JP2011158026A - Drainage flexible pipe and connecting part-connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drainage flexible pipe which does not hinder a flow of drainage, and a connecting part-connecting structure which is simple in structure. <P>SOLUTION: In the drainage flexible pipe 1, an inner pipe 3 and an outer pipe 2 are brought into non-contact states when the inner pipe 3 is inserted into the outer pipe 2, an inner protrusion 3A of the inner pipe 3 is made to intrude inside an outer protrusion 2A of the outer pipe 2, and a deformable gap S is set between the inner protrusion 3A and the outer protrusion 2A. Furthermore, an overlapping parts 7 where the pipe end of the outer pipe 2 and the pipe end of the inner pipe 3 are overlapped with each other are formed at both ends of the drainage flexible pipe 1 respectively, and the overlapping part 7 is sandwiched by a sandwiching part 14 which is set at the flexible pipe side end of a connecting part 11, thus connecting the connecting part 11 to the drainage flexible pipe 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drainage flexible pipe used indoors or outdoors, and a connection part connection structure in which a connection part is connected to the drainage flexible pipe.

  For example, Patent Document 1 discloses a double-layer corrugated pipe having a corrugated outer pipe and an inner pipe inserted into the outer pipe. Yes. Since the corrugated pipe has flexibility, for example, a curved pipe can be formed under the floor of a building.

  Patent Document 2 discloses a two-layered pipe rehabilitation pipe applied to a gas pipe. The pipe rehabilitation pipe is a tubular body having an inner / outer double wall of an outer pipe provided with a ridge and an inner pipe provided with a ridge, and the inner pipe and the outer pipe are brought into a non-adhesive state. However, the end of the protrusion of the inner tube is in contact with the inner surface of the protrusion of the outer tube.

JP 2005-233373 A JP 2002-254536 A

  However, in the configuration disclosed in Patent Document 1, since the inner tube is fused (adhered) to the inner side of the outer tube, the inner tube is bent when the drainage flexible tube is bent. In some cases, the inner tube cannot be bent while moving relative to the outer tube, which causes the inner tube to be distorted and buckled. When the inner tube buckles in the outer tube in this way, irregularities are formed on the inner surface of the inner tube, and foreign matter in the drainage flowing through the inner tube adheres to or accumulates on the irregular portions. The smooth flow of the waste water is hindered.

Here, a configuration in which the inner tube and the outer tube are not adhered as disclosed in Patent Document 2 is applied to a flexible pipe for water distribution to prevent the buckling of the inner tube as described above. It is possible. However, in the pipe line disclosed in Patent Document 2, the tip of the ridge of the inner pipe is in contact with (in contact with) the inner peripheral surface of the outer pipe. There is a possibility that the movement or deformation of the strip is limited and the inner tube does not bend properly, and the wall of the inner tube is buckled at the protruding portion, thereby inhibiting the flow of drainage.
In the embodiment disclosed in Patent Document 2, since the outer tube is formed by spirally winding a band material, there is a portion where the band material is superimposed on the tube end of the outer tube. There is a problem that it is exposed and it is difficult to ensure water tightness at the site.
Moreover, since the unevenness | corrugation is formed in the inner surface of an inner pipe, the other Example currently disclosed by patent document 2 will inhibit the flow of waste_water | drain by this unevenness | corrugation.

  Therefore, an object of the present invention is to provide a flexible pipe for drainage that can solve the above problems, and a connection part connection structure that connects a connection part to the flexible pipe for drainage.

  In order to solve the above problems, the present invention is a drainage flexible tube comprising a flexible outer tube and a flexible inner tube inserted into the outer tube, and the outer tube is corrugated. By forming into a shape, an outer ridge that protrudes outwardly on the tube wall of the outer tube is provided along the circumferential direction, and by making the inner tube substantially cylindrical, the inner peripheral surface has a non-concave shape, And an inner ridge projecting outwardly on the outer peripheral surface is formed along the circumferential direction, and when the inner tube is inserted into the outer tube, the inner tube and the outer tube are brought into a non-adhered state; and The inner ridge enters the inside of the outer ridge, and a gap is provided between the tip of the inner ridge and the outer ridge, between the tip of the inner ridge and the outer ridge. The drainage flexible pipe is characterized in that when the deformation allowable gap is set and the inner pipe is curved, the deformation allowable gap allows the deformation of the inner ridge.

In the above invention, the inner tube and the outer tube are not bonded, and the inner tube is movable with respect to the outer tube during bending. Further, the inner ridge of the inner tube is inserted inside the outer ridge of the outer tube to restrict the movement range of the inner ridge to the inner side of the outer ridge, and the inner tube is connected to the outer tube. On the other hand, excessive movement is prevented. Further, a gap is formed between the tip of the inner ridge and the outer ridge to allow deformation of the inner ridge along with the deformation of the tube wall when the inner tube is curved.
Therefore, when the drainage flexible pipe is bent at the time of construction, the inner pipe is suitably bent along the outer pipe without buckling in the outer pipe. It is not formed and the flow of drainage is not hindered.

  Furthermore, a clearance may be provided between the side surface of the inner ridge and the outer ridge, and a deformation allowable gap may be set between the side surface of the inner ridge and the outer ridge.

  With such a configuration, the deformation of the inner ridge can be more preferably allowed by the deformation allowable gap.

  Moreover, it is desirable that a concave groove is formed along the circumferential direction of the inner tube at the tip of the inner ridge.

  In the above configuration, when a compressive stress along the tube axis direction acts on the inner ridge when the inner tube is bent, both side portions of the groove are bent toward each other toward the groove. Become. That is, by providing the concave groove, a clearance area for the deformed portion of the inner ridge is formed, distortion of the entire inner ridge is reduced, and deformation of the inner ridge causes buckling of the inner tube. Can be prevented.

  The present invention also provides a connection part connection structure in which connection parts are connected to both ends of the drainage flexible pipe, respectively, and the pipe ends of the outer pipe are connected to both ends of the drainage flexible pipe. Superposed portions that overlap the pipe ends of the inner pipes are provided, a pinching part is provided at the flexible pipe side end of the connecting part, and the flexible pipe for drainage is provided at the pinching part of the connecting part. In this connection part connecting structure, the connecting parts are respectively connected to both ends of the flexible pipe for drainage by sandwiching the overlapping part.

  In the above configuration, it is possible to connect the connection parts to both ends of the flexible pipe for drainage with a simple structure.

  In addition, it is desirable that the connection part connection structure described above is configured such that the inner pipe of the drainage flexible pipe is made of an elastic material, and the inner pipe is held in a state of being pulled toward both ends of the inner pipe.

  In the above invention, when the inner tube is bent at the time of construction and compressive stress along the tube axis direction acts on a predetermined portion of the inner tube, the inner tube is held in advance in a state of being pulled in both directions. Since the compressive stress at the predetermined portion is reduced or offset and the distortion of the inner tube is relieved, the inner tube is unlikely to buckle.

  Even if the flexible pipe for drainage of the present invention is bent, the inner pipe does not buckle, so that the flow of drainage is not hindered. Moreover, the connection component connection structure of this invention can connect a connection component to this flexible pipe for drainage with a simple structure.

Explanatory drawing which shows the usage condition of the flexible pipe for drainage Longitudinal section of flexible pipe for drainage Longitudinal cross section of curved flexible pipe for drainage a) is an enlarged view of the α portion in FIG. 3, and b) is an enlarged view of the β portion. Expanded cross-sectional view showing other shapes of inner ridges

Embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the flexible pipe 1 for drainage of the present invention is used by being inserted into, for example, a bent sheath pipe 20 embedded in a base (not shown) of a building in a penetrating manner. In such a state of use, connecting parts 11 and 11 (receiving part parts or connecting part parts) as shown in FIG. 2 are connected to the upstream end part and the downstream end part of the flexible pipe 1 for drainage. The drainage flexible pipe 1 and the bent sheath pipe 20 are set so as not to protrude outside the building by a known nut member 21.

  As shown in FIG. 2, the flexible pipe 1 for drainage includes a flexible outer pipe 2 such as a hard vinyl chloride material and a flexible inner pipe made of a rubber material (elastic material) such as SBR. 3.

  The outer tube 2 is formed in a corrugated shape so as to impart flexibility, and an outer protruding line 2A that protrudes outward and extends in the circumferential direction is formed along the tube axis direction on the tube wall of the outer tube 2. A plurality of them are provided intermittently. The molded body constituting the outer tube 2 is manufactured by, for example, blow molding, injection molding, or corrugated extrusion using a known corrugator.

On the other hand, the inner tube 3 inserted into the outer tube 2 is a substantially cylindrical molded body that is molded separately from the outer tube 2, the inner peripheral surface is a non-concave shape, and the outer peripheral surface has A plurality of inner ridges 3A protruding outward and extending in the circumferential direction are provided intermittently along the tube axis direction.
Furthermore, a groove 4 is formed along the circumferential direction of the inner tube 3 at the tip of the inner ridge 3A. As shown in FIG. 2 and the like, the groove depth of the concave groove 4 in the present embodiment is set to be approximately the same as the height of the inner convex strip 3A with respect to the outer peripheral surface of the inner tube 3.

  In a state where the inner tube 3 is inserted into the outer tube 2, the inner tube 3 and the outer tube 2 are not bonded, and the inner tube 3 is bent when the drainage flexible tube 1 is bent. 3 is movable with respect to the outer tube 2. Further, as shown in FIG. 2 and the like, a plurality of inner ridges 3A provided on the inner tube 3 penetrate inside the outer ridges 2A provided on the outer tube 2, and the inner ridges 3A. The moving range of 3A is restricted only inside the outer ridge 2A.

  Further, as shown in FIG. 4, a gap is provided between the periphery of the inner ridge 3A and the outer ridge 2A, and this gap is the deformation allowable gap S of the present invention. Specifically, the deformation allowable gap S in the present embodiment is the first gap S1 set between the tip of the inner ridge 3A and the outer ridge 2A, the side surface of the inner ridge 3A, and the outer ridge 2A. The second gap S2 is set between them.

  Next, the connection component connection structure 10 in which the connection components 11 and 11 are connected to both ends of the drainage flexible tube 1 will be described with reference to FIG.

The connecting component 11 includes an outer cylinder 12 and an inner cylinder 13 that is fitted and fixed to the outer cylinder 12. The outer cylinder 12 and the inner cylinder 13 are made of a hard vinyl chloride material.
Further, a groove portion is formed at the end portion of the connecting part 11 on the side of the draining flexible tube, with the inner peripheral surface of the outer cylinder 12 and the outer peripheral surface of the inner cylinder 13 as groove walls. The clamping part 14 of the invention is configured.
Further, the outer end of the outer tube 2 is provided with a key-shaped outer engaging portion 5, and the inner end of the inner tube 3 is processed to be concavo-convex so as to be engageable with the outer engaging portion 5. An inner engagement portion 6 is provided. Further, the outer peripheral surface of the inner cylinder 13 is provided with a receptacle engaging portion 15 that is concavo-convex processed so as to be engageable with the inner engaging portion 6.

  Then, at the end of the drainage flexible tube 1, the outer engagement portion 5 and the inner engagement portion 6 are engaged to overlap the tube end of the outer tube 2 and the tube end of the inner tube 3. The overlapping portion 7 is set.

In the above configuration, in order to connect the connecting part 11 to the drainage flexible tube 1, the overlapping portion 7 is press-fitted into the sandwiched portion 14 having a groove shape, and the inner engaging portion 6 and the receiving engagement portion 15. So that the overlapping portion 7 is sandwiched by the sandwiching portion 14 and the inner tube 3 is held in a state of being pulled in both directions while being inserted into the outer tube 2. Set.
In such a connection structure 10, the overlapping portion 7 is sandwiched between the sandwiching portions 14, and the outer engaging portion 5, the inner engaging portion 6, and the receiving port engaging portion 15 are engaged with each other. The connecting component 11 is not dropped from the drainage flexible tube 1.

In the configuration described so far, in the state where the drainage flexible tube 1 is not curved, the periphery of the inner ridge 3A of the inner tube 3 and the outer ridge 2A of the outer tube 2 are in a non-contact state.
Then, as shown in FIG. 3, when the drainage flexible tube 1 is bent, the inner tube 3 and the outer tube 2 are not bonded, so the inner tube 3 is bent while appropriately moving in the outer tube 2. . Therefore, the inner tube 3 is not distorted and buckled.
Further, in the compressed portion (see FIG. 4a) and the pulled portion (see FIG. 4b) of the flexible pipe 1 for drainage, the inner ridge 3A is deformed in the outer ridge 2A along with the deformation of the tube wall of the inner tube 3. It deforms according to the curvature. In particular, as shown in FIG. 4a, in the portion where the inner ridge 3A is compressed along the tube axis direction, the ridges 23, 23 on both sides of the groove 4 of the inner ridge 3A are formed in the groove 4. It bends so that it may mutually approach. For this reason, the inner tube 3 is not distorted and buckled at the portion where the inner ridge 3A is formed.
Further, since the inner tube 3 is held in the outer tube 2 in a state of being pulled in both directions in advance, even if a compressive stress along the tube axis direction acts on a predetermined portion of the inner tube 3 during bending. The compressive stress is reduced or offset, and the distortion of the inner tube 3 is relaxed.
Thus, even when the drainage flexible tube 1 is curved during construction, the inner surface of the inner tube 3 is not uneven, and the inner peripheral surface of the inner tube 3 is entirely non-irregular, The flow of drainage flowing through the inner pipe 3 is not hindered.

The present invention is not limited to the above-described embodiments, and appropriate design changes can be made without departing from the gist of the present invention.
For example, as shown in FIG. 5, the groove 4 may not be formed in the inner protrusion 3 </ b> A of the inner tube 3, and can be set to a required dimensional shape as appropriate.
Further, the drainage flexible tube 1 of the present invention only needs to be provided with at least a gap between the tip of the inner ridge 3A and the outer ridge 2A to form a deformation allowable gap S. As long as the deformation of the strip 3A is appropriately allowed, for example, the side surface of the inner convex strip 3A and the inner surface of the outer convex strip 2A may be in contact with each other in whole or in part.
Moreover, you may comprise the outer tube | pipe 2 with other resin materials, such as polyethylene (PE).
The inner tube 3 may be made of an elastic material and may be made of an elastomer or other rubber material.
Moreover, you may make it adhere | attach this superposition | polymerization part 7 in the clamping part 14 of this connection component 11 via an adhesive agent.
Moreover, the outer cylinder 12 and the inner cylinder 13 of the connection component 11 may be configured separately as described above, or may be configured integrally by insert molding or the like.

DESCRIPTION OF SYMBOLS 1 Flexible pipe for drainage 2 Outer tube 2A Outer protruding line 3 Inner tube 3A, 3B Inner protruding line 4 Groove 7 Superposition part 10 Connection part connection structure 11 Connection part 14 Clamping part S Deformation tolerance

Claims (5)

A drainage flexible tube comprising a flexible outer tube and a flexible inner tube inserted into the outer tube,
By forming the outer tube into a corrugated shape, an outer ridge projecting outward is provided along the circumferential direction on the tube wall of the outer tube,
By forming the inner tube into a substantially cylindrical shape, the inner peripheral surface is formed into a non-concave shape, and an inner ridge that protrudes outward on the outer peripheral surface is formed along the circumferential direction.
In a state where the inner tube is inserted into the outer tube, the inner tube and the outer tube are brought into a non-adhered state, and the inner ridge is allowed to enter inside the outer ridge, and further, A gap is provided between the tip and the outer ridge to set a deformation allowable gap between the tip of the inner ridge and the outer ridge. When the inner tube is curved, the deformation allowable gap is A flexible pipe for drainage which allows deformation of the inner ridge.   The flexible pipe for drainage according to claim 1, wherein a gap is provided between a side surface of the inner ridge and the outer ridge so as to set a deformation allowable gap between the side surface of the inner ridge and the outer ridge. .   The flexible pipe for drainage according to claim 1 or 2, wherein a concave groove is formed at a distal end portion of the inner ridge along the circumferential direction of the inner pipe. A connecting part connecting structure in which connecting parts are connected to both ends of the flexible pipe for drainage according to any one of claims 1 to 3,
Provided on both ends of the drainage flexible tube are overlapping portions where the tube end of the outer tube and the tube end of the inner tube are overlapped,
A clamping part is provided at the flexible tube side end of the connection part,
Connection component connection characterized in that connection components are respectively connected to both ends of the drainage flexible tube by clamping the overlapping portion of the drainage flexible tube with the clamping portion of the connection component Construction. The inner pipe of the flexible pipe for drainage is made of an elastic material,
The connection part connection structure according to claim 4, wherein the inner pipe is held in a state of being pulled toward both ends of the inner pipe.