JP5015466B2 - Joint structure of earthquake-resistant flexible pipe - Google Patents

Description

  The present invention relates to a joint structure at a joint portion of each pipeline box (precast box culvert) that constitutes a flexible pipeline having seismic performance applied to pipeline facilities such as water and sewage systems, common grooves, and lock gates. is there.

  Conventionally, a flexible box culvert has been used for this type of earthquake-resistant duct (see, for example, Patent Document 1). This flexible box culvert is an integrally formed box culvert in which a flexible rubber and a steel collar are built in a flexible joint at the center, and has a structure capable of following the deformation of the ground. Flexible box culverts are placed at predetermined locations on the general box culvert, and each box culvert is joined via a packing material and integrated with a PC steel rod to achieve the required seismic performance with the allowable deformation of the flexible part. A pipeline with it is constructed.

  In addition, as prior arts related to the present invention, Patent Documents 2 to 4 disclose a technique in which an elastic joint having a substantially T-shaped cross section is mounted in a gap in an outer peripheral portion at a joint portion of a box culvert.

JP 2005-336710 A JP 2005-290758 A Japanese Patent Laying-Open No. 2005-200832 JP 2004-044189 A

(1) Since the conventional flexible box culvert with earthquake resistance performance integrates the pipe line, it is necessary to tension each box in a column using a PC steel rod, and the work becomes complicated.
(2) It is difficult to secure the required tension in the tension work of PC steel bars.
(3) A formwork modification for producing a flexible member is required.
(4) When the box culverts are joined to each other via the waterstop rubber ring without using the conventional formwork modification and without using the flexible box culvert, the waterstop rubber ring will be It may fall off (peel) from a fixed position and impair the water stop performance / flexibility performance.
(5) The water stop rubber ring located at the corner part is easy to fall off (peel) from the fixed position. As a result, water stopping performance and flexibility performance may be impaired.

  The present invention eliminates the need for the conventional flexible box culvert in the flexible pipe having the required seismic performance, eliminates the need for the PC tension work / inner joint work required in the conventional method, and has a relatively simple joint structure. The present invention provides a joint structure for an earthquake-resistant flexible pipe that can reliably ensure good earthquake resistance and water stoppage performance.

The present invention relates to a joint structure for an earthquake-resistant flexible pipe, and one of the features is that a male joint of a square frame-like protrusion and a square frame-like notch for fitting a pipe box having both ends open to each other. It is a joint structure of earthquake-resistant flexible pipes constructed by joining with female joints, and the outer shape of the rectangular frame-shaped projections of the male joints is a square shape in front view and at each corner part rectangular frame waterproof rubber ring that does not include the curved portion is that you have installed.

  For example, as shown in FIGS. 1 and 2, the present invention is applied to a pipe line formed by cascading normal laying type RC precast box culverts as a pipe box, and has a square frame-shaped projection on one end side. A joint (convex slot) and a rectangular frame-shaped female joint (concave socket) are provided on the other end. This is applied to a box culvert.

  The water stop rubber ring is made of, for example, SBR (styrene butadiene rubber), and is bonded to the tapered outer peripheral surface of the square joint of the male joint with an adhesive. Compressed by the tapered inner peripheral surface to stop water. The shape of the water-stop rubber ring in front view is a square shape with the corner bent at a right angle, and the right-angled corner is in close contact with the corner of the square frame projection of the male joint. Water stop performance and flexibility performance can be obtained.

The invention according to claim 1 of the present invention is capable of earthquake resistance, which is formed by joining a pipe box having both ends opened to each other by a male joint of a square frame-like protrusion and a female joint of a square frame-like notch. A rectangular frame-shaped water stop rubber ring having a flexible pipe joint structure and having a square shape in front view on the outer peripheral surface of the square-frame-like projection of the male joint and no curved portion at each corner. There is mounted on the inner peripheral surface of the rectangular frame-shaped cutout each corner of the female coupling, in front view consisting of ultra low hardness Doe elastomer of the gel materials used in the grips applications and cushions applications It is a joint structure of an earthquake-resistant flexible pipe characterized in that a mountain-shaped pad is bonded as a water-stop auxiliary material for each corner portion in contact with the water-stop rubber ring.

Since the corners of the male and female joints are almost right-angled, the water-stop rubber ring is not compressed sufficiently, so the pad is used as a water-stop aid for the corner. it appears as a prerequisite to use a pad of ultra-low hardness Doe elastomer of the gel material used in APPLICATIONS (special pad). Such special pads are affixed to the inner peripheral surface of each corner of the female joint with adhesive tape or the like. In addition, the water stop effect is further improved.

The invention according to claim 2 of the present invention is a seismic-resistant structure constituted by joining a male box joint with a square frame-like protrusion and a female joint with a square frame-like notch that fit together a duct box having both ends opened. A rectangular frame-shaped water stop rubber ring having a flexible pipe joint structure and having a square shape in front view on the outer peripheral surface of the square-frame-like projection of the male joint and no curved portion at each corner. There is mounted, the entire periphery of the rectangular frame-shaped notch in the peripheral surface of the female coupling, pads waterproofing consisting ultra low hardness Doe elastomer of the gel materials used in the grips applications and cushions applications It is a joint structure of an earthquake-resistant flexible pipe, which is bonded as a water stop auxiliary material in contact with a rubber ring.

  That is, the special pad is not limited to the case where it is disposed only at each corner portion, but is disposed over the entire inner peripheral surface of the rectangular frame-shaped notch of the female joint, and the water stop rubber ring and the special pad are joined to each other. You may make it closely_contact | adhere over the perimeter.

The invention of claim 3 of the present invention, in the joint structure of earthquake resistance flexible pipe according to any one of up to claim 1 or claim 2, the water shut-off lubricant applied to the surface of the water stop rubber ring It is the joint structure of the earthquake-resistant flexible pipe characterized by being characterized.
Further, the invention of claim 4 of the present invention is characterized in that in the joint structure of the earthquake-resistant flexible conduit according to claim 1 or 2 , a waterstop lubricant is applied to the surface of the pad. It is a joint structure of an earthquake-resistant flexible pipe.

  Water stoppage with a water stop rubber ring is basically performed by applying a large compression to the rubber, so it requires a considerable pull-in force during construction, and there is a possibility that it cannot be pulled into a fixed position because there is a special pad. is there. Accordingly, a water-stopping lubricant is applied to the outer surface of the water-stopping rubber ring and / or the inner surface of the special pad so that the box can be easily pulled in and inserted. For this water-stopping lubricant, for example, a hydrophilic polyurethane resin is used. After functioning as a lubricant, it acts as an elastic adhesive by reaction and exhibits a complete water-stopping effect. You may make it apply | coat to the outer peripheral surface of a male type | mold joint, and the inner peripheral surface of a female type | mold joint.

  In the present invention as described above, the water stop rubber ring and the special pad are attached at the factory before shipment, and the water stop lubricant is applied at the construction site. A simple earthquake-resistant flexible conduit is constructed by pulling the conduit box with a lever block or the like and joining the boxes together with a waterproof rubber ring and a special pad.

  According to the present invention, (1) since the water is stopped with only the water-stopping rubber ring, the special pad, and the water-stopping lubricant, the conventional flexible box culvert becomes unnecessary. (2) Similarly, PC tension work and joint joint work that were necessary in the conventional method are no longer required. (3) The water-stop rubber ring has a square shape with its corners bent almost at right angles, so it can provide good water-stop performance and flexibility. (4) Since the special pad exhibits characteristics close to that of the liquid composition, the boundary surface between the water stop rubber ring and the special pad closely adheres to further increase the water stop effect. (5) The special pad exhibits characteristics close to that of the liquid composition and has uniform pressure transmission characteristics, so that the product can be prevented from being damaged due to partial contact of the joint when the pipe is deformed. (6) When pulling in the duct box, the water-stop rubber ring can slide on the surface of the special pad due to the effect of the water-stopping lubricant and the special pad exhibiting characteristics close to that of the liquid composition, and can be easily put in place. it can. The water-stopping lubricant works as a resilient adhesive and exhibits a complete water-stopping effect.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Since the pipe box is a joint structure that joins water-stop rubber rings, special pads, and water-stopping lubricants, without modifying the formwork and using a flexible box culvert as before. In addition, it is possible to construct a simple earthquake-resistant flexible conduit having good seismic performance and water stopping performance without changing the standard dimensions of the national box culvert association type.
(2) Since the conventional expensive flexible box culvert, PC tension work, and joint joint work are not required, it is possible to construct an extremely economical seismic flexible pipe.
(3) Since the earthquake-resistant flexible pipe has flexibility at all joints, the ground is more likely to follow deformation than the conventional method.
(4) Since the PC tension work and the joint work can be omitted, the construction becomes extremely easy.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is an embodiment of a conduit box and its joint structure constituting an earthquake-resistant flexible conduit according to the present invention, and FIG. 2 is an earthquake-resistant flexible conduit in which the conduit boxes of FIG. is there.

  In FIG. 1, a duct box 1 constituting an earthquake-resistant flexible duct is a rectangular box with front ends opened, that is, a normal laying type RC precast box culvert, and has a square frame shape on one end side. A male joint (protruding port) 2 of the protrusion is provided, and a female joint (concave receiving port) 3 having a rectangular frame-shaped notch is provided on the other end side. It is a national box culvert association type.

  In such a pipe box 1, a rectangular frame-shaped water-stopping rubber that has a square shape in front view on the outer peripheral surface 2a of the square-frame-shaped protrusion 2A of the male joint 2 and does not include a curved portion at each corner portion. A special pad 11 having characteristics close to the liquid composition is in contact with the water-stopping rubber ring 10 on the inner peripheral surface 3a of each corner portion of the rectangular frame-shaped notch 3A of the female joint 3 with the ring 10 attached. Adhere as a water stop aid for corners.

  The water stop rubber ring 10 is made of, for example, SBR (styrene butadiene rubber) and has a cross-sectional shape designed based on a proven shape as a pipe joint (see FIG. 1C). It adheres to the attached outer peripheral surface 2a with a two-component epoxy adhesive or the like, and is compressed by the tapered inner peripheral surface 3a of the female joint 3 at the time of joining to stop water. The front-view shape of the water stop rubber ring 10 is a square shape in which a corner portion is bent at a substantially right angle (see FIGS. 1E and 1F). The corner part of the conventional water stop rubber ring is R-shaped, and it is separated from the corner part of the male joint 3 so as to swell outward, and the water stop performance / flexibility may be impaired. The water-stop rubber ring 10 closely adheres to the corner portion of the male joint 3, and good water-stopping performance and flexibility performance can be obtained. The water stop rubber ring 10 joins four straight members at the corners (see FIG. 1E), or joins four straight members to the four corner chevron members (FIG. 1F). Etc.).

  The special pad 11 is used as a water stop auxiliary material for the corner portion because the water stop rubber ring 10 is not sufficiently compressed because the corner portion is substantially right-angled. It is preferred to use a pad, for example a new material, ultra-low hardness elastomer (0HA). This new material is a gel-like substance mainly composed of paraffin oil. It is gel-like from -80 ° C to room temperature, flows according to shear stress at 70 ° C and above, and has properties similar to liquid compositions, especially equal pressure. Excellent transfer characteristics. Such a special pad 11 has a thickness of about 2 mm and is affixed to the inner peripheral surface 3a of each corner portion with butyl tape or the like. A corner-shaped special pad 11 is arranged in the corner portion when viewed from the front, and the inner surface of the special pad 11 comes into contact with the outer surface of the water-stopping rubber ring 10 at the time of joining. It will be further improved.

  In addition, although the case where this special pad 11 was arrange | positioned only in each corner part was shown, it arrange | positions not only to this but over the perimeter of the internal peripheral surface 3a of the square frame-shaped notch 3A of the female joint 3. The water stop rubber ring 10 and the special pad 11 may be in close contact over the entire circumference of the joint.

  In addition, since the water stop by the water stop rubber ring 10 is basically performed by applying a large compression to the rubber, a considerably large pulling force is required at the time of construction, and the special pad 11 is present, so that the water is pulled to a fixed position. There is a fear that it cannot be put. Therefore, a water-stopping lubricant 12 is applied to both the outer surface of the water-stopping rubber ring 10 and the inner surface of the special pad 11 to facilitate the insertion of the box. You may make it apply | coat to the outer peripheral surface 2a of the male coupling 2 and the inner peripheral surface 3a of the female coupling 3 as well. For the waterstop lubricant 12, for example, a hydrophilic polyurethane resin is used. After functioning as a lubricant when joining the box, it works as an elastic adhesive by the reaction and exhibits a complete water-stopping effect.

  The water stop rubber ring 10 and the special pad 11 are attached at the factory before shipment, and the water stop lubricant 12 is applied at the construction site. By pulling the conduit box 1 with a lever block or the like and joining the boxes together via the water stop rubber ring 10 and the special pad 11, an earthquake-resistant flexible conduit 20 is constructed as shown in FIG.

  FIG. 2 also shows the deformation state of the earthquake-resistant flexible duct 20, and since all joint portions are flexible, it is possible to follow the deformation of the ground more. Moreover, when a predetermined watertight test was performed, it was confirmed that there was no water leakage from the joints and that the water stopping ability was sufficient.

BRIEF DESCRIPTION OF THE DRAWINGS It is one Embodiment of the pipeline box which comprises the earthquake-resistant flexible pipeline which concerns on this invention, and its joint structure, (a) is a partial cross section side view of a pipeline box, (b) is a front view of a pipeline box (C) is a partial expanded sectional view of a slot, (d) is a partial expanded front view of a receptacle, (e), (f) is a front view of a water stop rubber ring. It is a side view which shows the earthquake-resistant flexible pipeline which cascaded the pipeline box of FIG.

Explanation of symbols

1 …… Conduit box (RC precast box culvert)
2 ... Male joint with square frame projection (convex outlet)
2A ... Square frame projection 2a ... Outer peripheral surface 3 ... Square frame notch female joint (concave receptacle)
3A ... Square frame-shaped notch 3a ... Inner peripheral surface 10 ... Water stop rubber ring 11 ... Special pad 12 ... Water stop lubricant 20 ... Seismic flexible conduit

Claims (4)

A joint structure of an earthquake-resistant flexible pipe formed by joining a male joint of a square frame-like protrusion and a female joint of a square frame-like notch that fits into a pipe box having both ends opened, On the outer peripheral surface of the square-shaped projection of the male joint, there is a square frame-shaped water-stop rubber ring that has a square shape in front view and does not include a curved portion at each corner . the inner peripheral surface of the rectangular frame-shaped cutout each corner, chevron pad is in contact with the water stop rubber ring in a front view consisting of ultra low hardness Doe elastomer of the gel materials used in the grips applications and cushions applications A joint structure for earthquake-resistant flexible pipes, which is bonded as a water stop aid for each corner. A joint structure of an earthquake-resistant flexible pipe formed by joining a male joint of a square frame-like protrusion and a female joint of a square frame-like notch that fits into a pipe box having both ends opened, On the outer peripheral surface of the square-shaped projection of the male joint, there is a square frame-shaped water-stop rubber ring that has a square shape in front view and does not include a curved portion at each corner . the entire periphery of the rectangular frame-shaped notch in the peripheral surface, the adhesive as a water stop supplementary material pad of ultra-low hardness Doe elastomer of the gel materials used in the grips applications and cushions applications are in contact with the water stop rubber ring A joint structure of an earthquake-resistant flexible pipe characterized by being made. In the joint structure of earthquake resistance flexible pipe according to any one of up to claim 1 or claim 2, shockproof friendly, characterized in that the water stop lubricant on the surface of the water stop rubber ring is applied Flexible pipe joint structure. The joint structure for an earthquake-resistant flexible pipe according to claim 1 or 2 , wherein a water-stopping lubricant is applied to the surface of the pad.

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