JP4277286B2 - Temporary fastening spacer and temporary fastening structure of telescopic flexible pipe joint - Google Patents

Description

  The present invention relates to a pipe joint having stretchability and flexibility, wherein a predetermined fastening allowance is ensured and a temporary fastening spacer that can be easily attached and detached, and each constituent member is connected to the same shaft by the spacer. The present invention relates to a temporary fastening structure of an expansion / contraction flexible pipe joint that can be arranged on a core wire, can be provided at low cost, and can be easily released from temporary fastening.

The present applicant has previously developed and implemented this kind of temporary fastening spacer for a pipe joint having excellent stretchability and flexibility, and a technique for temporarily fastening a pipe joint using the temporary fastening spacer. The one described in Patent Document 1 is known. This prior application technique is as shown in FIGS. 10 to 12. According to this prior application technique, the joint body 2 in which the inner diameter of the tapered receiving portion 3 is set larger than the outer diameter of the joining tube 1 and the central portion in the axial direction swells in a drum shape to form a wide cavity 4 inside. And the insertion port 5 of the bonded tube 1 is inserted into the receiving port 3. Then, a rubber packing 6 for sealing is inserted between the outer peripheral surface of the insertion portion 2 of the joint body 2 and the receiving portion 3 of the joint body 2, and is pushed into the joint body 2 with a push ring 7 from behind. Yes. This pressing is performed by inserting a tightening bolt 11 into a bolt hole 10 of the protrusion 8 formed on the outer periphery of the end face of the joint body 2 and a bolt hole 9 of the press ring 7 corresponding to the bolt hole 10 and tightening with a nut 12. It is done by doing.
Japanese Patent No. 2932268

  Thereby, the outer peripheral wedge surface and the inner peripheral wedge surface of the rubber packing 6 are pressed between the tapered receiving portion 3 of the joint main body 2 and the outer peripheral surface of the joint pipe 1, and the joint pipe 1, the joint main body 2, and the like. Are concentrically held and also seal fluid leakage from the connection site. In this state, the pipe end of the joint pipe 1 can move freely without interfering with the inner wall of the joint body 2 in the cavity 4 of the joint body 2. On the other hand, it can be refracted and has flexibility.

  Thus, the joint body 2, the rubber packing 6, and the presser wheel 7 are shipped from the factory in a state of being temporarily tightened by the tightening bolts 11 and the nuts 12 in order to prevent loss in the middle. If such a temporarily tightened pipe joint can be constructed without being disassembled, its workability is extremely convenient. Therefore, in the prior application technique, a temporary fastening spacer 14 is used. Two temporary fastening spacers 14 are arranged so as to be opposed to the protruding portion 8 of the joint body 2 and the outer peripheral surface of the press ring 7, and one temporary fastening spacer 14 is longer than the length of one side. It arrange | positions so that it may become long and may straddle the two tightening bolts 11. FIG. Further, the spacer 14 has self-elasticity in the bending direction, and in a normal state, as shown by a chain line in FIG. 11, the shape of the protrusion 8 of the joint body 2 and the outer peripheral surface 7a of the press ring 7 (the outer periphery thereof). It is formed so as to expand more than the angle formed by the surface. The temporary fastening spacer 14 has a sheet base material 15 to be joined to the outer peripheral surface 7a of the press wheel 7, and two kinds of large and small ribs 17 and 18 projecting in the inner diameter direction on the inner surface side of the sheet base material 15 are respectively predetermined. Are arranged at intervals. These ribs 17 and 18 have a cylindrical shape with a bottom, and are configured not to be easily deformed by a tightening torque of about 100 kgf · cm, for example.

  In this prior application technique, shipment from the factory is performed in a temporarily tightened state shown in FIG. That is, the rubber packing 6 is fitted into the receiving port 3 of the joint main body 2 so that the outer peripheral surface is similar to the outer peripheral surface between the joint main body 2 and the push ring 7 and is larger than these outer peripheral surfaces. A temporary fastening spacer 14 is fitted through a frame (not shown). Then, the bolt 11 and the nut 12 are fastened and the joint body 2 and the press ring 7 are assembled together, and the pipe joint is shipped from the factory in this state. In this case, the temporary fastening spacer 14 has its sheet base material 15 joined to the outer peripheral surface 7 a of the press wheel 7, and large and small ribs 17 and 18 interposed between the press wheel 7 and the end surfaces of the joint body 2. .

  Further, the bolt 11 and the nut 12 can be quickly fastened with an impact wrench or the like, and the joint body 2 and the push ring 7 are firmly fastened with the temporary fastening spacer 14 sandwiched therebetween. As a result, the joint body 2, the pusher wheel 7, and the rubber packing 6 are shipped with the three center lines being coincident with each other, and are not displaced until the site enforcement. For an impact wrench, for example, the tightening torque may exceed 100 kgf · cm. Even with such a tightening torque, the distance between the push wheel 7 and the joint body 2 is maintained at a predetermined size due to the presence of the large and small ribs 17 and 18 of the temporary tightening spacer 14. That is, it is possible to secure a fastening allowance for the final fastening.

  However, in the temporary fastening structure of the previous application, as shown in FIG. 12, since the draft angle at the time of casting is formed on the end surface side 2A of the joint main body 2, as it goes to the outside, The interval increases. Therefore, the large and small ribs 17 and 18 of the temporary fastening spacer 14 may protrude outward from between the push wheel 7 and the end surface 2A of the joint body 2 and may come off. In order to prevent the protrusion, the bolt 11 and the nut 12 are strongly tightened. However, if the bolt 11 and the nut 12 are excessively tightened, the ribs 17 and 18 are pushed out by the draft during the casting and protrude outside. After all, it was off. In addition, in order to tighten strongly, it takes time to loosen the bolts 11 and the nuts 12 when joining the pipes, and there is a drawback that it is difficult to remove the temporary fastening spacers 14.

  Further, when the temporary fastening spacer 14 is removed, the space between the pusher wheel 7 and the joint body 2 becomes free space, and the connection between the pusher wheel 7 and the joint body 2 becomes rattled, and the bolt 11 and the nut are caused by vibration during transportation. There was a problem that 12 was lost and lost. Further, there is a problem that the press ring 7 compresses the rubber packing 6 to reduce the diameter, and the joining tube 1 cannot be inserted in the temporarily tightened state. In addition, the center lines of the joint body 2, the packing 6, and the presser wheel 7 are not aligned, and when the joining pipe 1 is inserted into the joint body 1, the rubber packing 6 and the joint according to the degree of insertion of the joining pipe 1. There was a problem that the main axis of the main body 2 had to be finely adjusted.

Furthermore, as shown by the chain line in FIG. 11, the provisional fastening spacer 14 of the prior application is pushed in from the state where both end sides are expanded by self-elasticity, and the bolt 11 and The nut 12 had to be fastened, which was troublesome.
In addition, the temporary fastening spacer 14 of the prior application has a structure along the outer peripheral surface of the press wheel 7, and an optimum temporary fastening spacer 14 is prepared for production according to the pipe diameter of the target joining pipe 1. It was necessary to keep it.

  The present invention is obtained by improving and removing the above in view of the above-described problems, and can be used for various pipe diameters with a certain tightening margin ensured, and can be easily assembled and removed, and can be bolted. , It is intended to provide a temporary fastening spacer and a temporary fastening structure for an expansion / contraction flexible pipe joint that does not come off naturally even when the nut is loosened.

The means of claim 1 adopted by the present invention to solve the above-mentioned problems is a sheet base material disposed on one or both of the outer peripheral surface side of the projecting portion of the pipe or joint body and the press ring, and the sheet base material. A pipe or joint body connected to the distal end side of the connecting portion and projecting in the inner diameter direction from both ends of the pipe or joint body to ensure a predetermined allowance between the projecting portion of the pipe or joint body and the press ring The connection portion and the rib that are fitted to the two bolts are formed on one sheet base material having a length straddling the two bolts, and the C-shaped rib is fitted to the fastening bolt. The base material can be bent at both ends between the connecting portions, and the interval between the ribs can be changed by bending the portions near both ends and rotating the connecting portion and the ribs. This is a temporary fastening spacer for a flexible pipe joint.
In this invention, since the C-shaped ribs provided so as to protrude in the inner diameter direction from the both ends of the sheet base material via the connecting portions are externally fitted to the fastening bolts, Even when the space between the press wheels is loose, the temporary fastening spacer does not come off, and the space between the two can be reliably maintained. Further, the temporary fastening spacer of the present invention is a system in which the ribs are fitted to the bolts, and the interval between the ribs can be absorbed by the bending of the sheet base material, so it can be applied to various pipe diameters. .

The means of claim 2 adopted by the present invention is a means for tightening a press ring by inserting a screwless joining pipe into a pipe or joint body having a tapered receiving portion and inserting and inserting an annular rubber packing. In a telescopic flexible pipe joint that is fastened to a pipe or a joint body by a certain bolt and nut, the temporary fastening spacer according to claim 1 is provided between a protrusion of the pipe or the joint body and a press ring. Two or more in total are arranged at least at opposite positions while extending or bending the both end sides between the connecting parts of the base material linearly so that the distance between the ribs matches the distance between the bolts. A temporary fastening structure for an expansion / contraction flexible pipe joint, wherein a spacer, a push ring, a rubber packing, and a pipe or a joint body are temporarily fastened integrally with a bolt and a nut.
In the present invention, the pipe or joint main body, the press ring, and the rubber packing can be aligned on the same axis, and smooth free action is possible. Further, the temporary fastening structure of the expansion / contraction flexible pipe joint according to the present invention is a system in which the ribs are fitted to the bolts, and the interval between the ribs can be absorbed by the bending of the sheet base material. It is applicable to.

  In the present invention, since the C-shaped rib provided protruding from the both end sides of the sheet base member in the inner diameter direction through the connecting portion is externally fitted to the fastening bolt, Even when the space between the press wheels is loose, the temporary fastening spacer does not come off, and the space between the two can be reliably maintained. Further, in the present invention, the ribs of the temporary fastening spacers are fitted to the bolts, and the interval between the ribs can be absorbed by the bending of the sheet base material. Applicable. Furthermore, even a pipe joint using four or more tightening bolts and nuts can be temporarily tightened with two temporary tightening spacers, so that the temporary tightening spacers are not forgotten to be removed.

  The configuration of the present invention will be described below based on the embodiments shown in the drawings. In addition, the same code | symbol as the conventional case is the same member. 1 to 4 relate to the first embodiment of the present invention. FIG. 1A is a plan view of a temporary fastening spacer 20 and FIG. 1B is a temporary fastening spacer 20. FIG. 2A is a plan view when the temporary fastening spacer 20 is applied to a pipe joint for joining a joining pipe having a nominal diameter of 200 mm, FIG. 2B is a front view thereof, and FIG. 3 is FIG. It is XX sectional drawing of (B). 4A is a front view showing the maximum application width of the temporary fastening spacer 20, FIG. 4B is a front view showing the minimum application width, and FIG. It is a front view which shows a state.

  As shown in FIG. 1A and FIG. 1B, the temporary fastening spacer 20 is a popular product as a resin material, and hard vinyl chloride, epoxy, polyethylene, polypropylene, etc. that can be obtained at low cost. Molded with resin material. As shown in FIG. 3, two temporary fastening spacers 20 are arranged so as to face the protruding portion 8 of the joint body 2 and the outer peripheral surface of the push ring 7. 20 is arrange | positioned so that it may become longer than the length of one side, and it straddles two tightening bolts 11. FIG.

  Further, the temporary fastening spacer 20 has a sheet base material 21 to be joined to the outer peripheral surface 7a of the press wheel 7, and C-shaped ribs are formed on both end sides of the sheet base material 21 via connecting portions 22 protruding in the inner diameter direction. 23 is provided. Two sets of these connection portions 22 and ribs 23 are provided at a predetermined interval with respect to one sheet base material 21 so as to be externally fitted to the two tightening bolts 11. The intermediate part between the connection parts 22 of the sheet | seat base material 21 is formed in the narrow width | variety, and this narrow part is a push ring 7 between the volt | bolts 11 and 11 in this Example, as shown in FIG. And the projecting portion 8 of the joint body 2 so as to be installed. Furthermore, both end sides of the sheet base material 21 have curved portions that also serve as gripping portions at the time of attachment / detachment, and corrugated plate portions 24 that can be expanded and contracted are formed in the curved portions. The connecting portion 22 has a structure that does not easily deform with a tightening torque of about 100 kgf · cm, for example.

  Thus, the dimension in the thickness direction of the connecting portion 22 is determined when the joint body 2, the push ring 7, and the rubber packing 6 are fastened with the tightening bolt 11 and the nut 12 in the temporarily tightened state shown in FIG. 3. The dimensions are set so that the push wheel 7 does not move the rubber packing 6 forward. As a result, it is possible to sufficiently secure the allowance for the final tightening performed at the time of subsequent construction. Accordingly, in this temporarily tightened state, the rubber packing 6 does not perform a diameter reducing operation along the tapered receiving portion 3. Therefore, the inner diameter of the rubber packing 6 remains larger than the outer diameter of the bonded tube 1.

  In this embodiment, the rubber packing 6 is fitted and attached to the receiving port 3 of the joint body 2 between the joint body 2 and the press ring 7 in a temporarily tightened state excluding the insertion of the joint pipe 1. Then, the temporary fastening spacer 20 is fitted, and a C-shaped rib 23 provided on the distal end side of the connecting portion 22 is externally attached to the outer peripheral surface of the bolt 11. Then, the bolt 11 and the nut 12 are fastened and the joint body 2 and the press ring 7 are assembled together, and the pipe joint is shipped from the factory in this state. In this case, the temporary fastening spacer 20 has the sheet base material 21 joined to the outer peripheral surface 7 a of the press wheel 7, and the connection portion 22 is interposed between the press wheel 7 and the end surfaces of the joint body 2.

  Temporary fastening can be quickly performed with the bolt 11 and the nut 12 with an impact wrench or the like, and the joint body 2 and the push ring 7 are firmly fastened with the temporary fastening spacer 20 sandwiched therebetween. As a result, the joint body 2, the pusher wheel 7, and the rubber packing 6 are shipped with the three center lines being coincident with each other, and are not displaced until the site enforcement. For an impact wrench, for example, the tightening torque may exceed 100 kgf · cm. Even with such a tightening torque, the distance between the push wheel 7 and the joint body 2 is maintained at a predetermined size due to the presence of the connecting portion 22 of the temporary tightening spacer 20. That is, it is possible to secure a fastening allowance for the final fastening.

  Further, at the time of this temporary fastening, as shown in FIG. 3, the connecting portion 22 of the temporary fastening spacer 20 is pressed by the end face of the push ring 7 and the end face of the joint body 2, and is compressed and deformed to be in a recessed state. That is, the end surface of the push ring 7 and the end surface of the joint body 2 bite into the connecting portion 22, and the temporary fastening spacer 20 is prevented from being pulled out. For this reason, the temporary fastening spacer 20 does not deviate in the outer diameter direction regardless of the draft when the joint body 2 is cast. The effect of the retaining is maintained unless the fastening bolt 11 and the nut 12 are loosened at the construction site including during transportation.

  In the construction site of the pipe joint, it is only necessary to insert the pipe end on the insertion side of the joined pipe 1 from the outside of the temporarily tightened pipe joint. This is because the temporary fastening is rigidly performed as described above, and the three shaft centers of the pusher wheel 7, the joint body 2, and the rubber packing 6 are the same from the factory shipment to the enforcement site. This is because they are held as they are and do not shift. Further, the connecting portion 22 of the temporary fastening spacer 20 ensures that a predetermined fastening allowance is formed between the pusher wheel 7 and the protruding portion 8 of the joint body 2, thereby reducing the diameter of the rubber packing 6. This is also because the inner diameter is secured larger than the outer shape of the bonded tube 1. As described above, since the bolts are firmly tightened, the bolts 11 and nuts 12 do not come off during transportation. Thus, since it is not necessary to remove the tightening bolt 11 and the nut 12 in the temporarily tightened state when installing the pipe joint, these small members are not lost and the construction work is efficient.

  After the joining pipe 1 is inserted, the bolt 11 and the nut 12 are slightly loosened. Then, the corrugated plate portion 24 of the temporary fastening spacer 20 is gripped to pull up the sheet base material 21 and the rib 23 that is externally fitted to the bolt 11 is removed. Thereby, the temporary fastening spacer 20 can be removed. After that, the nut 12 may be quickly tightened to the final tightening by hand tightening, and finally the bolt 11 and the nut 12 may be finally tightened. As a result, the press ring 7 moves forward by the amount of the fastening allowance for the final tightening, and the rubber packing 6 moves forward in accordance with this, and the rubber packing 6 is compressed by the action of the tapered receiving portion 3 of the joint body 2. Radial operation is started. And it press-contacts to the outer peripheral surface of the joining pipe | tube 1, and performs an original sealing effect | action. Further, even if the temporary fastening spacer 20 is at a lower position, there is an advantage that part of both end sides of the sheet base material 21 can be seen from the side surface, and it is not forgetting to remove.

By the way, as shown in FIG. 4A, the temporary fastening spacer 20 has an interval A between the ribs 23 and 23 at both ends when the sheet base material 21 extends in a straight line. It is a dimension that can be externally fitted in the state where the distance between them is the farthest. Further, as shown in FIG. 5B, ribs 23, 23 rotating together with the connecting portions 22 by bending the end portions 24, 24 between the connecting portions 22, 22 in the sheet base material 21 are provided. The distance B when facing each other is a dimension that can be externally fitted when the distance between the tightening bolts 11 is the narrowest. In practice, it is applicable even if the length is shorter than the dimension B. In that case, however, the sheet base material 21 does not adhere to the outer peripheral surface of the press wheel 7 and swells outward, which may interfere with transportation. There is a risk of damage, which is not preferable. The figure (C) of the same figure shows the state before mounting | wearing.
Accordingly, when the dimension R of the connecting portion 22 is 29 mm, the temporary fastening spacer 20 has a dimension A of 160 mm and a dimension B of 100 mm. In other words, the temporary fastening spacer 20 can be applied to a joining pipe having an outer diameter of 100 mm to 160 mm.

  FIG. 5 shows a case where the temporary fastening spacer 20 is applied to a pipe having a nominal diameter of 250 to 300 mm. In this case, six tightening bolts 11 are used for the pipe joint, but even in this case, only two temporary fastening spacers 20 are required to face each other. Moreover, since the two sets of ribs 23 and connecting portions 22 that are mounted across the two bolts 11 and 11 are connected by one sheet base material 21, the gripping portions on both ends of the sheet base material 21. As the corrugated plate portion 24 is exposed to the side surface of the pipe joint, it can be visually checked, so it is not forgotten to remove it.

  6 to 9 show temporary fastening spacers 25 to 28 according to second to fifth embodiments of the present invention. The temporary fastening spacer 25 of the second embodiment shown in FIG. 6 has connecting portions 22 and 22 attached to both end sides of the sheet base material 21, and ribs 23 and 22 are attached to the leading end side in the inner diameter direction of the connecting portions 22 and 22. 23 are provided. And the corrugated board parts 24 and 24 are provided in the opposite side to the sheet | seat base material 21 of the connection parts 22 and 22. FIG. The corrugated plates 24, 24 in this case are used as gripping portions when the temporary fastening spacer 20 is removed from the pipe joint during construction. Other configurations and operational effects are the same as those of the first embodiment.

  Further, the temporary fastening spacer 26 of the third embodiment shown in FIG. 7 is a case where the corrugated plates 24 and 24 of the second embodiment shown in FIG. 6 are provided in the direction of the sheet base material 21. It is. Other configurations and operational effects are the same as those of the second embodiment.

  Further, in the temporary fastening spacer 27 of the fourth embodiment shown in FIG. 8, the corrugated plate portions 24, 24 of the third embodiment shown in FIG. . Other configurations and operational effects are the same as those of the third embodiment.

  Furthermore, in the temporary fastening spacer 28 of the fifth embodiment shown in FIG. 9, an annular gripping portion 29 is provided at an intermediate portion of the sheet base material 21. In this case, the temporary fastening spacer 28 can be removed by holding the intermediate gripping portion 29 of the sheet base material 21 and pulling it upward. The ribs 23 and 23 on both ends of the sheet base material 21 are then fastened to the fastening bolt 11. Can be removed simultaneously. Other basic configurations and operational effects are the same as those in the above embodiments.

  By the way, this invention is not limited to the Example mentioned above, A suitable change is possible. Moreover, although the case where two spacers 20 and 25-28 for temporary fastening are provided facing the outer peripheral surface of the pushing wheel 7 and the protrusion part 8 of the coupling main body 2 was demonstrated, it seems that two or more two or more things are arrange | positioned. It may be. Furthermore, even if these temporary fastening spacers 20 are different in size and outer peripheral surface shape of the push wheel 7 and the joint body 2, one type of temporary fastening spacers 20, 25 to 28 can sufficiently cope with them. It is possible and there is no need to prepare for each size of pipe to be joined. Furthermore, the temporary fastening spacer may be disposed along the outer peripheral surface on one side of the pipe or the joint body, or may be disposed along both outer peripheral surfaces. What is important is that the temporary fastening spacer is disposed so that the connecting portion is interposed between the press ring and the pipe or the joint body.

FIG. 1A is a plan view of a temporary fastening spacer, and FIG. 1B is a front view thereof, according to a first embodiment of the present invention. FIG. 2 shows a case where the temporary fastening spacer according to the first embodiment of the present invention is applied to a pipe joint using four tightening bolts and nuts, and FIG. Is a front view of the same. FIG. 3 is a cross-sectional view taken along line XX in FIG. 2 (B) according to the first embodiment of the present invention. FIG. 1A to FIG. 1C are front views for explaining that a temporary fastening spacer can cope with various dimensions, according to the first embodiment of the present invention. FIG. 2 shows a case where the temporary fastening spacer according to the first embodiment of the present invention is applied to a pipe joint using six tightening bolts and nuts, and FIG. Is a front view of the same. It is a front view which shows the spacer for temporary fastening which concerns on the 2nd Embodiment of this invention. The temporary fastening spacer which concerns on the 3rd Embodiment of this invention is shown, A figure (A) is a front view, A figure (B) is a side view. The temporary fastening spacer which concerns on the 4th Embodiment of this invention is shown, A figure (A) is a front view, A figure (B) is a side view. The temporary fastening spacer which concerns on the 5th Embodiment of this invention is shown, A figure (A) is a front view, A figure (B) is a top view. It is a fragmentary longitudinal cross-section which shows the temporary fastening structure of the pipe joint which this applicant developed previously. It is a longitudinal cross-sectional front view which shows the temporary fastening structure of the pipe joint which this applicant developed previously. It is the YY sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Joint pipe, 2 ... Joint main body, 4 ... Cavity, 6 ... Rubber packing, 7 ... Push ring, 11 ... Tightening bolt, 12 ... Nut, 20 ... Temporary fastening spacer, 21 ... Sheet base material, 22 ... Connection part 23 ... ribs, 24 ... corrugated plate

Claims (2)

A sheet base material disposed on one or both of the outer peripheral surface side of the projecting portion of the pipe or joint body and the press ring, a connection portion projecting in the inner diameter direction from both ends of the sheet base material, and a distal end side of the connection portion And a C-shaped rib that fits a fastening bolt of the pipe or joint body to ensure a predetermined allowance between the protruding part of the pipe or joint body and the press ring. The connecting portion and the rib that are fitted to two bolts are formed on one sheet base material having a length straddling the bolt, and the sheet base material can bend both end portions between the connecting portions, A spacer for temporary fastening of an expansion / contraction flexible pipe joint, wherein a distance between ribs is changed by bending a portion near both ends and rotating the connecting portion and the rib. Insert a screwless joining pipe into a pipe or joint body having a tapered receiving part, insert an annular rubber packing, and tighten the pipe or joint body with bolts and nuts as fastening means for the press ring. In the expansion / contraction flexible pipe joint, the temporary fastening spacer according to claim 1 is provided between the projecting part of the pipe or the joint main body and the press ring, and both end sides between the connection parts of the sheet base material are disposed. Two or more in total are arranged at least at opposite positions while being linearly stretched or bent so that the distance between the ribs matches the distance between the bolts, and the temporary fastening spacer, push ring, rubber packing, pipe or A temporary fastening structure for an expansion / contraction flexible pipe joint, wherein the joint body is temporarily fastened integrally with a bolt and a nut.

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