JP2004324769A - Displacement restriction equipment of expansible/contractible flexible pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide displacement restriction equipment of an expansible/contractible flexible pipe which can prevent excessive load from being applied to an expanding/contracting displacement restriction stopper constituted as the displacement restriction equipment even when extraordinary load acts on a fluid transportation pipe not only as pulling force but also as contraction force. <P>SOLUTION: A plurality of tie rods (expanding/contracting displacement restriction stoppers) 22a are circumferentially bridged to extend between attachment pieces 32a, 32b of both flexible coupling sections 2, 18. A pair of nuts 20, 40 and an extremely thin nut 30 which are arranged on outer and inner sides of each of the attachment pieces 32, 32b are engaged with a thread portion at each end of the tie rod 22a so that the tie rod 22a is secured between both the attachment pieces 32a and 32b. With such a structure that the extremely thin nuts 30 are arranged on the inner sides of the attachment pieces 32a, 32b, in the case where the extraordinary load acts on the fluid transportation pipe in the direction of expansion/contraction, it is possible to prevent the excessive load from being applied to the tie rod 22a by absorbing the expansion/contraction load due to deformation or breakage of thread portions of the extremely thin nuts 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for restricting the movement of a telescopic flexible pipe comprising a pair of joints 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 a device for restricting the movement of a telescopic flexible tube in this type of fluid transport tube, there is known a device for restricting the movement of a telescopic flexible tube as described in Patent Documents 1 and 2. FIG. 4 is a side sectional view of such a telescopic flexible tube movement restricting device. The telescopic flexible tube 01 has a slide pipe 04 provided with stoppers 02 and 03, and the slide pipe 04 is slidable on the slide pipe 04. A ball body 05 having an outer peripheral surface formed in a spherical shape, and a case body 07 having a spherical portion formed on the inner peripheral surface having the same diameter as the ball body 05 and externally fitted to the ball body 05 via a packing 06. Have been.
[0003]
In addition, a movement restricting device including a tie rod 08 is provided to prevent the movement of the flexible tube 01 at the time of transportation or connection of a pipe. The tie rod 08 has a male threaded portion 08a formed at both ends thereof, and nuts 010 and 011 which are a pair of engaging members disposed inside and outside the male threaded portion 08a so as to sandwich the mounting piece 07a of the case body 07. The tie rod 08 connects and fixes the left and right joints.
[0004]
[Patent Document 1]
JP-A-2000-161559 (FIG. 3)
[Patent Document 1]
JP-A-2000-161560 (FIG. 3)
[0005]
[Problems to be solved by the invention]
The above-described conventional tie-rod type movement restricting device has a function of preventing the outer nut 011 from coming off in the case of a tensile force when an abnormal external force such as an earthquake or land subsidence acts, but the compressive force in the contracting direction is reduced. When it acts, there is no portion for absorbing the external force, and the rod itself may be deformed or broken, and may break through the flexible tube.
[0006]
The present invention has been made in view of the above problems, and when the abnormal load acting on the fluid transport pipe is not only a tensile force but also a compressive force, an excessively large expansion and contraction movement restricting stopper configured as a movement restricting device is provided. It is an object of the present invention to provide a device for restricting the movement of a telescopic flexible tube, which can cope with a large load.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a telescopic flexible tube movement restricting device according to the present invention is a telescopic flexible tube movement restricting device comprising a pair of flexible joints connected in the middle of a fluid transport pipe. The joints are slidably and sealingly supported with each other, and a plurality of expansion / contraction movement restricting stoppers are circumferentially bridged between the joints via mounting pieces in the circumferential direction, and a pair of the mounting pieces are provided inside and outside the mounting pieces, respectively. The expansion / contraction movement stopper is fixed between the mounting pieces by an engaging member, and when an abnormal load in the compression direction acts on the fluid transport pipe, the engaging member disposed inside the mounting piece is deformed. Or being destroyed.
According to this feature, even if an abnormal load in the compression direction acts on the fluid transport pipe, the abnormal load is absorbed by deformation or destruction of the engaging member disposed inside the mounting piece, thereby affecting the expansion / contraction movement stopper. Out of reach.
[0008]
In the movement restricting device for a telescopic flexible tube according to the present invention, it is preferable that the engaging member disposed inside the mounting piece is an extremely thin nut.
In this case, it is possible to cope with an abnormal load by selecting the thickness and the material of the ultra-thin nut.
[0009]
In the movement restricting device for a telescopic flexible tube according to the present invention, it is preferable that the telescopic movement restricting stopper is constituted by tie rods uniformly arranged in a circumferential direction.
This makes it possible to absorb a balanced force with respect to loads from all directions.
[0010]
In the telescopic flexible tube movement restricting device of the present invention, it is preferable that a spherical support is interposed between the engaging member disposed outside the mounting piece and the mounting piece.
With this configuration, even if an eccentric force acts, the expansion / contraction movement restricting stopper can be displaced by following the spherical support, so that damage to the expansion / contraction movement restricting stopper can be prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 3 show a first embodiment of the present invention. FIG. 1A is a side view of an expansion joint provided with an expansion and contraction movement restricting device according to the present invention, and FIG. FIG. 2 is a sectional view taken along the arrow A in FIG. 1, and a left half is a cross-sectional view taken along the line BB of FIG. 1, and FIG. (b) is a partially enlarged cross-sectional view of the expansion and contraction movement restricting device, and (c) is a partially enlarged cross-sectional view of the expansion and contraction movement restriction device showing a modification of the engaging member disposed inside the mounting piece.
[0013]
Reference numeral 1 shown in FIG. 1 indicates an expansion joint connected in the middle of the fluid transport pipe, and the expansion joint 1 includes a pair of flexible joints 2 and 4 having a symmetric 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 given 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 flange 6a for a fluid transport pipe at one end, and a mounting piece 10a for mounting and fixing the expansion / contraction control stopper 22 on the outer circumference thereof, and the inner circumference is formed by a spherical sliding contact surface. A cylindrical receiving port cylindrical body 8a, and an insertion cylindrical body 12a which is slidably and liquid-tightly inserted and supported in a spherical sliding contact surface of the receiving port cylindrical body 8a via a sealing device 15a. I have.
[0015]
One end of the connecting pipe 18 is inserted and held in the sliding holding portion H1 of the insertion tubular body 12a, and the other end of the connecting pipe 18 is formed in the insertion tubular body 12b of the other flexible joint part 4. It is inserted and held in the sliding holding portion H2.
[0016]
The connecting pipe 18 is formed integrally with a pair of annular abutting portions S, S capable of abutting on the axially inner ends S ′ of the opposing sliding holding portions H1, H2, and the sliding holding portions H1. , H2 are detachably mounted with an abutment ring R which can abut against the axially outer end R 'of the shaft. Both sliding holding portions H1, H2 are sealingly engaged with the connecting pipe 18 by sealing members F1, F2. ing.
[0017]
Further, a plurality of tie rods 22 serving as expansion / contraction movement restriction stoppers are circumferentially bridged between the mounting pieces 10a and 10b provided on the outer periphery of the receiving tubular bodies 8a and 8b of the flexible joint portions 2 and 4, respectively. The tie rods 22 are formed of rods having a relatively high rigidity and a buckling resistance.
[0018]
Screw portions are formed at both ends of these tie rods 22. The screw portions at both ends of the tie rod 22 are inserted between the mounting pieces 10a and 10b, and each of the mounting pieces 10a is engaged with a pair of engaging members screwed to the screw portions. The tie rod 22 is attached to both attachment pieces 10a and 10b by sandwiching both sides of the tie rod 22.
[0019]
That is, as shown in FIG. 2B, one of the engaging members disposed outside the mounting piece 10a is a double nut including a hexagon nut 20 and a spherical nut 24, and is disposed inside the mounting piece 10a. The other engaging member is constituted by an extremely thin nut 30.
[0020]
The reason for using the ultra-thin nut 30 is that when an abnormal load in the compression direction acts on the fluid transport pipe, the abnormal load is absorbed by deformation or breakage of the ultra-thin nut 30 and the abnormal load acts directly on the tie rod 22. The effect is not necessarily limited to the use of the ultra-thin nut 30. For example, as shown in FIG. The cylindrical body 31 may be screwed to the tie rod 22. Further, although not shown, a cylindrical body may be inserted into a tie rod and fixed with pins or screws.
[0021]
Next, the telescopic movement restricting device will be described in detail with reference to FIG. Both ends of the tie rod 22 into which the ultra-thin nut 30 has been previously screwed into the threaded portion are inserted through the sleeve 26 in the holes of the mounting pieces 10a and 10b or fitted from above, and the ultra-thin nut 30 is attached to both sides via the flat washer 28. The two flexible joints 2 and 4 are set at a constant interval by contacting the inner surfaces of the pieces 10a and 10b.
[0022]
Then, the spherical washer 25, the spherical nut 24, and the hexagonal nut 20 are screwed from both ends of the tie rod 22, respectively, and both surfaces of both the mounting pieces 10a and 10b are clamped by the ultra-thin nut 30 and the spherical washer 25, so that both the mounting pieces 10a , 10b are bridged between the tie rods 22.
[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 transport pipe such as a water pipe, a gas pipe, or a pipe for a plant is carried to the site, and is buried underground for use as a water pipe joint (not shown). After assembling the expansion joint 1, a hydraulic test is performed.
[0025]
In the water pressure test, a predetermined water pressure is applied to a water pipe connected via the expansion joint 1, and a leak test or the like of the expansion joint 1 is performed. In this case, the tie rod 22 is configured so as not to be deformed by the load due to the hydraulic pressure applied in the hydraulic test.
[0026]
Since the abnormal load at which the tie rod 22 deforms is greater than the load due to the hydraulic pressure applied during the hydraulic test, the expansion joint 1 is maintained in an immobile state during transportation, installation, or during the hydraulic test.
[0027]
On the other hand, if an abnormal load such as land subsidence or an earthquake occurs after the construction, and an axial load or a torsional torque acts on the expansion joint 1, the tie rod 22 expands the energy with respect to the tensile force by elongation of the tie rod 22. In particular, even when an axial compressive force acts on a plurality of tie rods 22 bridged between the joint portions 2 and 4, the compressive force acts on the ultra-thin nut 30 and the ultra-thin nut 30 By deforming or damaging the threaded portion, the tie rod 22 or the receiving port cylindrical bodies 8a and 8b of the flexible joints 2 and 4 are not directly affected.
[0028]
Further, even when a force or torsional force is applied to the tie rod 22 from different directions with respect to the axial direction, local stress is applied to the tie rod 22 by sliding the spherical washers 25 of the spherical nut 24 on the spherical portions in contact with each other. It does not work.
[0029]
Therefore, according to the expansion and contraction movement restricting device of the expansion joint configured as described above, the two flexible joint portions 2 and 4 slidably and sealably supported at both ends of the connecting pipe 18 are provided with their mounting pieces 10a. A plurality of tie rods 22 are circumferentially bridged between the tie rods 22 and 10b, and a pair of hexagonal nuts 20 and spherical nuts which are screwed into screw portions formed at both ends of the tie rods 22 and are disposed inside and outside of the two mounting pieces 10a and 10b, respectively. The tie rod 22 is fixed between the two mounting pieces 10a and 10b by the double nut 24 and the ultra-thin nut 30. Therefore, even if an abnormal load in the compression direction acts on the fluid transport pipe, the ultra-thin nut By absorbing the compressive load due to the deformation or breakage of the threaded portion 30, the tie rod 22 or the receiving cylinders 8 a, 8 b of the flexible joints 2, 4 are prevented from being directly affected. Can.
[0030]
Further, since the plurality of tie rods 22 are equally arranged in the circumferential direction, it is possible to absorb a balanced force with respect to loads from all directions.
[0031]
Further, on the outer sides of the mounting pieces 10a and 10b, a spherical nut 24, which is overlapped with the hexagon nut 20 and screwed to the threaded portion at the end of the tie rod 22, and a spherical washer 25 slide on the concave and convex spherical portions. Thus, even if an eccentric force acts, the tie rod 22 can follow and displace via 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 telescopic movement restricting device will be described with reference to FIG. FIG. 3 is a side view of an expansion joint including a telescopic movement restricting device according to a modification of the above embodiment. The same components as those described above are denoted by the same reference numerals, and redundant description will be 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 configured so that
[0034]
That is, the two fixed bands 36, 36 are detachably attached to the outer peripheral surfaces on both sides of the connecting pipe 18 'which is inserted and held by the pair of flexible joints 2, 4, by bolts and nuts.
[0035]
At the radially symmetric positions of the outer circumferences of the fixed bands 36, 36, the mounting pieces 32b, 34a are provided so as to face the mounting pieces 32a, 34a provided on the outer circumference of the receiving tubular bodies 8a, 8b of the flexible joints 2, 4. 34b protrudes at the same height.
[0036]
Two ends of the tie rods 22a and 22b each having a threaded portion at both ends are inserted between the opposing mounting pieces 32a and 32b and 34a and 34b, and these mounting pieces 32a, 32b and 34a and 34b are opposed to each other. The tie rods 22a and 22b are sandwiched on both sides by an ultra-thin nut 30 screwed inside and a spherical washer 25 screwed outside and pressed by a double nut composed of a spherical nut 24 and a hexagon nut 20. Are respectively crosslinked.
[0037]
In this way, the axial load and the torsional torque individually act on both sides of each joint part 2, 4 and the connecting pipe 18 'held by these joint parts 2, 4, and in particular, a plurality of When an axial compressive force acts on the tie rods 22a and 22b, the compressive force acts on the ultra-thin nut 30 to deform or break the threaded portion of the ultra-thin nut 30 so that the tie rod 22a or 22b, Alternatively, the receiving cylinders 8a, 8b of the flexible joints 2, 4 are not directly affected.
[0038]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0039]
(A) According to the first aspect of the present invention, even if an abnormal load in the compression direction acts on the fluid transport pipe, the abnormal load is absorbed by deformation or breakage of the engaging member disposed inside the mounting piece. Thereby, it is possible to prevent the expansion / contraction movement stopper from being affected.
[0040]
(B) According to the second aspect of the invention, it is possible to cope with an abnormal load by selecting the thickness and the material of the ultra-thin nut.
[0041]
(C) According to the third aspect of the invention, it is possible to absorb a balanced force with respect to loads from all directions.
[0042]
(D) According to the fourth aspect of the present invention, even if an eccentric force acts, the telescopic movement restricting stopper can follow and displace via the spherical support, so that damage to the telescopic movement restricting stopper can be prevented.
[Brief description of the drawings]
1 (a) is a side view of an expansion joint provided with an expansion / contraction control device according to the present invention, and FIG. 1 (b) is a view on the right half of FIG. It is B sectional drawing.
2A is a side view showing a partial cross section of an expansion joint provided with a telescopic movement restricting device, FIG. 2B is a partially enlarged cross sectional view of the telescopic movement restricting device, and FIG. It is the same partially expanded sectional view which shows the modification of the engagement member arrange | positioned in FIG.
FIG. 3 is a side view of an expansion joint including a telescopic movement restricting device according to a modification of the embodiment.
FIG. 4 is a side sectional view of a conventional movement restricting device for a telescopic flexible tube.
[Explanation of symbols]
1 Expansion joints 2, 4 Flexible joints 6a, 6b Flanges 8a, 8b Receptacle cylindrical bodies 10a, 10b Mounting pieces 12a, 12b Inserting cylindrical bodies 14a, 14b Annular contact parts 15a, 15b Sealing devices 18, 18 'Connection Pipe 20 Hex nut 22 Tie rod (Extension / retraction control stopper)
22a, 22b Tie rod 24 Spherical nut 25 Spherical washer 26 Sleeve 28 Flat washer 30 Ultra-thin nut 31 Cylindrical bodies 32a, 32b Mounting pieces 34a, 34b Mounting pieces 36, 36 Fixed bands F1, F2 Seal members H1, H2 Sliding holding section R abutment ring R 'axially outer end S of slide holder S annular abutment S' axially inner end of slide holder

Claims (4)

In a telescopic flexible tube movement restricting device comprising a pair of flexible joints connected in the middle of the fluid transport pipe, the pair of joints are slidably and sealingly supported with each other, and between the two joints. A plurality of telescopic movement restricting stoppers are circumferentially cross-linked via mounting pieces, and the telescopic movement restricting stoppers are fixed between the mounting pieces by a pair of engaging members disposed inside and outside of each of the mounting pieces. A moving restricting device for a telescopic flexible tube, characterized in that, when an abnormal load in the compression direction acts on the fluid transport pipe, the engaging member disposed inside the mounting piece is deformed or broken. 2. The movement restricting device for a telescopic flexible tube according to claim 1, wherein the engaging member disposed inside the mounting piece is an extremely thin nut. The movement restricting device for a telescopic flexible tube according to claim 1 or 2, wherein the telescopic movement restricting stopper is constituted by tie rods uniformly arranged in a circumferential direction. 4. The movement restricting device for a telescopic flexible tube according to claim 1, wherein a spherical support is interposed between the engaging member disposed outside the mounting piece and the mounting piece.

Images