, 25 ... straight pipe 22, 23 ... elbow pipe 30 ... inclined hole 31 ... inclined pipe

Claims (11)

  It consists of a sleeve formed by winding a base sheet into a hollow cylinder so that the diameter can be increased and reduced, and a pair of shape holders that are covered cylinders with an elliptical lid surface obliquely provided at one end. An inclined hole forming tool in a concrete foundation, wherein a pair of shape-retaining tools are attached to both end openings of a sleeve so that the lid surfaces are parallel to each other.   A sleeve formed by winding a base sheet into a hollow cylinder so that the diameter of the base sheet can be expanded and reduced, and a covered cylinder, with an elliptical lid surface obliquely provided at one end and an insertion edge protruding from the other end A pair of shape retainers, and the insertion edges of the pair of shape retainers are inserted into the opening portions at both ends of the sleeve so that the lid surfaces are parallel to each other, and the pair of shape retainers is inserted into the sleeve. An inclined hole forming tool in a concrete foundation characterized by being tightened by means of   The inclined hole forming tool in a concrete foundation according to claim 2, wherein a trunk section having a circular cross section is continuously provided on the lid surface of the shape retainer, and an insertion edge is projected from the open end of the trunk section.   The inclined hole forming tool in a concrete foundation according to claim 1, 2 or 3, wherein the lid surfaces of the pair of shape retainers are inclined by 40 to 50 degrees in the sleeve direction.   The inclined hole forming tool in a concrete foundation according to claim 1, 2, 3 or 4, wherein the winding state of the sleeve is held by a pair of shape retaining tools.   6. A permanent magnet is provided on at least one of the pair of shape retainers, and the inclined hole forming tool can be magnetically attached to the mold for placing concrete using the permanent magnet. Inclined hole forming tool for concrete foundations.   The inclined hole forming tool in a concrete foundation according to claim 1, 2, 3, 4, 5, or 6, wherein the diameter of the sleeve is reduced by removing the pair of shape retainers.   The concrete foundation according to claim 1, 2, 3, 4, 5, 6 or 7, wherein a synthetic resin such as polyamide, PBT, AES / ABS resin, nylon or polypropylene is used as a material of the sleeve and / or shape retainer. Inclined hole forming tool.   A pair of shape retainers of the inclined hole forming tool in the concrete foundation according to any one of claims 1 to 8, the outer mold direction and the inner mold form for placing concrete in the ready-mixed concrete foundation in the outer mold direction Is placed in the vertical direction so that the ready-mixed concrete is placed between the outer formwork and the inner formwork, and after the placed ready-mixed concrete is solidified, the outer formwork, the inner formwork and the inclined hole forming tool are placed. A method for forming an inclined hole in a concrete foundation, comprising forming a straight tubular inclined hole for inserting a pipe into a concrete foundation of a building by sequentially removing the pipe.   An outer formwork for placing ready-mixed concrete in one of the inclined hole forming tools in the concrete foundation according to any one of claims 1 to 8, wherein the shape retaining tool is located at a position where an outer vertical surface of the concrete foundation is to be formed. Next, after setting the outer mold direction to be downward in the vertical direction, the ready-mixed concrete is placed and solidified to the inner horizontal plane, and then the ready-mixed concrete is placed at the place where the inner vertical surface is to be formed. After installing the inner formwork and placing ready-mixed concrete between the outer formwork and the inner formwork and solidifying it, the outer formwork, the inner formwork, and the inclined hole forming tool are sequentially removed, and the concrete of the building An inclined hole forming method in a concrete foundation, wherein a straight tubular inclined hole for inserting a pipe into the foundation is formed.   The concrete foundation according to claim 9 or 10, wherein when the inclined hole forming tool is removed, the sleeve is reduced in diameter by removing the pair of shape retainers after removing the outer mold and the inner mold. Inclined hole forming method.

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