JP4101226B2 - Pipe fitting device for pressure drainage - Google Patents

Description

  The present invention relates to a pipe joint device for connecting a pipe body that pumps wastewater from a drainage section to an external discharge section.

As a joint device to connect the drainage pipe for pressure feeding,
1) Welding a flange with a number of bolt holes around the circumference of the two pipe ends to be connected, sandwiching a packing made of rubber, for example, between the flanges, and bolting both flanges to make a pressure-resistant connection things and,
2) Cut the outer circumference of the two pipe ends to be connected, waterproof with sealing tape, and then rotate and insert both pipes with a pressure-feeding joint device with female thread fittings at both ends, and pressure-resistant connection there were. However, in recent years, in order to improve durability, soundproofing, and environmental performance, hard vinyl chloride lining steel pipes for drainage (so-called DVLP) with rust-proof resin treatment on the inner periphery have been frequently used, and the outer pipe layer is processed. It has become impossible to use the above conventional method.

  As a coupling device that does not process the outer pipe layer, an annular packing having a trapezoidal cross-sectional shape is inserted on the pipe, and the packing is tightened by using two fittings to increase the frictional force of the packing. There is a flexible pipe joint device that prevents slipping out (abbreviated as A joint). As an improved version, Noto 3099370, which has a plurality of hard spheres arranged in the packing, pressurizes the hard spheres by the hypotenuses of the joints to cause biting on the tube surface, and improves the resistance to slipping out by its resistance. There is a device (abbreviated as B joint).

  By the way, in the case of the joint device for connecting the pressure drainage pipe, it is necessary to be able to withstand the pulsating water pressure when the pump is up. Therefore, when a test was conducted by a general pulsating hydraulic pressure test method in which a pipe material of 30 cm was connected using the above-described joint device and a water pressure of 0.1 MPa to 1.0 MPa was repeatedly applied at a cycle of 21 times per minute, A It was revealed that the joint fell off in less than 40 times (less than 2 minutes) and could not be used practically. In addition, in the B joint using the hard ball together, it dropped out after about 510,000 times (about 17 days) as a result of the long-term limit test. Since this corresponds to a range of about one year to two and a half years as a period of use in the actual use state, it is determined that it cannot be used as it is.

In addition, in order to use the A joint for piping for pumping and draining, a fastening fitting for preventing the pipe from coming off is also provided, which is used by fastening together with the pipe joint device. However, since this tightening bracket is structured to be fastened together with several bolts together with the joint bracket containing the packing, even if the bolt nut is tightened, the inner diameter displacement of the tightening bracket is slight, and the inner surface of the tightening bracket relative to the pipe surface It is considered that it is hardly possible to improve the gripping force due to. When a test was performed in which a 30 cm tube was connected with a joint device and a pulling load was applied in the same manner as described above, the A joint was pulled out at 2 KN to 20 KN, while the joint with a clamp was 20 KN to 30 KN. Although the variation is reduced, the pull-out load is only increased about 1.5 times, and it is insufficient for the pull-out load of 40KN to 60KN of the B joint. Absent.

Utility model registration No. 3099370

  The present invention has been made by paying attention to the above points, and the problem can be applied without selecting a pipe type, exhibits high pull-out resistance as a pipe joint for pressure drainage, and improves the reliability of joint connection. This is a significant improvement. Moreover, the other subject of this invention is providing the pipe joint apparatus for pressure drainage which can construct a joint connection easily on the spot.

In order to solve the above-described problems, the present invention provides a pipe joint device for connecting a pipe body that pumps waste water from a drainage section to an external discharge section, between the outer peripheral surface of the pipe body and the inner slope of the joint ring. What is a fastening means for inserting a packing in which a plurality of rigid spheres are arranged and pressurizing the rigid sphere to the outer peripheral surface of the tubular body by a component force of the inner slope when fastening the joint ring, and fastening the joint ring? Separately , the grip portion for tightening the outer peripheral surface of the tubular body is provided as an integral structure with a gap between the joint ring portion and a means is provided.

The pipe joint device of the present invention is applied to a connecting portion of a pipe body that pumps wastewater under pressure. For example, in a drainage system of a building, it is pumped from an internal drainage tank to an external discharge path using a pump or the like. This is the case. The pipe body to which the present invention is applied is not limited to any kind, and can be applied to the hard vinyl chloride steel pipe for drainage referred to as DVLP described above and a steel pipe that has been used conventionally.

  The present invention corresponds to an improved invention located on the extension of its own technology, and has a configuration in which a plurality of rigid spheres are arranged in the inserted packing between the outer peripheral surface of the pipe body and the inner slope of the joint ring. This configuration is basically the same as the configuration of the invention of the utility model registration No. 3099370 described above. In this configuration, when the joint ring is tightened, the rigid sphere is pressed against the outer peripheral surface of the tubular body by the component force of the inner slope to cause biting, and the resistance to pulling out can be improved by the resistance force. When the joint ring is tightened, the packing inserted on the pipe is also tightened, and the frictional force is increased in the same manner as in the case of the A joint and B joint, thereby contributing to prevention of the pipe from coming out.

  Such a joint device is provided with a grip portion for tightening the outer peripheral surface of the tubular body. The grip portion is characterized in that the grip portion is fixed to the tube body with a strong gripping force, and is tightened independently of the fastening means for tightening the joint ring and is provided as an integral structure with the joint portion. In other words, the grip portion is firmly fixed to the pipe body independently, and also fixes the joint device by being partially connected to the joint portion.

  Since the grip portion can have various shapes and structures, for example, the grip portion has a C-clamp type front shape having an end portion that can be opened and closed. It is possible to adopt a configuration in which the part is tightened with a bolt and nut in the direction of closing (see FIGS. 2 to 4). In this example, the grip portion has an inner diameter equal to or smaller than the outer diameter of the tubular body to be inserted, and at the time of insertion, the end portion is expanded to an inner diameter larger than the outer diameter of the tubular body, and onto the tubular body. It is possible to improve the adhesion by stopping the expansion of the rear end of the tube and tightening the outer peripheral surface of the tube by the diameter difference (see FIG. 3).

  Further, the grip portion exhibits a gripping force by an elastic force, and the elasticity can be improved by a structure in which the thickness gradually increases from the end portion that can be opened and closed (see FIG. 4). Accordingly, it is possible to obtain an elastic force that can cope with various pulling forces applied to the grip portion and external forces such as various vibrations. When it has this structure, it is set as the structure integrated with the joint in the part of maximum thickness. Since it is desirable for the grip portion to have symmetry, the center portion of the C-clamp type front shape is the maximum thickness portion and is integrated with the joint portion at that location.

  In addition, the grip portion can take a configuration composed of a pair of substantially semicircular portions. In this case, each grip portion is integrated with the joint portion at each central portion, and is provided separately in advance. The structure which tightens with the volt | bolt nut in the direction which closes the edge part made is taken (refer FIG. 5). Each grip portion is substantially the same shape and the same size as a half of a circle. It is desirable that the grip portion has a friction increasing portion on the inner peripheral surface that can come into contact with the outer peripheral surface of the tube body to increase the friction resistance against the pulling direction force of the tube body (see FIG. 6). . The friction increasing portion can be obtained by forming a groove or a protrusion on the inner peripheral surface of the grip portion or by applying a lining having a high frictional resistance.

  Since the present invention is configured and operates as described above, it can be applied to connection of any pressure drainage pipe without selecting a pipe type, and exhibits high pull-out resistance as a pressure drainage pipe joint. There is an effect that the reliability of the connection can be remarkably improved. Further, according to the present invention, since there is almost no need for processing the pipes to be connected, the joint connection can be easily performed on site.

  Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 is an illustration of a pressure-drainage pipe joint device 10 according to the present invention attached to a pipe body 11.

  In the figure, 11 is a pipe body, 12 is a joint pipe, the joint pipe 12 has a central portion 13 having the same diameter as the inner diameter of the pipe body, and has bolt fastening portions 14, 14 'at both ends. A joint ring 15 is combined with the bolt fastening portions 14, 14 '. The bolt tightening portions 14 and 14 ′ and the joint ring 15 are provided with bolt holes, and the bolt 16 as a fastening means can be tightened together with the insertion nut 17. Note that the nut 17 is not essential because a female screw can be provided in the bolt hole of the joint ring 15 and used instead. The joint pipe 12 and the joint ring 15 constitute a joint portion 18 in the present invention. A packing arrangement portion for attaching the packing according to the present invention is provided on the inner periphery of the joint portion 18, and the inner periphery of the joint ring 15 is tapered toward the outer side of the joint portion 18 as an inner slope 19. A slope is provided.

The packing body 20 includes an annular portion 21 that can be fitted to the outer surface of the tubular body 11, an end portion 22 that extends from one end of the annular portion 21 in the tube axis direction, and another end that extends from the other end of the annular portion 21 in the tube axis direction. It consists of a portion 23 and is provided with a hard sphere 25 or the like. The rigid spheres 25 are attached to the one end portion 22 of the packing body 20 at equal intervals in the circumferential direction to form a contact point array 26, and each rigid sphere 25 has a thickness at the attachment portion of the one end portion 22 having a tapered cross section. Therefore, both the inner surface side and the outer surface side are exposed and can contact the outer surface of the tubular body 11 and the inner inclined surface 19 of the joint ring 15. It is also possible to form a slit in the one end portion 22 so as to prevent the compression wrinkles of the packing body 20 from occurring and improve the follow-up performance with respect to the position variation of the tube body 11.

  At the other end portion of the packing body 20, a locking end portion 27 that locks the tube body 11 so as to cover the end portion of the tube body 11 is provided. The locking end portion 27 is located at the tip of the other end portion 23 of the annular portion 21, and the other end portion 23 has a thin film shape so that it has good stretchability. The annular portion 21 and the locking end portion 27 are It does not prevent them from being placed at their intended positions. In addition, the annular part 21 of the packing body 20 has a substantially trapezoidal cross-sectional shape with a thickness that fills the space between the tube body 11 and the joint part 18 and exhibits water tightness (see FIG. 1).

  A grip portion 30 for tightening the outer peripheral surface of the tubular body 11 is provided outside the joint ring 15 as an integral structure with the joint ring 15. The grip portion 30 illustrated in FIGS. 1 to 4 has a C-clamped front shape having end portions 31 and 32 that can be opened and closed. Connected together. The illustrated connecting portion 33 extends approximately one third of the entire circumference as shown by hatching in FIG. 2, and thus the grip portion covers the remaining two thirds including the end portions 31 and 32. 30 is flexible. Bolt holes are opened in the end portions 31 and 32, and bolts 34 that are tightening means are passed therethrough and are tightened with nuts 35.

FIG. 3 shows an example of improving the tightness of the tightening portion in the grip portion 30 having the configuration of FIGS. 1 and 2, whereby the pulling-out resistance against time or temperature change can be improved. FIG. 3 shows an example in which the inner diameter Ds of the grip portion 30 is molded to be equal to or smaller than the outer diameter d _{2 of the} tubular body 11 to be inserted. In the case of insertion onto the tubular body, the wedge 37 is inserted into the opening 36 of the grip portion 30 so that it is attached as Ds> d _{2. After} the joint portion 15 is tightened and the wedge 37 is removed, the grip is removed. The part 30 holds the outer peripheral surface of the tube body 11 under pressure. Furthermore, by tightening to the normal torque with the bolts and nuts 31 and 32, the pull-out resistance can be further improved even if the temperature changes with time.

  FIG. 4 shows an example in which the gripping force elasticity of the grip portion 30 is improved. In this case, the grip portion 30 has a structure in which the thickness (width) gradually increases from the end portions 31 and 32 that can be opened and closed. Since various external forces are applied to the grip portion 30, an elastic force is required to obtain a sufficient gripping force against them, which is effective. When the representative values of the thickness of each part are t1, t2, and t3, the bending width from the center part to the opening part 36 is increased and the elastic force is improved by giving a thickness inclination of t3 <t2 <t1.

Further, FIG. 5 shows an example of a grip portion having a divided structure. This example is suitable for a large diameter, and the grip portion 41, which is an integrated structure with the joint ring 15 and the connecting portions 43, 43 ',
Reference numeral 42 denotes a pair of two substantially semicircular shapes. Accordingly, the openable and closable ends are left and right locations 31, 32, 31 ', 32', and the left and right openings 36, 36 'are fastened by bolt nuts 34, 35, 34', 35 'of the fastening means. The tube body 11 is securely gripped by the elasticity of the pair of grip portions 41 and 42. In the case of a large-diameter pipe, the vibration resistance is remarkably improved by the configuration having the two connecting portions 43 and 43 'shown in FIG.

  FIG. 6 shows an example in which the friction increasing portion 45 is provided on the inner peripheral surfaces of the grip portion 30 and the grip portions 41 and 42. The illustrated friction increasing portion 45 is obtained by processing serrated teeth on the inner peripheral surface of the grip portion or the like, and when the grip portion or the like is tightened, the serrated teeth are against the pulling force of the tube body. It bites into the outer peripheral surface of the body 11 and exhibits a large frictional force. In each drawing, reference numeral 28 denotes a gap, which separates the joint ring 15 and the grip 30.

In order to construct a flexible pipe joint using the apparatus 10 of the present invention having such a configuration, the joint ring 15 is fitted into the pipe body 11 in advance, and then the packing body 20 is fitted into the pipe body 11 in the same manner. . At that time, care is taken to ensure that the locking end portion 27 covers the end portion of the tube body 11 so that the one end portion 22 of the packing body 20 enters between the inner inclined surface 19 of the joint ring 15 and the outer surface of the tube body. To do. Further, it is fitted to the joint pipe 12 so as to cover the outside of the packing body 20, and the bolt 16 is inserted into the bolt hole of the flange portion 14 and the joint ring 15, and the nut 17 is screwed to perform the fastening operation. The bolts 34 are passed through the end portions 31, 32... Of the grip portions 30, which are inserted on the body, and the nuts 35 are tightened to firmly hold the outer peripheral surface of the tube body.

  As a result of the tightening of the bolt 16 and the nut 17, the one end portion 22 of the packing is pushed into the joint ring 15, so that the rigid sphere 25 is pressed against the outer surface of the tubular body 11 by the inner inclined surface 19, and is connected to the grip portion 30. Under the elastic deformation of the flexible part other than the part, the pipe body is pressurized and bites into the outer peripheral surface. In such a fastening state, the annular portion 21 of the packing body 20 sandwiched between the joint ring 15 and the flange 14 is also deformed to complete a watertight joint. Further, even if an external force is applied to shift the tube body 11 and the joint pipe 12 in the pipe axis direction, the pipe body 11 and the joint pipe 12 are firmly fixed by the gripping force of the grip portions 30. Since it is integrated with 15 and opposes the pulling force of the tube 11, it does not come out.

Features of the present invention FIG. 7 shows a repeated bending test method performed on a B joint as an acceleration test of a flexible pipe joint for a drainage steel pipe. For the accelerated deterioration test, the applied water pressure was changed from the normal 0.1 MPa to 0.75 MPa, the load perpendicular to the tube axis direction was repeatedly applied, and the outer surface of the pipe body that had come out was observed, as shown in FIG. The traces of the hard spheres arranged in the packing were dug in a straight line toward the end of the tube, and from this, the hard sphere and the tube body were pushed out by water pressure while firmly contacting each other Understood. FIG. 8 (b) clarifies the internal operation of the joint in the repeated bending test. The bending angle Δθ in this test is ± 30/1000 radians. If the tube is a rigid body, the inner diameter of the joint is 114.3 mm. The displacement Δδ generated at the contact portion of the rigid sphere by bending the tube is 1/2 (114.3) × 30 / 1000≈1.7 mm. In other words, the contact store between the tube and the hard sphere is forced to creep ± 1.7 mm in the joint by repeated bending tests. In other words, it can be understood that creep is generated by internal pressure only by repeated bending, and finally comes out even without external pulling force.

In the present invention, as means for dispersing the bending moment and removing vibration at the contact point of the hard sphere, a grip part 30... Partially integrated with the joint is provided, and the hard sphere contact point constitutes the first. And the second gripping point formed by the pressure contact surface of the grip part 30... Have an anti-pulling force due to water pressure inside the tube more than two orders of magnitude compared to a B joint consisting only of a rigid sphere. In addition to being able to improve, the vibration of the tubular body 11 with the rigid sphere 25 as a fulcrum is eliminated, and the extrusion phenomenon due to the internal pressure can be eliminated against the pulsation vibration during pumping. In the present invention, tightening of the tube 11 at the joint 18 (prevention of water leakage and gripping function by a rigid sphere) and tightening of the grip 30 (gripping to the outer peripheral surface of the tube, anti-slip frictional force, anti-vibration force) Each is an independent function and works effectively because it is not interrelated. Therefore, according to the present invention, a performance improvement of one or two digits is expected compared to the result of dropping at 510,000 times (about 17 days) in the B joint, so that it is possible to obtain a service life of several decades or more. .

The longitudinal cross-sectional view which shows the Example of the pipe joint apparatus for pumping drainage which concerns on this invention. The end view of the one end part side same as the above. The end view which similarly shows one example of a grip part. Similarly, an end view showing another example. The end elevation which shows the 3rd example of a grip part similarly. Sectional drawing which shows the example of a friction increase part. Explanatory drawing which shows the pull-out mechanism of a tubular body. (A) is explanatory drawing which shows the trace of a hard sphere, (b) is explanatory drawing which similarly shows the motion inside a coupling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Tube 12 Joint pipe 14, 14 'Bolt fastening part 15 Joint ring 16 Bolt 18 Joint part 19 Inner slope 20 Packing main body 21 Annular part 22 One end part 23 Other end part 25 Hard sphere 30 Grip part 31, 32, 31', 32 'end portion 33, 43, 43' coupling portion 34, 34 'bolt 35, 35' nut 36, 36 'opening 37 wedge 41, 42 grip portion 45 friction increasing portion

Claims (6)

A pipe joint device for connecting a pipe body for pumping waste water from a drainage section to an external discharge section, wherein a packing having a plurality of rigid spheres arranged between an outer peripheral surface of the pipe body and an inner inclined surface of a joint ring is provided. A grip part that has a configuration in which a rigid sphere is pressed against the outer peripheral surface of the tubular body by the component force of the inner slope when the coupling ring is tightened, and that tightens the outer peripheral surface of the tubular body separately from the fastening means for tightening the joint ring As a one-piece structure with a gap between the joint ring portion and a pressure drainage pipe joint device. A pipe joint device for connecting a pipe body for pumping waste water from a drainage section to an external discharge section, wherein a packing having a plurality of rigid spheres arranged between an outer peripheral surface of the pipe body and an inner inclined surface of a joint ring is provided. A grip part that has a configuration in which a rigid sphere is pressed against the outer peripheral surface of the tubular body by the component force of the inner slope when the coupling ring is tightened, and that tightens the outer peripheral surface of the tubular body separately from the fastening means for tightening the joint ring the has as an integral structure in which exist a gap between the joint ring portion, the grip portion is intended to exert a gripping force by the elastic force, have a structure that gradually increases in thickness from the open end And the pipe joint device for pressure drainage characterized by being integrated with the joint in the part to the maximum thickness . The pressure drainage pipe according to claim 1 or 2 , wherein the grip portion has a C-clamp-type front shape having an end portion that can be opened and closed, and is configured to be tightened by a bolt and nut in a direction in which the end portion is closed. Fitting device. 2. The grip portion has an inner diameter equal to or smaller than an outer shape of a tubular body to be inserted, and widens an end portion when inserted to make the inner diameter larger than an outer shape of the tubular body, and releases the end portion from being widened after insertion. The pipe joint device for pressure drainage given in either of thru / or 3 . The grip portion is composed of a pair of semi-circular grip portions, and each grip portion is integrated with each joint portion, and is tightened with a bolt and nut in a direction to close a previously provided end portion. The pipe joint apparatus for pressure drainage of Claim 1 or 2 comprised by these. 3. The pressure drainage device according to claim 1 or 2 , wherein the grip portion has a friction increasing portion for increasing a frictional resistance against a force in a pulling direction of the tubular body on an inner circumferential surface that can come into contact with the outer circumferential surface of the tubular body. Pipe fitting device.

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