JP2013142247A - Sleeve for concrete through-hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve for a concrete through-hole which is excellent in workability, and which is satisfactory in the finishing of a concrete structure for preventing concrete from invading into a sleeve.SOLUTION: A sleeve 10 is constituted of a sleeve body 12 consisting of an inner cylinder 14 and an outer cylinder 22 which are overlapped with each other so that they can expand in an axial direction and fixation retainers 40A, 40B having flange-shaped protrusions 44 which are engaged with grooves 18 and 28 inside both ends of the sleeve body 12. A part of an O ring 50 adhered to the inner peripheral surface of the sleeve body is stored in a groove 48 disposed on the cylindrical part outer peripheral surfaces of the fixation retainers 40A and 40B. A nail 58 is driven into a rib 54 inside the fixation retainers 40A, 40B, and the fixation retainers 40A and 40B are attached on mold inner surfaces 60A and 60B, and the shortened sleeve body 12 is inserted into a space between reinforcing iron bars 62, and concrete 64 is placed in the mold 60, and concrete is poured. The mold 60 is removed after curing, and the fixation retainers 40A, 40B are removed from the sleeve body 12.

Description

  The present invention relates to a sleeve for forming a through-hole through which various pipes and wirings are inserted in a concrete structure such as a wall or a beam, and more specifically, improvement of the workability of the sleeve and the finish of the concrete structure. , It relates to prevention of concrete intrusion into the sleeve.

  In a reinforced concrete building, through holes for passing various pipes and wiring (cables) are formed in parts such as walls and beams. Such a through hole is usually formed by attaching a sleeve (sheath tube) between the inner surfaces of a mold having a predetermined width or length, and then placing concrete. Since the length of the through hole is not necessarily constant, an expandable and contractible sleeve has been proposed for the purpose of accommodating the length of the through hole by making the length of the sleeve adjustable. There has also been proposed a technique aimed at efficiently performing a sleeve installation operation by attaching a holder for fixing the sleeve to the inner surface of the mold in advance.

  For example, Patent Document 1 below includes an outer sleeve and an inner sleeve that can be inserted into the outer sleeve, and includes a locking unit that prevents the outer sleeve and the inner sleeve from being detached when extended. A slide sleeve for building work is disclosed. Further, in Patent Document 2 below, a plurality of projecting pieces provided with nail holes on the outer periphery of a receiving body main body formed with an arc-shaped rising piece that is open on the sleeve, and the inner periphery is hooked on the sleeve. There is disclosed a sleeve receiver for facility construction, which is provided with anchor pieces for preventing coming off.

JP-A-9-105226 JP-A-9-291700

  However, in the technique described in Patent Document 1, first, a flange provided at one end portion of the inner sleeve or the outer sleeve is placed while a shortened sleeve is disposed between a pair of opposing molds and supported in that state. A nail or the like is driven in and fixed to the mold, and then the sleeve is extended, and then the other sleeve is fixed to the mold by the same method. That is, in a narrow space where reinforcing bars are arranged in the mold, it is fixed to the mold while supporting the sleeve, so that there is an inconvenience that improvement in work efficiency cannot be expected. Also, after placing the concrete and removing the formwork, the nail remains in a state of protruding from the concrete, so a nail removal (or cutting) work is necessary, and a part of the concrete is lost due to such work. Inconvenience may occur.

  On the other hand, in the technique described in Patent Document 2, workability is good because the receiver is attached to the formwork in advance, but when the concrete is cured, a part of the receiver is exposed in the concrete. It has become. For this reason, after removing a receiver from a concrete surface simultaneously with a formwork, there exists a problem that the recessed part of the same shape as the said receiver remains in a concrete structure. Moreover, since the said receiving tool takes the effort which attaches a protrusion piece to an outer peripheral part by appropriate means, such as welding, there also exists a problem that a manufacturing process and cost increase. Furthermore, it is easy to move because it is pressed at several locations on the outer periphery with respect to the mold, and there is a risk that the concrete may enter inside.

  The present invention focuses on the above points, and provides a concrete through-hole sleeve that is excellent in workability, has a good concrete structure finish, and is suitable for preventing concrete from entering the sleeve. That is the purpose.

  The present invention is a sleeve for forming a through-hole in a concrete structure, and is composed of one or more inner cylinders and outer cylinders that overlap each other in an axial direction, and these inner cylinders and outer cylinders are axially connected. Both ends when stretched are in contact with the inner surface of the formwork for the concrete structure, and are detachably connected to the inner sides of the both ends of the sleeve body using an uneven shape, and one end side is the inner surface of the formwork A pair of fixing holders, and a pair of fixing holders that are provided on the inner side of the cylinder parts and that engage with the fixing parts that are fixed to the mold frame. An airtight mechanism is provided that maintains an airtightness between the outer peripheral surface and the inner peripheral surfaces of both end portions of the sleeve main body.

  One of the main forms is a substantially ring-shaped recess formed in the circumferential direction on the inner peripheral surface of both end portions of the sleeve main body, and the outer peripheral surface of the cylindrical portion of the fixing holder, At both ends of the sleeve main body, a flange-shaped convex portion formed almost over the entire circumference on the opposite end to the abutting side, and at least one slit formed in the radial direction on the convex portion. The inside of the part and the pair of fixing holders are detachably connected.

  In another form, the airtight mechanism is an outer peripheral surface of the cylindrical portion of the fixing holder, and is formed in a substantially ring shape formed between the end portion on the mold contact side and the flange-shaped convex portion. It includes a groove, and an airtight body that is partly accommodated in the groove and has elasticity that is in close contact with inner peripheral surfaces of both end portions of the sleeve body.

  Still another embodiment is characterized in that a magnet is provided in one of the substantially ring-shaped concave portion of the inner peripheral surface of the sleeve body or the flange-shaped convex portion of the fixing holder, and the other is formed of a metal material. . Still another embodiment is characterized in that a large number of protrusions are provided on the mold contact surface of the cylindrical portion of the fixed holder.

  Yet another embodiment is characterized in that the sleeve main body can be expanded and contracted in the axial direction by fitting the respective end portions of the inner cylinder and the outer cylinder in a slidable manner. Or the length of the part which an inner cylinder and an outer cylinder overlap by screwing with the screw part formed in the inner peripheral side of the one end of the said outer cylinder, and the screw part formed in the outer peripheral side of the one end of the said inner cylinder The sleeve main body can be expanded and contracted in the axial direction. Still another embodiment is characterized in that a gear meshing with a gear on the outer peripheral edge of the rotation assisting tool is formed on the outer peripheral surface of the outer cylinder or the inner cylinder.

  Still another embodiment is characterized in that a locking means for preventing the end portions of the inner cylinder and the outer cylinder from detaching at the time of extension is provided in the overlapping portion of the inner cylinder and the outer cylinder. Still another embodiment is characterized in that position fixing means for fixing the overlapping position of the inner cylinder and the outer cylinder is provided. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the present invention, a pair of fixed holdings in which one end portion can be in contact with the inner surface of the mold frame inside both ends of a sleeve main body composed of one or more inner cylinders and outer cylinders that overlap each other in an axially stretchable manner. The tool is detachably connected by fitting the concave and convex shapes. Then, an elastic airtight body that is partially accommodated in a groove provided on the outer peripheral surface of the fixing holder is brought into close contact with the inner surfaces of both ends of the sleeve body. For this reason, it is easy to attach to and remove from the formwork to improve workability and to obtain a concrete structure with a good finish. Further, the airtight body can prevent the concrete from entering the sleeve. Furthermore, the effect that the fixed fixture removed can be reused after concrete curing is obtained.

(A) is sectional drawing which shows the mode at the time of construction of Example 1 of this invention, (B) and (C) are figures which show a modification. It is an external appearance perspective view which shows the structure of the fixing holder of the said Example 1, and an outer cylinder edge part. It is sectional drawing which shows the airtight structure of the fixing holder of the said Example 1, and a sleeve main body. It is a figure which shows an example of the construction procedure of the said Example 1. FIG. It is principal sectional drawing which shows the structure of Example 2 of this invention. It is an external appearance perspective view which shows the structure of the fixing holder of the said Example 2, and an outer cylinder edge part. It is a figure which shows an example of the construction procedure of the said Example 2. FIG.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 (A) is a cross-sectional view showing a state during construction of Example 1 of the present invention, and (B) and (C) are views showing modifications. FIG. 2 is an external perspective view showing the structure of the fixing holder and the outer cylinder end portion of the present embodiment. FIG. 3 is a cross-sectional view showing an airtight structure between the fixing holder and the sleeve main body of this embodiment, and FIG. 4 is a diagram showing an example of a construction procedure of the sleeve of this embodiment.

  The sleeve of the present invention is used to form through holes through which pipes such as water and gas and various cables are passed through a reinforced concrete building or the like. There are various known sleeves such as iron pipes (steel pipes) and resin pipes that are to be buried after curing the concrete, and paper void pipes that are removed from the concrete while being broken after curing. The description will be made assuming that it is made of resin so that fitting by shape is easy. As shown in FIG. 1, the sleeve 10 is substantially cylindrical and has a sleeve main body 12 including an inner cylinder 14 and an outer cylinder 22 that are fitted so as to be expandable and contractable in the axial direction, and a pair of fixed portions provided on the inner sides of both ends. It is comprised by the holders 40A and 40B.

  The inner cylinder 14 constituting the sleeve main body 12 has a substantially cylindrical shape, and a flange portion 16 is formed on one end portion 14A toward the outside. The flange portion 16 comes into contact with the inner surface 60A of the mold when the inner cylinder 14 is held in the mold 60 using the fixed holder 40A. A substantially ring-shaped recess 18 is formed at an appropriate position on the inner peripheral surface of the inner cylinder 14 on the end portion 14A side. An expansion / contraction adjustment tool 20 for adjusting the degree of overlap with the outer cylinder 22 is slidably provided on the outer peripheral surface of the inner cylinder 14 on the other end 14B side. A screw portion 20 </ b> A is formed on a part of the outer peripheral surface of the expansion / contraction adjuster 20. In addition, a position fixing screw 20B that can be advanced and retracted in a direction orthogonal to the longitudinal direction of the inner cylinder 14 is provided at an appropriate position of the expansion / contraction adjuster 20. The inner cylinder 14 and the expansion / contraction adjustment tool 20 are fixed by bringing the tip of the position fixing screw 20B into contact with the outer peripheral surface of the inner cylinder 14, and the inner cylinder 14 and the expansion / contraction adjustment tool 20 are loosened by loosening the position fixing screw 20B. Are slidable with respect to each other.

  On the other hand, the outer cylinder 22 has a substantially cylindrical shape, and a flange portion 24 protruding outward is formed on one end portion 22A side. The flange portion 24 comes into contact with the inner surface 60B of the mold when the outer cylinder 22 is held in the mold 60 by using the fixing holder 40B. A thick portion 26 is formed on the inner peripheral surface on the end 22A side. A substantially ring-shaped recess 28 is formed at an appropriate position of the thick portion 26. On the other end 22 </ b> B side of the outer cylinder 22, a receiving tool 30 that receives the expansion / contraction adjusting tool 20 is provided. The receiver 30 includes a fixing portion 32 fixed to the outer peripheral surface of the outer cylinder 22 and a rotating portion 34 that can rotate with respect to the fixing portion 32. A screw portion 36 is formed on the inner peripheral surface of the rotating portion 34 and is screwed with the screw portion 20 </ b> A of the expansion / contraction adjuster 20. The position of the inner cylinder 14 with respect to the outer cylinder 22 is adjusted by rotating the rotating part 34 in a state where the screw part 20A and the screw part 36 are engaged (that is, the overlapping state of the inner cylinder 14 and the outer cylinder 22 is adjusted). The overall length of the sleeve body 12 can be adjusted.

  Next, the fixed holders 40A and 40B will be described. In addition, since the fixed holders 40A and 40B have the same configuration, the fixed holder 40B will be described below as an example. As shown in FIG. 2, the fixing holder 40 </ b> B is detachably fitted to the inner side of the end portion of the outer cylinder 22 on the flange portion 24 side. In the fixed holder 40B, one end portion 42A of the substantially cylindrical tube portion 42 can be brought into contact with the inner surface 60B of the formwork, and the other end portion is fitted with the concave portion 28 on the inner peripheral surface of the outer tube 22. A flange-like convex portion 44 is formed. The convex portion 44 is provided with a plurality of slits 46 in the radial direction so that it can be easily fitted into the concave portion 28. Further, a rib 54 that bisects the inside of the cylinder part 42 is provided on the inside of the cylinder part 42. The rib 54 is provided with a plurality of through holes 56 (three places in the illustrated example) through the nail 58 for fixing to the inner surface 60B of the formwork at appropriate intervals.

  A substantially ring-shaped groove 48 is formed on the outer peripheral surface of the cylindrical portion 42. The groove 48 accommodates a part of the O-ring 50 having elasticity. The O-ring 50 is crushed and deformed when the outer cylinder 22 and the fixing holder 40 </ b> B are connected, and is in close contact with the inner peripheral surface of the outer cylinder 22. Since the inner diameter D2 (see FIG. 3) of the outer cylinder 22 is larger than the inner diameter D1 of the inner cylinder 14, the fixing holder 40A is originally prepared to have a size that matches the inner diameter D1 of the inner cylinder 14. However, it is necessary to prepare the fixed holder 40B according to the inner diameter D2 of the outer cylinder 22. However, in the present embodiment, the thick portion 26 is formed on the inner peripheral surface of the outer cylinder end portion 22A, and the inner diameter of the thick portion 26 is approximately the same as the inner diameter D1 of the inner tube 14, It is possible to use the fixed holders 40A and 40B having the same dimensions. At this time, depending on the thickness of the thick portion 26 and the depth of the concave portion 28, a gap 52 (see FIG. 3) may be generated in the fitting portion, but the O-ring 50 is deformed and the cylindrical portion 42 and the flange portion are formed. Since it adheres to the inside of 24 and keeps airtightness, the penetration | invasion of the concrete during construction can be prevented. The same applies to the airtight structure between the other fixing holder 40A and the inner cylinder 14.

  As a material constituting the inner cylinder 14 and the outer cylinder 22, for example, a zinc iron plate may be used in addition to the resin described above. Further, as a material constituting the fixing holders 40A and 40B, for example, a hard vinyl chloride pipe such as VP (PVC thick wall pipe) or VU (PVC thin wall pipe) is used, but it withstands the strength of concrete. Any other known material can be used as long as it can be used. In addition, what is necessary is just to select a material suitably according to an installation place. The dimensions (diameter and length) of the inner cylinder 14, the outer cylinder 22, and the fixing holders 40A and 40B can be appropriately changed according to the dimension of the through hole to be formed.

  Next, the operation of this embodiment will be described with reference to FIG. First, as shown in FIG. 4 (A), nails 58 are driven into the through holes 56 of the ribs 54 of the fixing holders 40A and 40B at predetermined positions on the pair of inner surfaces 60A and 60B opposed to the mold 60, The fixing holders 40A and 40B are attached. Next, as shown in FIG. 4 (B), the inner cylinder 14 and the outer cylinder 22 are slid toward the center and the sleeve main body 12 is shortened so that it is inserted between the reinforcing bars 62, and then the mold 60 Insert to a predetermined position. Then, at a predetermined position, the inner cylinder 14 and the outer cylinder 22 are slid to extend the sleeve body 12. When the sleeve body 12 is extended, the inner cylinder 14 is pulled out from the outer cylinder 22 in a state where the position fixing screw 20B is loosened, and fine adjustment is performed by the screw portion 20A of the telescopic adjustment tool 20 and the screw portion of the receiving tool 30. This is done by 36 screws. Then, when the concave portion 18 inside the end portion of the inner cylinder 14 is fitted into the convex portion 44 of the fixed holder 40 </ b> A, the O-ring 50 comes into close contact with the inner peripheral surface of the inner cylinder 14.

  Next, when the convex portion 44 of the fixing holder 40 </ b> B is fitted into the concave portion 28 inside the end portion of the outer cylinder 22 in the same procedure, the O-ring 50 comes into close contact with the inner peripheral surface of the outer cylinder 22. Note that either the inner cylinder 14 or the outer cylinder 22 may be fixed first. As shown in FIG. 4C, when both the inner cylinder 14 and the outer cylinder 22 are attached to the fixing holders 40 </ b> A and 40 </ b> B, the position fixing screw 20 </ b> B is tightened and the inner cylinder 14 does not move with respect to the outer cylinder 22. To fix. When the sleeve 10 is mounted in the mold 60 as described above, concrete 64 is placed in the mold 60 as shown in FIG. After curing the concrete 64, the mold 60 is removed as shown in FIG. Finally, as shown in FIG. 4 (F), the fixing holders 40A and 40B are removed. The removed fixed holders 40A and 40B can be reused as necessary.

Thus, according to the first embodiment, there are the following effects.
(1) A pair of fixed holdings that are fixed to the inside of both ends of the sleeve body 12 composed of the inner cylinder 14 and the outer cylinder 22 that are stretchably overlapped in the axial direction so that one end abuts against the mold inner surfaces 60A and 60B. The tools 40A and 40B are detachably connected by fitting in a concavo-convex shape. In addition, the O-ring 50 that is partially accommodated in the groove 48 provided in the cylindrical portion 42 of the fixing holders 40A and 40B is brought into close contact with the inner peripheral surface of the end portion of the sleeve main body 12. For this reason, the fixing holders 40A and 40B can be attached in advance to the inner surfaces 60A and 60B of the mold, and can be easily attached without nailing after the sleeve body 12 is placed in the mold 60. Can do. In addition, the fixing holders 40A and 40B can be easily removed from the concrete 64 after curing, and there is no decrease in work efficiency associated with the removal of the nail 58 or loss of concrete. For this reason, while improving workability, the concrete structure of favorable finish is obtained. Furthermore, since the airtightness is maintained by the O-ring 50, the concrete 64 does not enter through the gap, and it does not take time to remove the concrete that has entered after curing and demolding.

(2) Since the thick portion 26 is formed on the inner peripheral surface of the end portion of the outer cylinder 22 and the inner diameter of the thick portion 26 is set to be substantially the same as the inner diameter of the inner cylinder 14, the fixing holders 40A and 40B The same dimensions can be used. For this reason, it is not necessary to use the fixing holders 40A and 40B separately at the time of construction, and the working efficiency is improved.
(3) Since the fixed holders 40A and 40B are housed in the inner cylinder 14 and the outer cylinder 22 and are not exposed in the concrete 64, the shapes of the fixed holders 40A and 40B are transferred to the concrete structure after curing. There is nothing to do. Therefore, it is not necessary to separately finish the cured concrete, and the surface removed from the mold 60 can be used as a finished surface as it is. For this reason, no waste is generated, the number of processes is reduced, and manufacturing efficiency can be improved and costs can be reduced.

(4) Since the removed fixed holders 40A and 40B can be reused after curing the concrete, effective use of resources is effective in reducing costs.
(5) The expansion / contraction adjustment tool 20 is provided on the inner cylinder 14 side, and the receiving tool 30 is provided on the outer cylinder 22 side, and the inner cylinder 14 and the outer cylinder 22 are overlapped by screwing these screw portions 20A and 36. Since adjustment is possible, the length of the sleeve body 12 can be easily adjusted.
(6) By loosening the position fixing screw 20B penetrating the expansion / contraction adjustment tool 20, the pulling condition of the inner cylinder 14 can be easily adjusted. Further, the position of the inner cylinder 14 can be fixed by tightening the position fixing screw 20B.

  Next, Embodiment 2 of the present invention will be described with reference to FIGS. In addition, the same code | symbol shall be used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds (it is the same also about a following example). FIG. 5 is a main cross-sectional view showing the structure of this embodiment. FIG. 6 is an external perspective view showing the structure of the fixing holder and the outer cylinder end portion of the present embodiment. FIG. 7 is a diagram illustrating an example of a construction procedure according to the present embodiment. Basically, the sleeve 100 of the present embodiment also has a pair of fixed holdings provided at both ends thereof, as in the first embodiment, the sleeve main body 12 including the inner cylinder 14 and the outer cylinder 22 that are fitted in an extendable manner. It is comprised by tools 40A 'and 40B'.

  The inner cylinder 14 and the outer cylinder 22 of the present embodiment have the same structure as that of the above embodiment, but are formed of a metal material. In addition, gears 38 are provided at predetermined intervals on the outer peripheral surface of the rotating portion 34 of the receiving tool 30 </ b> A provided on the outer cylinder 22. The gear 38 meshes with a gear 82 provided on the outer peripheral edge of a known rotation assisting tool 80 (for example, a turning bar). By using the rotation assisting tool 80 and meshing with the gear 38 to rotate the rotating portion 34, the overlapping degree of the inner cylinder 14 and the outer cylinder 22 can be adjusted.

  Next, the fixed holders 40A ′ and 40B ′ will be described. Note that the fixed holders 40A ′ and 40B ′ have the same configuration, and therefore, the fixed holder 40B ′ will be described below as an example. As shown in FIG. 6, the fixing holder 40 </ b> B ′ is detachably fitted inside the end portion of the outer cylinder 22 on the flange portion 24 side. The fixed holder 40B ′ has one end 42A of the substantially cylindrical tube portion 42 that can abut against the inner surface 60B of the mold, and the other end is fitted with the recess 28 on the inner peripheral surface of the outer tube 22. A flange-like convex portion 44 is formed. A large number of spikes 43 (fine spine-shaped protrusions) are provided on the end 42A that contacts the inner surface of the mold. A magnet 45 is embedded in the outer peripheral edge of the convex portion 44. The ribs 54 and the through holes 56 on the inner side of the cylindrical portion 42, the grooves 48 and the O-ring 50 on the outer peripheral surface of the cylindrical portion 42 are the same as in the first embodiment. As a material constituting the inner cylinder 14 and the outer cylinder 22, for example, metal is used.

  Next, the operation of this embodiment will be described with reference to FIG. First, as shown in FIG. 7A, nails 58 are driven into the through holes 56 of the ribs 54 of the fixed holder 40A ′ at predetermined positions on one inner surface 60A of the mold 60, and the fixed holder 40A. Install ´. The spike 43 at the tip of the cylinder portion of the fixing holder 40A ′ bites into the mold inner surface 60A. Next, as shown in FIG. 7 (B), the other fixing holder 40B 'is attached to the end of the outer cylinder 22 in advance, and the sleeve main body 12 is passed through the rebar 62 while being short, and the formwork is formed. Insert up to 60 predetermined positions. And as shown in FIG.7 (C), the edge part of the inner cylinder 14 is connected with the said fixed holder 40A '. At this time, in addition to the connection by fitting the concave portion 18 on the inner cylinder 14 side and the convex portion 44 of the fixing holder 40A ′, the magnet 45 provided on the fixing holder 40A ′ is attracted to the metallic inner cylinder 14. It is possible to know that the connection has been made with confidence.

  Next, the sleeve body 12 is extended by sliding the inner cylinder 14 and the outer cylinder 22. The method of extending the sleeve body 12 is the same as that in the first embodiment. When the flange 24 at the end of the outer cylinder 22 comes into contact with the inner surface 60B of the mold 60, finally, using the rotation auxiliary tool 80, the receiving tool 30A is rotated to move the outer cylinder 22 toward the mold inner surface 60B. Stretch. Then, since the spike 43 at the tip of the fixed holder 40B ′ bites into the mold inner surface 60B, the sleeve body 12 can be installed in the mold 60 without attaching the fixed holder 40B ′ to the mold 60 in advance. After that, as shown in FIG. 7D, concrete 64 is placed in the mold 60. After the concrete 64 is cured, the mold 60 is removed as shown in FIG. Finally, as shown in FIG. 7 (F), the fixing holders 40A and 40B are removed. The removed fixed holders 40A and 40B can be reused as necessary.

  As described above, according to the second embodiment, the magnet 45 is provided on the outer peripheral edge of the convex portion 44 of the fixing holders 40A ′ and 40B ′, and the inner cylinder 14 and the outer cylinder 22 formed of a metal material are fitted with unevenness. At the same time, the magnet 45 is attracted. For this reason, it can know by the response that it fitted. Further, a spike 43 is provided at the end of the cylindrical portion 42 of the fixing holders 40A ′ and 40B ′, and the sleeve 43 is fixed in the mold frame 60 by biting the spike 43 into the mold inner surfaces 60A and 60B. It was decided. For this reason, construction can be facilitated by fixing either one of the fixing holders 40A ′ or 40B ′ in advance to the inner surface of the formwork and attaching the other to the end of the sleeve main body 12. Furthermore, a gear 38 that meshes with the gear 82 of the rotation assisting tool 80 is provided on the outer peripheral surface of the rotating portion 34 of the receiving tool 30A of the outer cylinder 22, and the outer cylinder 22 is extended by using the rotation assisting tool 80. The spike 43 can be easily cut into the mold inner surface 60B. Other basic functions and effects are the same as those of the first embodiment.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes and dimensions shown in the above-described embodiments are examples, and can be appropriately changed according to the shape and dimensions of the through-holes to be formed.
(2) The material shown in the above embodiment is also an example, and may be appropriately changed depending on the application and installation location as long as the same effect is obtained. For example, in consideration of cost, an inexpensive galvanized iron plate is used, or when it is inconvenient to rust like an underground beam, a resin pipe is used. In the case where the fixing holders 40A and 40B are made of resin, manufacturing is facilitated by forming them with a mold including the ribs 54.
(3) The flange portions 16 and 24 shown in the first embodiment are also an example, and the end portion 14A of the inner cylinder 14 and the end portion 22A of the outer cylinder 22 may not be provided with a flange.

(4) The adjustment of expansion / contraction by the expansion / contraction adjustment tool 20 and the receiving tool 30 shown in the first embodiment is also an example, and the design may be changed as appropriate so as to achieve the same effect. For example, in the above-described embodiment, the inner cylinder 14 and the outer cylinder 22 are screwed together via the expansion / contraction adjustment tool 20 and the receiving tool 30, but a screw portion is formed on the outer peripheral surface of the inner cylinder 14, and the outer cylinder 22. It is good also as a structure which forms a thread part in the inner peripheral surface of these, and these threaded parts are screwed directly. In addition, for example, as shown in FIG. 1B, the end portion 14B of the inner cylinder 14 and the end portion 22B of the outer cylinder 22 are simply overlapped, and the position is fixed so as to penetrate the outer cylinder 22 in a substantially orthogonal direction. You may make it fix the position of the inner cylinder 14 with respect to the outer cylinder 22 in arbitrary places by making the front-end | tip of the screw 70 contact | abut to the outer peripheral surface of the inner cylinder 14. FIG.
(5) In the above embodiment, by forming the thick portion 26 on the inner peripheral surface of the end portion of the outer cylinder 22, it is possible to use the fixed holders 40A and 40B having the same dimensions. It is an example and does not preclude the use of the fixed holders 40A and 40B having different dimensions. Further, even if the reduced diameter portion is formed at the end portion of the outer cylinder 22 without forming the thick portion 26, the fixed holders 40A and 40B having the same dimensions can be used. Furthermore, the thickness of the O-ring may be changed to correspond to the difference in the inner diameter without forming the thick portion 26 or the reduced diameter portion.

(6) As shown in the example shown in FIG. 1 (C), a flange-like locking portion 72 protruding outward is provided on the end 14B side of the inner cylinder 14, and on the outer cylinder end 22B side. You may make it provide the flange-shaped latching | locking part 74 which protruded toward the inner side. The engagement of the locking portions 72 and 74 can prevent the end portions 14B and 22B from being detached. Moreover, you may add such a latching mechanism to the expansion-contraction mechanism shown in the said Example 1 or FIG. 1 (B).
(7) In the second embodiment, the inner cylinder 14 and the outer cylinder 22 are made of metal, and the magnets 45 are provided on the convex portions 44 of the fixing holders 40A ′ and 40B ′. This is also an example, The magnet 45 may be provided as necessary. Moreover, a magnet is provided in the inner peripheral side of the inner cylinder 14 or the outer cylinder 22, and it does not prevent the convex parts of the fixing holders 40A and 40B from being made of metal.
(8) The spikes 43 provided at the ends of the fixing holders 40A ′ and 40B ′ shown in the second embodiment are also an example, and may be provided as necessary. Further, the configuration using the spike 43 and the magnet 45 may be combined with the configuration shown in FIG. 1 (B) or FIG. 1 (C).

(9) In the second embodiment, the gear 38 that meshes with the gear 82 of the rotation assisting tool 80 is provided on the outer peripheral surface of the receiving tool 30A of the outer cylinder 22. However, this is also an example, and the same effect is achieved. The design may be changed as appropriate. For example, in the case of a configuration in which a screw part is formed on the outer peripheral surface of the inner cylinder 14 as described above, a screw part is formed on the inner peripheral surface of the outer cylinder 22, and these screw parts are directly screwed together, The gear 38 may be provided on either the outer peripheral surface of the cylinder 14 or the outer cylinder 22.
(10) In the first embodiment, the sleeve main body 12 is configured by one inner cylinder 14 and one outer cylinder 22, but this is also an example, and the number of inner cylinders and outer cylinders is appropriately determined as necessary. The inner cylinder may be positioned at both ends of the sleeve body, or the outer cylinder may be disposed at both ends.
(11) The through-hole formed by using the sleeve of the present invention is a suitable application example, such as a beam or a wall, but is not limited to this, and other known various concrete structures in general The present invention is applicable.

  According to the present invention, a pair of fixed holdings in which one end portion can be in contact with the inner surface of the mold frame inside both ends of a sleeve main body composed of one or more inner cylinders and outer cylinders that overlap each other in an axially stretchable manner. The tool is detachably connected by fitting the concave and convex shapes. And, an airtight body having elasticity which is partly accommodated in a groove provided on the outer peripheral surface of the fixing holder is brought into close contact with the inner surfaces of both ends of the sleeve body to prevent the concrete from entering the sleeve. did. For this reason, it is suitable for the use of the sleeve for forming a through-hole in a concrete structure. In particular, it is suitable for forming a through-hole that is required to prevent intrusion of concrete.

10: Sleeve 12: Sleeve body 14: Inner cylinders 14A, 14B, 22A, 22B: End portions 16, 24: Flange portions 18, 28: Recess 20: Expansion / contraction adjuster 20A: Screw portion 20B: Position fixing screw 22: Outer tube 26: Thick part 30, 30A: Receiving tool 32: Fixing part 34: Rotating part 36: Screw part 38: Gears 40A, 40A ', 40B, 40B': Fixed holding tool 42: Tube parts 42A, 42B: End part 43 : Spike 44: Projection 45: Magnet 46: Slit 48: Groove 50: O-ring 52: Clearance 54: Rib 56: Through hole 58: Nail 60: Formwork 60A, 60B: Inner surface 62: Reinforcement 64: Concrete 70: Position Fixing screw 72, 74: Locking part 80: Rotation auxiliary tool 82: Gear 100: Sleeve

Claims (10)

A sleeve for forming a through hole in a concrete structure,
It consists of one or more inner cylinders and outer cylinders that overlap each other in a stretchable manner in the axial direction, and both ends when the inner and outer cylinders are extended in the axial direction contact the inner surface of the mold for concrete structure. The sleeve body in contact,
The sleeve body is detachably connected to the inside of both end portions of the sleeve body using a concavo-convex shape, and one end side is provided on the inner side of the mold frame, and is fixed to the mold frame. A pair of fixing holders having a fixing tool to be engaged and an engaging portion to be engaged;
An airtight mechanism for maintaining an airtightness between the outer peripheral surfaces of the pair of fixing holders and the inner peripheral surfaces of both end portions of the sleeve body;
A concrete through-hole sleeve characterized by comprising: A substantially ring-shaped recess formed in the circumferential direction on the inner peripheral surface of both ends of the sleeve body;
A flange-like convex portion formed on the outer peripheral surface of the cylindrical portion of the fixing holder, on the end opposite to the mold contact side, over substantially the entire circumference;
At least one or more slits formed in the radial direction on the convex portion; and
The concrete through-hole sleeve according to claim 1, wherein the inside of both ends of the sleeve main body and the pair of fixing holders are detachably connected to each other. The airtight mechanism is
A substantially ring-shaped groove formed on the outer peripheral surface of the cylindrical portion of the fixing holder between the end on the mold contact side and the flange-shaped convex portion;
An airtight body having elasticity that is partly accommodated in the groove and in close contact with the inner peripheral surfaces of both ends of the sleeve body;
The concrete through-hole sleeve according to claim 2, comprising:   The magnet is provided in any one of the substantially ring-shaped recessed part of the internal peripheral surface of the said sleeve main body, or the flange-shaped convex part of the said fixed holder, The other was formed with the metal material. Sleeve for concrete through hole.   5. The concrete through-hole sleeve according to claim 1, wherein a number of protrusions are provided on a formwork contact surface of the cylindrical portion of the fixing holder.   The end portions of the inner cylinder and the outer cylinder are slidably fitted to each other so that the sleeve body can be expanded and contracted in the axial direction. The concrete through-hole sleeve as described.   The length of the overlapping portion of the inner cylinder and the outer cylinder is adjusted by screwing the screw part formed on the inner peripheral side of the one end of the outer cylinder and the screw part formed on the outer peripheral side of the one end of the inner cylinder. The sleeve for a concrete through hole according to any one of claims 1 to 5, wherein the sleeve body is extendable and contractible in an axial direction.   8. The concrete through-hole sleeve according to claim 7, wherein a gear meshing with a gear on an outer peripheral edge of the rotation assisting tool is formed on an outer peripheral surface of the outer cylinder or the inner cylinder.   The concrete penetration according to any one of claims 1 to 8, wherein a locking means for preventing the end portions of the inner cylinder and the outer cylinder from separating from each other at the time of extension is provided at an overlapping portion of the inner cylinder and the outer cylinder. Hole sleeve.   The concrete through-hole sleeve according to any one of claims 1 to 9, further comprising position fixing means for fixing an overlapping position of the inner cylinder and the outer cylinder.

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