Piping construction

Abstract

To provide a piping structure that can achieve proper watertightness by using a sealing material to seal the circumferential surface between the sheath pipe and the pipe body. [Solution] The system comprises a conduit pipe 30 that penetrates the foundation concrete 1 from the indoor side to the outdoor side, a drain pipe 39 as a pipe body inserted into the conduit pipe 30, and a packing 36 as an annular sealing material that seals the space between the circumferential surfaces of the conduit pipe 30 and the drain pipe 39. The conduit pipe 30 is composed of at least a resin main pipe section 31 and an outer socket 33 as the outdoor end connected to the main pipe section 31. The packing 36 is positioned between a first groove section 51, which is the outer circumferential surface of the outdoor socket 35 of the drain pipe 39, and a sealing surface 48a, which is the inner circumferential surface of the outer socket 33.

Description

Technical Field

[0001] The present invention relates to a piping structure including a sheath pipe buried in a foundation and penetrating from the indoor side to the outdoor side of the foundation, and a pipe body inserted into the sheath pipe.

Background Art

[0002] Conventionally, as this type of piping structure, for example, there has been proposed a structure including a sheath pipe buried in a foundation and penetrating from the indoor side to the outdoor side of the foundation, and a pipe body inserted into the sheath pipe. A drain pipe extending from a building's drainage facility or the like is connected to the indoor-side end of the pipe body, and the outdoor-side end of the pipe body is connected to a drainage channel such as a sewage sump buried underground (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003] [[ID=二十一]] [[ID=二十二]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=三十四]] In the piping structure described in Patent Document 1 above, in order to prevent drainage from flowing backward from the outdoor side to the indoor side of the foundation, an annular sealing material needs to be provided between the inner peripheral surface of the downstream end of the sheath pipe and the outer peripheral surface of the downstream end of the pipe body.

[0005] Since the sheath pipe is often manufactured by blow molding or the like using a resin material in order to penetrate the indoor and outdoor sides of the foundation with a high degree of freedom, the outer diameter dimensions of the sheath pipe can be formed with high precision, while the inner diameter dimensions of the sheath pipe may vary. In addition, there is a problem that the shape of the final inner peripheral surface of the sheath pipe is not stable under the fluid pressure of fresh concrete during foundation formation. When a sealing material is arranged on such an inner peripheral surface of the sheath pipe, the radial gap dimension between the sheath pipe and the pipe body is not stable, and there is a risk that proper water-stopping performance cannot be obtained by the sealing material.

[0006] This invention was made in view of these problems, and aims to provide a piping structure that can achieve proper watertightness by using a sealing material to seal the circumferential surface between the sheath pipe and the pipe body. [Means for solving the problem]

[0007] To solve the above problems, the piping structure described in claim 1 of the present invention is: A piping structure comprising a conduit pipe penetrating from the indoor side to the outdoor side of the foundation, a pipe body inserted into the conduit pipe, and an annular sealing material that seals the circumferential surface between the conduit pipe and the pipe body, The sheath pipe is composed of at least a resin main pipe section and an outdoor end section connected to the main pipe section, and the sealing material is characterized in that it is positioned between the outer surface of the pipe body and the inner surface of the outdoor end section. This feature allows the smooth inner surface of the outdoor end of the conduit pipe to be used as a sealing surface, thereby enhancing the watertight seal between the conduit pipe and the main pipe body.

[0008] The aforementioned outdoor end is characterized by having an annular, thicker walled portion than the main pipe section. According to this feature, the structural strength of the annular thickened portion at the outdoor end is high, making it less prone to deformation during foundation formation.

[0009] The annular thickened portion is characterized in that it is formed in the receiving portion of the outdoor end. This feature allows for increased structural strength at the outdoor end and enables the formation of a receiving-type structure.

[0010] The main pipe section is characterized by having an insertion portion that is fitted into the receiving portion at the outdoor end. This feature allows the insertion end of the resin main pipe, which is manufactured with high precision in its outer diameter, to be properly fitted into the receiving end at the outdoor end.

[0011] The device is characterized by having a locking mechanism that restricts the movement of the sheath pipe and the pipe body relative to each other in the axial direction when the sealing material is positioned between the inner circumferential surface of the outdoor end and the outer circumferential surface of the pipe body. According to this feature, even if an axial force is accidentally applied to the pipe during construction such as piping work, the locking mechanism prevents misalignment between the outer ends of the sheath pipe and the pipe body, thus maintaining a high level of watertightness without shifting the position of the sealing material.

[0012] The sealing material is characterized by being positioned inward in the axial direction of the pipe compared to the locking means. This feature ensures stable watertightness through a sealing material positioned on the inside in the axial direction of the pipe, without interference from the locking mechanism.

[0013] The locking mechanism is characterized by having a locking mechanism provided between the inner circumference of the sheath tube and the outer circumference of the pipe body. This feature allows the locking mechanism to be installed so that it does not protrude significantly outward from the conduit.

[0014] The locking means is characterized by being locked into a recess on the inner circumference of the sheath tube and a recess on the outer circumference of the pipe body. This feature prevents misalignment of the ends because the ends are locked into recesses in both the sheath tube and the tube body.

[0015] The sealing material is characterized by being curved such that its central portion in the axial direction of the pipe protrudes outward. This feature allows the outer surface of the sealing material to be curved so that it slopes downward from the center in the direction of the pipe axis towards both ends, thereby facilitating movement in the direction of the pipe axis while maintaining sealing performance. [Brief explanation of the drawing]

[0016] [Figure 1]It is a cross-sectional view showing a state where the piping structure as an embodiment of the present invention is applied to the foundation concrete. [Figure 2] (a) is a perspective view showing a sheath pipe, and (b) is a cross-sectional view showing an outdoor side end portion of the sheath pipe. [Figure 3] (a) is a perspective view showing a drain pipe, and (b) is a cross-sectional view showing an outdoor side end portion of the drain pipe. [Figure 4] It is an exploded perspective view showing an outdoor socket, a packing, and an outer socket. [Figure 5] It is an enlarged cross-sectional view showing an outdoor side end portion of the sheath pipe. [Figure 6] It is an enlarged cross-sectional view showing an outdoor socket. [Figure 7] It is an enlarged cross-sectional view showing a packing. [Figure 8] (a) is a perspective view showing a lock ring, (b) is a plan view, (c) is an upper left side view, and (d) is a view showing one end portion. [Figure 9] (a) is a plan view showing a wedge member, (b) is a left side view, (c) is a front view, (d) is a right side view, (e) is a bottom view, and (f) is an A-A cross-sectional view of (e). [Figure 10] It is a cross-sectional view showing a state where a drain pipe is inserted into a sheath pipe. [Figure 11] It is a cross-sectional view showing a state where the outdoor side end portion of the drain pipe approaches the outdoor side end portion of the sheath pipe. [Figure 12] (a) is a cross-sectional view showing the relationship between the lock ring in a natural state and the outdoor socket, and (b) is a cross-sectional view showing a state where the outdoor socket enters the outer socket. [Figure 13] (a) is a cross-sectional view showing the relationship between the lock ring in a reduced diameter state and the outdoor socket, and (b) is a cross-sectional view showing a state where the lock ring enters between the outdoor socket and the outer socket. [Figure 14] (a) is a cross-sectional view showing the relationship between the lock ring that has returned to the natural state and the outdoor socket, and (b) is a cross-sectional view showing a locked state where the lock ring is locked in a recess between the outdoor socket and the outer socket. [Figure 15]This is a cross-sectional view showing the outdoor end of the conduit pipe with a wedge member inserted between a pair of extensions of the lock ring. [Figure 16] (a) is a plan view showing the wedge member inserted into the lock ring, and (b) is a cross-sectional view of BB in (a). [Figure 17] (a) is a cross-sectional view of CC in Figure 16(a), (b) is a cross-sectional view of DD in Figure 16(a), and (c) is a cross-sectional view of EE in Figure 16(a). [Modes for carrying out the invention]

[0017] Embodiments for implementing the piping structure of the present invention will be described below based on examples. [Examples]

[0018] An embodiment of the present invention, specifically a piping structure, will be described with reference to Figures 1 to 17. In the following description, the left side of Figure 1 will be considered the downstream side of the piping structure, and the right side of Figure 1 will be considered the upstream side of the piping structure. Furthermore, the front side of Figure 1 will be considered the front of the piping structure, the back side the rear, the left side the left, and the right side the right.

[0019] [Piping structure configuration] As shown in Figure 1, the piping structure 10 as an embodiment of the present invention is applied to the foundation concrete 1 (foundation) as the underfloor structure of a building 4 such as a house. The piping structure 10 consists of a piping device that connects drainage facilities (not shown) such as sinks, washbasins, bathrooms, and toilets located indoors with drainage manholes (not shown) located outdoors, and allows drainage from the drainage facilities to be discharged outdoors. In the following, the indoor side where the drainage facilities are located will be referred to as the upstream side of the piping structure 10, and the outdoor side will be referred to as the downstream side of the piping structure 10.

[0020] The foundation concrete 1 (foundation) is mainly composed of reinforcement and concrete, and is a so-called raft foundation consisting of a base concrete section 2 (floor slab) provided in the ground G, and a rising section 3 erected around the periphery of the base concrete section 2. Multiple reinforcing bars (not shown) are arranged to intersect vertically and horizontally inside the base concrete section 2 and the rising section 3. The lower part of the base concrete section 2 is embedded inside the ground G. The rising section 3 is provided in a frame shape around the periphery of the base concrete section 2 in a plan view.

[0021] The piping structure 10 mainly comprises a conduit pipe 30 that penetrates the concrete base section 2 from the indoor side to the outdoor side, a drain pipe 39 as a pipe body inserted into the conduit pipe 30, a packing 36 provided radially between the outer socket 33 constituting the conduit pipe 30 and the outdoor side socket 35 constituting the drain pipe 39, and a lock ring 37 and a wedge member 38 that restrict the movement of the conduit pipe 30 and the drain pipe 39 in the pipe axis direction.

[0022] [Sheath pipe] As shown in Figure 2(a), the conduit pipe 30 mainly consists of a main pipe section 31 made of a cylindrical pipe member of polyvinyl chloride resin and an outer socket 33 which serves as the outdoor end connected to the main pipe section 31. The main pipe section 31 is formed by blow molding and is a bent pipe consisting of a straight pipe section 41 extending linearly on the indoor side, a straight pipe section 42 extending linearly on the outdoor side, and a curved section 43 that forms a curved shape between the straight pipe sections 41 and 42. In this embodiment, the main pipe section 31 is formed by blow molding, but it may be formed by a method other than blow molding.

[0023] As shown in Figures 1 and 2, the opening 44 at the indoor end of the main pipe section 31 is inclined with respect to the pipe axis and opens approximately parallel to the upper surface 2a of the base concrete section 2, slightly above the upper surface 2a. The opening 45 at the downstream end is approximately perpendicular to the pipe axis and opens into the side surface 2b of the base concrete section 2. In this way, the main pipe section 31 is installed penetrating the base concrete section 2 from the indoor side to the outdoor side.

[0024] Furthermore, the shape of the main pipe section 31 is arbitrary and does not have to be a bent pipe as described above; it may be made up of a straight pipe or the like. Also, the material is arbitrary and does not have to be the polyvinyl chloride resin described above; other synthetic resins may be used.

[0025] As shown in Figures 2(b) and 4, the outer socket 33 is formed by injection molding as a cylindrical pipe fitting made of polyvinyl chloride resin. In this embodiment, the outer socket 33 is formed by injection molding, but it may be formed by methods other than injection molding.

[0026] An opening 46 is formed on the inner circumferential surface of the outer socket 33 into which the insertion opening 31a of the main pipe section 31 can be inserted, and the outer socket 33 is integrally fixed to the outdoor end of the main pipe section 31 inserted into the opening 46 via adhesive. In other words, the outer socket 33 constitutes a part of the sheath pipe of the present invention. Furthermore, on the inner circumferential surface of the outer socket 33, a groove 47 capable of accommodating a lock ring 37 is formed in an annular shape over the circumferential direction on the downstream side of the opening 46, and radial end faces 47a, 47a are formed on both sides of the groove 47 in the direction of the pipe axis.

[0027] Furthermore, the material of the outer socket 33 is arbitrary and does not have to be the polyvinyl chloride resin mentioned above; it may be other synthetic resins, or materials other than synthetic resins such as metal or concrete. Also, in this embodiment, the outer socket 33 is integrally fixed to the outdoor end of the main pipe section 31 via adhesive, but it may be integrally connected to the main pipe section 31 by other methods such as screw connections. In addition, the opening 45 at the downstream end of the sheath pipe 30 is not the opening at the downstream end of the main pipe section 31, but rather the opening at the downstream end of the outer socket 33 which is integrally attached to the downstream end of the main pipe section 31. However, if there is no outer socket 33, the opening at the downstream end of the main pipe section 31 is the opening 45 at the downstream end of the outer socket 33.

[0028] Also, as shown in FIG. 5, a seal portion 48 that protrudes toward the inner diameter side is formed between the receiving port 46 and the concave groove portion 47 of the outer socket 33. A flat seal surface 48a parallel to the pipe axis of the outer socket 33 is formed on the inner peripheral surface of the seal portion 48. An inclined surface 48b that inclines in the outer diameter direction toward the upstream side is formed on the upstream side of the seal surface 48a, and an inclined surface 48c that inclines in the outer diameter direction toward the downstream side is formed on the downstream side of the seal surface 48a. Further, both sides of the seal portion 48 in the pipe axis direction are formed in a crank shape, and annular thick portions 49a and 49b that are thicker than other portions are formed in the portions that extend in the radial direction. That is, the annular thick portion 49a is formed in the crank-shaped portion that constitutes a part of the receiving port 46.

[0029] The wall thickness dimension L12 of the outer socket 33 other than the annular thick portions 49a and 49b is larger than the wall thickness dimension L11 of the main pipe portion 31 (L12 > L11). Further, the wall thickness dimensions L13 and L14 of the annular thick portions 49a and 49b are larger than the wall thickness dimension L12 of the outer socket 33 other than the annular thick portions 49a and 49b, and the wall thickness dimension L13 of the annular thick portion 49a is slightly larger than the wall thickness dimension L14 of the annular thick portion 49b (L11 < L12 < L'14 < L13). Thus, by forming the annular thick portions 49a and 49b on both sides of the seal portion 48 in the pipe axis direction, the structural strength of the outer socket 33 is increased and it is difficult to deform. In the present embodiment, the inner diameter dimension of the seal portion 48 is slightly smaller than the inner diameter dimension of the main pipe portion 31, but the inner diameter dimension of the seal portion 48 may be larger than the inner diameter dimension of the main pipe portion 31, or may be substantially the same as the inner diameter dimension of the main pipe portion 31.

[0030] [Drain pipe] As shown in Figure 3(a), the drain pipe 39 as a tubular body mainly consists of a main drain pipe section 32 made of a flexible circular pipe member made of polyvinyl chloride resin or other synthetic resin, and an indoor socket 34 and an outdoor socket 35 connected to both ends of the main drain pipe section 32 in the axial direction. The indoor socket 34 is connected to an indoor drain pipe 21 that is connected to an indoor drainage system, and the outdoor socket 35 is connected to an outdoor drain pipe 22 that is connected to an outdoor drain manhole. As shown in Figure 1, the indoor socket 34 has an insertion opening 34a that can be inserted into the indoor end of the main drain pipe section 32 and a receiving opening 34b that can receive the downstream end of the indoor drain pipe 21.

[0031] As shown in Figures 3(b) and 4, the outdoor socket 35 is formed by injection molding as a cylindrical pipe fitting made of polyvinyl chloride resin or other synthetic resin. In this embodiment, the outdoor socket 35 is formed by injection molding, but it may be formed by methods other than injection molding. The outdoor socket 35 has an insertion opening 35a that can be inserted into the outdoor end of the main drain pipe section 32, and a receiving opening 35b that can receive the upstream end of the outdoor drain pipe 22 (see Figure 1).

[0032] As shown in Figure 6, a first groove 51 is formed in an annular shape circumferentially on the outer circumferential surface of the outdoor socket 35, where a packing 36 serving as a sealing material is positioned. Downstream of the first groove 51, a second groove 52 capable of accommodating a lock ring 37 is formed in an annular shape circumferentially, and radial end faces 52a, 52a are formed on both sides of the second groove 52 in the direction of the pipe axis. The length of the second groove 52 in the direction of the pipe axis is approximately the same as the length of the groove 47 of the outer socket 33 in the direction of the pipe axis (see Figure 14(b)).

[0033] As shown in Figure 7, the packing 36 is made of ethylene propylene diene rubber and is formed in a substantially annular shape, and is fitted around the outer circumference of the first groove 51. In its natural state, the outer surface of the packing 36 has a curved surface 36a which protrudes most towards the outer diameter at the center in the direction of the pipe axis, and which slopes inward from the center in the direction of the pipe axis toward both sides toward the inner diameter.

[0034] The inner circumferential surface of the packing 36 is provided with a first protrusion 36b, which is approximately semicircular in cross-section and protrudes toward the inner diameter from the central position in the pipe axis direction, and second protrusions 36c and 36d, which are approximately trapezoidal in cross-section and protrude toward the inner diameter from both sides of the first protrusion 36b in the pipe axis direction.

[0035] [Lock ring] As shown in Figures 3(b) and 8(a), the lock ring 37 is formed in a roughly C-shape facing upward in a view along the pipe axis by cutting out a portion of the circumferential direction of an annular member made of synthetic resin, and is configured to be elastically deformable. Specifically, it comprises a locking portion 55 formed in a roughly C-shape facing upward in a view along the pipe axis and accommodating the groove portion 47 of the outer socket 33 and the second groove portion 52 of the outdoor side socket 35; a projection portion 56 protruding from approximately the center in the radial direction of the downstream end face of the locking portion 55 and extending in the circumferential direction; and extension portions 57, 57 extending in the pipe axis direction toward the outdoor side from both ends of the projection portion 56. The material of the lock ring 37 is arbitrary and does not have to be synthetic resin; it may be other flexible material such as metal.

[0036] As shown in Figure 8(d), the inner circumferential surface 55a of the locking portion 55 is configured as a flat surface substantially parallel to the pipe axis direction, while the outer circumferential surface 55b of the locking portion 55 is configured as an inclined surface that slopes inward toward the inner diameter towards the upstream side. This makes it easier to insert the locking portion from the downstream side between the inner circumferential surface of the outer socket 33 and the outer circumferential surface of the outdoor socket 35, as will be described later.

[0037] As shown in FIGS. 8(a) and 8(b), a plurality of concave portions 55c are formed at a plurality of locations in the circumferential direction on the outer peripheral surface 55b of the locking portion 55, and while ensuring the radial dimension from the inner peripheral surface 55a to the outer peripheral surface 55b, it is lightweight. Further, as shown in FIGS. 8(b) to 8(d), the end surfaces 55d, 55d of the locking portion 55 are formed in a substantially V shape in plan view, and the separation dimension of the end surfaces 55d, 55d is smaller than the separation dimension L20 of the inner side surfaces 57b, 57b of the extending portions 57, 57. Further, on the end surfaces 55d, 55d, mounting surfaces 55e, 55e on which the upstream end portions of the wedge members 38 are placed are protruding. The mounting surfaces 55e, 55e extend in the pipe axis direction and are inclined downward toward the downstream side.

[0038] As shown in FIG. 8(d), the outer peripheral surfaces 57a, 57a of the extending portions 57, 57 are arranged slightly above the mounting surfaces 55e, 55e. Further, as shown in FIG. 8(b), the inner side surfaces 57b, 57b of the extending portions 57, 57 are arranged substantially parallel to the pipe axis respectively.

[0039] As shown in FIGS. 8(a) and 8(b), in the vicinity of the extending portions 57, 57 in the projecting piece portion 56, openings 59, 59 that are substantially rectangular in plan view and penetrate in the radial direction are formed along the locking portion 55. The openings 59, 59 constitute the display portion of the present invention described later. Note that the display portion of the present invention does not necessarily have to be an opening of a through hole, and for example, it may be an opening of a recess formed in the projecting piece portion 56. Further, the display portion only needs to be configured to be visible to the user. For example, a sticker with the display portion printed thereon may be attached to the outer peripheral surface of the projecting piece portion 56, or the display portion may be directly engraved on the outer peripheral surface of the projecting piece portion 56.

[0040] In the natural state shown in FIGS. 3(b) and 8(a) and 8(b), the inner diameter dimension L2a of the locking portion 55 is smaller than the outer diameter dimension L1 of the outdoor socket 35 and larger than the outer diameter dimension L3 of the second concave groove portion 52 (L3 < L2a < L1). Note that the outer diameter dimension L2b of the locking portion 55 is larger than the inner diameter dimension L4 (see FIG. 2(b)) of the outer socket 33 (L2b > L4).

[0041] Therefore, when attaching the lock ring 37 to the outer circumference of the outdoor socket 35, although not specifically shown in the figures, the extended portions 57, 57 of the lock ring 37 are directed upward, and the extended portions 57, 57 are elastically deformed to separate them from each other, thereby expanding the diameter and allowing the lock ring 37 to be inserted into the outer circumference of the outdoor socket 35 from the downstream side.

[0042] Furthermore, after insertion, when the locking portion 55 is positioned in the second groove portion 52, the extension portion 57, 57 is released from its expanded state by elastic force, causing the lock ring 37 to return from its expanded state to its natural state, and the inner circumferential surface 55a of the locking portion 55 to enter the second groove portion 52. As a result, both sides of the locking portion 55 in the direction of the pipe axis are locked to the radial end faces 52a, 52a located on both sides of the second groove portion 52 in the direction of the pipe axis, resulting in a locked state in which movement in the direction of the pipe axis is restricted. In this locked state, a gap S is formed between the inner circumferential surface 55a of the locking portion 55 and the outer circumferential surface of the second groove portion 52.

[0043] For the sake of explanation, in Figures 3 and 10 to 12, the lock ring 37 is shown with its central axis concentric with the pipe axis of the drain pipe 39. However, in reality, the lock ring 37 descends under its own weight and hangs from the outdoor socket 35 of the drain pipe 39. Therefore, the locking portion 55 only fits into the second groove portion 52 on the upper side of the outdoor socket 35.

[0044] [Wedge member] As shown in Figures 3(a) and 3(b), the wedge member 38 is inserted from the outside side between the pair of extended portions 57, 57 of the lock ring 37 in the circumferential direction, thereby restricting the reduction in diameter of the lock ring 37 and preventing the restriction (locking) of the relative movement of the drain pipe 39 in the pipe axis direction relative to the main pipe portion 31 from being released.

[0045] As shown in Figures 9(a) to (f), the wedge member 38 is mainly composed of a first plate-like portion 81 which is roughly rectangular in plan view and a second plate-like portion 82 which is roughly trapezoidal in plan view. A plate-shaped handle piece 83 extending in the front-rear direction is provided projecting from the lower surface of the first plate-like portion 81 along the left side. Also, plate-shaped restricting pieces 84, 84 extending in the left-right direction are provided projecting from the lower surface of the first plate-like portion 81 along the front-rear sides. The restricting pieces 84, 84 are positioned slightly inward from the front-rear sides of the first plate-like portion 81, and the distance L21 between the front-rear surfaces is slightly smaller than the distance L20 between the inner surfaces 57b, 57b of the extended portions 57, 57. The vertical dimension of the handle piece 83 is larger than the vertical dimension of the restricting piece 84.

[0046] Support pieces 85, 85 are provided projecting from the front and rear inclined edges of the second plate-like portion 82, extending to the right so as to gradually approach each other. The support pieces 85, 85 are connected from the right end of the restricting pieces 84, 84.

[0047] The upper surfaces of the first plate-like portion 81 and the second plate-like portion 82 are formed in a curved shape that follows the circumferential direction of the lock ring 37. In addition, horizontal surfaces 81a, 81a are formed on the outer side of the restricting pieces 84, 84 on the lower surface of the first plate-like portion 81.

[0048] As shown in Figures 16 and 17, when the wedge member 38 configured in this way is inserted from the outside between a pair of extensions 57, 57, the horizontal surfaces 81a, 81a of the first plate-like portion 81 are placed on the outer circumferential surfaces 57a, 57a of the extensions 57, 57 of the lock ring 37, and the support pieces 85, 85 of the second plate-like portion 82 are positioned on the mounting surfaces 55e, 55e of the lock ring 37, thereby holding it between the pair of extensions 57, 57.

[0049] [Construction methods for piping structures] Next, the construction method for the piping structure will be explained based on Figures 10 to 17.

[0050] First, as shown in Figure 10, before pouring the foundation concrete 1 (foundation) into the ground G, the main pipe section 31 is positioned such that the opening 44 at the indoor end of the main pipe section 31 opens slightly above the upper surface 2a of the base concrete section 2, and the opening 45 at the downstream end opens on the side surface 2b of the base concrete section 2. Then, a portion of the outdoor ground G is excavated, and the foundation concrete 1 (foundation) is poured. As a result, the main pipe section 31 is installed penetrating the base concrete section 2 from the indoor side to the outdoor side.

[0051] Next, as shown by the white arrow in Figure 10, the upstream end of the drain pipe 39 is inserted into the opening 45 at the downstream end of the main pipe section 31, which opens to the outside, and pushed inwards toward the indoor side. Because the drain pipe 39 is flexible, it is inserted while bending appropriately at curved sections 43 and other points in the main pipe section 31.

[0052] As shown in Figure 11, when the outdoor socket 35 attached to the downstream end of the main drain pipe section 32 approaches the outer socket 33 attached to the downstream end of the main pipe section 31, after confirming that the extended portions 57, 57 of the lock ring 37 are in the upper position, the drain pipe 39 is pushed in.

[0053] Next, as shown in Figure 12(b), when the outdoor socket 35 reaches the outer socket 33, the packing 36 passes through the groove 47 of the outer socket 33 and enters the sealing portion 48. At this time, the curved surface 36a of the packing 36 contacts the inclined surface 48c on the inner circumference of the outer socket 33. However, because it is inclined toward the inner diameter from the center in the direction of the pipe axis toward the upstream side, it is guided toward the inner diameter by the inclined surface 48c, thereby improving sealing performance and being smoothly inserted into the main pipe portion 31 (see Figure 13(b)).

[0054] Furthermore, the length of the packing 36 in the axial direction of the pipe is greater than the length of the groove 47 of the outer socket 33 in the axial direction, which prevents the packing 36 from getting stuck in the groove 47 and obstructing insertion when passing through the groove 47 of the outer socket 33.

[0055] Furthermore, as shown in Figures 12(a) and (b), the lock ring 37 is in its natural state before being inserted into the outer socket 33. In this natural state, the inner diameter L2a of the locking portion 55 is slightly larger than the outer diameter L3 of the second groove portion 52 of the outdoor socket 35 (L2a > L3), thus forming a gap S between the locking portion 55 and the outdoor socket 35. Also, the outer diameter L2b of the locking portion 55 is larger than the inner diameter L4 of the outer socket 33 (L2b > L4).

[0056] When the lock ring 37 is inserted into the outer socket 33, as shown in Figures 13(a) and (b), the outer circumferential surface 55b contacts the opening edge 33f of the outer socket 33. The outer circumferential surface 55b of the locking portion 55 of the lock ring 37 is an inclined surface that slopes inward toward the upstream side. As the lock ring 37 moves upstream, it is guided inward toward the opening edge 33f, and as shown by the black arrows, it elastically deforms and changes to a reduced diameter state so that they come closer together. The inner diameter dimension L2a of the locking portion 55 then shrinks to approximately the same size as the outer diameter dimension L3 of the second groove portion 52 of the outdoor socket 35 (L2a=L3), the inner circumferential surface 55a contacts the outer circumference of the second groove portion 52, and the outer diameter dimension L2b of the locking portion 55 shrinks to become slightly smaller than the inner diameter dimension L4 of the outer socket 33 (L2b <L4)。

[0057] This allows the locking portion 55 to pass between the inner circumference of the outer socket 33 and the outer circumference of the outdoor socket 35. Furthermore, the outer surface 55b of the locking portion 55 is an inclined surface that slopes inward toward the inner diameter toward the upstream side, allowing the locking portion 55 to smoothly enter toward the upstream side.

[0058] Next, as shown in Figures 14(a), (b) and 15, the opening at the outdoor end of the outdoor socket 35 becomes substantially flush with the opening 45 of the main pipe section 31, and a part of the projection 56 and extensions 57, 57 of the lock ring 37 protrude outwards. When the opening 59, which serves as an indicator and is formed near the locking portion 55 on the projection 56, enters the interior of the outer socket 33 from the opening 45, the insertion of the drain pipe 39 is stopped. In this way, by using the opening 59, which serves as an indicator and is provided on the projection 56, as an indicator for stopping insertion, the drain pipe 39 can be stopped at the correct position. The locking portion 55 of the lock ring 37 is housed in the groove 47 of the outer socket 33 and the second groove 52 of the outdoor socket 35.

[0059] Here, by releasing the proximity of the extended portions 57, 57 of the lock ring 37, the lock ring 37 expands from its contracted state due to elastic force and returns to its natural state, causing the inner circumferential surface 55a of the locking portion 55 to enter the second groove portion 52 and the outer circumferential surface 55b to enter the groove portion 47.

[0060] Furthermore, as the outer circumferential surface of the enlarged projection 56 is pressed against the inner circumferential surface of the outer socket 33 over the circumferential direction, the lock ring 37 is held in a position concentric with the outdoor socket 35, and a gap S is formed over the circumferential direction between the inner circumferential surface 55a of the locking portion 55 and the outer circumferential surface of the second groove portion 52. As a result, both sides of the locking portion 55 in the pipe axis direction are locked to the radial end faces 52a, 52a on both sides of the second groove portion 52 in the pipe axis direction and the radial end faces 47a, 47a on both sides of the groove portion 47 in the pipe axis direction, thereby restricting (locking) the relative movement of the drain pipe 39 in the pipe axis direction with respect to the main pipe portion 31.

[0061] By restricting (locking) relative movement, the outdoor end of the drain pipe 39 and the outdoor end of the conduit pipe 30 can be easily positioned at approximately the same position in the direction of the pipe axis. This prevents misalignment of the outdoor ends of the conduit pipe 30 and the drain pipe 39 in the direction of the pipe axis, such as the outdoor end of the drain pipe 39 accidentally going too far inward beyond the outdoor end of the conduit pipe 30, or the drain pipe 39 being pushed outward and protruding from the opening 45 when connecting to the indoor drain pipe 21. As a result, the drain pipe 39 can be positioned correctly relative to the conduit pipe 30.

[0062] Furthermore, since a packing 36 is provided in a sealed state between the sealing surface 48a on the inner circumference of the outer socket 33 and the first groove portion 51 on the outer circumference of the outdoor socket 35, rainwater, soil, insects, etc. are prevented from entering the space between the outer socket 33 and the main pipe portion 31 and the outdoor socket 35 and the drain main pipe portion 32 through the opening 45 at the outdoor end. This prevents rainwater from entering the indoor side from the outdoor side due to flooding and accumulating in the foundation concrete 1.

[0063] In particular, since the smooth sealing surface 48a of the outer socket 33, which is formed by injection molding as the outdoor end, can be used instead of the main pipe section 31 formed by blow molding, the watertight sealing effect between the sheath pipe 30 and the drain pipe 39 can be enhanced. In addition, the outer socket 33 is thicker than the main pipe section 31 and has higher structural strength in terms of shape, and the shape of the inner circumferential surface is less likely to deform even when subjected to the fluid pressure of fresh concrete when forming the foundation concrete 1, thus preventing a decrease in the sealing effect of the packing 36.

[0064] Furthermore, since the outer socket 33 has a sealing portion 48 that protrudes toward the inner diameter side, a tubular groove is formed on the outer circumference of the sealing portion 48. When the foundation concrete 1 is formed, the fresh concrete fills into this groove and hardens, preventing the sheath pipe 30 from shifting in the axial direction.

[0065] Furthermore, by restricting (locking) the relative movement of the drain pipe 39 in the pipe axis direction with respect to the sheath pipe 30, it is prevented that the packing 36 will shift in the pipe axis direction and fall out of the opening 45, etc., which would reduce the water-sealing performance. In addition, since the lock ring 37 is positioned on the outdoor side of the packing 36, the packing 36 does not get in the way when positioning or removing the drain pipe 39, so that locking and unlocking with the lock ring 37 can be easily performed.

[0066] Furthermore, when replacing or changing drainage equipment due to building renovations, etc., the lock ring 37 can be easily pulled out of the conduit pipe 30 to the outside by grasping the extended parts 57, 57 that protrude outward from the opening 45, or by gripping the entire outer surface of the projection 56 that also protrudes outward from the opening 45 with both hands from the outer diameter side and pressing inward to reduce the diameter, thereby releasing the lock ring 37. In addition, when installing a new drain pipe 39 inside the conduit pipe 30, the positioning of the drain pipe 39 relative to the conduit pipe 30 can be easily performed simply by locking the lock ring 37.

[0067] Furthermore, with the lock ring 37 inserted into the outer socket 33 to restrict (lock) the relative movement of the drain pipe 39 in the pipe axis direction relative to the sheath pipe 30, as shown in Figures 15 to 17, when the wedge member 38 is inserted from the outside side between the pair of extensions 57, 57, the horizontal surfaces 81a, 81a of the first plate-shaped portion 81 are placed on the outer circumferential surfaces 57a, 57a of the extensions 57, 57 of the lock ring 37, and the support pieces 85, 85 of the second plate-shaped portion 82 are positioned on the mounting surfaces 55e, 55e of the lock ring 37, thereby holding it between the pair of extensions 57, 57.

[0068] By providing a wedge member 38 between a pair of extensions 57, 57, the restricting pieces 84, 84 of the wedge member 38 are positioned between the inner surfaces 57b, 57b of the extensions 57, 57, and the support pieces 85, 85 are positioned between the end faces 55d, 55d of the locking portion 55. This forces the separation dimension L20 of the extensions 57, 57 of the lock ring 37 to be maintained. This prevents the lock ring 37 from unintentionally releasing its restricted (locked) state due to weakening of its elastic recovery force over time due to deterioration, etc., which could cause it to change to a reduced diameter state.

[0069] Furthermore, when the support pieces 85, 85 of the second plate-shaped portion 82 are pushed upstream while placed on the mounting surfaces 55e, 55e of the lock ring 37, the inclination of the mounting surfaces 55e, 55e guides the support pieces 85, 85 gradually toward the outer diameter, causing the upstream end on the upper surface of the first plate-shaped portion 81 to contact the opening periphery 33f of the outer socket 33. As a result, the wedge member 38 is sandwiched radially between the mounting surfaces 55e, 55e and the opening periphery 33f of the outer socket 33, thus preventing the wedge member 38 from dislodging downstream.

[0070] [Effects / Effects] As described above, the piping structure 10 in the embodiment of the present invention comprises a conduit pipe 30 that penetrates from the indoor side to the outdoor side of the foundation concrete 1, a drain pipe 39 as a pipe body inserted into the conduit pipe 30, and a packing 36 as an annular sealing material that seals the space between the circumferential surfaces of the conduit pipe 30 and the drain pipe 39. The conduit pipe 30 is composed of at least a resin main pipe section 31 and an outer socket 33 as an outdoor end connected to the main pipe section 31. The packing 36 is positioned between the first groove section 51, which is the outer circumferential surface of the outdoor socket 35 of the drain pipe 39, and the sealing surface 48a, which is the inner circumferential surface of the outer socket 33.

[0071] According to this, the smooth inner surface of the outer socket 33 that constitutes the sheath pipe 30 can be used as a sealing surface 48a, thereby improving the watertight sealing effect between the sheath pipe 30 and the drain pipe 39.

[0072] Furthermore, since the outer socket 33 has annular thickened sections 49a and 49b that are thicker than the main pipe section 31, the structural strength of the annular thickened sections 49a and 49b of the outer socket 33 is high, making it less prone to deformation during foundation formation.

[0073] Furthermore, the annular thickened portion 49a is formed in the receiving opening 46 of the outer socket 33, thereby increasing the structural strength of the outer socket 33 and allowing it to be formed as a receiving opening structure.

[0074] Furthermore, since the main pipe section 31 has an insertion opening 31a that is fitted into the receiving opening 46 of the outer socket 33, the insertion opening 31a of the resin main pipe section 31, which is manufactured with high precision in terms of outer diameter dimensions, can be properly fitted into the receiving opening 46 of the outer socket 33.

[0075] Furthermore, when the packing 36 is positioned between the inner surface of the outer socket 33 and the outer surface of the outdoor socket 35, the locking ring 37 (locking part), groove 47, and second groove 52 (receiving part) are provided as locking means to restrict the movement of the conduit pipe 30 and the drain pipe 39 in the axial direction of the pipes. This ensures that even if force in the axial direction of the pipes is accidentally applied to the drain pipe 39 during piping work, the locking ring 37 prevents misalignment of the outdoor ends of the conduit pipe 30 and the drain pipe 39 in the axial direction, thereby allowing the drain pipe 39 to be positioned correctly relative to the conduit pipe 30.

[0076] Furthermore, by positioning the packing 36 inward in the pipe axis direction from the locking means, stable watertightness can be ensured by the packing 36 positioned inward in the pipe axis direction without interference from the locking means.

[0077] Furthermore, the locking ring 37, as a locking means, has a locking portion 55 provided between the inner circumference of the conduit pipe 30 and the outer circumference of the drain pipe 39, so that the locking portion 55 does not protrude significantly from the conduit pipe 30 to the outside.

[0078] Furthermore, the locking portion 55, which serves as a locking means, is locked into the recessed groove portion 47, which is a recess on the inner circumference of the sheath pipe 30, and into the second recessed groove portion 52, which is a recess on the outer circumference of the drain pipe 39. In other words, since it is locked into the recesses of both the sheath pipe 30 and the drain pipe 39, misalignment of the ends is prevented.

[0079] Furthermore, the packing 36 is curved so that its central portion in the direction of the pipe axis protrudes outward, and the outer surface of the packing 36 is formed to curve downward from the central portion in the direction of the pipe axis toward both ends, thereby facilitating movement in the direction of the pipe axis while maintaining sealing performance.

[0080] Furthermore, the locking ring 37 (locking portion), groove 47, and second groove 52 (receiving portion) are arranged on the outer socket 33 and outdoor socket 35, which are pipe joints, so as not to get in the way when connecting the outdoor drain pipe 22, and the joint between the drain pipe 39 and the outdoor drain pipe 22 is fixed, so that misalignment in the pipe axis direction between the outdoor ends of the sheath pipe 30 and the drain pipe 39 when connecting the pipes can be effectively prevented.

[0081] Furthermore, the locking ring 37, as a locking mechanism, can be attached to the outdoor end of the outer circumference of the drain pipe 39, and by inserting the drain pipe 39 in the direction of the pipe axis, the locking portion 55 can be locked into the groove portion 47 and the second groove portion 52. In other words, instead of attaching the locking ring 37 after the insertion of the drain pipe 39 is completed, the locking portion 55 can be locked into the groove portion 47 and the second groove portion 52 by the insertion of the drain pipe 39, thus improving work efficiency.

[0082] Furthermore, since the recessed portion 47 (locking portion) on the sheath pipe side and the second recessed portion 52 (locking portion) on the pipe body side are formed in the circumferential direction, the locking portion 55 can be easily locked from the outdoor side of the main pipe 31 without having to worry about its position or orientation.

[0083] Furthermore, the locking portion 55 is formed in an elastically deformable C-shape, allowing it to engage with and disengage from the recesses of both the main pipe 31 and the drain pipe 39 by utilizing the elastic deformation of the locking portion 55. Specifically, by elastically deforming the locking portion 55, the outer diameter L2b can be changed, allowing the locking portion 55 to easily engage with and disengage from the groove portion 47 and the second groove portion 52.

[0084] Furthermore, since extensions 57, 57 extending in the direction of the pipe axis are provided at both ends of the locking portion 55, the locking portion can be easily engaged and disengaged by pinching the extensions 57, 57. Also, because they extend outwards from the locking portion 55, it is easy to visually confirm from the outside whether the drain pipe 39 is positioned by the lock ring 37 based on the degree of protrusion of the projection 56 from the opening 45 and the extensions 57, 57, and it is also easy to visually confirm whether it is properly locked based on the degree of opening of the extensions 57, 57.

[0085] In the above embodiment, when inserting the drain pipe 39, the packing 36 is smoothly inserted into the main pipe section 31 while maintaining its sealing properties due to the inclined surface on the upstream side. However, when removing the drain pipe 39 to the outside, it is smoothly removed from the main pipe section 31 while maintaining its sealing properties due to the inclined surface on the downstream side.

[0086] Although embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the spirit of the present invention are also included.

[0087] For example, in the above embodiment, the outer socket 33 as the outdoor end was exemplified as having a crank shape on both sides in the pipe axis direction of the sealing portion 48 that protrudes toward the inner diameter side, but the present invention is not limited thereto, and the shape is arbitrary, and it may be made of a cylindrical pipe member that does not have a sealing portion 48 that protrudes toward the inner diameter side. Also, although it had a receiving port 46 that is connected to the main pipe portion 31, it may have an insertion port.

[0088] Furthermore, in the above embodiment, the outer socket 33, which serves as the outdoor end, is shown as having a crank shape on both sides in the pipe axial direction of the seal portion 48 that protrudes toward the inner diameter, with annular thickened portions 49a and 49b formed in the radially extending portion. However, the present invention is not limited to this, and the annular thickened portion is not limited to, for example, the crank portion or the receiving opening 46 of the outer socket 33 as described above, but is sufficient as long as an annular thickened portion is formed that protrudes toward at least one of the inner diameter direction and the outer diameter direction. In addition, the outdoor end does not necessarily have to be formed with a thicker wall than the main pipe portion.

[0089] Furthermore, in the above embodiment, the outer circumferential surface of the packing 36 as a sealing material was shown to be in contact with the sealing surface 48a formed on the outer socket 33 as the outdoor end. However, the present invention is not limited to this, and the packing 36 as a sealing material may be in contact with the inner circumferential surface of the main pipe 31 as long as at least a portion (preferably more than half) of it is in contact with the inner circumferential surface of the outer socket 33 as the outdoor end.

[0090] Furthermore, in the above embodiment, the inner circumferential surface of the packing 36 as a sealing material was shown to be in contact with the outer circumferential surface of the first groove 51 of the outdoor side socket 35, which is the outer circumferential surface of the pipe body. However, the present invention is not limited to this, and the packing may be in contact with a portion of the outer circumferential surface of the outdoor side socket 35 other than the first groove 51. Also, since the outer diameter dimension of the main drain pipe section 32 can be formed with high precision, the inner circumferential surface of the packing 36 as a sealing material may be in direct contact with the outer circumferential surface of the main drain pipe section 32 without going through the outdoor side socket 35.

[0091] Furthermore, in the above embodiment, the packing 36 as a sealing material was exemplified as having the cross-sectional shape shown in Figure 7, but the present invention is not limited thereto, and the shape can be arbitrary and can be modified in various ways.

[0092] Furthermore, in the above embodiment, the locking means was exemplified as comprising a locking ring 37 as a locking part and a recessed groove 47 and a second recessed groove 52 as locked parts. However, the present invention is not limited thereto, and any locking means other than a screw structure that can restrict movement in the direction of the pipe axis by rotating the pipe body in the circumferential direction is acceptable. Specifically, it may be a so-called bayonet mechanism consisting of a locking part formed on one of the sheath tube and the pipe body and a locking groove formed on the other, in which movement in the direction of the pipe axis can be restricted by inserting the locking part into the locking groove extending in the direction of the pipe axis and then rotating it slightly in the circumferential direction. Alternatively, it may be a locking means in which movement in the direction of the pipe axis can be restricted by inserting a locking pin from the outer circumference of the sheath tube into a locking hole in the pipe body, or from the inner circumference of the pipe body into a locking hole in the sheath tube.

[0093] Furthermore, in the above embodiment, the locking means was exemplified as comprising a locking portion 55 provided on the lock ring 37 side, a recessed groove portion 47 as a recess on the sheath pipe side, and a second recessed groove portion 52 as a recess on the pipe body side. However, the present invention is not limited thereto, and the locking means may also consist of recessed groove portions formed on the inner circumferential surface 55a and outer circumferential surface 55b of the locking portion 55, and protruding portions formed on the inner circumference of the outer socket 33 and the outer circumference of the outdoor side socket 35 so as to be fitted into the recessed groove portion.

[0094] Furthermore, in the above embodiment, the lock ring 37 is attached to the drain pipe 39 as a pipe body and locks in place by changing to a reduced diameter state when inserted into the main pipe section 31. However, the present invention is not limited to this, and the lock ring 37 may be attached to the inner circumference of the main pipe section 31 and locks in place by changing to an expanded diameter state when the drain pipe 39 is inserted. In addition, the lock ring 37 may be inserted from the outside side and locked in place after positioning the outdoor end of the sheath pipe 30 and the outdoor end of the drain pipe 39.

[0095] Furthermore, although the above embodiment illustrates a configuration in which the locking ring 37 as a locking means is disposed at the outdoor end of the sheath pipe 30 and the drain pipe 39, the present invention is not limited to this, and may be disposed at the indoor end. In other words, it can be disposed at any location in the direction of the pipe axis.

[0096] Furthermore, although the above embodiment illustrates a form in which the locking ring 37 as a locking means is formed in an elastically deformable C-shape, the present invention is not limited thereto and may be formed in an annular shape. Also, it may be composed of a single member that can be placed at predetermined locations in the circumferential direction of the sheath pipe 30 and the drain pipe 39, or it may be composed of a plurality of divided members arranged in the circumferential direction. In addition, the locking portion 55 does not have to extend in the circumferential direction and may be divided into a plurality of parts in the circumferential direction.

[0097] Furthermore, although the above embodiment illustrates a configuration in which the packing 36 as a sealing material is attached upstream of the locking ring 37 as a locking means, the present invention is not limited thereto, and the packing 36 as a sealing material may be attached downstream of the locking ring 37 as a locking means.

[0098] Furthermore, while the above embodiment illustrates a configuration in which a flexible drain pipe 39 is used as the pipe body inserted into the conduit, the present invention is not limited to this, and does not necessarily have to be flexible. Also, the conduit 30 does not necessarily have to have a curved portion 43, etc., and in this way, a pipe body made of a straight pipe member that does not have flexibility can be used. [Explanation of Symbols]

[0099] 1. Foundation concrete (foundation) 2. Base concrete section 3. Vertical section 4 Buildings 10 Piping structure 21 Indoor drain pipe 22 Outdoor drain pipe 30 sheath pipes 31 Main pipe section 31a Socket (Socket part) 32 Main drain pipe section 33 Outer socket (outdoor end) 34 Indoor socket 35 Outdoor socket 36. Packing (sealant) 36a Curved surface 37. Lock ring (locking mechanism) 38 Wedge member 39. Drain pipe (pipe body) 44,45 aperture 46 Socket (Socket part) 47. Recessed section (recess on the sheath pipe side, locking mechanism) 47a Radial end face 48 Seal part 48a Sealing surface 49a, 49b Annular thickened portion 51. First groove section (outer surface of the pipe) 52 Second groove section (recess on the pipe body side, locking mechanism) 52a Radial end face 55 Locking part (locking means) 55a Inner surface 55b Outer surface 56 Projection part 57 Extension section

Claims

1. A piping structure comprising a conduit pipe penetrating from the indoor side to the outdoor side of the foundation, a pipe body inserted into the conduit pipe, and an annular sealing material that seals the circumferential surface between the conduit pipe and the pipe body, The aforementioned sheath pipe is composed of at least a resin main pipe section and an outdoor end section connected to the main pipe section, and the sealing material is arranged between the outer circumferential surface of the pipe body and the inner circumferential surface of the outdoor end section, characterized in that the piping structure is such that the sheath pipe is composed of at least a resin main pipe section and an outdoor end section connected to the main pipe section, and the sealing material is arranged between the outer circumferential surface of the pipe body and the inner circumferential

2. The piping structure according to claim 1, characterized in that the outdoor end portion has an annular wall thickness portion that is thicker than the main pipe portion.

3. The piping structure according to claim 2, characterized in that the annular thickened portion is formed at the receiving end of the outdoor side end.

4. The piping structure according to claim 1, characterized in that the main pipe section has an insertion section that is fitted into the receiving section of the outdoor end.

5. The piping structure according to any one of claims 1 to 4, characterized in that when the sealing material is positioned between the inner circumferential surface of the outdoor end and the outer circumferential surface of the pipe body, it is provided with a locking means for restricting the movement of the sheath pipe and the pipe body relative to each other in the pipe axis direction.

6. The piping structure according to claim 5, characterized in that the sealing material is positioned inward in the pipe axial direction from the locking means.

7. The piping structure according to claim 5, characterized in that the locking means has a locking means provided between the inner circumference of the sheath pipe and the outer circumference of the pipe body.

8. The piping structure according to claim 7, characterized in that the locking means is locked to a recess on the inner circumference of the sheath pipe and a recess on the outer circumference of the pipe.

9. The piping structure according to claim 1, characterized in that the sealing material is curved such that its central portion in the axial direction of the pipe protrudes outward.

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