JP4700262B2 - Telescopic flexible tube movement restriction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a movement restricting device for an expansion / contraction flexible pipe comprising a pair of joint parts connected in the middle of a fluid transport pipe such as a water pipe, a gas pipe, and a plant pipe.
[0002]
[Prior art]
As the movement restricting device for the telescopic flexible tube in this type of fluid transport tube, there is known a device for restricting the movement of the telescopic flexible tube as described in Patent Documents 1 and 2. FIG. 4 is a side sectional view of such a movement restricting device for the flexible tube, and the flexible tube 01 is slidable on the slide pipe 04 provided with stoppers 02 and 03 and the slide pipe 04. A ball body 05 having an outer peripheral surface formed in a spherical shape, and a case body 07 in which a spherical portion having the same diameter as the ball body 05 is formed on the inner peripheral surface and is externally fitted to the ball body 05 through a packing 06. Has been.
[0003]
A movement restricting device including a tie rod 08 is provided to prevent the movement of the telescopic flexible tube 01 at the time of conveyance, pipe connection, or the like. This tie rod 08 has male screw portions 08a formed at both ends thereof, and nuts 010 and 011 which are a pair of engaging members arranged inside and outside with the attachment pieces 07a of the case body 07 sandwiched between the male screw portions 08a. The tie rod 08 connects and fixes the left and right joints.
[0004]
[Patent Document 1]
JP 2000-161559 A (FIG. 3)
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-161560 (FIG. 3)
[0005]
[Problems to be solved by the invention]
The above-described conventional tie rod type movement restricting device, when an abnormal external force such as an earthquake or ground subsidence is applied, acts to prevent the outer nut 011 from coming out in the case of a pulling force, but the compressive force in the shrinking direction is When acting, there is no portion that absorbs the external force, and the rod itself may be deformed or damaged, and there is a risk of breaking through the telescopic flexible tube.
[0006]
The present invention has been made in view of the above problems, and an excessive load is applied to a tie rod configured as a movement restricting device even when an abnormal load acting on the fluid transport pipe is not only a tensile force but also a compressive force. An object of the present invention is to provide a movement restricting device for an extendable / contractible flexible tube that can be handled so as not to be hung.
[0007]
[Means for Solving the Problems]
To achieve the above object, the present onset Ming, the movement restriction device of the telescopic flexible pipe comprising a pair of flexible joint portion connected to the middle of the fluid transport pipe,
Each of the pair of joint portions has mounting pieces provided on the outer periphery thereof, and is supported so as to be slidable and sealable with each other. A plurality of tie rods are bridged between the joint portions in the circumferential direction via the mounting pieces. The tie rod is fixed between the mounting pieces by a pair of engaging members disposed inside and outside each of the mounting pieces,
One engaging member disposed on the outer side of the mounting piece is constituted by a double nut comprising a spherical nut that is screwed to a threaded portion at the end of the tie rod and overlapped with a hexagon nut, and the spherical nut and the mounting A spherical washer is interposed between the two pieces and slid on the concave and convex spherical portions, and the other engaging member disposed on the inner side of the mounting piece is a nut screwed into the threaded portion of the tie rod end. It is configured, it is characterized in the Turkey to absorb the abnormal load in the compression direction, and the deformation or destruction of the thread of the nut when an abnormal load deforming the tie rod is applied to the fluid transport pipe.
According to this feature, even if an abnormal load in the compression direction acts on the fluid transport pipe, the tie rod is affected by absorbing the abnormal load due to deformation or breakage of the threaded portion of the nut placed inside the mounting piece. Can not be. Moreover, since a spherical nut and a spherical washer are interposed between the hexagonal nut and the mounting piece arranged on the outside of the mounting piece, the tie rod can be displaced following the spherical nut and the spherical washer even if an eccentric force is applied. Prevents tie rod damage.
[0008]
Furthermore, it is possible to cope with abnormal loads by selecting the thickness and material of the nut.
[0009]
In movement restriction device of the telescopic flexible pipe of the present invention, the tie rod is preferably are evenly arranged in the circumferential direction.
In this way, a balanced force can be absorbed with respect to loads from all directions.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
1 to 3 show a first embodiment of the present invention. FIG. 1 (a) is a side view of an expansion joint provided with an expansion / contraction movement restricting device according to the present invention, and FIG. 1 is a cross-sectional view taken along the line A-B in FIG. 1, and FIG. 2A is a side view illustrating a partial cross-section of an expansion joint including an expansion / contraction movement restricting device. b) is a partial enlarged cross-sectional view of the expansion / contraction movement restricting device, and (c) is a partial enlarged cross-sectional view of the expansion / contraction movement restricting device showing a modification of the engaging member disposed inside the attachment piece.
[0013]
Reference numeral 1 shown in FIG. 1 indicates an expansion joint connected in the middle of the fluid transport pipe. The expansion joint 1 is composed of a pair of flexible joint portions 2 and 4 having a symmetrical structure. Therefore, this flexible joint portion will be described with respect to one flexible joint portion 2, and for the same constituent members of both flexible joint portions 2 and 4, “a” is assigned to one flexible joint portion 2. The other flexible joint portion 4 is denoted by “b” and redundant description is omitted.
[0014]
That is, the flexible joint portion 2 is provided with a fluid transport pipe flange 6a at one end and an attachment piece 10a for attaching and fixing the tie rod 22 to the outer periphery thereof, and a spherical shape whose inner periphery is formed by a spherical sliding contact surface. The receiving cylindrical body 8a, and an insertion cylindrical body 12a which is slid and liquid-tightly inserted and supported via a sealing device 15a in the spherical sliding contact surface of the receiving cylindrical body 8a.
[0015]
One end of the connecting pipe 18 is inserted and held in the sliding holding part H1 of the insertion cylindrical body 12a, and the other end side of the connecting pipe 18 is formed in the insertion cylindrical body 12b of the other flexible joint part 4. The sliding holding portion H2 is inserted and held.
[0016]
The connecting pipe 18 is integrally formed with a pair of annular abutting portions S and S that can abut against the axially inner ends S ′ of the opposing sliding holding portions H1 and H2, and both sliding holding portions H1. , H2 is detachably mounted on the contact ring R which can contact the axially outer end R ′, and both sliding holding portions H1 and H2 are sealingly engaged with the connecting pipe 18 by the seal members F1 and F2. ing.
[0017]
Furthermore, the receptacle cylindrical body 8a of the two flexible joints 2,4, mounting piece 10a provided 8b periphery, between 10b and a plurality of cross-linked data Iroddo 22 in the circumferential direction, these tie rods 22 are relatively It is composed of a rod-shaped body having a high buckling force with high rigidity.
[0018]
Threaded portions are formed at both ends of these tie rods 22, and threaded portions at both ends of the tie rod 22 are inserted between the mounting pieces 10a and 10b, and each mounting piece 10a is formed by a pair of engaging members screwed into the threaded portions. The tie rod 22 is attached to both attachment pieces 10a and 10b by sandwiching both sides of the two attachment pieces 10a and 10b.
[0019]
That is, as shown in FIG. 2 (b), one engaging member disposed outside the mounting piece 10a is a double nut comprising a hexagon nut 20 and a spherical nut 24, and is disposed inside the mounting piece 10a. other engagement member that is constituted by nuts 30.
[0020]
The reason for using the nuts 30, when abnormal load in the compression direction is applied to the fluid transport pipe, by absorbing an abnormal load by deformation or destruction of the nuts 30, directly abnormal load acting on the tie rod 22 and in order to suppress such effects always is to achieve the even not limited to the use of nuts 30, for example, as shown in FIG. 2 (c), ease of deformation A soft tubular body 31 may be screwed into the tie rod 22. Furthermore, although not shown in the figure, a cylindrical body may be inserted into a tie rod and fixed with pins or screws.
[0021]
Next, it will be described in detail with reference to FIG. Inserting the ends of the tie rods 22 with screwed a pre Me nuts 30 on the threaded portion both mounting pieces 10a, the sleeve 26 in 10b of the hole, or fitting from above, both the nuts 30 via the flat washer 28 The flexible joint portions 2 and 4 are set at a constant interval by contacting the inner surfaces of the mounting pieces 10a and 10b.
[0022]
Therefore, both ends spherical washers 25 and spherical nut 24 of the tie rod 22, a hexagonal nut 20 screwed respectively, two mounting pieces 10a, both sides of 10b by clamping the nuts 30 and the spherical washers 25, two mounting pieces 10a , 10b, the tie rod 22 is cross-linked.
[0023]
Next, the operation of the expansion joint configured as described above will be described with reference to FIG.
[0024]
The expansion joint 1 connected in the middle of a fluid transportation pipe such as a water pipe, a gas pipe, and a plant pipe is carried to the site, and is used, for example, buried in the ground as a joint for a water pipe (not shown). After the expansion joint 1 is assembled, a water pressure test is performed.
[0025]
In the water pressure test, a predetermined water pressure is applied to the water pipe connected via the expansion joint 1, and a leak test of the expansion joint 1 is performed. In this case, the tie rod 22 is configured so as not to be deformable by a water pressure load applied in the water pressure test.
[0026]
Since the abnormal load that deforms the tie rod 22 is larger than the load caused by the water pressure applied during the water pressure test, the expansion joint 1 is maintained in a stationary state during transportation, installation, or during the water pressure test.
[0027]
On the other hand, when an axial load or torsion torque is applied to the expansion joint 1 due to occurrence of an abnormal load such as ground subsidence or earthquake after construction, the energy of the tie rod 22 is increased with respect to the pulling force. the can be absorbed, even when acting compressive force in the axial direction into a plurality of tie rods 22 which are cross-linked, especially between the two joints 2, 4, nuts 30 acts on the compression force Gana Tsu DOO 30 By deforming or damaging the threaded portion of, the tie rod 22 or the receptacle cylindrical bodies 8a and 8b of the flexible joint portions 2 and 4 are not directly affected.
[0028]
Further, even when a force or a twisting force is applied to the tie rod 22 from a different direction with respect to the axial direction, the spherical washer 25 of the spherical nut 24 slides on the spherical portions that are in contact with each other, so that local stress is applied to the tie rod 22. It can be prevented from acting.
[0029]
Therefore, according to the expansion / contraction movement restricting device for the expansion joint configured as described above, the flexible joint portions 2 and 4 supported so as to be slidable and sealable at both ends of the connecting pipe 18 are attached to the attachment pieces 10a. , 10b, a plurality of tie rods 22 are bridged in the circumferential direction, screwed into threaded portions formed at both ends of the tie rod 22, and a pair of hexagonal nuts 20 and spherical nuts disposed inside and outside the mounting pieces 10a, 10b. Double nuts and tie rods 22 by nuts 30 is two mounting pieces 10a consisting of 24, since a fixed configuration between 10b, abnormal load in the compression direction also acts on the fluid transport pipe, nuts By absorbing the compressive load by deformation or breakage of the 30 threaded portions, it is possible to prevent the tie rod 22 or the receiving tubular bodies 8a and 8b of the flexible joint portions 2 and 4 from being directly affected. .
[0030]
Further, since the plurality of tie rods 22 are equally arranged in the circumferential direction, a balanced force can be absorbed even with respect to loads from all directions.
[0031]
Further, a spherical nut 24 and a spherical washer 25 which are overlapped with the hexagonal nut 20 and screwed to the threaded portion at the end of the tie rod 22 and the spherical washer 25 slide on the concave and convex spherical portions of each other on the outside of both the mounting pieces 10a and 10b. Therefore, even if an eccentric force acts, the tie rod 22 can be displaced following the spherical washer 25 and the spherical nut 24, and the tie rod 22 can be prevented from being damaged.
[0032]
Next, a modification of the expansion / contraction movement regulating device will be described with reference to FIG. FIG. 3 is a side view of an expansion joint provided with an expansion / contraction movement restricting device as a modification of the embodiment. In addition, the same code | symbol is attached | subjected about the same component as the component mentioned above, and the overlapping description is abbreviate | omitted.
[0033]
In this modified example, both flexible joint portions having the same configuration as the flexible joint portion described in the above embodiment and both sides of a connecting pipe inserted and held by these flexible joint portions are individually connected by a plurality of short tie rods. It is comprised so that it may do.
[0034]
That is, the fixing bands 36 and 36 divided into two are attached to the outer peripheral surfaces on both sides of the connecting pipe 18 ′ inserted and held by the pair of flexible joint portions 2 and 4 so as to be detachable by bolts and nuts.
[0035]
At the radially symmetric positions of the outer circumferences of the fixed bands 36, 36, the mounting pieces 32b, so as to face the mounting pieces 32a, 34a provided on the outer circumferences of the receiving tubular bodies 8a, 8b of the flexible joint portions 2, 4 34b protrudes at the same height position.
[0036]
Between the mounting pieces 32a, 32b and 34a, 34b facing each other, both ends of the tie rods 22a, 22b formed with screw portions at both ends are inserted, and these mounting pieces 32a, 32b and 34a, 34b are opposed to each other. and Luna Tsu bets 30 are Nishi挿disposed inside the, their spherical nut 24 is Nishi挿located outside, the both sides held by the spherical washer 25 which is pressed by a double nut consisting of hexagon nut 20 tie rods 22a, 22b Are each crosslinked.
[0037]
In this way, axial loads and torsional torques individually act on both sides of each joint part 2, 4 and the connecting pipe 18 ′ held by these joint parts 2, 4. tie rods 22a, when the compressive force in the axial direction acts on the 22b, the tie rod 22a or 22b by the compression force Gana Tsu preparative 30 by the action either to deform the threads of nuts 30, damaging, Alternatively, the receiving tubular bodies 8a and 8b of the flexible joint portions 2 and 4 are not directly affected.
[0038]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0039]
According to the invention described in 請 Motomeko 1, also abnormal load in the compression direction is applied to the fluid transport pipe, by absorbing an abnormal load in deformation or breakage of the screw portion of the nut arranged on the inner side of the mounting piece The telescopic movement restriction stopper can be prevented from being affected. Moreover, since a spherical nut and a spherical washer are interposed between the hexagonal nut and the mounting piece arranged on the outside of the mounting piece, the tie rod can be displaced following the spherical nut and the spherical washer even if an eccentric force is applied. Prevents tie rod damage.
[0040]
Furthermore, it is possible to correspond to the abnormal load by selecting the thickness and material of the nuts.
[0041]
According to the invention described in 請 Motomeko 2, it is possible to absorb the balanced force balanced against the load from any direction.
[Brief description of the drawings]
1A is a side view of an expansion joint including an expansion / contraction movement restricting device according to the present invention, and FIG. 1B is a right half view of FIG. It is B sectional drawing.
2A is a side view showing a partial cross section of an expansion joint provided with an expansion / contraction movement restriction device, FIG. 2B is a partial enlarged cross-sectional view of the expansion / contraction movement restriction device, and FIG. It is the same partial expanded sectional view which shows the modification of the engaging member distribute | arranged to.
FIG. 3 is a side view of an expansion joint including an expansion / contraction movement restricting device as a modification of the embodiment.
FIG. 4 is a side sectional view of a conventional movement restricting device for an elastic flexible tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Expansion joint 2, 4 Flexible joint part 6a, 6b Flange 8a, 8b Receptacle cylindrical body 10a, 10b Mounting piece 12a, 12b Insert cylindrical body 14a, 14b Annular contact part 15a, 15b Sealing device 18, 18 'Connection tube 20 hexagonal nut 22 Tairo' de <br/> 22a, 22b tie rod 24 spherical nut 25 spherical washer 26 sleeve 28 plain washer 30 nuts <br/> 31 cylindrical body 32a, 32b mounting piece 34a, 34b attachment piece 36, 36 Fixed band F1, F2 Seal member H1, H2 Sliding holding part R Abutting ring R ′ Axial abutting part S ′ Axis abutting part S ′ Axial abutting end of sliding holding part

Claims (2)

In the movement restricting device of the expansion / contraction flexible pipe comprising a pair of flexible joints connected in the middle of the fluid transport pipe,
Each of the pair of joint portions has mounting pieces provided on the outer periphery thereof, and is supported so as to be slidable and sealable with each other. A plurality of tie rods are bridged between the joint portions in the circumferential direction via the mounting pieces. The tie rod is fixed between the mounting pieces by a pair of engaging members disposed inside and outside each of the mounting pieces,
One engaging member disposed on the outer side of the mounting piece is constituted by a double nut comprising a spherical nut that is screwed to a threaded portion at the end of the tie rod and overlapped with a hexagon nut, and the spherical nut and the mounting A spherical washer is interposed between the two pieces and slid on the concave and convex spherical portions, and the other engaging member disposed on the inner side of the mounting piece is a nut screwed into the threaded portion of the tie rod end. is constructed, stretching said in the compression direction with respect to the fluid transport pipe, and the abnormal load deforming the tie rod and wherein the benzalkonium absorb the abnormal load by deformation or destruction of the thread of the nut when acted Flexible tube movement restriction device.   The expansion / contraction flexible tube movement restriction device according to claim 1, wherein the tie rods are uniformly arranged in a circumferential direction.

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