Void pipe with water-stopping function and water-stopping structure using the void pipe with water-stopping function

Abstract

To ensure water-stopping performance in a gap between a void pipe and piping from the stage where the piping is inserted into a through-hole for piping insertion, and to make it possible to avoid the occurrence of inconvenience in which rainwater or the like accumulated on a floor slab flows down to a lower floor through the gap between the void pipe and the piping.SOLUTION: A sleeve 10 is provided, which is installed at a piping insertion section before concrete placement in a floor slab S. As the floor slab S is constructed by placement of concrete Sb, the sleeve 10 is embedded in the piping insertion section. The sleeve 10 forms a through-hole Sa for piping insertion. The sleeve 10 includes a water-stopping body 11 that closely contacts an outer circumferential surface of piping 1 inserted into the through-hole Sa and water-tightly closes a gap 2 between the piping 1 and the sleeve 10.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a void tube with a water stop function used for forming a through hole for inserting a pipe at a pipe insertion location of a floor slab, and a water stop structure using the void tube with the water stop function.

Background Art

[0002] As the background art of the present invention, for example, in the installation work of drainage pipes in apartment houses, etc., in a through hole (sleeve hole) for inserting a drainage pipe formed by embedding a void tube at the pipe insertion position of a floor slab, after inserting a drainage pipe and connecting it to a drain pipe, there is a method of embedding mortar or the like in the gap between the void tube and the drainage pipe to perform a filling-back operation to fill the gap (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the filling-back operation described in Patent Document 1, since water stoppage is not ensured in the gap between the void tube and the pipe from the stage of inserting the drainage pipe into the through hole until the gap between the void tube and the drainage pipe is filled back with mortar or the like, for example, rainwater accumulated on the floor slab during rainfall may flow down to the lower floor through the gap between the void tube and the pipe, causing inconvenience.

[0005] In view of this situation, the main problem of the present invention is to ensure water stoppage in the gap between the void tube and the pipe from the stage of inserting the pipe into the through hole for inserting the pipe, so as to avoid the occurrence of inconvenience that rainwater accumulated on the floor slab flows down to the lower floor through the gap between the void tube and the pipe.

Means for Solving the Problem

[0006] The first characteristic configuration of the present invention is provided with a sleeve that forms a through-hole for pipe insertion while being embedded in a pipe insertion location of a floor slab. The sleeve is provided with a water stop body that closes the gap between the pipe and the sleeve in a state where it is in close contact with the outer peripheral surface of the pipe inserted into the through-hole so as to be able to stop water.

[0007] According to this configuration, when a pipe is inserted into the through-hole of the floor slab formed by the sleeve, the water stop body comes into close contact with the outer peripheral surface of the pipe and closes the gap between the pipe and the sleeve in a state where it can stop water. As a result, from the stage where the pipe is inserted into the through-hole of the floor slab, it is possible to ensure the water-stopping property of the water stop body in the gap between the pipe and the sleeve. As a result, for example, during pipe installation work where pipes are sequentially inserted into a plurality of through-holes formed in floor slabs on the same floor and connected to pipes from the lower floor, it is possible to avoid the inconvenience that rainwater or the like accumulated on the floor slab during rainfall flows down to the lower floor through the gap between the pipe and the sleeve.

[0008] The second characteristic configuration of the present invention is that the water stop body has a cylindrical fitting portion that is fitted inside the sleeve and fitted outside the pipe, and a flange portion that projects horizontally outward from the upper end portion of the fitting portion and is received at the upper end of the sleeve, and is detachably provided on the upper part of the sleeve.

[0009] According to this configuration, when the water stop body is attached to the upper part of the sleeve that forms the through-hole of the floor slab, the fitting portion of the water stop body enters the sleeve from above the sleeve, and the outer peripheral surface of the fitting portion is in close contact with the inner peripheral surface of the sleeve and is fitted inside the upper part of the sleeve. Also, the flange portion of the water stop body is received at the upper end of the sleeve, and the gap between the fitting portion and the sleeve is covered from above. After that, when a pipe is inserted into the cylindrical fitting portion, the fitting portion fills the gap between the pipe and the sleeve in a state where its inner peripheral surface is in close contact with the outer peripheral surface of the pipe.

[0010] That is, when a water stop is attached to the upper part of the sleeve that forms the through hole of the floor slab and a pipe is inserted into the fitting part of the water stop, the fitting part of the water stop is in close contact with the inner peripheral surface of the sleeve and the outer peripheral surface of the pipe. In this state, the gap between the pipe and the sleeve is filled at the fitting part of the water stop, and the gap between the fitting part and the sleeve is covered from above by the flange part of the water stop.

[0011] As a result, from the stage when the pipe is inserted into the fitting part of the water stop, the gap between the pipe and the sleeve is more reliably closed by the water stop, and the water stopping performance of the water stop in the gap between the pipe and the sleeve can be more preferably ensured. Therefore, it is possible to more reliably avoid the occurrence of inconvenience that rainwater or the like accumulated on the floor slab flows down to the lower floor through the gap between the pipe and the sleeve. In addition, it is possible to prevent rainwater or the like from flowing into and accumulating in the gap between the pipe and the sleeve without the need to refill the gap between the pipe and the sleeve with a filling material such as mortar. Thereby, it is possible to avoid the possibility that rainwater or the like accumulated in the gap has an adverse effect on the water stopping performance of the water stop in the gap.

[0012] And since the water stop is detachably provided on the upper part of the sleeve embedded in the floor slab, when it is necessary to replace the pipe or the like, the pipe can be easily removed together with the water stop from the sleeve embedded in the floor slab. Thereby, for example, it is possible to eliminate the chiseling work of the filling material that is required when the gap between the pipe and the sleeve is refilled with a filling material such as mortar. As a result, the water stopping performance of the water stop in the gap between the pipe and the sleeve can be more preferably ensured, the workability when replacing the pipe or the like can be improved, and the construction period required for replacing the pipe or the like can be shortened.

[0013] The third characteristic configuration of the present invention lies in that the water stop body has an eccentricity corresponding portion capable of corresponding to the eccentricity of the pipe with respect to the through hole within the through hole.

[0014] According to this configuration, for example, in the piping process of piping across the construction floor and the floor directly below it, due to construction errors or the like, within the hole of the through hole for pipe insertion formed in the floor slab of the construction floor, when an eccentricity occurs where the center of the pipe from the floor directly below is displaced with respect to the center of the through hole, the eccentricity corresponding portion of the water stop body corresponds to the eccentricity of the pipe with respect to the through hole at that time. As a result, the water stop body can close the gap between the pipe and the sleeve while maintaining a state of being in close contact with the outer peripheral surface of the pipe, regardless of the eccentricity of the pipe with respect to the through hole.

[0015] As a result, regardless of the eccentricity of the pipe with respect to the through hole within the through hole caused by construction errors or the like, the water stop performance by the water stop body in the gap between the pipe and the sleeve ensured from the stage of inserting the pipe into the through hole of the floor slab can be maintained, and the piping across the construction floor and the floor directly below it can be carried out well.

[0016] The fourth characteristic configuration of the present invention lies in that the sleeve has a leg portion that projects horizontally outward from its lower end portion, enables the sleeve to stand independently when the sleeve is installed at the pipe insertion location before the concrete placement of the floor slab, and enables the fixing of the sleeve by a fixture at the pipe insertion location.

[0017] According to this configuration, when installing the sleeve at the pipe insertion location before the concrete placement in the floor slab, by placing the leg portion of the sleeve on the bottom plate portion of the formwork corresponding to the pipe insertion location, the sleeve can be easily temporarily placed in a state of standing vertically at the pipe insertion location. And by simply fixing the leg portion of the temporarily placed sleeve to the bottom plate of the formwork with a general fixture such as a screw, the sleeve can be installed in a state of being fixed in a vertical posture at the pipe insertion location before the concrete placement in the floor slab without using a dedicated large-scale fixture or the like. Thus, in the concrete placing process after the sleeve is installed, it is possible to prevent inconveniences such as the sleeve being washed away by the concrete and the through-hole for pipe insertion formed by the sleeve being displaced from the pipe insertion position. As a result, while improving the workability when installing the sleeve at the pipe insertion position before concrete placement in the floor slab, it is possible to accurately form a through-hole for pipe insertion at the pipe insertion position of the floor slab.

[0018] Also, as described above, since it is not necessary to use a large dedicated fixture or the like for fixing the sleeve, it becomes possible to install the sleeve at a position closer to the wall. Thus, for example, when installing pipes extending over multiple floors along the wall, the through-hole formed by the sleeve can be arranged at a position closer to the wall in the floor slab. Accordingly, the pipes inserted through the through-hole can be installed over multiple floors in a suitable arrangement closer to the wall and along the wall.

[0019] The fifth characteristic configuration of the present invention is that the sleeve has a rotation prevention portion that protrudes laterally outward from its outer peripheral surface and prevents the rotation of the sleeve with respect to the floor slab after the concrete of the floor slab has hardened.

[0020] For example, when the pipe inserted through the through-hole of the floor slab is a T-shaped pipe joint having a lateral connection portion, after such a pipe is inserted through the through-hole, a rotation operation of the pipe with respect to the floor slab may be performed in order to align the direction of the connection portion with the pipe direction of the lateral pipe to be connected. However, since the state where the pipe is inserted through the through-hole is a state where the water stop body of the sleeve is in close contact with the outer peripheral surface of the pipe, when the rotation operation of the pipe is performed, the sleeve may rotate unnecessarily with respect to the floor slab, resulting in the loss of adhesion between the sleeve and the concrete of the floor slab.

[0021] On the other hand, in this configuration, since the sleeve has the rotation prevention portion described above, when the rotation operation of the pipe is performed with the water stop body of the sleeve in close contact with the outer peripheral surface of the pipe, the rotation of the sleeve with respect to the floor slab associated with this operation is blocked by the rotation prevention portion of the sleeve. As a result, it is possible to prevent the occurrence of the inconvenience that the adhesion between the sleeve and the concrete of the floor slab is lost due to the unnecessary rotation of the sleeve with respect to the floor slab accompanying the rotation operation of the pipe inserted through the through hole of the floor slab.

[0022] The sixth characteristic configuration of the present invention is that a groove portion is formed on the outer peripheral surface of the upper part of the sleeve, which extends in the circumferential direction of the sleeve and enables the removal of unnecessary portions protruding upward from the floor slab after the concrete of the floor slab has hardened.

[0023] According to this configuration, the upper side of the sleeve can be easily cut according to the floor thickness of the floor slab after hardening, and the vertical length of the sleeve can be adjusted to a length suitable for the floor thickness of the floor slab after hardening. As a result, regardless of the floor thickness of the floor slab, a sleeve having a certain vertical length can be used, and the versatility of the void pipe with a water stop function provided with this sleeve can be enhanced.

[0024] Further, at the time of concrete placement, since the upper side of the sleeve is located above the concrete placement height, it is possible to avoid the occurrence of the inconvenience that the concrete splashed up during placement enters the sleeve and adheres to the inner peripheral surface of the sleeve or the like. As a result, it is possible to avoid the possibility that the concrete adhering to the inner peripheral surface of the sleeve or the like has an adverse effect on the water stop performance by the water stop body in the gap between the pipe and the sleeve.

[0025] The seventh characteristic configuration of the present invention is that after the sleeve of the void pipe with a water stop function is embedded in the pipe insertion location of the floor slab to form a through hole for pipe insertion, as the pipe is inserted into the through hole, the water stop body provided in the sleeve closely contacts the outer peripheral surface of the pipe to close the gap between the pipe and the sleeve in a water-tight manner.

[0026] According to this configuration, when the pipe is inserted into the through hole of the floor slab formed by the sleeve, the water stop body closely contacts the outer peripheral surface of the pipe to close the gap between the pipe and the sleeve in a water-tight manner. As a result, from the stage of inserting the pipe into the through hole of the floor slab, it is possible to ensure the water-tightness of the water stop body in the gap between the pipe and the sleeve. As a result, for example, during pipe installation work where pipes are inserted into each of a plurality of through holes formed in the floor slab of the same floor and connected to pipes from the lower floor, it is possible to avoid the inconvenience that rainwater or the like accumulated on the floor slab during rainfall flows down to the lower floor through the gap between the sleeve and the pipe.

Brief Description of the Drawings

[0027]

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[0028] 〔First Embodiment〕 Hereinafter, a first embodiment, which is an example of a mode for carrying out the present invention, will be described with reference to the drawings.

[0029] Figs. 1 to 2 show a water stop structure using a void pipe A1 with a water stop function exemplified in this first embodiment. In this water stop structure, a sleeve 10 provided in the void pipe A1 with a water stop function is embedded in a pipe insertion portion of the floor slab S to form a through hole Sa for pipe insertion. Then, as a straight pipe-shaped pipe joint (socket) 1, which is an example of a pipe, is inserted into the through hole Sa, a dry water stop body 11 provided on the upper part of the sleeve 10 is configured to closely contact the outer peripheral surface of the pipe joint 1 and close the gap 2 (see Fig. 2) between the pipe joint 1 and the sleeve 10 so as to be able to stop water. In addition, as the pipe inserted into the through hole Sa for pipe insertion, in addition to the straight pipe-shaped pipe joint 1, for example, a T-shaped or Y-shaped pipe joint, a manifold, or a drain pipe or a water supply pipe may be used.

[0030] As shown in Fig. 3, the sleeve 10 is installed at the pipe insertion portion of the floor slab S before the concrete is placed. Then, as shown in Figs. 4 to 5, as the concrete Sb is placed and the floor slab S is constructed, the sleeve 10 is embedded in the pipe insertion portion of the floor slab S and forms a through hole Sa for pipe insertion. The sleeve 10 is formed using a hard resin such as vinyl chloride resin. In addition, the sleeve 10 may be formed using, for example, a soft resin or a steel pipe other than the hard resin.

[0031] As shown in FIGS. 3 and 6 to 7, the sleeve 10 projects horizontally outward from its lower end, enabling the sleeve 10 to stand on its own when installed at the pipe insertion location before concrete placement, and also enabling the sleeve 10 to be fixed by screws 3 (see FIG. 3), which is an example of a fixture at the pipe insertion location. Each leg portion 12 is integrally formed with the sleeve 10 in a state of projecting radially outward from the outer peripheral surface of the lower end portion of the sleeve 10. Each leg portion 12 is formed using a hard resin such as vinyl chloride resin.

[0032] With the above configuration, as shown in FIG. 3, when installing the sleeve 10 at the pipe insertion location before concrete placement in the floor slab S, by placing each leg portion 12 of the sleeve 10 on the bottom plate portion of the formwork 4 corresponding to the pipe insertion location, the sleeve 10 can be easily temporarily placed in a state of standing vertically at the pipe insertion location. Then, by simply fixing each leg portion 12 of the temporarily placed sleeve 10 to the bottom plate 4A of the formwork 4 with ordinary screws 3, the sleeve 10 can be installed in a vertically fixed state at the pipe insertion location before concrete placement in the floor slab S without using a dedicated large-scale fixture or the like.

[0033] Thereby, in the concrete placement process after the sleeve is installed, it is possible to prevent the inconvenience that the sleeve 10 is washed away by the concrete Sb and the through-hole Sa for pipe insertion formed by the sleeve 10 is displaced from the pipe insertion location. As a result, while improving the workability when installing the sleeve 10 at the pipe insertion location before concrete placement in the floor slab S, it is possible to accurately form the through-hole Sa for pipe insertion at the pipe insertion location of the floor slab S.

[0034] Also, as described above, since it is not necessary to use a large-scale fixture dedicated to fixing the sleeve 10, the sleeve 10 can be installed at a position closer to the wall surface. As a result, for example, when installing the piping 5 (see FIG. 1) that spans multiple floors along the wall surface, the through hole Sa formed by the sleeve 10 can be arranged at a position closer to the wall surface in the floor slab S. Accordingly, the pipe joint 1 inserted into the through hole Sa, the piping 5 connected to the pipe joint 1, etc. can be installed over multiple floors in a suitable arrangement closer to the wall surface and along the wall surface.

[0035] In addition, as the sleeve 10, four or more leg portions 12 may be formed so as to project radially outward laterally from the outer peripheral surface of the lower end portion of the sleeve 10. Also, two leg portions 12 may be formed so as to project laterally outward from the outer peripheral surfaces of two opposing portions at the lower end portion of the sleeve 10, or a single leg portion 12 may be formed so as to project laterally outward in a flange shape from the outer peripheral surface of the lower end portion of the sleeve 10. Each leg portion 12 may be joined to the outer peripheral surface of the lower end portion of the sleeve 10 by welding, adhesion, or the like. Examples of the piping 5 that spans multiple floors include drain pipes, water supply pipes, and water distribution pipes.

[0036] As shown in FIGS. 4 to 5, a strip-shaped waterstop member 13 that adheres to the hardened concrete Sb and closes the gap between the concrete Sb of the floor slab S and the outer peripheral surface of the sleeve 10 so as to be able to stop water is wound around the outer peripheral surface of the upper and lower intermediate portion of the sleeve 10 when the concrete Sb is placed in the formwork 4 and the floor slab S is constructed. The waterstop member 13 is made of a soft resin having elasticity such as butyl rubber. The waterstop member 13 is joined in a state of being wound around the outer peripheral surface of the sleeve 10 by welding or adhesion to the sleeve 10.

[0037] With the above configuration, for example, it is possible to avoid the inconvenience that rainwater or the like accumulated on the floor slab S during rainfall flows down to the lower floor through the gap between the concrete Sb of the floor slab S and the outer peripheral surface of the sleeve 10.

[0038] Moreover, since a soft resin such as butyl rubber is used for the water stop member 13, even if the concrete Sb of the floor slab S shrinks away from the sleeve 10 as it hardens, the water stop member 13 extends in response to this shrinkage, and a state where the gap between the concrete Sb of the floor slab S and the outer peripheral surface of the sleeve 10 is closed so as to be water-tight is maintained. Thereby, regardless of the shrinkage of the concrete Sb, it is possible to ensure the water-tightness of the water stop member 13 in the gap between the concrete Sb of the floor slab S and the outer peripheral surface of the sleeve 10.

[0039] Incidentally, the water stop member 13 may be integrally formed on the sleeve 10 or the like, for example, by two-color molding of a hard resin forming the sleeve 10 or the like and a soft resin forming the water stop member 13.

[0040] As shown in FIGS. 3 to 4 and FIG. 6, on the upper outer peripheral surface of the sleeve 10, three groove portions 14 are formed that extend in the circumferential direction of the sleeve 10 and enable the excision of unnecessary portions 10A (see FIG. 4) that protrude upward from the floor slab S after the concrete Sb of the floor slab S has hardened.

[0041] With the above configuration, as shown in FIG. 4, the upper side of the sleeve 10 can be easily excised according to the floor thickness of the hardened floor slab S, and the vertical length of the sleeve 10 can be adjusted in four steps including the non-excision state according to the floor thickness of the hardened floor slab S. That is, regardless of the floor thickness of the floor slab S, a sleeve 10 having a certain vertical length can be used, and the versatility of the void pipe A1 with a water stop function provided with this sleeve 10 can be enhanced.

[0042] Further, if the vertical length of the sleeve 10 in its non-excised state is always made longer than the floor thickness of the floor slab S, when the concrete Sb is placed, the upper side of the sleeve 10 will be located above the placing height of the concrete Sb. Thereby, it is possible to avoid the occurrence of the inconvenience that the concrete Sb splashed up during placement enters the sleeve 10 and adheres to the inner peripheral surface of the sleeve 10 or the like. As a result, it is possible to avoid the possibility that the concrete Sb adhering to the inner peripheral surface of the sleeve 10 or the like adversely affects the water stoppage property by the water stop body 11 in the gap 2 between the pipe joint 1 and the sleeve 10.

[0043] Incidentally, the number of formed grooves 14, the intervals, etc. in the sleeve 10 can be variously changed according to the types of floor slabs S with different corresponding floor thicknesses. Further, as the sleeve 10, a film closing sheet that closes the opening at the upper end thereof and prevents the adhesion of the concrete Sb to the inner peripheral surface of the sleeve 10 during concrete placement or the like may be adhered to the upper end. Incidentally, this closing sheet is removed from the upper end of the sleeve 10 after the concrete Sb has hardened.

[0044] As shown in Fig. 2, the water stop body 11 closely contacts the outer peripheral surface of the pipe joint 1 inserted into the through hole Sa for pipe insertion, and closes the gap 2 between the pipe joint 1 and the sleeve 10 so as to be able to stop water. The water stop body 11 is formed of a soft resin such as silicone rubber or elastomer that is softer than the sleeve 10. As shown in Figs. 2, 4, and 6, the water stop body 11 has a cylindrical fitting portion 11A that is fitted inside the sleeve 10 and externally fitted to the pipe joint 1, and a flange portion 11B that projects laterally outward from the upper end portion of the fitting portion 11A and is received at the upper end of the sleeve 10, and is detachably provided on the upper portion of the sleeve 10. On the outer peripheral surface of the fitting portion 11A, three strip-shaped protrusion portions 11a formed in a ring shape extending in the circumferential direction of the fitting portion 11A in a state of protruding laterally outward from the outer peripheral surface are integrally formed. Each protrusion portion 11a closely contacts the inner peripheral surface of the sleeve 10 when the fitting portion 11A is fitted inside the sleeve 10. The flange portion 11B has a peripheral edge portion 11b that is externally fitted to the sleeve 10, and is formed so as to cover the upper end portion of the sleeve 10.

[0045] With the above configuration, as shown in Fig. 4, when the water stop body 11 is attached to the upper portion of the sleeve 10 forming the through hole Sa of the floor slab S, as shown in Fig. 2, the fitting portion 11A of the water stop body 11 enters the sleeve 10 from above the sleeve 10, and is internally fitted to the upper portion of the sleeve 10 in a state where each protrusion portion 11a provided on the outer peripheral surface of the fitting portion 11A is in close contact with the inner peripheral surface of the sleeve 10. Further, the flange portion 11B of the water stop body 11 is received at the upper end of the sleeve 10, and covers the upper end portion of the sleeve 10 in a state of covering the gap between the fitting portion 11A and the sleeve 10 from above. Thereafter, as shown in Figs. 2 and 5, when the pipe joint 1 is inserted into the cylindrical fitting portion 11A, the fitting portion 11A fills the gap 2 between the pipe joint 1 and the sleeve 10 in a state where its inner peripheral surface is in close contact with the outer peripheral surface of the pipe joint 1.

[0046] That is, as shown in FIG. 2, a water stop 11 is attached to the upper part of the sleeve 10 that forms the through hole Sa of the floor slab S. In a state where the pipe joint 1 is inserted into the fitting portion 11A of the water stop 11, each ridge portion 11a of the fitting portion 11A is in close contact with the inner peripheral surface of the sleeve 10, and the inner peripheral surface of the fitting portion 11A is in close contact with the outer peripheral surface of the pipe joint 1. In this state, the gap 2 between the pipe joint 1 and the sleeve 10 is filled by the fitting portion 11A, and the gap between the fitting portion 11A and the sleeve 10 is covered from above by the flange portion 11B of the water stop 11.

[0047] As a result, from the stage where the pipe joint 1 is inserted into the fitting portion 11A of the water stop 11, the water stop 11 more reliably closes the gap 2 between the pipe joint 1 and the sleeve 10, and it is possible to more preferably ensure the water stopping performance of the water stop 11 in the gap 2 between the pipe joint 1 and the sleeve 10. Therefore, for example, during the piping work of sequentially inserting the pipe joint 1 into a plurality of through holes Sa formed in the floor slab S on the same floor and connecting it to the piping 5 (see FIGS. 1 to 2 and FIG. 5) from the lower floor, it is possible to avoid the inconvenience that rainwater or the like accumulated on the floor slab S during rainfall flows down to the lower floor through the gap 2 between the pipe joint 1 and the sleeve 10. Moreover, it is possible to prevent rainwater or the like from flowing into and accumulating in the gap 2 between the pipe joint 1 and the sleeve 10 without the need to refill the gap 2 between the pipe joint 1 and the sleeve 10 with a filling material such as mortar. As a result, it is possible to avoid the possibility that rainwater or the like accumulated in the gap has an adverse effect on the water stopping performance of the water stop 11 in the gap 2.

[0048] In addition, since the water stop 11 is detachably provided on the upper part of the sleeve 10 embedded in the floor slab S, when it is necessary to replace the pipe joint 1 or the like, the pipe joint 1 can be easily removed together with the water stop 11 with respect to the sleeve 10 embedded in the floor slab S. As a result, for example, it is possible to eliminate the chiseling work of the filling material that would be required when the gap 2 between the pipe joint 1 and the sleeve 10 is refilled with a filling material such as mortar. As a result, it is possible to more suitably ensure the water stoppage property by the water stopper 11 in the gap 2 between the pipe joint 1 and the sleeve 10, improve the workability when replacing the pipe joint 1, etc., and shorten the construction period required for replacing the pipe joint 1, etc.

[0049] In addition, as the water stopper 11, for example, a soft resin that forms an inner peripheral surface side of a fitting portion 11A that is in close contact with the outer peripheral surface of the pipe joint 1 and a ridge portion 11a that is in close contact with the inner peripheral surface of the sleeve 10, and a hard resin that forms the main body portion of the fitting portion 11A other than these may be formed by two-color molding. Further, the flange portion 11B may not have the peripheral edge portion 11b described above.

[0050] As shown in FIGS. 2 and 7, the sleeve 10 has three rotation prevention portions 15 that project laterally outward from its outer peripheral surface and prevent the rotation of the sleeve 10 with respect to the floor slab S after the concrete Sb of the floor slab S has hardened. Each rotation prevention portion 15 is formed as a ridge extending from the base end portion of the corresponding leg portion 12 along the outer peripheral surface of the sleeve 10 to the upper and lower intermediate portions of the sleeve 10. Each rotation prevention portion 15 is integrally formed with the sleeve 10 together with each leg portion 12. Each rotation prevention portion 15 is formed using a hard resin such as vinyl chloride resin.

[0051] With this configuration, for example, when the pipe joint 1 has a T-shape with a horizontal connection portion, etc., the pipe joint 1 is inserted into the fitting portion 11A of the water stopper 11 attached to the upper portion of the sleeve 10, and when a rotation operation of the pipe joint 1 is performed to align the direction of the connection portion with the piping direction of the horizontal piping in a state where the fitting portion 11A of the water stopper 11 is in close contact with the pipe joint 1 and the sleeve 10, along with this operation, it is possible to prevent the occurrence of inconvenience that the sleeve 10 rotates unnecessarily with respect to the floor slab S and the adhesion between the sleeve 10 and the concrete Sb of the floor slab S is lost.

[0052] Further, each rotation prevention portion 15 may be formed at an upper and lower intermediate portion of the outer peripheral surface of the sleeve 10 at a predetermined interval upward from each leg portion 12. Further, each rotation prevention portion 15 may be coupled to the outer peripheral surface of the sleeve 10 by welding, adhesion, or the like.

[0053] 〔Second Embodiment〕 Hereinafter, as an example of a mode for carrying out the present invention, a second embodiment in which the configuration of the void pipe with a water stop function according to the present invention is different from the above-described first embodiment will be described with reference to the drawings.

[0054] As shown in FIG. 8, in the water stop structure using the void pipe A2 with a water stop function exemplified in the second embodiment, the sleeve 20 provided in the void pipe A2 with a water stop function is embedded in the pipe insertion portion of the floor slab S, and after the through hole Sa for pipe insertion is formed, as the straight pipe-shaped pipe joint (socket) 1, which is an example of a pipe, is inserted into the through hole Sa, the dry water stop body 21 provided in the upper and lower intermediate portion of the sleeve 20 is configured to closely contact the outer peripheral surface of the pipe joint 1 and close the gap 2 between the pipe joint 1 and the sleeve 20 so as to be able to stop water.

[0055] As shown in FIGS. 8 to 9, after the sleeve 20 is installed at the pipe insertion portion of the floor slab S before the concrete is placed, as the concrete Sb is placed and the floor slab S is constructed, the sleeve 20 is embedded in the pipe insertion portion of the floor slab S to form the through hole Sa for pipe insertion. The sleeve 20 is formed using a soft resin such as silicone rubber or elastomer.

[0056] As shown in FIGS. 8 to 11, the sleeve 20 has three leg portions 22 that also serve as the leg portions 12 and the rotation prevention portions 15 exemplified in the first embodiment, and three groove portions 24 (see FIGS. 9 to 10) similar to the groove portion 14 exemplified in the first embodiment are formed on the outer peripheral surface of the upper portion of the sleeve 20. Each leg portion 22 is formed using a hard resin such as vinyl chloride resin. Each leg portion 22 is integrally formed on the outer peripheral surface of the lower side of the sleeve 20 by two-color molding of the soft resin forming the sleeve 20 and the hard resin forming the leg portion 22. Furthermore, each leg portion 22 may be coupled to the outer peripheral surface of the sleeve 20 by welding, adhesion, or the like. Similar to the leg portion 12 exemplified in the first embodiment described above, each leg portion 22 may be formed so as to be fixable by a fixture such as a screw 3 at the pipe insertion location before concrete placement in the floor slab S.

[0057] As shown in FIGS. 8 to 11, three waterstop members 23 are integrally formed on the outer peripheral surface of the upper and lower intermediate portions of the sleeve 20 in a ring shape extending in the circumferential direction of the sleeve 20 in a state of protruding laterally outward from the outer peripheral surface. Each waterstop member 23 is formed using a soft resin such as silicone rubber or elastomer. As shown in FIGS. 8 to 9, when the concrete Sb is placed in the formwork 4 and the floor slab S is constructed, each waterstop member 23 adheres to the hardened concrete Sb and closes the gap between the concrete Sb of the floor slab S and the outer peripheral surface of the sleeve 20 so as to be able to stop water.

[0058] As shown in FIGS. 9 and 12, the void pipe A2 with a waterstop function includes, as accessories, shape-retaining core members 25 that are detachably fitted inside the upper and lower portions of the sleeve 20. Each core member 25 is formed using a hard resin such as vinyl chloride resin. Each core member 25 has a cylindrical portion 25A that is in surface contact with the inner peripheral surface of the sleeve 20, a boss portion 25B located at their central portions, and four arm portions 25C that extend radially from their boss portions 25B and cover the cylindrical portion 25A. In each cylindrical portion 25A, deformation due to external pressure is prevented by integrally forming the aforementioned boss portion 25B and each arm portion 25C. That is, in each core member 25, the boss portion 25B and each arm portion 25C function as a reinforcing portion that prevents deformation of the cylindrical portion 25A due to external pressure.

[0059] With the above configuration, as shown in Figure 9, when installing the void pipe A2 with a water stop function at the pipe insertion location before concrete placement in the floor slab S, each core member 25 is internally fitted to the upper and lower parts of the sleeve 20, thereby avoiding the possibility of the sleeve 20 deforming under the pressure when the concrete Sb of the floor slab S is placed. Then, as shown in Figure 8, after the concrete Sb of the floor slab S has hardened, by removing each core member 25 from the sleeve 20, the pipe joint 1 can be inserted into the through-hole Sa of the floor slab S formed by the sleeve 20.

[0060] As shown in Figure 8, the water stop body 21 closely contacts the outer peripheral surface of the pipe joint 1 inserted into the through-hole Sa for pipe insertion, and closes the gap 2 between the pipe joint 1 and the sleeve 20 so as to be able to stop water. The water stop body 21 is formed using a soft resin such as silicone rubber. The water stop body 21 is integrally formed on the inner peripheral surface of the upper and lower intermediate parts of the sleeve 20. As shown in Figures 8 to 11, the water stop body 21 has a ring-shaped fitting part 21A that externally fits and closely contacts the outer peripheral surface of the pipe joint 1, and a film-shaped closing part 21B that closes the space between the fitting part 21A and the inner peripheral surface of the sleeve 20.

[0061] With the above configuration, as shown in Figure 8, when the pipe joint 1 is inserted into the through-hole Sa of the floor slab S formed by the sleeve 20, accordingly, the pipe joint 1 is internally fitted to the fitting part 21A of the water stop body 21, and the fitting part 21A is in a state of closely contacting the outer peripheral surface of the pipe joint 1. As a result, the water stop body 21 is in a state of closely contacting the outer peripheral surface of the pipe joint 1 and closing the gap 2 between the pipe joint 1 and the sleeve 20 so as to be able to stop water. Therefore, from the stage when the pipe joint 1 is inserted into the through-hole Sa of the floor slab S, the water stopping performance of the water stop body in the gap 2 between the pipe joint 1 and the sleeve 20 can be ensured. As a result, for example, during the piping work of sequentially inserting the pipe joint 1 into a plurality of through-holes Sa formed in the floor slab S on the same floor and connecting it to the pipe 5 from the lower floor, etc., it is possible to avoid the inconvenience that rainwater or the like accumulated on the floor slab S during rainfall flows down to the lower floor through the gap 2 between the pipe joint 1 and the sleeve 20.

[0062] As shown in FIGS. 8 to 11, the water stop body 21 has an eccentricity corresponding portion B that can correspond to the eccentricity of the pipe joint 1 with respect to the through hole Sa in the through hole Sa formed by the sleeve 20. The eccentricity corresponding portion B is constituted by the above-described film-like closing portion 21B, and the closing portion 21B is formed in a downwardly narrowing shape. Thereby, the eccentricity corresponding portion B has an extra length that allows the eccentricity of the fitting portion 21A with respect to the sleeve 20 within the sleeve 20. And by having this extra length, as shown in FIG. 8, when an eccentricity occurs in which the center C2 of the pipe joint 1 is displaced with respect to the center C1 of the through hole Sa in the through hole Sa formed by the sleeve 20, the eccentricity corresponding portion B deforms while flexibly expanding and contracting according to the eccentricity direction and eccentricity amount at that time, and follows the eccentricity of the pipe joint 1 with respect to the through hole Sa at that time, allowing the eccentricity of the fitting portion 21A corresponding to the eccentricity of the pipe joint 1.

[0063] Thereby, for example, in a piping process (see FIG. 1) of connecting the piping 5 on the construction floor to the piping 5 on the floor slab S of the construction floor via the pipe joint 1 inserted into the through hole Sa for piping formed in the floor slab S of the construction floor through the piping 5 from the floor directly below the construction floor, it is assumed that an eccentricity occurs in which the center C3 of the piping 5 from the floor directly below is displaced with respect to the center C1 of the through hole Sa for piping due to construction errors or the like (see FIG. 8). In this case, as shown in FIG. 8, after inserting the pipe joint 1 into the through hole Sa and fitting it inside the fitting portion 21A of the water stop body 21, in order to enable connection with the piping 5 from the floor directly below, the pipe joint 1 is eccentric with respect to the through hole Sa within the through hole Sa according to the eccentricity of the piping 5 with respect to the through hole Sa. Then, according to the eccentricity direction and eccentricity amount of the pipe joint 1 at this time, the eccentricity corresponding portion B deforms while flexibly expanding and contracting, and makes the fitting portion 21A follow the eccentricity of the pipe joint 1 with respect to the through hole Sa at this time. Thereby, the movement of the fitting portion 21A corresponding to the eccentricity of the pipe joint 1 is allowed, and the fitting portion 21A is displaced according to the eccentricity of the pipe joint 1 at this time while maintaining a close state with respect to the pipe joint 1. Thereby, while ensuring the water stop performance by the water stop body 21 in the gap 2 between the pipe joint 1 and the sleeve 20, the pipe joint 1 can be connected to the piping 5 from the floor directly below.

[0064] As a result, regardless of the eccentricity of the pipe joint 1 with respect to the through hole Sa in the through hole Sa caused by construction errors or the like, from the stage of inserting the pipe joint 1 into the through hole Sa of the floor slab S, the water stop function of the water stop body 21 in the gap 2 between the pipe joint 1 and the sleeve 20 can be ensured, and the piping and the like can be performed well over the construction floor and the floor immediately below it without impairing the water stop function.

[0065] In addition, in the second embodiment, as the void pipe A2 with a water stop function, the sleeve 20 formed of a soft resin is exemplified, but the present invention is not limited to this. For example, the sleeve 20 may be formed of a hard resin such as vinyl chloride resin other than the soft resin or a steel pipe. In this case, the void pipe A2 with a water stop function may be integrally formed by two-color molding of, for example, a hard resin forming the sleeve 10 and the leg portion 22 and a soft resin forming the water stop member 23 and the water stop body 21. Alternatively, the water stop members 23 and the water stop bodies 21 may be joined to the sleeve 10 in which the leg portions 22 are integrally formed by welding, adhesion, or the like, or the leg portions 22, the water stop members 23, and the water stop bodies 21 may be joined to the sleeve 10 by welding, adhesion, or the like.

[0066] In addition, in the second embodiment, after the piping over the construction floor and the floor immediately below it is completed, the gap 2 between the pipe joint 1 and the sleeve 20 may be filled with a filler such as mortar to fill the gap 2.

[0067] 〔Third Embodiment〕 Hereinafter, as an example of a mode for carrying out the present invention, a third embodiment in which the configuration of the void pipe with a water stop function according to the present invention is different from the first and second embodiments described above will be described with reference to the drawings. In addition, since the void pipe with a water stop function exemplified in the third embodiment only has a different configuration of the water stop body from the void pipe with a water stop function exemplified in the first embodiment, in the following, based on the void pipe with a water stop function exemplified in the first embodiment, only the different configurations of the water stop body will be described.

[0068] As shown in FIGS. 13 to 16, the water stop member 11 of the void tube A1 with a water stop function exemplified in the third embodiment has an eccentricity corresponding portion B that can correspond to the eccentricity of the pipe joint 1 with respect to the through hole Sa in the through hole Sa formed by the sleeve 10.

[0069] Specifically, as shown in FIGS. 13 to 18, in this water stop member 11, the fitting portion 11A has a cylindrical outer annular member 11Aa that is rotatably fitted inside the through hole Sa formed by the sleeve 10, and a cylindrical inner annular member 11Ab that is rotatably fitted inside the outer annular member 11Aa.

[0070] The outer annular member 11Aa is formed in a cylindrical shape in which both the outer circumference and the inner circumference are circular, but is formed in an eccentric shape in which the center position of the outer circumference and the center position of the inner circumference are different. As a result, the wall thickness between the inner circumference and the outer circumference changes in the circumferential direction. In FIG. 17, with respect to the center C4 of the circular outer circumference of the outer annular member 11Aa, the center of the circular inner circumference of the outer annular member 11Aa is eccentric to the right in the drawing plane. As a result, in the outer annular member 11Aa shown in FIG. 17, the portion on the left side of the drawing plane becomes the maximum wall thickness portion t1a where the wall thickness between the inner circumference and the outer circumference is the largest, and the opposite portion on the right side of the drawing plane becomes the minimum wall thickness portion t1b where the wall thickness between the inner circumference and the outer circumference is the smallest.

[0071] On the outer annular member 11Aa, the outer peripheral side is formed as a fitting portion that is fitted inside the sleeve 10, and the inner peripheral side is formed as a first eccentric fitting portion 11c into which the inner annular member 11Ab is fitted. In this way, the outer annular member 11Aa is provided with a first eccentric fitting portion 11c into which the inner annular member 11Ab is fitted in a region eccentric from the center C4 of its outer circumference.

[0072] The inner annular member 11Ab is also formed in a cylindrical shape in which both the outer circumference and the inner circumference are circular, but is formed in an eccentric shape in which the center position of the outer circumference and the center position of the inner circumference are different. As a result, the wall thickness between the inner circumference and the outer circumference changes in the circumferential direction.

[0073] In the inner annular member 11Ab, its outer peripheral side is formed as a fitting portion that is internally fitted into the first eccentric fitting portion 11c of the outer annular member 11Aa, and its inner peripheral side is formed as a second eccentric fitting portion 11d into which the pipe joint 1 is internally fitted. In this way, the inner annular member 11Ab is provided with a second eccentric fitting portion 11d into which the pipe joint 1 is internally fitted in a region eccentric from the center C5 of its outer periphery.

[0074] Since the inner annular member 11Ab is rotatable relative to the outer annular member 11Aa, by rotating the inner annular member 11Ab, the wall thickness between the inner periphery and the outer periphery of the inner annular member 11Ab relative to the outer annular member 11Aa can be adjusted. For example, as shown in FIG. 17(a), when the inner annular member 11Ab is rotated such that the center of the circular inner periphery of the inner annular member 11Ab is eccentric to the left in the drawing plane with respect to the center C5 of the circular outer periphery of the inner annular member 11Ab, in the inner annular member 11Ab, the part on the right side of the drawing plane becomes the maximum wall thickness part t2a where the wall thickness between the inner periphery and the outer periphery is the largest, and the opposite part on the left side of the drawing plane becomes the minimum wall thickness part t2b where the wall thickness between the inner periphery and the outer periphery is the smallest. Conversely, as shown in FIG. 17(b), when the inner annular member 11Ab is rotated such that the center of the circular inner periphery of the inner annular member 11Ab is eccentric to the right in the drawing plane with respect to the center C5 of the circular outer periphery of the inner annular member 11Ab, in the inner annular member 11Ab, the part on the left side of the drawing plane becomes the maximum wall thickness part t2a, and the opposite part on the right side of the drawing plane becomes the minimum wall thickness part t2b.

[0075] Both the outer annular member 11Aa and the inner annular member 11Ab have the center of the circular inner circumference offset from the center of the circular outer circumference. However, as shown in FIGS. 17 to 18, the offset distances d1 and d2 are set to the same distance. In FIGS. 17(a) and 18, in the outer annular member 11Aa, the center of the circular inner circumference is offset by the offset distance d1 to the right side of the paper with respect to the center of the circular outer circumference, while in the inner annular member 11Ab, the center of the circular inner circumference is offset by the same offset distance d2 as d1 to the left side of the paper, which is the opposite direction to the outer annular member 11Aa, with respect to the center of the circular outer circumference. In FIG. 17(b), in addition to the center of the circular inner circumference of the outer annular member 11Aa being offset by the offset distance d1 to the right side of the paper with respect to the center of the circular outer circumference, in the inner annular member 11Ab, the center of the circular inner circumference is offset by the same offset distance d2 as d1 to the right side of the paper, which is the same direction as the outer annular member 11Aa, with respect to the center of the circular outer circumference.

[0076] As a result, when the fitting portion 11A is relatively rotated between the outer annular member 11Aa and the inner annular member 11Ab fitted inside the first eccentric fitting portion 11c of the outer annular member 11Aa, and the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa is changed, according to the rotation angle at this time, the eccentricity of the first eccentric fitting portion 11c in the outer annular member 11Aa and the eccentricity of the second eccentric fitting portion 11d in the inner annular member 11Ab are combined, and the eccentricity amount and the eccentricity direction of the second eccentric fitting portion 11d with respect to the outer annular member 11Aa are changed.

[0077] Also, as described above, the outer annular member 11Aa and the inner annular member 11Ab are set such that the offset distances d1 and d2 of the eccentric fitting portions 11c and 11d therein are the same distance.

[0078] As a result, for example, as shown in FIGS. 13 and 17(a), the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa is changed such that the eccentric direction of the second eccentric fitting portion 11d in the inner annular member 11Ab is the exact opposite direction (leftward in the drawing in FIGS. 13 and 17(a)) with respect to the eccentric direction of the first eccentric fitting portion 11c in the outer annular member 11Aa (rightward in the drawing in FIGS. 13 and 17(a)). Then, the amount of eccentricity (eccentric distance d1) of the first eccentric fitting portion 11c in the outer annular member 11Aa and the amount of eccentricity (eccentric distance d2) of the second eccentric fitting portion 11d in the inner annular member 11Ab are offset. And due to this offset, the fitting state of the outer annular member 11Aa and the inner annular member 11Ab becomes a zero-eccentric state where the second eccentric fitting portion 11d of the outer annular member 11Aa and the inner annular member 11Ab are concentrically positioned and the amount of eccentricity of the second eccentric fitting portion 11d with respect to the outer annular member 11Aa becomes zero. And in this zero-eccentric state, the circumferential wall thickness of the fitting portion 11A becomes constant at the sum of the maximum circumferential wall thickness portion t1a of the outer annular member 11Aa and the minimum circumferential wall thickness portion t2b of the inner annular member 11Ab overlapping, and the minimum circumferential wall thickness portion t1b of the outer annular member 11Aa and the maximum circumferential wall thickness portion t2a of the inner annular member 11Ab overlapping.

[0079] Further, for example, as shown in FIGS. 15(b) and 17(b), the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa is changed so that the eccentric direction of the second eccentric fitting portion 11d in the inner annular member 11Ab is the same direction (the right direction in the paper surface in FIGS. 15(b) and 17(b)) as the eccentric direction of the first eccentric fitting portion 11c in the outer annular member 11Aa. Then, the eccentricity (eccentric distance d2) of the second eccentric fitting portion 11d in the inner annular member 11Ab is added to the eccentricity (eccentric distance d1) of the first eccentric fitting portion 11c in the outer annular member 11Aa. And by this addition, the fitting state between the outer annular member 11Aa and the inner annular member 11Ab becomes the maximum eccentric state where the eccentricity of the second eccentric fitting portion 11d with respect to the outer annular member 11Aa is the maximum (eccentric distance d1 + d2). And in this maximum eccentric state, the circumferential thickness of the fitting portion 11A gradually changes between the maximum thickness obtained by adding the maximum circumferential thickness portions t1a and t2a of the outer annular member 11Aa and the inner annular member 11Ab, and the minimum thickness obtained by adding the minimum circumferential thickness portions t1b and t2b of the outer annular member 11Aa and the inner annular member 11Ab, because the maximum circumferential thickness portion t2a of the inner annular member 11Ab overlaps with the maximum circumferential thickness portion t1a of the outer annular member 11Aa, and the minimum thickness portion t2b of the inner annular member 11Ab overlaps with the minimum circumferential thickness portion t2b of the outer annular member 11Aa.

[0080] That is, by changing the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa, the fitting state between the outer annular member 11Aa and the inner annular member 11Ab can be changed between the above-described zero eccentric state (see FIGS. 13(a) and 17(a)) and the maximum eccentric state (see FIGS. 15(b) and 17(b)). Accordingly, the eccentricity and the eccentric direction of the second eccentric fitting portion 11d with respect to the outer annular member 11Aa can be changed, and the circumferential thickness of the fitting portion 11A can be changed.

[0081] Here, for example, in a piping process (see FIG. 1) of connecting the piping 5 on the construction floor through a pipe joint 1 inserted into a through hole Sa for piping formed in the floor slab S of the construction floor via the piping 5 from the floor directly below the construction floor, it is assumed that an eccentricity occurs in which the center C3 of the piping 5 from the floor directly below is displaced with respect to the center C1 of the through hole Sa for piping due to construction errors or the like (see (b) in FIGS. 15 and 17). In this case, for example, after fitting the outer annular member 11Aa into the through hole Sa for piping, an inner annular member 11Ab in which the pipe joint 1 is internally fitted to the second eccentric fitting portion 11d is fitted into the first eccentric fitting portion 11c of the outer annular member 11Aa. Then, the rotation angle of the outer annular member 11Aa with respect to the through hole Sa and the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa are changed so that the center C2 of the pipe joint 1 coincides with the center C3 of the piping 5 from the floor directly below. Then, by changing these rotation angles, while maintaining the state where the inner peripheral surface of the inner annular member 11Ab is in close contact with the outer peripheral surface of the pipe joint 1, the eccentricity amount and the eccentricity direction of the pipe joint 1 in the outer annular member 11Aa can be gradually changed to correspond to the eccentricity amount and the eccentricity direction of the piping 5 with respect to the through hole Sa, and the position of the pipe joint 1 in the outer annular member 11Aa can be eccentric to a position connectable to the piping 5 from the floor directly below. Thereby, as shown in (b) of FIGS. 15 and 17, the pipe joint 1 can be connected to the piping 5 from the floor directly below while ensuring the water stoppage property by the water stopper 11 in the gap 2 between the pipe joint 1 and the sleeve 10.

[0082] Also, in the above piping process, even when there is no eccentricity of the pipe 5 with respect to the through-hole Sa for pipe insertion due to construction errors or the like (see (a) of FIGS. 13 and 17), similar to the case where eccentricity occurs, by changing the rotation angle of the outer annular member 11Aa with respect to the through-hole Sa and the rotation angle of the inner annular member 11Ab with respect to the first eccentric fitting portion 11c of the outer annular member 11Aa, the position of the pipe joint 1 in the outer annular member 11Aa can be displaced to a position connectable to the pipe 5 from the directly lower floor (position in a zero eccentricity state). Thereby, as shown in FIGS. 13 and 17(a), while ensuring the water stoppage property of the water stopper 11 in the gap 2 between the pipe joint 1 and the sleeve 10, the pipe joint 1 can be connected to the pipe 5 from the directly lower floor.

[0083] That is, in the present third embodiment, the first eccentric fitting portion 11c of the outer annular member 11Aa and the inner annular member 11Ab fitted inside the first eccentric fitting portion 11c are configured to function as the above-described eccentricity corresponding portion B.

[0084] As a result, regardless of the eccentricity of the pipe joint 1 with respect to the through-hole Sa in the through-hole Sa caused by construction errors or the like, without impairing the water stoppage property of the water stopper 21 in the gap 2 between the pipe joint 1 and the sleeve 20 ensured from the stage of inserting the pipe joint 1 into the through-hole Sa of the floor slab S, the piping and the like between the above-described construction stage and its directly lower floor can be performed well.

[0085] As shown in FIGS. 18 to 20, the inner annular member 11Ab has a flange portion 11e that projects horizontally outward from the upper end portion of the fitting portion 11A. The outer annular member 11Aa has a ring-shaped recess 11f that receives the flange portion 11e of the inner annular member 11Ab. The recess 11f is formed such that its depth is the same as the thickness of the flange portion 11e. Thereby, as shown in FIGS. 13 and 15, the fitting depth of the inner annular member 11Ab with respect to the outer annular member 11Aa in a state where the inner annular member 11Ab is fitted inside the outer annular member 11Aa can be made constant, and the upper end surface of the outer annular member 11Aa and the upper end surface of the inner annular member 11Ab can be flush.

[0086] The water stop body 11 is such that the inner annular member 11Ab is formed of a soft resin such as silicone rubber or an elastomer, while the outer annular member 11Aa is integrally formed by two-color molding of a soft resin such as silicone rubber or an elastomer forming the ridge portion 11a (see FIG. 18) and a hard resin such as vinyl chloride resin forming other than the ridge portion 11a. Thereby, for example, compared with the case where the entire outer annular member 11Aa is formed of a soft resin such as silicone rubber or an elastomer, it is possible to prevent the adhesion between them from becoming excessively high in a state where the inner annular member 11Ab is fitted inside the outer annular member 11Aa, and it is possible to facilitate the relative rotation between the outer annular member 11Aa and the inner annular member 11Ab.

[0087] 〔Another Embodiment〕 Another embodiment of the present invention will be described. In addition, the configurations of the respective other embodiments described below are not limited to being applied individually, and can also be applied in combination with the configurations of the above-described embodiments and other other embodiments.

[0088] (1) As the void pipes A1, A2 with a water stop function, as shown in FIG. 21, the sleeves 10, 20 thereof may be provided with a water stop body 11 having the eccentric corresponding portion B exemplified in the second embodiment above and a water stop body 21 having the eccentric corresponding portion B exemplified in the third embodiment.

[0089] (2) As the void pipes A1, A2 with a water stop function, the sleeves 10, 20 thereof may be provided with a holder that enables the installation of a refractory material for closing the gap 2 between the pipe joint 1 and the sleeves 10, 20 inside.

[0090] (3) As the void pipe A1 with a water stop function exemplified in the above first embodiment and third embodiment, it may be configured such that the upper surface of the water stop body 11 is flush with the slab surface of the floor slab S when embedded in the floor slab S. Also, as the void pipe A2 with a water stop function exemplified in the above second embodiment, it may be configured such that the upper end of the sleeve 20 is at the same height as the slab surface of the floor slab S when embedded in the floor slab S.

[0091] (4) The void pipes A1 and A2 with a water stop function according to the present invention are not limited to the case of forming the through hole Sa at the pipe insertion location of the floor slab S at the construction site, and may also be applied to the case of forming the through hole Sa at the pipe insertion location of a precast concrete floor slab member (an example of the floor slab S) at a manufacturing factory or the like.

Explanation of Reference Numerals

[0092] 1 Pipe 2 Gap 3 Fixture 10 Sleeve 10A Useless Portion 11 Water Stop Body 11A Fitting Portion 11B Flange Portion 12 Leg 14 Groove 15 Rotation Prevention Portion 20 Sleeve 21 Water Stop Body 22 Leg 24 Groove A1 Void Pipe with Water Stop Function A2 Void Pipe with Water Stop Function B Eccentricity Corresponding Portion S Floor Slab Sa Through Hole Sb Concrete

Claims

1. A void pipe with a water-stop function is provided with a sleeve that forms a through-hole for inserting a pipe in a state of being embedded in a pipe insertion portion of a floor slab, and the sleeve is provided with a water-stop body that closes the gap between the pipe and the sleeve in a watertight manner by closely contacting the outer peripheral surface of the pipe inserted into the through-hole.

2. The water-stop body has a cylindrical fitting portion that is fitted inside the sleeve and externally fitted to the pipe, and a flange portion that projects laterally outward from the upper end portion of the fitting portion and is received at the upper end of the sleeve, and is detachably provided at the upper part of the sleeve. The void pipe with a water-stop function according to Claim 1.

3. The water-stop body has an eccentricity-corresponding portion that can correspond to the eccentricity of the pipe with respect to the through-hole within the through-hole. The void pipe with a water-stop function according to Claim 1.

4. The sleeve projects laterally outward from its lower end portion, enabling self-standing when the sleeve is installed at the pipe insertion portion before the concrete of the floor slab is placed, and having legs that enable fixing of the sleeve by a fixture at the pipe insertion portion. The void pipe with a water-stop function according to any one of Claims 1 to 3.

5. The sleeve has a rotation-preventing portion that projects laterally outward from its outer peripheral surface to prevent rotation of the sleeve with respect to the floor slab after the concrete of the floor slab has hardened. The void pipe with a water-stop function according to any one of Claims 1 to 3.

6. A groove portion is formed on the outer peripheral surface of the upper part of the sleeve, extending in the circumferential direction of the sleeve, to enable excision of an unnecessary portion that projects upward from the floor slab after the concrete of the floor slab has hardened. The void pipe with a water-stop function according to any one of Claims 1 to 3.

7. A water-stop structure in which, after the sleeve of the void pipe with a water-stop function is embedded in a pipe insertion portion of a floor slab to form a through-hole for inserting a pipe, as the pipe is inserted into the through-hole, the water-stop body provided in the sleeve closes the gap between the pipe and the sleeve in a watertight manner by closely contacting the outer peripheral surface of the pipe.

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