JP2014015998A - Device and method for preventing oscillation of flange joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for preventing oscillation of a flange joint part occurring with actuation of a boring device.SOLUTION: A device for preventing oscillation of a flange joint part 10 includes: a base part 61 that is arranged oppositely to flange outer peripheral surfaces 23b, 35b of the flange joint part 10 joined with a fastening bolt 12; a fitting member 6 that includes a projection piece part 62 projecting from the base part 61, fitted into a gap between flanges opening toward an outer peripheral side and enabling engagement with the fastening bolt 12 in a tube circumferential direction; and an annular fixation member 7 that is mounted on the outer peripheral side of the flange joint part 10 and fixes the fitting member 6 by fastening it from the outer peripheral side.

Description

  The present invention relates to an apparatus and a method for preventing run-out of a flange joint part in construction for drilling a water pipe while maintaining an unrestricted water state.

  Conventionally, for the purpose of forming a branch port for connecting a branch pipe to an existing water pipe (an example of a fluid pipe) or forming an insertion port for a valve body, an undisturbed water state is maintained. A method of drilling is known. In this construction method, as disclosed in Patent Document 1, after attaching a branch case so as to surround a perforated portion of a water pipe, a perforating device is connected to the branch pipe portion of the branch case via a gate valve. The cutter, which is a rotary cutting tool, is fed through the flow path in the gate valve and the flow path in the branch pipe portion of the branch case.

  In general, a cutter having an outer diameter slightly smaller than the inner diameter of the flow path in the gate valve or branch pipe portion is used in order to ensure the perforation size. Moreover, the driving | running | working part which drives a cutter is comprised by an electric motor, an engine, etc., and the vibration at the time of the action | operation is transmitted to a gate valve and a branch case. For this reason, at the time of drilling, the flange joint part in the section from the branch case to the drilling device may cause vibration with a deviation or inclination of the pipe axis, and the inner surface of the gate valve or the inner surface of the branch pipe part of the branch case Could be damaged by the cutter.

  Patent Document 2 discloses an apparatus that applies a clamping pressure to a flange joint portion by covering the flange joint portion with an annular cover body and bringing the tapered portion formed on the cover body into contact with the outer peripheral edge of the flange. Have been described. However, since the apparatus has a structure in which the outer peripheral edge of the flange is sandwiched from both sides, the effect of preventing the above-described vibration is prevented with respect to the flange joint portion where the gap opened toward the outer peripheral side is formed between the flanges. Is considered scarce.

JP 2002-321109 A JP 2005233321 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a device and a method for preventing the flange joint portion from shaking due to the operation of the drilling device.

  The above object can be achieved by the present invention as described below. That is, the apparatus for preventing run-out of a flange joint according to the present invention includes a base disposed opposite to a flange outer peripheral surface of a flange joint joined by a fastening bolt, a protrusion protruding from the base, and an opening toward the outer periphery. Inserted into the gap between the flanges, and having an insertion member having a projecting piece that can be locked in the pipe circumferential direction with the fastening bolt, and mounted on the outer peripheral side of the flange joint, And an annular fixing member that is fastened and fixed.

  This device can be attached to a flange joint portion in which a gap opened toward the outer peripheral side is formed between the flanges. The fitting member has a base portion that is disposed to face the outer peripheral surface of the flange, and a projecting piece portion that is fitted into a gap between the flanges and can be locked in the pipe circumferential direction. It is easily attached to the part. The fitting member attached to the flange joint part suppresses the fluctuation of the gap between the flanges, and the fitting member is fastened and fixed from the outer peripheral side. As a result, it is possible to prevent the flange joint portion from shaking due to the operation of the punching device.

  In the flange joint vibration preventing apparatus according to the present invention, it is preferable that the protrusion is formed with a recess into which the fastening bolt can enter. Thereby, the position shift of the fitting member attached to the flange joint part can be suitably prevented.

  In the flange joint vibration preventing apparatus according to the present invention, it is preferable to include an elastic belt member arranged in an annular shape so as to cover the outer periphery of the fitting member between the fitting member and the fixing member. By providing such an elastic belt member, the work of tightening and fixing the fitting member with the fixing member can be easily performed, and workability is improved.

  In the apparatus for preventing vibration of a flange joint portion according to the present invention, it is preferable that the thickness of the protruding piece portion gradually increases toward the base portion at a position in contact with the edge portion of the outer peripheral surface of the flange. According to such a configuration, even when there is variation in the size of the gap between the flanges, it is possible to appropriately insert the protruding piece portion and suppress the fluctuation of the gap.

  Further, the method for preventing run-out of the flange joint portion according to the present invention includes disposing the base portion of the fitting member so as to oppose the flange outer peripheral surface of the flange joint portion joined by the fastening bolt, and the protruding piece portion protruding from the base portion. Is inserted into the gap between the flanges opened toward the outer peripheral side to be able to be locked in the pipe circumferential direction with the fastening bolt, and an annular fixing member is provided on the outer peripheral side of the flange joint portion. And a fixing step of fixing the fitting member by tightening from the outer peripheral side.

  In the insertion step, the insertion member is attached to a flange joint portion in which a gap opened toward the outer peripheral side is formed between the flanges. The fitting member has a base portion that is disposed opposite to the outer peripheral surface of the flange, and a projecting piece portion that is fitted into a gap between the flanges and can be locked in the pipe circumferential direction. It can be easily attached and suppresses fluctuations in the gap between the flanges. In the fixing step, the fitting member is fastened and fixed from the outer peripheral side by the fixing member. As a result, it is possible to prevent the flange joint portion from shaking due to the operation of the punching device.

  In the method for preventing run-out of the flange joint portion according to the present invention, it is preferable to include a step of annularly arranging the elastic belt member so as to cover the outer periphery of the fitting member between the fitting step and the fixing step. By using such an elastic belt member, the work of tightening and fixing the fitting member by the fixing member can be easily performed, and workability is improved.

  In the flange joint portion anti-vibration method according to the present invention, the flange joint portion is preferably such that the joint surfaces of the flanges are spaced apart from each other with an annular gasket interposed therebetween. In such a flange joint portion, the present invention is particularly useful because a vibration with a shift or inclination of the tube axis is likely to occur.

Partial cross-sectional side view showing construction equipment for continuous water drilling Enlarged view of the main part of the flange joint The perspective view which shows the component of a shake prevention apparatus Front view of flange joint AA arrow sectional view of FIG. Front view of flange joint with fixed member CC sectional view of FIG. The figure which shows another form of a fitting member FIG. 8 is a front view of a flange joint portion to which the fitting member of FIG. 8 is attached.

  An embodiment of the present invention will be described with reference to the drawings, taking as an example a case where perforated water drilling is performed on an existing water pipe that is a fluid pipe.

  A water pipe 1 shown in FIG. 1 constitutes a part of a pipe line extending in a direction perpendicular to the paper surface. The branch case 2 has a split T-shape formed by combining a plurality of divided pieces, and is attached in a watertight manner so as to surround a perforated portion of the water pipe 1. The branch case 2 of the present embodiment is constituted by three divided pieces 2A, 2B, 2C, which are connected to each other by a fastener 21. The branch pipe portion 22 is provided so as to protrude from the divided piece 2A, and a flange 23 is formed at the tip thereof.

  A piercing device 5 is connected to the branch pipe portion 22 of the branch case 2 via the gate valve 3 and the joint flange 4. The gate valve 3 includes a valve box 31 formed of a tubular body that can communicate between both ends, and a valve body 32 that is displaced between a position where the flow path in the valve box 31 is closed and a position where the flow path is opened. A valve shaft 33 for operating the displacement of the valve body 32 and a valve lid 34 incorporating the valve shaft 33 are provided. At both ends of the gate valve 3, flanges 35 and 36 are respectively formed, and the branch case 2 and the joint flange 4 are flange-joined.

  The joint flange 4 is formed of a tubular body that can communicate between both ends. Flange 41 and 42 are formed at both ends of the joint flange 4 and are joined to the gate valve 3 and the punching device 5 by flange. The joint flange 4 adjusts the position of the cutter 51 in the retracted position so as not to interfere with the valve body 32 when closed, or when the flange diameters of the gate valve 3 and the punching device 5 are different, It is used for the purpose of doing.

  The punching device 5 has a built-in cutter 51 which is a rotary cutting tool. The rotation of the cutter 51 is driven by a driving unit composed of an electric motor, an engine, or the like. The cutter 51 sent forward by the operation of the handle 52 reaches the water pipe 1 through the flow path in the gate valve 3 and the flow path in the branch pipe portion 22, and cuts and forms an opening in the peripheral wall of the water pipe 1. be able to.

  In this embodiment, although the example in which the pipe line in the area from the branch case 2 to the punching device 5 extends in the horizontal direction is shown, it may extend in the vertical direction. In the three flange joint portions 10, 20, and 30 in this section, a pair of flanges whose joint surfaces are opposed to each other are joined by fastening bolts and a gap opened toward the outer peripheral side (FIG. 2). Is formed between the flanges.

  FIG. 2 is an enlarged view of a main part of the flange joint 10. In the flange joint portion 10, the joint surfaces of the flanges are separated from each other with an annular gasket 11 interposed therebetween. The space between the joint surface 23a and the joint surface 35a is sealed by the gasket 11, and the gap G is about several millimeters. The gasket 11 is fitted in an annular groove 35c formed in the joint surface 35a. The type of the flange joint portion 10 corresponds to a combination of RF type (large plane seat type) and GF type (groove shape) described in JIS G 5527: 1998 (when not metal touch).

  In the flange joint parts 20 and 30, the joint surfaces of the flanges are in contact with each other, which corresponds to the RF type-GF type combination (in the case of metal touch) described in the JIS standard. In addition, it is also possible to adopt a format that conforms to the combination of the RF type and the RF type described in the JIS standard. In the flange joint portion in which the gap 14 opened toward the outer peripheral side is formed between the flanges in this way, vibration is likely to occur with the operation of the drilling device 5, and the cutter 51 during drilling is caused by the gate valve. 3 and the inner surface of the branch pipe portion 22 may be damaged.

  Therefore, before the drilling is started, preferably before the drilling device 5 is operated, the shake preventing device is attached to the flange joint portion where such a swing is a concern. The shake preventing apparatus includes a plurality of insertion members 6 and a fixing member 7 as shown in FIG. The shake preventing apparatus of the present embodiment further includes the elastic belt member 8, but this may be omitted as appropriate.

  FIG. 4 is a view of the flange joint portion 10 as viewed from the flange 35 side along the pipe axis direction. FIG. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 2 described above corresponds to a cross section taken along the line B-B in FIG. 4 before the fitting member 6 is mounted. As described above, the flange joint portion 10 is joined by the fastening bolt 12. The fastening bolt 12 is inserted through bolt holes formed at a plurality of locations in the pipe circumferential direction, and the pair of flanges 23 and 35 are nuts screwed to the head of the fastening bolt 12 and the fastening bolt 12. 13.

  The fitting member 6 is fitted into a gap between the base 61 arranged opposite to the flange outer peripheral surfaces 23b and 35b, and the flange protruding from the base 61 and opened toward the outer circumference, and the fastening bolt 12 and the pipe circumferential direction. And a projecting piece portion 62 that can be locked to. The fitting member 6 is preferably made of rubber or synthetic resin so that the flanges 23 and 35 are not peeled off. The fitting member 6 of this embodiment is made of urethane rubber. The base portion 61 may be curved along the flange outer peripheral surface in a natural state, but can be applied to various flange diameters by being flat like the present example.

  The projecting piece portion 62 has a plate shape that rises substantially vertically from the base portion 61, and the protrusion amount P from the base portion 61 is larger than the distance L from the flange outer peripheral surface 35 b to the fastening bolt 12. In the present embodiment, a recess 63 into which the fastening bolt 12 can be inserted is formed in the projecting piece portion 62 so that the fitting member 6 can be easily positioned. The recess 63 has a semicircular shape, but is not limited thereto. When the flange 35 has a pedestal (valve receiving portion) 37, the insertion member 6 and the pedestal are moved by shifting the position of the recess 63 from the center in the longitudinal direction of the projecting piece 62 with respect to the insertion member 6 attached in the vicinity thereof. It is convenient to avoid interference with 37.

  The thickness of the projecting piece 62 gradually increases toward the base 61 at a position where it abuts on the edge of the flange outer peripheral surfaces 23b and 35b. Thereby, even if the size of the gap between the flanges varies, it is possible to insert the protruding piece 62 appropriately and suppress the fluctuation of the gap. In the present embodiment, a pair of inclined surfaces 62 a is formed in a portion where the thickness gradually increases, and the portion where the thickness gradually increases is continued to the base 61. The fitting member 6 may have an L-shaped cross section in which the protruding piece portion 62 protrudes from the end of the base portion 61. However, if it is a T-shaped cross section as in this embodiment, it is excellent in stability at the time of attachment.

  In the present embodiment, a plurality of (that is, four) fitting members 6 corresponding to the bolt positions are used to be attached to each of the bolt positions at four locations in the pipe circumferential direction. Although it is effective to attach the fitting members 6 to all of the bolt positions, these may be omitted appropriately as long as the effect of preventing the shake is obtained. For example, when there are bolt positions at eight locations in the pipe circumferential direction, it is conceivable to attach four insertion members 6 at equal intervals.

  As shown in FIGS. 6 and 7, the fixing member 7 is formed of an annular body that can be mounted on the outer peripheral side of the flange joint portion 10, and fastens and fixes the fitting member 6 from the outer peripheral side. The fixing member 7 is divided into a plurality of pieces in the pipe circumferential direction. In the present embodiment, the fixing member 7 is divided into a band piece 7A and a band piece 7B. The band pieces 7 </ b> A and 7 </ b> B are each made of a metal such as cast iron, and a fastener 72 including a bolt and a nut is attached to the extending portion 71. The fixing member 7 is reduced in diameter according to the fastening of the fastener 72 and presses the fitting member 6 inward.

  The elastic belt member 8 is made of an elastic material such as rubber, and is arranged annularly between the insertion member 6 and the fixing member 7 so as to cover the outer periphery of the insertion member 6. Thereby, when mounting | wearing with the fixing member 7, since the movement of the insertion member 6 is controlled and it becomes easy to clamp the insertion member 6 uniformly, workability | operativity can be improved. The elastic belt member 8 may be a member that winds a long plate-like member having an end, but if it is a disc-like rubber ring as in the present embodiment, it is easy to mount and the fixing belt 7 Excellent fitting performance.

  Hereinafter, an example of a procedure for preventing the shake of the flange joint portion 10 in the continuous water drilling using the above shake prevention device will be briefly described. First, as shown in FIG. 1, the branch case 2 is mounted so as to surround the perforated portion of the water pipe 1, and the perforating device 5 is connected to the branch pipe portion 22 via the gate valve 3 and the joint flange 4.

  Next, the fitting member 6 is attached to the flange joint portion 10 as shown in FIGS. At this time, the base portion 61 is disposed so as to face the flange outer peripheral surfaces 23b and 35b, and the projecting piece portion 62 is fitted into the gap between the flanges so as to be locked with the fastening bolt 12 in the pipe circumferential direction ( Equivalent to insertion process). Subsequently, the elastic belt member 8 is annularly arranged so as to cover the outer periphery of the fitting member 6. 6 and 7, the fixing member 7 is mounted, and the fitting member 6 is fastened and fixed from the outer peripheral side by the operation of the fastener 72 (corresponding to the fixing step).

  After attaching the shake prevention device, the cutter 51 starts to rotate, and the handle 52 is operated to feed the cutter 51 forward. The cutter 51 reaches the water pipe 1 through the flow path in the gate valve 3 and the flow path in the branch pipe section 22, and cuts and forms an opening in the peripheral wall of the water pipe 1. Since no vibration occurs in the flange joint portion 10, the inner surface of the branch pipe portion 22 is not damaged by the cutter 51. When the cutter 51 after drilling is retracted, the flow path is closed by the gate valve 3, and the joint flange 4 and the punching device 5 are removed. The shake prevention device can be removed, but if it is left attached, there is an effect of suppressing the inclination of the tube by its own weight in the subsequent piping.

  In the present embodiment, an example in which a shake prevention device is attached to the flange joint portion 10 between the branch pipe portion 22 and the gate valve 3 of the branch case 2 has been shown, but the same procedure is used to attach to the flange joint portion 20 and the flange joint portion 30. It is possible.

  Moreover, although the several insertion member 6 was used in this embodiment, it is not restricted to this. For example, a long insertion member 9 as shown in FIG. 8 may be prepared, and this may be bent and wound as shown in FIG. A plurality of recesses 93 into which the fastening bolts 12 can enter are formed in the projecting piece portion 92 protruding from the base portion 91. Since the outer peripheral surface of the fitting member 9 is formed uniformly, even if the elastic belt member is omitted, the fitting member 9 is uniformly tightened by the fixing member. However, the elastic belt member may be used in order to hold the fitting member 9.

  In the present embodiment, a water pipe is exemplified as a fluid pipe, but the present invention is not limited to this, and the present invention can be applied to a fluid pipe used for various liquids other than water, such as gas.

  A confirmation test was conducted and will be described below. In the test, a branch case was attached to a water pipe having a nominal diameter of 75 mm and the pipe was filled with water, and a punching device was connected to the branch pipe portion of the branch case via a gate valve and a joint flange. The flange joint portion between the branch pipe portion and the gate valve is a combination of the above-described RF type-GF type (in the case where the metal touch is not used), and GF type gasket No. 2 was adopted. 3 was attached to the flange joint, and the fixing member was tightened until the gap between the band pieces (distance X in FIG. 6) reached a predetermined size. After the drilling operation was completed, no damage was found on the disassembled branch pipe part or the inner surface of the gate valve.

1 Water pipe (an example of a fluid pipe)
2 branch case 3 gate valve 5 punching device 6 fitting member 7 fixing member 8 elastic belt member 10 flange joint part 11 gasket 12 fastening bolt 22 branch pipe part 23 flange 35 flange 51 cutter 61 base part 62 projecting piece part

Claims (7)

A base portion disposed opposite to the outer peripheral surface of the flange joint portion joined by the fastening bolt, and a gap between the flange projecting from the base portion and opening toward the outer peripheral side. A fitting member having a projecting piece that can be locked in the circumferential direction;
An apparatus for preventing run-out of a flange joint, comprising: an annular fixing member that is attached to the outer periphery of the flange joint and that fastens and fixes the fitting member from the outer periphery.   2. The flange joint portion swing prevention device according to claim 1, wherein a recess into which the fastening bolt can enter is formed in the projecting piece portion.   The flange joint portion vibration preventing device according to claim 1, further comprising an elastic belt member arranged in an annular shape so as to cover an outer periphery of the fitting member between the fitting member and the fixing member.   The apparatus for preventing run-out of a flange joint portion according to any one of claims 1 to 3, wherein the thickness of the protruding piece portion gradually increases toward the base portion at a position in contact with an edge portion of the outer peripheral surface of the flange. . The base part of the fitting member is arranged facing the flange outer peripheral surface of the flange joint part joined by the fastening bolt, and the protruding piece part protruding from the base part is inserted into the gap between the flanges opened toward the outer peripheral side. And an insertion process for making the fastening bolt and the pipe circumferentially engageable.
A flange joint portion swing prevention method comprising: a fixing step of mounting an annular fixing member on an outer peripheral side of the flange joint portion, and tightening and fixing the fitting member from the outer peripheral side.   The flange joint portion swing prevention method according to claim 5, further comprising a step of annularly arranging an elastic belt member so as to cover an outer periphery of the fitting member between the fitting step and the fixing step.   The flange joint portion swing prevention method according to claim 5 or 6, wherein the flange joint portions are configured such that the joint surfaces of the flanges are spaced apart from each other with an annular gasket interposed therebetween.

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