JP2018135664A - Sleeve pipe and manufacturing method thereof, and manufacturing method of through hole using sleeve pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve pipe capable of simplifying a manufacturing work and a removing work by using only a single sleeve pipe body having a slit, and to provide a manufacturing method of the sleeve pipe and a manufacturing method of a through hole using the sleeve pipe.SOLUTION: A sleeve pipe 1 having a sleeve pipe body 10 made of a synthetic resin and used for forming a through hole in a concrete wall to be cast and placed. A slit 11 of the sleeve pipe body 10 is closed in a state in which a radially outward end 21 of a steel flat bar 2 extending over an entire axial direction of the sleeve pipe body 10 is press-fitted so as to expand the sleeve pipe body 10. A support legs 3 is provided which is installed in the circumferential wall of the sleeve pipe body 10 so as to be able to fall down in a state in which the ends are erected so as to face the slit 11 at both end parts in the axial direction thereof. Then, the flat bar 2 in a state in which the slit 11 is closed is held in a state in which a radially inner end part 22 is inserted through a concave part 311 recessed in the tip of each support leg 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sleeve tube including a sleeve tube main body used when forming a through hole in a concrete structure to be cast and formed, a method for manufacturing the sleeve tube, and a method for manufacturing a through hole using the sleeve tube.

  In general, when forming a through-hole in a concrete structure such as a concrete wall to be cast, concrete is placed around the outer periphery of the sleeve tube with a cylindrical member called a sleeve tube (cavity tube) arranged. The through hole was formed by removing the sleeve tube from the concrete structure which was cast and the concrete was hardened and formed.

  However, as the sleeve tube, paper-made ones are widely used, so that the peelability from the concrete is poor and cannot be extracted after the concrete is hardened. For this reason, after the concrete has hardened, the sleeve tube is peeled off from the concrete while being deformed or broken. As described above, the paper sleeve tube cannot be reused because it is inevitably deformed and damaged when removed from the concrete. Moreover, it takes time to remove the sleeve tube from the concrete, and the burden on the operator is great.

  Therefore, conventionally, a sleeve tube main body having an elastic force provided with a slit extending in the axial direction on the peripheral wall of the cylindrical tube, and an outer diameter larger than the inner diameter of the sleeve tube main body, and the peripheral wall of the cylindrical tube in the axial direction. A first adjustment tube having an elastic force provided with a slit extending in the direction of the first adjustment tube, and an elastic force provided with a slit having an outer diameter larger than the inner diameter of the first adjustment tube and extending in the axial direction on the peripheral wall of the cylindrical tube. A sleeve tube provided with a second adjusting tube is known (see Patent Document 1).

  In this case, the first adjustment pipe is removed by inserting the second adjustment pipe into the first adjustment pipe in a state in which the slit of the first adjustment pipe is expanded by fitting the expansion material, and then the first adjustment is removed. The inner peripheral surface of the tube is pressed against the outer peripheral surface of the second adjustment tube. Next, the first adjusting tube is inserted together with the second adjusting tube into the sleeve tube body in which the slit of the sleeve tube body is expanded by fitting the expanding material, and then the expanding material is removed and the sleeve is removed. The inner peripheral surface of the tube body is brought into pressure contact with the outer peripheral surface of the first adjustment tube. At this time, the slits of the sleeve tube main body and the first and second adjustment tubes are configured to be inconsistent with each other in the circumferential direction.

Japanese Patent Laid-Open No. 2005-200963

  However, in the above-mentioned conventional one, since the sleeve tube is constituted by three tubes, that is, the sleeve tube main body, the first and second adjustment tubes, the slits of the sleeve tube main body and the first adjustment tube are widened in manufacturing. It is necessary to expand the diameter, and each diameter expansion work is very troublesome and takes time. In addition, when manufacturing the sleeve tube, it is indispensable to close the space formed by the slits of the sleeve tube main body with a tape, and the man-hours and costs are increased due to the use of the tape.

  Furthermore, if the space due to the slit is blocked with tape, there is a risk that the concrete exceeding the tension of the tape may enter the slit space of the sleeve pipe body when the concrete is placed, and the first adjustment pipe is removed. There is a concern that the sleeve tube main body can be smoothly removed from the through hole without sufficiently reducing the diameter of the sleeve tube main body. In addition, when removing the sleeve tube main body from the through hole of the concrete structure, it is necessary to remove the three tubes in order, and it takes time to remove the sleeve tube main body, and the removal operation becomes very troublesome.

  The present invention has been made in view of such points, and the object of the present invention is to use only a single sleeve tube body having a slit extending in the axial direction on the peripheral wall of the tube tube, and to simplify the manufacturing operation and the removal operation. An object of the present invention is to provide a sleeve tube that can be made simple, a manufacturing method thereof, and a manufacturing method of a through hole using the sleeve tube.

  In order to achieve the above object, in the present invention, as a sleeve tube provided with a sleeve tube body made of synthetic resin used when forming a through hole in a concrete structure to be cast, A slit extending in the axial direction is provided on the peripheral wall. Furthermore, the slit is closed in a state where the radially outer side end portion of the steel flat bar extending over the entire axial direction of the sleeve tube body is press-fitted so as to expand the diameter of the sleeve tube body. A support leg is provided inside the peripheral wall of the sleeve tube main body so as to be able to fall down in a state where the tip stands up toward the slit at at least both ends in the axial direction. Then, the flat bar in a state where the slit is closed is held in a state where the radially inward end portion is inserted into a concave portion provided in the tip of each support leg.

  Further, it is preferable that the radially outer side end of the flat bar protrudes slightly outward in the radial direction from the outer surface of the peripheral wall of the sleeve tube main body.

  Also, at least one of the axial ends of the sleeve tube main body is closed with a tape material so that a hook member can be opened when the sleeve tube main body is removed from the through hole of the concrete structure. It is preferable to provide a fixed locking hole.

  Further, it is preferable that the slit of the sleeve tube main body is covered with a tape material together with the flat bar from the outside of the peripheral wall.

  Further, at least one of both ends in the longitudinal direction of the flat bar is given a radially inward strike in a state where the support legs are laid down when the flat bar is removed from the slit of the sleeve tube body. It is preferable to provide a stepped portion to be used.

  Furthermore, it is preferable to provide a locking hole for locking the hook member when removing the flat bar from the slit of the sleeve tube main body at least one of the longitudinal ends of the flat bar.

  On the other hand, as a method for manufacturing a sleeve tube including a synthetic resin sleeve tube body used when forming a through-hole in a concrete structure to be cast and formed, the peripheral wall of the sleeve tube body is formed in the axial direction. With respect to the extending slit, the radially outer side end portion of the steel flat bar extending over the entire axial direction of the sleeve tube main body is press-fitted so as to expand the sleeve tube main body, and the slit is closed. . Thereafter, the radially inner end of the flat bar in a state where the slit is closed is laid down in a state where the tip stands up toward the slit at least at both ends in the axial direction inside the peripheral wall of the sleeve tube body. It is characterized in that it is inserted and held respectively in a recessed portion that is recessed at the tip of a support leg that can be installed.

  Moreover, the manufacturing method of the through-hole formed in the concrete-made structure cast-modeled using the sleeve pipe | tube may be sufficient.

  In short, the slit of the sleeve tube main body is closed in a state where the sleeve tube main body is press-fitted so as to expand the diameter of the sleeve tube main body by the radially outer end of the flat bar, and the flat bar is closed to the axis inside the peripheral wall of the sleeve tube main body. The slits of the sleeve tube main body are held by holding the radially inward end portions inserted in the recesses at the tips of the support legs installed so as to be able to fall in an upright state toward the slits at at least both ends in the direction. It can be reliably closed by the press-fitted flat bar. As a result, the concrete does not enter the slit of the sleeve pipe body when the concrete is placed, and the sleeve pipe body can be sufficiently reduced in diameter when the flat bar is removed. Can be removed smoothly. In addition, when removing the sleeve tube from the through hole of the concrete structure, only the single sleeve tube needs to be removed, and the sleeve tube can be removed in a short time and easily.

  Moreover, since the sleeve tube is constituted by a single sleeve tube main body, in manufacturing, only the slit of the single sleeve tube main body needs to be expanded to expand the diameter, and the diameter expansion work is simple and the work time is shortened. Can be achieved. Also, when the sleeve tube is manufactured, the slit of the sleeve tube main body is closed by the radially outer end of the flat bar, so that the work of closing the slit with the tape is not essential, and the manufacturing man-hour and cost are reduced. Reduction can be achieved.

  In addition, by projecting a little amount of the radially outer side end of the flat bar radially outward from the outer surface of the peripheral wall of the sleeve tube body, the concrete enters the slit of the sleeve tube body when placing concrete. The sleeve tube main body can be sufficiently reduced in diameter when the flat bar is removed, and the sleeve tube main body can be removed more smoothly from the through hole.

  Further, at least one of both end portions in the axial direction of the sleeve tube main body is provided with a locking hole closed with a tape material so as to open the hook member so that the hook member can be locked. The operation of removing from the through-hole can be easily performed in a shorter time by the hook member.

  In addition, by covering the slit of the sleeve tube body with tape from the outside of the peripheral wall together with a flat bar, the concrete can be more reliably prevented from entering the slit of the sleeve tube body when placing concrete. The sleeve tube body can be sufficiently reduced in diameter when the bar is removed, and the sleeve tube body can be removed more smoothly from the through hole.

  In addition, the flat bar is provided with a stepped portion that applies a striking inward in the radial direction with each supporting leg lying down on at least one of the longitudinal ends of the flat bar. The work to remove from can be performed more smoothly.

  Further, by providing a locking hole for locking the hook member at at least one of the both ends in the longitudinal direction of the flat bar, when the flat bar is removed from the slit of the sleeve tube body, the removal work can be performed more easily by the locking tool. It can be carried out.

  On the other hand, after pressing the radially outer end of the flat bar made of steel into the slit of the sleeve tube main body and closing the slit, the radially inner end of the flat bar is inserted into the sleeve tube. The slits of the sleeve tube main body are press-fitted by inserting and holding in the recesses at the tips of the support legs that can be laid down while standing up toward the slits at least at both ends in the axial direction inside the peripheral wall of the main body. The flat bar can be securely closed. As a result, the cast concrete does not enter the slit of the sleeve tube body, and the sleeve tube body can be sufficiently reduced in diameter when the flat bar is removed. Can be removed. In addition, when removing the sleeve tube from the through hole of the concrete structure, only the single sleeve tube needs to be removed, and the sleeve tube can be removed in a short time and easily.

  Moreover, when manufacturing a sleeve tube constituted by a single sleeve tube main body, it is only necessary to expand the slit by expanding only the slit of the single sleeve tube main body, and the diameter expansion operation is simple and does not require time. Also, when the sleeve tube is manufactured, the slit of the sleeve tube body is closed by the radially outer end of the flat bar, so that it is not necessary to close the slit with the tape, and the manufacturing man-hours and costs are reduced. Reduction can be achieved.

  In addition, by manufacturing a through-hole formed in a concrete structure that is cast and shaped using a sleeve tube, a sufficient diameter reduction of the sleeve tube body can be expected when the flat bar is removed. The through hole can be easily formed in the concrete structure by removing the sleeve tube body smoothly.

1 is a perspective view of a sleeve tube according to a first embodiment of the present invention. It is the side view which looked at the sleeve pipe | tube of FIG. 1 from the axial direction one end side. It is the longitudinal cross-sectional view which cut | disconnected the sleeve pipe | tube of FIG. 1 in the slit vicinity. It is explanatory drawing which shows the relationship between the space | interval of the slit of the sleeve pipe | tube of FIG. 2, and the thickness of a flat bar. It is a disassembled perspective view of the support leg provided in the sleeve pipe | tube of FIG. It is a front view of the concrete wall which shows the state by which the through-hole was formed with the sleeve pipe | tube of FIG. It is a front view of the concrete wall which shows the state which removed the support leg from the surrounding wall inner surface of the sleeve pipe of FIG. It is a front view of the concrete wall which shows the state which removed the flat bar from the slit of the sleeve pipe | tube of FIG. It is a front view of the concrete wall which shows the state which removed the sleeve pipe | tube of FIG. 8 from the through-hole. It is the side view which looked at the sleeve pipe | tube which concerns on the 2nd Embodiment of this invention from the axial direction one end side. It is the longitudinal cross-sectional view which cut | disconnected the sleeve pipe | tube of FIG. 10 in the slit vicinity. The support leg installed in the sleeve pipe which concerns on the modification of each embodiment is shown, (a) is the front view which looked at the support leg from the axial direction, (b) is the side view of a support leg. The support leg installed in the sleeve tube which concerns on the other modification of each embodiment is shown, (a) is the front view which looked at the support leg from the axial direction, (b) is the side view of a support leg. The support leg installed in the sleeve tube which concerns on the other modification of each embodiment is shown, (a) is the front view which looked at the support leg from the axial direction, (b) is the side view of a support leg. The support leg installed in the sleeve tube which concerns on the other modification of each embodiment is shown, (a) is the front view which looked at the support leg from the axial direction, (b) is the side view of a support leg.

  Hereinafter, an example of a sleeve tube according to an embodiment of the present invention will be described with reference to the drawings.

  1 is a perspective view of a sleeve tube according to a first embodiment of the present invention, FIG. 2 is a side view of the sleeve tube as viewed from one end in the axial direction, and FIG. 3 is a longitudinal sectional view of the sleeve tube cut in the vicinity of the slit. Respectively.

  1 to 3, a sleeve tube 1 is a synthetic resin sleeve tube used for forming a through hole A1 that penetrates a concrete wall A as a concrete structure to be cast and formed in a substantially horizontal direction. A main body 10 is provided. The sleeve tube main body 10 is provided with a slit 11 extending in the axial direction on the peripheral wall thereof. The slits 11 are formed between both ends in the axial direction of the peripheral wall with an interval α of about 4 mm in the circumferential direction of the sleeve tube main body 10, and the sleeve tube main body 10 has an annular shape with a cross section. In this case, the sleeve tube main body 10 is set to have an axial length of 1500 mm, an outer diameter of 114 mm, and a tube thickness of 6.6 mm.

  FIG. 4 is an explanatory diagram showing the relationship between the interval between the slits 11 of the sleeve tube 1 and the thickness of the flat bar. In FIG. 4, the sleeve tube 1 includes a steel flat bar 2 extending over the entire axial direction of the sleeve tube body 10. The flat bar 2 is formed in a plate shape with its short direction extending in the radial direction of the sleeve tube body 10. Further, the flat bar 2 has a thickness β set slightly larger than the interval α between the slits 11 (for example, 1 to 2 mm) and a width (length in the short direction) set to 38 mm. The slit 11 is closed in a state in which the radially outer end 21 of the flat bar 2 is press-fitted so as to expand the diameter of the sleeve tube body 10. In this case, due to the structure of the sleeve tube main body 10, a force in the diameter reducing direction that narrows the interval α of the slit 11 due to the formation of the slit 11 acts on the sleeve tube body 10. The interval is narrower than the interval displayed in the drawing.

  FIG. 5 shows an exploded perspective view of a support leg provided in the sleeve tube 1. As shown in FIG. 5, the sleeve tube 1 includes support legs 3 and 3 that hold both ends of the flat bar 2. Each support leg 3 is installed inside the peripheral wall of the sleeve tube main body 10 so as to be able to fall down in a state where the tip thereof stands up so as to face the slit 11. Each support leg 3 includes a holding side piece 31 that holds the flat bar 2, an installation side piece 32 that is installed inside the peripheral wall of the sleeve tube main body 10, a lower end portion of the holding side piece 31, and an installation side piece 32. A bolt 33 and a nut 34 are provided to fasten the upper end portion from the axial direction of the sleeve tube main body 10. In this case, the width of the support leg 3 (the holding side piece 31 and the installation side piece 32) is set to about 30 mm when viewed from the axial direction of the sleeve tube main body 10.

  Further, the holding side piece 31 of each support leg 3 has a recess 311 recessed at the tip, and the radially inner side end of the flat bar 2 in which the slit 11 is closed by the radially outer end 21. The parts 22 are held in a state where they are respectively inserted into the recesses 311. On the other hand, the installation side piece 32 of each support leg 3 has a pair of legs 321 and 321 projecting toward both sides in the axial direction of the sleeve tube main body 10 at its lower end. And each support leg 3 is divided | segmented into the holding | maintenance side piece 31 and the installation side piece 32 by canceling | releasing the fastening by the volt | bolt 33 and the nut 34, and the state which tends to fall down is obtained. In this case, a weld nut attached to the installation side piece 32 is applied as the nut 34.

  The outer end 21 in the radial direction of the flat bar 2 is in the holding state in which the inner end 22 in the radial direction is inserted into the recess 311 of the holding piece 31 of each support leg 3. The length in the short direction is set so as to project a little (for example, about 1 to 2 mm) outward in the radial direction from the outer surface. The width γ of the recess 311 (the width in the circumferential direction of the sleeve tube main body 10) is slightly larger than the thickness β of the flat bar 2 (for example, about 8 mm). The side end 21 can be smoothly inserted.

  Further, at both ends in the axial direction of the sleeve tube main body 10, when the sleeve tube main body 10 is removed from the through hole A1 of the concrete wall A, the hook member (not shown) is closed with a tape material 41 so as to be able to be locked. A pair of locking holes 12, 12 are provided. The pair of locking holes 12, 12 are opened at positions spaced apart from each other by approximately 180 ° in the circumferential direction at both axial ends of the sleeve tube main body 10. The tape material 41 is adhered to the outer surface of the peripheral wall of the sleeve tube main body 10. In addition, the slit 11 of the sleeve tube main body 10 is covered with the tape material 42 together with the radially outer end 21 of the flat bar 2 from the outside of the peripheral wall. It is affixed to the outside.

  Further, at the both ends in the longitudinal direction of the flat bar 2, when the flat bar 2 is removed from the slit 11 of the sleeve tube main body 10, the supporting leg 3 is laid down, that is, the holding side piece 31 and the installation side piece 32. In the state of being divided, step portions 23 are provided for imparting blows inward in the radial direction. The step portions 23 are formed by inclined surfaces 231 that are positioned on the inner side in the axial direction from the radially outer end toward the radially outer end on both end surfaces of the flat bar 2.

  Furthermore, locking holes 24 for locking hook members (not shown) are provided at both ends in the longitudinal direction of the flat bar 2 when the flat bar 2 is removed from the slit 11 of the sleeve tube body 10. Each of the locking holes 24 is located on the outer side in the axial direction than the holding position by the concave portion 311 of the holding side piece 31 of each support leg 3.

  Next, the manufacturing method of the sleeve pipe 1 provided with the sleeve pipe main body 10 used when forming the through-hole A1 in the concrete wall A to be cast will be described with reference to FIG. FIG. 6 shows a front view of the concrete wall A showing a state in which the through hole A1 is formed by the sleeve tube 1. FIG.

  First, as shown in FIG. 6, the radially outer side end 21 of the flat bar 2 inserted into the peripheral wall of the sleeve tube main body 10 with respect to the slit 11 of the peripheral wall of the sleeve tube main body 10, The slit 11 is closed by press-fitting from the inside in the radial direction so as to expand the diameter. At this time, the locking holes 12 at both ends in the axial direction of the sleeve tube main body 10 are closed by the tape material 41, respectively.

  Thereafter, the support legs 3 and 3 are inserted into the peripheral wall of the sleeve tube main body 10 from both ends thereof. At this time, the holding side piece 31 and the installation side piece 32 are inserted into the peripheral wall of the sleeve tube main body 10 in a state in which the holding side piece 31 and the installation side piece 32 are fastened in advance by the bolt 33 and the nut 34. In addition, each support leg 3 is installed in a state where the tip ends up toward the slit 11 positioned at the upper end of the sleeve tube main body 10 at both axial ends of the sleeve tube main body 10.

  Then, the radially inner end 22 of the flat bar 2 in the state in which the slit 11 is closed is connected to the recess 311 at the tip of the support leg 3 at each end in the axial direction inside the peripheral wall of the sleeve tube body 10, that is, each support leg 3. The holding side piece 31 is inserted and held in the recess 311 at the tip. At this time, the radially outer side end portion 21 of the flat bar 2 protrudes a little (for example, about 1 to 2 mm) outward in the radial direction from the outer surface of the peripheral wall of the sleeve tube main body 10.

  After that, the tape material 42 is covered with the tape material 42 together with the radially outer end 21 of the flat bar 2 from the outside of the peripheral wall of the sleeve 11 with the tape material 42. Stick it on the outside. At this time, by applying an aqueous or oily release material from above the tape members 41 and 42 to the outer peripheral surface of the sleeve tube main body 10, the sleeve tube main body 10 is inserted into the through-hole A1 of the concrete wall A to be cast and formed. You may make it improve peelability. In this case, the slit 11 of the sleeve tube main body 10 is closed by the radially outward end 21 of the flat bar 2, so that the work of covering and closing with the tape material 42 is not essential.

In this state, after the sleeve tube main body 10 is disposed in a state where the through hole A1 is formed on the concrete wall A to be cast and formed so as to be rotatable around its axis, the concrete is applied to the outer periphery of the sleeve tube main body 10. Set up. At this time, the sleeve tube main body 10 rotates about 180 ° around the axis so that the flat bar 2 serves as a weight and the slit 11 faces downward as the concrete is placed.
Then, it waits until concrete hardens and models concrete wall A.

  7 is a front view of the concrete wall A showing a state in which the support legs 3 are removed from the inner surface of the peripheral wall of the sleeve tube 1. FIG. 8 is a front view of the concrete wall A showing a state in which the flat bar 2 is removed from the slit 11 of the sleeve tube 1. FIGS. 9 and 9 are front views of the concrete wall A showing the state where the sleeve tube 1 is removed from the through hole A1.

  As shown in FIG. 7, when the concrete wall A is formed, the support leg 3 is removed from the inner surface of the peripheral wall of the sleeve tube main body 10, and then the flat bar 2 is opened from the slit 11 of the sleeve tube main body 10 as shown in FIG. 8. Remove. When the flat bar 2 is removed, the stepped portions 23 at both ends in the longitudinal direction are respectively subjected to striking inward in the radial direction with a hammer or the like (not shown), and the flat bar 2 is removed from the slit 11. The hook member is locked in the locking hole 24 in the vicinity of the portion 23, and the hook member is pulled to remove the flat bar 2 from the inside of the peripheral wall of the sleeve tube main body 10. At this time, the sleeve tube main body 10 is reduced in diameter when the flat bar 2 is removed from the slit 11 and is separated from the through hole A1 of the concrete wall A.

  Thereafter, the hook member is locked to at least one of the pair of locking holes 12, 12 at either one of the axial ends of the sleeve tube main body 10. Then, by pulling the hook member, as shown in FIG. 9, the sleeve tube main body 10 is removed from the through hole A1 of the concrete wall A, and the through hole A1 is formed in the concrete wall A.

  Therefore, in the present embodiment, the slit 11 of the sleeve tube main body 10 is closed in a state where the sleeve tube main body 10 is press-fitted so as to expand the diameter by the radially outer end 21 of the flat bar 2, and the flat bar 2 However, since both ends in the axial direction inside the peripheral wall of the sleeve tube main body 10 are held in a state where the radially inner end 22 is inserted into the recess 311 at the tip of the holding side piece 31 of each support leg 3, the sleeve The slit 11 of the tube main body 10 can be securely closed by the press-fitted flat bar 2. Thereby, the concrete does not enter the slit 11 of the sleeve pipe body 10 when the concrete wall A is placed, and the diameter of the sleeve pipe body 10 when the flat bar 2 is removed can be expected sufficiently. The sleeve tube main body 10 can be smoothly removed from the through hole A1. In addition, when removing the sleeve tube main body 10 from the through hole A1 of the concrete wall A, only the single sleeve tube main body 10 needs to be removed, and the sleeve tube main body 10 can be removed in a short time and easily. .

  In addition, since the sleeve tube 1 is constituted by the single sleeve tube main body 10, in manufacturing, only the slit 11 of the single sleeve tube main body 10 needs to be expanded to expand the diameter, and the diameter expansion operation is simple. The working time can be shortened. Further, when the sleeve tube 1 is manufactured, the slit 11 of the sleeve tube body 10 is closed by the radially outer end 21 of the flat bar 2, so that the work of closing the slit 11 with tape is essential. Without reducing the manufacturing man-hours and costs.

  Further, since the radially outer end 21 of the flat bar 2 slightly protrudes radially outward from the outer surface of the peripheral wall of the sleeve tube body 10, the slit of the sleeve tube body 10 is placed when placing concrete. 11 can be surely prevented from entering the concrete, the sleeve tube body 10 can be sufficiently reduced in diameter when the flat bar 2 is removed, and the sleeve tube body 10 can be smoothly removed from the through hole A1. The through hole A1 can be easily formed in the concrete wall A.

  In addition, a pair of locking holes 12 and 12 are provided at both ends in the axial direction of the sleeve tube main body 10 so as to open the hook member so that the hook member can be locked. Therefore, the operation of removing the sleeve tube main body 10 from the through hole A1 of the concrete wall A can be performed in a shorter time and easily by the hook member.

  Further, since the slit 11 of the sleeve tube main body 10 is covered with the tape material 42 together with the radially outer side end portion 21 of the flat bar 2 from the outside of the peripheral wall, the sleeve tube main body 10 is placed when placing concrete. Intrusion of concrete into the slit 11 is more reliably prevented, and the sleeve tube main body 10 can be sufficiently reduced in diameter when the flat bar 2 is removed, and the sleeve tube main body 10 can be removed more smoothly from the through hole A1. be able to.

  Moreover, since the level | step-difference part 23 which provides the hit | damage to a radial direction inner side in the state which laid down each support leg 3 is provided in the longitudinal direction both ends of the flat bar 2, the radial direction inward with respect to the level | step-difference part 23 is provided. The operation of removing the flat bar 2 from the slit 11 can be performed more smoothly by applying the impact to the side.

  Furthermore, since the locking holes 24 for locking the hook members are provided at both ends in the longitudinal direction of the flat bar 2, it is easier to use the locking tool when removing the flat bar 2 from the slit 11 of the sleeve tube body 10. Removal work can be performed.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, the sizes of the sleeve tube main body and the support leg are changed. The other configurations except for the size of the sleeve tube main body and the support legs are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  FIG. 10 is a side view of the sleeve tube according to the second embodiment of the present invention as viewed from one axial end, and FIG. 11 is a longitudinal sectional view of the sleeve tube cut in the vicinity of the slit.

  As shown in FIGS. 10 and 11, the sleeve tube 5 includes a sleeve tube body 50 having an axial length set to 1500 mm, an outer diameter set to 370 mm, and a tube thickness set to 10.5 mm. The support leg 51 is divided into a holding side piece 52 and an installation side piece 53, and a lower end portion of the holding side piece 52 and an upper end portion of the installation side piece 53 are fastened by bolts 33 and nuts 34. The support leg 51 has a recess 311 at the tip of the holding-side piece 52 and is set to have a width of about 60 mm when viewed from the axial direction of the sleeve tube main body 50.

  In this embodiment, although the size of the sleeve tube main body 50 is changed, the same operational effects as the first embodiment can be obtained.

  The present invention is not limited to the above-described embodiments, and includes other various modifications. For example, in each of the above-described embodiments, the sleeve tube 1 including the sleeve tube body 10 and the support legs 3 each having the axial length set to 1500 mm, the outer diameter set to 114 mm, and the tube thickness set to 6.6 mm The sleeve tube body 50 and the sleeve tube 5 provided with the respective support legs 51 are used in which the axial length is set to 1500 mm, the outer diameter is set to 370 mm, and the tube thickness is set to 10.5 mm. The size is not limited to these, and as shown in FIGS. 12 to 15, the present invention is also applicable to sleeve tube bodies 60 to 90 and sleeve tubes 6 to 9 having support legs 61 to 91 having different sizes. Needless to say, you can.

  Specifically, as shown in FIGS. 12A and 12B, a sleeve tube main body 60 having an axial length set to 1500 mm, an outer diameter set to 184 mm, and a tube thickness set to 4.7 mm, As shown in FIGS. 13 (a) and 13 (b), the sleeve tube 6 provided with the supporting leg 61 having the holding side piece 62 and the installation side piece 63 separated from each other, and the length in the axial direction is 1500 mm. And a sleeve tube body 70 having an outer diameter set to 133.7 mm and a tube thickness set to 6.0 mm, and a support leg 71 having a holding side piece 72 and an installation side piece 73 which are divided from each other. 7 may be sufficient. Further, as shown in FIGS. 14A and 14B, a sleeve tube body 80 having an axial length set to 1500 mm, an outer diameter set to 113.3 mm, and a tube thickness set to 6.0 mm, As shown in FIGS. 15 (a) and 15 (b), the sleeve tube 8 provided with the supporting leg 81 having the holding side piece 82 and the installation side piece 83 which are divided from each other, and the length in the axial direction is 1500 mm. The sleeve tube 9 includes a sleeve tube main body 90 having an outer diameter set to 87.3 mm and a tube thickness set to 6 mm, and a support leg 91 having a holding side piece 92 and an installation side piece 93 which are divided from each other. May be.

  Further, in each of the above embodiments, the thickness β of the flat bar 2 is set to be 1 mm larger than the interval α of the slits 11, but the thickness of the flat bar is not limited to this, and the thickness of the flat bar The thickness may be set to be slightly larger than the interval between the slits by about 2 mm to 8 mm. In this case, the diameter reduction ratio of the sleeve tubes 1, 5 to 8 when the flat bar 2 is removed increases with an increase in the thickness of the flat bar, and the sleeve tube body 10 is removed from the through hole A1 of the concrete wall A. The work can be performed more easily and quickly.

  Furthermore, in each said embodiment, although the radial direction outer side edge part 21 of the flat bar 2 was protruded about 1-2 mm to the radial direction outward from the outer surface of the surrounding wall of the sleeve pipe | tube main body 10, The radially outer end may coincide with the outer surface of the peripheral wall of the sleeve tube body. In short, when the concrete is placed, the radially outer end of the flat bar leads to the slit of the sleeve tube body. It is only necessary to prevent the intrusion of concrete.

  Further, in each of the above embodiments, each support leg 3 is divided into the holding side piece 31 and the installation side piece 32, but the holding side piece and the installation side piece are integrally formed support legs that do not require bolts and nuts. It may be.

  Further, in each of the embodiments, the step portions 23 and 23 and the locking holes 24 and 24 are provided at both ends in the longitudinal direction of the flat bar 2, but the step portion is provided only at one of the both ends in the longitudinal direction of the flat bar 2. In addition, a locking hole may be provided.

  Further, in each of the above embodiments, the pair of locking holes 12 and 12 are provided at both ends in the axial direction of the sleeve tube main body 10, but a single locking hole or both at the both ends in the axial direction of the sleeve tube main body are provided. A pair of locking holes or a single locking hole may be provided in only one of the both ends in the axial direction of the sleeve tube main body. In each of the above embodiments, the length of the sleeve tube main body 10, 50 to 90 in the axial direction is set to 1500 mm. However, the length of the sleeve tube main body in the axial direction is not limited to this.

  In each of the above embodiments, the support legs 3 are provided at both ends in the axial direction of the sleeve tube main bodies 10 and 50 to 90. However, the support legs are provided at three or more locations including both ends in the axial direction of the sleeve pipe main body. It may be done.

  In each of the above embodiments, the thickness β of the flat bar 2 is slightly larger than the interval α of the slits 11 (for example, 1 to 2 mm) and the width is set to 38 mm. It can be changed according to Specifically, if the outer diameter of the sleeve tube main body is 200 mmya 350 mm, the flat bar can be changed within a range of thickness 6 mm × width 50 mm to thickness 22 mm × width 50 mm.

  Furthermore, in each said embodiment, although the case where the through-hole A1 was formed in the concrete wall A as a concrete structure using the sleeve tubes 1 and 5-9 was described, a concrete beam, a column, a floor, etc. Needless to say, a sleeve tube can also be applied to the case where a through hole is provided in a concrete structure.

A Concrete wall (concrete structure)
A1 Through hole 1 Sleeve tube 10 Sleeve tube main body 11 Slit 12 Locking hole 2 Flat bar 21 Radial outer side end 22 Radial inner side end 23 Step 24 Locking hole 3 Support leg 311 Recess 41 Tape material 42 Tape material 5-9 Sleeve tube 50-90 Sleeve tube body

Claims (8)

A sleeve tube comprising a synthetic resin sleeve tube body used when forming a through-hole in a concrete structure to be cast,
The sleeve tube main body is provided with a slit extending in the axial direction on the peripheral wall thereof,
The slit is closed in a state in which a radially outer side end portion of a steel flat bar extending over the entire axial direction of the sleeve tube main body is press-fitted so as to expand the diameter of the sleeve tube main body. ,
Inside the peripheral wall of the sleeve tube main body is provided with support legs that are installed so that they can fall down in a state where their tips stand up toward the slits at least at both ends in the axial direction,
The flat tube in a state in which the slit is closed is held in a state where a radially inner end portion is inserted into a concave portion provided in a tip of each support leg.   2. The sleeve tube according to claim 1, wherein a radially outer side end of the flat bar slightly protrudes radially outward from an outer surface of a peripheral wall of the sleeve tube body.   At least one of both ends in the axial direction of the sleeve tube main body is closed with a tape material so as to open a hook member so that the hook member can be locked when the sleeve tube main body is removed from the through hole of the concrete structure. The sleeve pipe according to claim 1 or 2, wherein a locking hole is provided.   The sleeve tube according to any one of claims 1 to 3, wherein the slit of the sleeve tube main body is covered with a tape material together with the flat bar from the outside of the peripheral wall.   At least one of the longitudinal ends of the flat bar is hit radially inward with the support legs lying down when the flat bar is removed from the slit of the sleeve tube body. The sleeve tube according to any one of claims 1 to 4, wherein a step portion is provided.   6. A locking hole for locking a hook member when removing the flat bar from the slit of the sleeve tube body is provided in at least one of the longitudinal ends of the flat bar. The sleeve tube as described in any one of these. A method of manufacturing a sleeve tube comprising a sleeve tube body made of a synthetic resin used when forming a through hole in a concrete structure to be cast and formed,
With respect to the slit extending in the axial direction on the peripheral wall of the sleeve tube main body, the diameter of the sleeve tube main body is increased at the radially outer side end portion of the steel flat bar extending over the entire axial direction of the sleeve tube main body. After press-fitting and closing the slit,
The inner end of the flat bar in the radial direction of the flat bar with the slit closed can be laid down in a state where the tip stands up toward the slit at least at both ends in the axial direction inside the peripheral wall of the sleeve tube body. A method of manufacturing a sleeve tube, characterized in that the sleeve tube is inserted and held in a recess formed in the tip of the installed support leg.   The manufacturing method of the through-hole formed in the concrete-made structure cast-shaped using the sleeve pipe | tube as described in any one of Claims 1-6.

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