JP2013029153A - Method for cutting fluid conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cutting fluid conduit, capable of recovering a support stand from the inside of a housing.SOLUTION: The method for cutting a fluid conduit 1 is provided for cutting the fluid conduit 1 in a state without stopping flow by causing a cutter member 52 to proceed toward the radial direction of the fluid conduit 1, and for installing a flow control body 11 that controls the flow of a fluid in the housing 2, in the housing 2 attached to the fluid conduit 1 to be a sealed state. The method includes: a step of cutting, by the cutter member 52, the fluid conduit 1 in the range containing a part in which the support stand 40 is arranged on the side opposite to the cutter member 52 of the fluid conduit 1 in the housing 2 and which is supported by the support stand 40; a subsequent step of retaining the support stand 40 by using retention means 40h, 53c; and a step of recovering the support stand 40 together with cut piece 1b produced by cutting the fluid conduit 1 from the inside of the housing 2.

Description

  The present invention cuts the fluid pipe in an uninterrupted state by advancing the cutter member in the radial direction of the fluid pipe in a casing that is hermetically attached to the fluid pipe, thereby controlling the flow of the fluid in the casing. The present invention relates to a method of cutting a fluid pipe for installing a control fluid.

  Conventionally, in a sealed housing (housing) that is hermetically attached to an existing fluid pipe (fluid pipe), a part of the existing fluid pipe is cut by a cutter (cutter member) in an uninterrupted state and switched to this cutting location. There is one in which the flow in the existing fluid pipe (fluid pipe) is stopped or branched by inserting a valve (fluid control) (see, for example, Patent Document 1).

Japanese Patent No. 4144690 (page 5, FIG. 8)

  In such a sealed housing (housing) described in Patent Document 1, since the cutter (cutter member) applies force to the existing fluid pipe in order to cut the existing fluid pipe (fluid pipe), the existing fluid In order to prevent the pipe from being deformed by the force applied from the cutter, a support base that contacts the fluid pipe is arranged in the sealed housing so as to face the cutter, and supports the cutting of the fluid pipe by the cutter when the fluid pipe is cut. It is conceivable that the base supports the fluid pipe. In this case, if the section and the support base are not recovered from the housing after cutting the fluid pipe, a switching valve (fluid control) is inserted into the housing. There is a problem that you can not.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a fluid pipe cutting method capable of recovering a support base from the inside of a casing.

In order to solve the above-described problem, a fluid pipe cutting method of the present invention includes:
In a casing that is hermetically attached to the fluid pipe, the fluid control is performed by cutting the fluid pipe in an uninterrupted state by advancing the cutter member in the radial direction of the fluid pipe, and controlling the flow of fluid in the casing. A fluid pipe cutting method for installing
A support base is disposed on the side of the fluid pipe facing the cutter member in the casing, and the support pipe is cut by the cutter member in a range including a portion supported by the support base. Is held using a holding means, and the support base is collected from the inside of the casing together with a section generated by cutting the fluid pipe.
According to this feature, the support base abuts and supports the fluid pipe at a position facing the cutter member in the housing with respect to the cutter member that advances in the radial direction of the fluid pipe to cut the fluid pipe. The stand receives not only the force by which the cutter member presses the fluid pipe in order to cut the fluid pipe, but also prevents the deformation of the fluid pipe when the fluid pipe is cut, and also holds the support base by the holding means. Since the section can be collected together with the support table, the fluid control can be installed in the housing without hindrance while allowing the support table to be reused.

The fluid pipe cutting method of the present invention comprises:
The holding means is provided on the cutter member.
According to this feature, the support base can be held by the holding means in a state where the fluid pipe is cut by the cutter member. Therefore, the cutter pipe and the holding means can be configured in a compact and simple manner, and the number of steps of the fluid pipe can be reduced. Cutting and collection of the section and support from the housing can be performed.

The fluid pipe cutting method of the present invention comprises:
The cutter member is provided with supporting means for supporting the section collected from the housing.
According to this feature, since the section can be supported on the support base after the fluid pipe is cut by the cutter member, the positional deviation of the section on the support base can be suppressed during recovery.

The fluid pipe cutting method of the present invention comprises:
The supporting table is provided with a supporting means for supporting the section collected from the housing.
According to this feature, the section can be supported by the support means with a simple configuration in which the support means is provided on the support base.

The fluid pipe cutting method of the present invention comprises:
The support base is locked to the housing by a plurality of locking means that can be removed in the retracting direction of the cutter member.
According to this feature, the support means can be fixed in the housing against the fluid pressure of the fluid by the locking means, so that the position of the section caused by the cutting of the fluid pipe is prevented and held. Since the means is held in the state where the section is held, the support base is released from the lock by the lock means, so that the support base can be easily recovered from the inside of the case.

It is front sectional drawing which shows the state by which the housing | casing was attached to the fluid pipe | tube in an Example. It is side sectional drawing which shows the state by which the housing | casing was attached to the fluid pipe | tube. It is a partially broken cross-sectional top view which shows the state by which the housing | casing was attached to the fluid pipe | tube. It is a partially broken side sectional view showing a state where a cutter member is arranged above a fluid pipe. It is AA sectional drawing of the cylindrical body in FIG. It is a partially broken side sectional view showing a state where a cutter member cuts a fluid pipe. It is front sectional drawing which shows the state which the cutting | disconnection of the fluid pipe | tube by the cutter member was complete | finished. It is a sectional side view which shows the state which inserts and arranges a fluid control in a housing | casing. It is a sectional side view which shows the state which inserted and arrange | positioned the fluid control in the housing | casing.

  A mode for carrying out a fluid pipe cutting method according to the present invention will be described below based on an example.

  The fluid pipe cutting method according to the embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the fluid pipe 1 of the present embodiment is made of a resin pipe such as high-density polyethylene formed in a substantially cylindrical shape, extends in a substantially horizontal direction, and has a fluid inside. Water is flowing. For example, as shown in FIGS. 1 and 8, the fluid pipe 1 is configured such that a housing 2 for communicating a new bypass pipe 12 with the fluid pipe 1 is sealed at a predetermined position. The fluid pipe 1 is cut in the casing 2 by a cutter member 52 (see FIGS. 4 and 6), which will be described later, and the fluid control fluid 11 inserted and arranged in the casing 2 is operated to rotate. The flow path can be switched between the fluid pipe 1 and the bypass pipe 12.

  The material of the fluid pipe 1 is not limited to high density polyethylene, but may be other polyolefin resin or the like. In the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe 1 is not necessarily limited to clean water, and may be, for example, industrial water or sewage, or gas. Or a fluid pipe through which a fluid in a gas-liquid mixed state flows may be used.

  As shown in FIGS. 1 and 2, a housing 2 fixedly attached to the outer peripheral surface 1 a of the fluid pipe 1 is disposed from above with respect to the fluid pipe 1 and covers the upper side of the outer circumference of the fluid pipe 1. 1 case 3 and the 2nd case 4 which is arrange | positioned from the downward direction with respect to the fluid pipe | tube 1 and coat | covers the outer periphery of the fluid pipe | tube 1 is comprised. The first case 3 and the second case 4 are made of a metal material such as cast iron.

  In addition, the first case 3 includes a pair of contact portions 3 a that are in contact with the outer circumferential surface 1 a of the fluid pipe 1 along the pipe shaft direction along the pipe shaft direction. On the inner wall of each contact portion 3a that faces the outer peripheral surface 1a of the fluid pipe 1, a water stop member 20a that contacts the outer peripheral surface 1a of the fluid pipe 1 along the substantially entire length in the circumferential direction of the first case 3 is a fluid. A pair is provided along the tube axis direction of the tube 1.

  Between the contact portions 3a and 3a of the first case 3, a substantially circular circumferential surface 3h is formed in a plan view facing inward of the first case 3. A branch port 3g is formed at an upper portion of the circumferential surface 3h so as to extend upward along the tube axis direction of the fluid pipe 1 so as to be substantially orthogonal to the pipe axis of the fluid pipe 1. The branch port 3g is formed to penetrate in the vertical direction, and an upper flange 3i is formed at the upper end of the branch port 3g. Further, flanges 3n formed to project toward the outer diameter direction of the fluid pipe 1 at both ends of the fluid pipe 1 in the first case 3 have a substantially semicircular arc shape when viewed from the front. Thus, it extends over the circumferential direction of the first case 3.

  As shown in FIG. 1, at a substantially central portion in the tube axis direction of the fluid pipe 1 of the first case 3, a half cylinder portion 3 e having a semicircular arc shape in a side sectional view is a horizontal direction that is an outer diameter direction of the fluid pipe 1. It is formed to project toward. On the inner wall of the semi-cylindrical portion 3e, there is provided a water stop member 20b that comes into contact with the outer peripheral surface 12a of the bypass pipe 12 as will be described later along the substantially entire length in the circumferential direction. Further, at the end of the semi-cylindrical portion 3e, a flange 3r formed to protrude toward the outer diameter direction of the semi-cylindrical portion 3e extends over the circumferential direction of the semi-cylindrical portion 3e so that the housing 2 forms a substantially semicircular arc shape. It is extended.

  As shown in FIG. 1 and FIG. 8, the fluid control 11 is easily inserted into the housing 2 at both end portions in the tube axis direction of the fluid tube 1 of the half tube portion 3 e in the first case 3. Flat surfaces 3 j and 3 k (see FIG. 2) that incline downward are formed from the circumferential surface 3 h to the lower end of the first case 3. Further, as shown in FIG. 1, in the same manner as the flat surfaces 3 j and 3 k, the fluid control 11 can be easily inserted into the housing 2 on the inner wall facing the half cylinder portion 3 e in the first case 3. A flat surface 3m that is inclined downward is formed from the circumferential surface 3h to the lower end of the first case 3.

  As shown in FIGS. 1 and 2, the first case 3 has a pair of flanges 3c and 3c (one is not shown) facing the outer diameter direction of the fluid pipe 1 continuously to the contact portion 3a. Is formed so as to protrude along the pipe axis direction of the fluid pipe 1. The other flange 3c (not shown) is formed so as to form a pair of substantially L-shapes in plan view from both end portions in the tube axis direction of the fluid pipe 1 of the first case 3 along the half cylinder portion 3e.

  The second case 4 is provided with an abutting portion 4 a that has substantially the same width dimension in the tube axis direction of the fluid pipe 1 as the first case 3 and abuts on the outer peripheral surface 1 a at the lower part of the fluid pipe 1. On the inner wall of the contact portion 4a facing the outer peripheral surface 1a of the fluid pipe 1, a water stop member 20c that contacts the outer peripheral surface 1a of the fluid pipe 1 along the substantially entire length in the circumferential direction of the second case 4 is provided. A pair is provided along the direction of one tube axis. Further, flanges 4n formed to project toward the outer diameter direction of the fluid pipe 1 at both ends of the fluid pipe 1 in the second case 4 have a substantially semicircular arc shape when viewed from the front. Thus, it extends over the circumferential direction of the second case 4.

  In addition, a semi-cylindrical portion 4e having a semicircular arc shape in a side sectional view is formed in a substantially central portion in the tube axis direction of the fluid pipe 1 of the second case 4 so as to protrude toward the horizontal direction that is the outer diameter direction of the fluid pipe 1. Has been. On the inner wall of the semi-cylindrical portion 4e, there is provided a water stop member 20d that abuts on the outer peripheral surface 12a of the bypass pipe 12 as will be described later along substantially the entire length in the circumferential direction. The water stop member 20d and the water stop members 20c and 20c are integrally formed continuously through a water stop member 24 described later.

  At the end of the semi-cylindrical part 4e, a flange 4r formed to project toward the outer diameter direction of the semi-cylindrical part 4e extends in the circumferential direction of the semi-cylindrical part 4e so as to form a substantially semicircular arc shape in the housing 2. It is installed. The projecting dimensions of the flanges 3n, 3r, 4n, and 4r from the contact portions 3a and 4a and the half cylinder portions 3e and 4e are all the same.

  As shown in FIG. 1 and FIG. 7, the fluid control 11 is easily inserted into the housing 2 at both end portions in the tube axis direction of the fluid tube 1 of the half tube portion 4 e in the second case 4. Flat surfaces 4j and 4k that are inclined downward are formed from the upper end portion of the second case 4 to the lower portion.

  Further, the inner wall facing the half cylinder portion 4e in the second case 4 is inclined downward so that the fluid control 11 can be easily inserted into the housing 2 in the same manner as the flat surfaces 4j and 4k. A flat surface 4m is formed from the upper end portion of the second case 4 to the lower portion. Furthermore, these flat surfaces 4j, 4k, 4m are extended to the inner bottom of the second case 4 and intersect horizontally. On the flat surfaces 4j, 4k, and 4m that intersect at the inner bottom of the second case 4, a fluid control 11 is arranged as will be described later.

  As shown in FIGS. 1, 2 and 3, the second case 4 has a pair of flanges 4c and 4c which are continuous to the contact portion 4a and face in the outer diameter direction of the fluid pipe 1 in the fluid. It is formed so as to protrude along the tube axis direction of the tube 1. One flange 4c of these flanges 4c, 4c is formed so as to form a pair of substantially L-shapes in plan view from both ends in the tube axis direction of the fluid pipe 1 of the second case 4 along the half cylinder part 4e. Has been.

  As described above, the housing 2 constituted by the first case 3 and the second case 4 has flanges 3n, 4n, which are ends of the fluid pipe 1 in the housing 2 in the axial direction in the present embodiment. The flange 3n, 4n and the mounting member 22 made of a resin material attached to the flanges 3r, 4r, which are the end portions of the half cylinders 3e, 4e, are fixed to the fluid pipe 1 so as to be immovable. Yes. The mounting members 22 attached to the flanges 3n, 4n, 3r, 4r have the same configuration, and only the mounting member 22 attached to the flange 3n will be described.

  As shown in FIG. 2, the attachment member 22 is formed in a substantially semicircular arc shape having an inner diameter substantially the same as the outer diameter of the fluid pipe 1 and the bypass pipe 12. The attachment member 22 has a fusion part 22 a in which a heating wire 22 b that generates heat when current flows therein is disposed over substantially the entire length in the circumferential direction of the attachment member 22. Each end of the heating wire 22b is connected to a connecting portion 23 provided on the outer surface of the mounting member 22 so as to be electrically connected to an external power source. Further, the attachment member 22 is formed with a fitting space 22e (see FIG. 1) having substantially the same shape as the flange 3n.

  As shown in FIGS. 1, 2 and 3, the second case 4 in this embodiment is in contact with the lower part of the fluid pipe 1 when the fluid pipe 1 is cut, and the fluid pipe 1 is viewed from below. A support base 40 to be supported is arranged. The upper portion of the support base 40 includes a support portion 40a having a horizontal surface that comes into contact with the outer peripheral surface 1a of the fluid pipe 1 from below in order to support the fluid pipe 1 from below.

  A pair of leg portions 40c, 40c extend downward from both ends of the fluid pipe 1 in the support portion 40a in the tube axis direction, and the end on the flat surface 4m side of the second case 4 in the support portion 40a. From the portion, a leg portion 40d extends downward. Further, both end portions of the leg portion 40d in the tube axis direction of the fluid pipe 1 are configured as a pair of tip portions 40e and 40e extending downward. And the leg part 40f is extended toward the downward direction from the edge part by the side of the half cylinder part 4e of the 2nd case 4 in the support part 40a.

  Of these, the leg 40c on one side is in contact with the inner bottom of the second case 4 between the flat surfaces 4j and 4m, and the leg 40c on the other side is the second between the flat surfaces 4k and 4m. It comes into contact with the inner bottom of the case 4. Further, the lower end of the leg 40d is disposed above the flat surface 4m, and the tip 40e on one side of the leg 40d abuts against the inner bottom of the second case 4 between the flat surfaces 4j and 4m. The other end 40e is in contact with the inner bottom of the second case 4 between the flat surfaces 4k and 4m.

  The leg portion 40f comes into contact with the inner bottom portion of the second case 4 between the flat surfaces 4j and 4k. That is, the support base 40 in the present embodiment avoids the flat surfaces 4j, 4k, and 4m that are horizontally intersecting at the inner bottom portion of the second case 4 and the second portions by the leg portions 40c, 40c, 40d, and 40f. It is arranged upright in the case 4.

  From the end on the flat surface 4m side and the end on the half cylinder 4e side of the second case 4 in the support portion 40a, it is longer than the radius of the fluid pipe 1 and shorter than the diameter of the fluid pipe 1 upward. Wall portions 40h, 40h, which are small, are erected. The wall portions 40h, 40h erected on the support base 40 constitute a support means in the present invention. The left-right width dimension between the wall portions 40h, 40h is slightly longer than the diameter of the fluid pipe 1.

  As shown in FIG. 6, the side portions facing both inward in the horizontal direction of the support base 40 at both end portions of both wall portions 40h, 40h on the tube axis direction side of the fluid pipe 1 (in this embodiment, one wall portion 40h). (Only shown) is formed with a plurality of cutouts 40j, 40j into which one end side of rods 57a of plungers 57, 57, which will be described later, is inserted in the vertical direction.

  The end surfaces of the notches 40j, 40j facing the tube axis direction of the fluid pipe 1 are formed as vertical surfaces 40k with the upper side facing the vertical direction, and the lower side is the side surface of the support base 40 that is the tube axis direction of the fluid pipe 1 It is formed on a tapered surface 40m that is inclined downward toward the outer side in view. Furthermore, at both ends of both wall portions 40h, 40h on the tube axis direction side of the fluid pipe 1, the lower side of the tapered surface 40m on the side facing the inner side in the horizontal direction of the support base 40 is located on the lower side of the fluid pipe 1. A recessed portion 40n that opens in the tube axis direction is formed.

  A concave portion 4p is formed upward between the flat surfaces 4j and 4k, between the flat surfaces 4k and 4m, and between the flat surfaces 4j and 4m in the inner bottom portion of the second case 4. In these recesses 4p, a fixing pin 6 as an engaging means in the present invention facing upward is inserted so as to protrude from the inner bottom portion (in this embodiment, it is inserted into the insertion hole 40g of the leg portion 40f). Only the fixing pin 6 is shown). In addition, the front end portions 40e, 40e and the leg portion 40f of the leg portion 40d are formed with insertion holes 40g through which the fixing pins 6 are inserted. For this reason, the support base 40 in the present embodiment is arranged in the second case 4 so that the fixing pin 6 is inserted into each insertion hole 40g and the position in the second case 4 is fixed. Yes.

  As shown in FIG. 4, the cutter member 52 includes a cylindrical body 53 that is open toward the lower side with a larger diameter than the fluid pipe 1 at the end on the fluid pipe 1 side. A blade 53a for cutting the fluid pipe 1 is formed at the end of the cylindrical body 53 on the fluid pipe 1 side. In addition, an infinite number of flow holes 53 b that penetrate the wall surface of the cylindrical body 53 are formed on the wall surface of the cylindrical body 53.

  Inside the cylindrical body 53, an opening 53c that opens downward is formed. As shown in FIGS. 4 and 5, the left and right ends of the opening 53 c in the cylindrical body 53 are opposed to the left and right ends in a plan view, respectively, in the direction of the tube axis of the fluid pipe 1 as holding means in the present invention. A pair of plungers 57, 57 are attached. Each plunger 57, 57 is mainly composed of a cylindrical body 57b facing the tube axis direction of the fluid pipe 1 and a rod body 57a inserted into the cylindrical body 57b, and in the cylindrical body 57b. A biasing means such as a coil spring (not shown) is provided.

  For this reason, one end side of the rod 57a inserted through the cylinder 57b is disposed so as to protrude out of the cylinder 57b by the biasing means. Each plunger 57, 57 is attached in the cylindrical body 53 so that one end side of the rod body 57a protruding outside the cylinder body 57b of the rod body 57a is opposed.

  Furthermore, a guide plate 54 that is movable in the axial direction of the shaft member 51 in the cylindrical body 53 is disposed in the opening 53c. The guide plate 54 is formed in substantially the same shape as the opening 53 c, and the outer peripheral surface facing the side of the cutter member 52 is formed on a vertical surface 54 a that is in sliding contact with the inner peripheral surface of the cylindrical body 53. Yes. The guide plate 54 is formed with a plurality of cutouts 54b so that the guide plate 54 can move in the vertical direction without interfering with the plungers 57 mounted in the cylindrical body 53.

  Further, the lower end portion of the guide plate 54 is formed in a horizontal plane that contacts the outer peripheral surface 1 a of the fluid pipe 1, and is disposed so as to slightly protrude toward the fluid pipe 1 from the blade portion 53 a. At the upper end of the guide plate 54, a guide bar 55 is provided so as to pass through the cylindrical body 53 to above the cutter member 52, and the guide plate 54 is connected to the fluid pipe 1 around the guide bar 55. A coil spring 56 that biases toward the surface is disposed.

  For this reason, the cutter member 52 guides the inner peripheral surface of the opening 53c by moving the inside of the opening 53c in the axial direction of the shaft member 51 without interfering with the plunger 57 by the notches 54b. The guide member 54 moves relative to the guide plate 54 in the axial direction while being guided by the vertical surface 54 a of the plate 54.

  In order to cut the fluid pipe 1 using the casing 2, the support base 40, and the cutter member 52 configured as described above, first, as shown in FIGS. 1 and 3, the support base 40 in the second case 4. As described above, the flat surfaces 4j, 4k, and 4m are avoided and arranged on the inner bottom portion of the second case 4. At the same time, each fixing pin 6 is inserted into the insertion hole 40g, and the support base 40 is fixed so as not to be displaced by the fluid pressure of the fluid after the fluid pipe 1 is cut.

  Next, in the 1st case 3, the fitting space 22e of the attachment member 22 is unevenly fitted to the flange 3n. Furthermore, the mounting member 22 and the flange 3n are locked by the locking pin 21, so that the mounting member 22 is mounted so as not to move relative to the flange 3n. Thereafter, the attachment members 22 are similarly attached to the other flanges 3r, 4n, and 4r of the first case 3 and the second case 4.

  Next, as shown in FIGS. 1 and 2, the first case 3 to which the attachment member 22 is attached is disposed on the upper end of one end side of the fluid pipe 1 and the bypass pipe 12. And the 2nd case 4 is arrange | positioned from the downward direction with respect to the fluid pipe | tube 1 in the state which has arrange | positioned the water stop member 24 between the flanges 3c and 4c, and the fluid pipe | tube 1 is provided between both wall part 40h, 40h in the support stand 40. Deploy. Furthermore, the flanges 3c and 3c of the first case 3 and the flanges 4c and 4c of the second case 4 are opposed to each other, and the flanges 3c and 4c that are opposed to each other are tightened with bolts and nuts 25, whereby the casing 2 is fixed. Temporarily fixed to the fluid pipe 1 and the bypass pipe 12. By tightening the flanges 3c and 4c with bolts and nuts 25, the support portion 40a of the support base 40 abuts or approaches the outer peripheral surface 1a of the fluid pipe 1 from below.

  At this time, each water-stop member 20a, 20c and water-stop member 20b, 20d, the both ends in the circumferential direction of the water-stop members 20a, 20b are in close contact with the both ends in the circumferential direction of the water-stop members 20c, 20d, The water stop members 20a and 20c and the water stop members 20b and 20d are formed in an annular shape, and between the outer peripheral surface 1a and the contact portions 3a and 3a of the fluid pipe 1 and the outer peripheral surface 12a and the branching portion 2a of the bypass pipe 12. Seal the gap.

  Further, between the housing 2 and the fluid pipe 1 and the bypass pipe 12, the water stop member 24 is elastically deformed between the flanges 3c and 4c, so that the flanges 3c and 4c are formed on the water stop member 24 over substantially the entire length. The water stop members 20a are in close contact with each other between the contact portions 3a, 4a and the outer peripheral surface 1a of the fluid pipe 1 and between the half cylinder portions 3e, 4e and the outer peripheral surface 12a of the bypass pipe 12. The fluid pipe 1 is sealed by being in close contact over substantially the entire length of the outer peripheral surface 1a and the half cylinder portions 3e and 4e of the fluid pipe 1 and the outer peripheral surface 12a of the bypass pipe 12.

  Moreover, as shown in FIG.1 and FIG.9, between flat surface 3j and 4j is comprised as the continuous surface 2b which does not have discontinuous surfaces, such as a protrusion and a level | step difference. Similarly, the flat surfaces 3k and 4k and the flat surfaces 3m and 4m are also configured as continuous surfaces 2c and 2d, respectively.

  The fused portion 22 a of the attachment member 22 attached to each of the flanges 3 n and 4 n is in contact with the outer peripheral surface 1 a of the fluid pipe 1 over substantially the entire length in the circumferential direction of the fluid pipe 1. Similarly, the fused portion 22a of the attachment member 22 attached to the flanges 3r and 4r contacts the outer peripheral surface 12a of the bypass pipe 12 over substantially the entire length in the circumferential direction of the bypass pipe 12. Moreover, both the half cylinder parts 3e and 4e comprise the branch part 2a which branches toward the side of the housing | casing 2, when the flanges 3c and 3c and the flanges 4c and 4c are opposingly arranged.

  Next, a power cable connected to an external power source (not shown) is connected to the connection portion 23 of each mounting member 22 attached to the flanges 3n, 4n, and power is supplied from the external power source for a predetermined time. When the heated heating wire 22b is heated to a high temperature, the fused portion 22a made of a resin material and the outer peripheral surface 1a of the fluid pipe 1 are heated and gradually melted.

  The melted fused portion 22a and the outer peripheral surface 1a of the fluid pipe 1 are mixed with each other, and the heat generated by the heating wire 22b is stopped and integrated to solidify by lowering to room temperature. And fixed immovable.

  Further, the external power source is connected to the connection portion 23 of the attachment member 22 attached to the flanges 3r and 4r in the same manner as between the fusion portion 22a of the attachment member 22 attached to the flanges 3n and 4n and the outer peripheral surface 1a of the fluid pipe 1. And the connecting portion 23 is connected to cause the heating wire 22b to generate heat, so that the fusion bonding portion 22a and the outer peripheral surface 12a of the bypass pipe 12 are melted, and the heat generation of the heating wire 22b is stopped to be melted. 22a and the outer peripheral surface 12a of the bypass pipe 12 are integrated and solidified. Thus, the attachment of the housing 2 to the fluid pipe 1 is completed.

  Next, as shown in FIGS. 4 and 6, the upper case 35 in which the working valve 36 and the cutting device 50 are disposed is connected to the upper flange 3i of the branch port 3g in a watertight manner. The cutting device 50 includes a shaft member 51 connected to a driving means (not shown) and traveling in the axial direction toward the fluid pipe 1 in the branch port 3g, and the above-described cutter member 52 connected to the lower end portion of the shaft member 51. It is mainly composed. Among these, the upper case 35 is provided with an air valve (not shown) for venting air and a water pouring valve for water pouring.

  The cutting device 50 configured in this manner replaces the air in the housing 2 and the upper case 35 with water by injecting water through the water injection valve, and then the cutter member 52 is connected to the fluid pipe 1 through the shaft member 51. The lower end portion of the guide plate 54 is brought into contact with the outer peripheral surface 1 a at the upper end portion of the fluid pipe 1.

  Then, the cutter member 52 is continuously advanced in the axial direction of the shaft member 51, so that the cutter member 52 is continuously pressed against the outer peripheral surface 1 a of the fluid pipe 1 by the guide plate 54. The cutter member 52 fixes the position for cutting the fluid pipe 1 by the frictional force generated between the lower end of the plate 54 and the outer peripheral surface 1 a of the fluid pipe 1.

  Thereafter, the guide plate 54 and the cutter member 52 are advanced, so that the guide plate 54 stays at the position in contact with the outer peripheral surface 1 a of the fluid pipe 1 while receiving a biasing force from the coil spring 56. During this time, the tubular body 53 sequentially cuts the fluid pipe 1 downward by the blade portion 53a while the inner peripheral surface is in sliding contact with the vertical surface 54a.

  At this time, the fluid pipe 1 receives a pressing force from the cutter member 52 as the cutter member 52 cuts the fluid pipe 1 from the upper side to the lower side, but the support base 40 attaches the fluid pipe 1 to the cutter member 52. Since it is supported against the pressing force, it is temporarily deformed within a range where it can be elastically restored by the pressing force from the cutter member 52, but permanent deformation is prevented.

  Further, as the cutting of the fluid pipe 1 proceeds, the flow holes 53 b are arranged in the fluid pipe 1. For this reason, since the flow path of the fluid is secured by the flow hole 53b in the fluid pipe 1 being cut by the cutter member 52, a part of the fluid flowing in the fluid pipe 1 passes through the flow hole 53b. Thus, the turbulent flow generated by the fluid flowing through the cylindrical body 53 and coming into contact with the cylindrical body 53 and the fluid pressure received by the cylindrical body 53 from the fluid can be kept small.

  At this time, one end side of the rod body 57a of each plunger 57 passes through the notch 40j formed in the wall portion 40h downward along the vertical surface 40k, and then slides downward on the tapered surface 40m. Move towards. For this reason, the rod 57a moves while sliding the notch 40j in contact with the tapered surface 40m, so that the rod 57a slides toward the outside of the support base 40, which is the tube axis direction of the fluid pipe 1, and A biasing force is stored in the coil spring in the body 57b.

  Then, as shown in FIGS. 6 and 7, the portion cut by the cutting of the fluid pipe 1 by the blade portion 53a is cut off from the fluid pipe 1 to become a section 1b. At this time, each rod body 57a is disposed at a position facing the recessed portion 40n formed on the lower side of the tapered surface 40m in each wall portion 40h, and one end side thereof is urged by the urging force stored in the coil spring. It is inserted into the recessed portion 40n. The support base 40 is held in the cylindrical body 53 from both sides in the tube axis direction of the fluid pipe 1 by fitting one end side of each rod body 57a into the recessed portion 40n.

  Furthermore, the section 1b is brought into close contact with the inner peripheral surface 53c of the cylindrical body 53 in the opening 53c due to the elastic restoring force of the section 1b itself, and between the inner peripheral surface 53c of the cylindrical body 53. The cylindrical body 53 is housed and held by the frictional force generated by the above. That is, the slice 1b in the present embodiment is supported so as not to be detached from the support base 40 by both wall portions 40h, 40h erected on the support base 40 and the inner peripheral surface 53c of the cylindrical body 53. Thus, the inner peripheral surface 53c of the cylindrical body 53 in the present embodiment constitutes support means provided on the cutter member 52 together with the wall portions 40h and 40h.

  Next, the shaft member 51 is retracted, and the support base 40 on which the section 1b is arranged is moved from the inside of the housing 2 toward the upper case 35. At this time, the section 1b arranged on the support base 40 is supported by the wall portions 40h and 40h and the inner peripheral surface 53c of the cylindrical body 53 so as not to fall off from the support base 40 as described above. It moves toward the upper case 35 together with the support table 40 without fear of dropping off from the support table 40 due to fluid pressure or the like in the pipe 1.

  As shown in FIG. 1, the fixing pins 6 provided on the inner bottom portion of the second case 4 and the insertion holes 40 g formed in the leg portions 40 d and 40 f are both upward in the retraction direction of the shaft member 51. Therefore, the support base 40 can be easily separated from the inner bottom portion of the second case 4.

  Subsequently, after the section 1b and the support base 40 are recovered from the housing 2 by continuously retracting the shaft member 51 toward the upper case 35, the work valve 36 is slid to move the housing 2 watertight. In addition, the cutter member 52 and the section 1b collected from the housing 2 and the support base 40 are removed from the upper case 35, and the cutting of the fluid pipe 1 by the cutting device 50 is completed.

  After removing the cutter member 52, the slice 1 b and the support base 40 from the upper case 35, as shown in FIGS. 8 and 9, the fluid control installation device 60 is attached to the housing 2, and the fluid control is installed in the housing 2. 11 is installed. As described above, the fluid control installation device 60 includes the housing 2 attached to the fluid pipe 1, the shaft member 51, and the fluid control 11 that is fixedly installed at the tip of the shaft member 51 and inserted into the housing 2. And an upper case 35 that accommodates the fluid control 11.

  Among these, the fluid control 11 is mainly composed of a valve box 13 and a valve main body (not shown) that is pivotally supported by a pivot 15 that faces in the vertical direction in the valve box 13. In the upper part of the valve box 13, an annular annular seal portion 16 a that can be in close contact with the entire circumference of the circumferential surface 3 h of the housing 2 is formed. Further, the valve box 13 is provided with a seal portion 16b that can be brought into close contact with the entire length of the flat surfaces 3j and 4j and extends downward from the annular seal portion 16a.

  Similarly to the seal portion 16b, the valve box 13 includes a seal portion 16c that can be in close contact over the entire length of the flat surfaces 3k and 4k and a seal portion 16d that can be in close contact over the entire length of the flat surfaces 3m and 4m, respectively. It extends downward from the portion 16a. The seal portions 16b, 16c, and 16d intersect at the bottom of the valve box 13 in a horizontal manner.

  On the other hand, the valve main body rotates the pivot 15 so that the valve body 13 slides in contact with the inner wall of the valve box 13 while the fluid pipe 1 is upstream and downstream, or the fluid pipe 1 is upstream. It is possible to selectively communicate with the bypass pipe 12.

  In order to insert and arrange the control fluid 11 configured in this way into the housing 2, the housing 2 is opened by sliding the work valve 36, as shown in FIGS. The inner and upper cases 35 are filled with fluid. Then, after closing the water injection valve, the shaft member 51 in which the fluid control 11 is fixed at the tip is advanced toward the inside of the housing 2. At this time, the pivot operating portion 15 a is inserted and disposed in the distal end portion of the shaft member 51.

  By causing the shaft member 51 to advance toward the inside of the housing 2, the annular seal portion 16 a is brought into close contact with the entire circumference of the circumferential surface 3 h of the housing 2. At the same time, the flat surfaces 3j and 4j and the seal portion 16b, the flat surfaces 3k and 4k and the seal portion 16c, and the flat surfaces 3m and 4m and the seal portion 16d are brought into close contact with each other, and the valve box 13 and the housing 2 are kept watertight. By doing so, the fluid control 11 is inserted into the housing 2. Since the support base 40 is disposed on the inner bottom portion of the second case 4 while avoiding the flat surfaces 4j, 4k, 4m when the fluid pipe 1 is cut, the support base 40 is applied to the flat surfaces 4j, 4k, 4m. The flat surface 4j and the seal portion 16b, the flat surface 4k and the seal portion 16c, and the flat surface 4m and the seal portion 16d can be satisfactorily adhered without forming scratches or irregularities due to contact.

  After the fluid control 11 is inserted and arranged in the housing 2, the fluid in the upper case 35 is drained, and then the operator puts a hand through an operation port (not shown) provided in the upper case 35, whereby the shaft member 51. Remove the fluid control 11 from Finally, after removing the upper case 35 from the housing 2, the lid body 17 is disposed on the upper flange 3 i, and the lid body 17 and the upper flange 3 i are tightened with the bolts and nuts 18. The lid body 17 is formed with a through hole 17a penetrating in the vertical direction, and the pivot operation section 15a is inserted into the through hole 17a so that the pivot operation section 15a is located above the lid body 17. Protrusively arranged.

  By tightening the lid body 17 and the upper flange 3i with bolts and nuts 18, the control fluid 11 is pressed downward by the lid body 17, and the circumferential surface 3h, the annular seal portion 16a, the flat surfaces 3j, 4j And the seal portion 16b, the flat surfaces 3k and 4k, the seal portion 16c, the flat surfaces 3m and 4m, and the seal portion 16d are more securely adhered to each other, and the damping fluid 11 is fixed in the casing 2, and the casing of the damping fluid 11 is fixed. The insertion arrangement in 2 is finished.

  In this embodiment, the fluid pipe 1 is cut by the cutter member 52 while the fluid pipe 1 is supported from below by the support base 40 in the housing 2, and then the support base 40 is collected from the housing 2. When the fluid pipe 1 has a plurality of cutting points, the recovered support base 40 is installed in the second case 4 attached to the cutting position of the new fluid pipe, so that the fluid can be repeatedly used by the same support base 40. The fluid pipe 1 can be supported when the pipe 1 is cut.

  Thereafter, when the operator attaches a handle or the like to the pivot operating portion 15a and rotates the valve body, the fluid control 11 passes through the fluid flow path formed from the upstream side to the downstream side of the fluid pipe 1. The fluid pipe 1 can be switched to communicate with the bypass pipe 12 from the upstream side.

  As described above, in the method for cutting the fluid pipe 1 in the present embodiment, the support base 40 is disposed on the side of the fluid pipe 1 facing the cutter member 52 in the housing 2 and is supported by the support base 40. After cutting the fluid pipe 1 in a range including the existing portion by the cutter member 52, the support base 40 is held by using the plunger 57, and the support base 40 is housed together with the section 1 b generated by cutting the fluid pipe 1. 2, the support base 40 receives the force by which the cutter member 52 presses the fluid pipe 1 in order to cut the fluid pipe 1, and suppresses deformation of the fluid pipe 1 when the fluid pipe 1 is cut. In addition, since the section 1b can be collected together with the support base 40 by holding the support base 40 with the plunger 57, the fluid control in the housing 2 can be performed while the support base 40 can be reused. 1 It can be installed inhibition without the.

  Further, since the plunger 57 is provided on the cutter member 52, the support base 40 can be held by the plunger 57 in a state in which the fluid pipe 1 is cut by the cutter member 52. Therefore, the cutter member 52 and the plunger While the 57 is compact and simple, the fluid pipe 1 can be cut and the section 1b and the support base 40 can be recovered from the housing 2 with a small number of steps.

  Further, since the cutter member 52 is provided with an inner peripheral surface 53c as a supporting means for supporting the section 1b collected from the inside of the housing 2, the section 1b is cut after the fluid pipe 1 is cut by the cutter member 52. Since it can be made to support on the support stand 40, the position shift of the section | slice 1b in the support stand 40 can be suppressed at the time of collection | recovery.

  Further, since the support base 40 is provided with a wall portion 40h as a support means for supporting the section 1b collected from the inside of the housing 2, the support base 40 has a simple configuration in which 40h is provided. The section 1b can be supported.

  Further, the support base 40 is locked to the housing 2 by a plurality of fixing pins 6 that can be removed in the retreating direction of the cutter member 52, so that the support base 40 can be fluidized by the fixing pins 6. Since it can be fixed in the housing 2 against the fluid pressure, the position of the section 1b caused by the cutting of the fluid pipe 1 is prevented from shifting, and the plunger 57 retreats while holding the section 1b. As a result, the locking of the support base 40 to the housing 2 by the fixing pin 6 is released, so that the support base 40 can be easily recovered from the housing 2.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the embodiment, the fluid pipe 1 is cut by moving the cutter member 52 from the upper case 35 toward the housing 2, and the support base 40 is held in the cylindrical body 53 by the plunger 57. In this state, the cutter member 52 is retracted toward the upper case 35 to collect the slice 1b and the support base 40. However, a holding means for holding the support base 40 is separately prepared to hold the slice 1b. The holding means is prepared separately from the cutter member 52, and the cutter member 52 is advanced from the inside of the upper case 35 toward the inside of the housing 2 so that the fluid pipe 1 is cut and then retracted into the upper case 35. The holding means is advanced from the inside of the upper case 35 toward the inside of the housing 2 to cause the holding means to hold the support base 40, and the holding means holding the support base 40 is removed from the inside of the housing 2. By causing regression toward the section case 35 Sections 1b and the support base 40 may be recovered from within the housing 2.

  In the above embodiment, the section 1b generated by cutting the fluid pipe 1 is supported on the support base 40 using the wall 40h of the support base 40 and the inner peripheral surface 53c of the cylindrical body 53 as support means. However, the section 1b may be supported on the support base 40 by only one of the wall 40h and the inner peripheral surface 53c.

  In the above embodiment, the section 1b generated by cutting the fluid pipe 1 is supported on the support base 40 using the wall 40h of the support base 40 and the inner peripheral surface 53c of the cylindrical body 53 as support means. However, when the section 1b is sufficiently stably disposed on the support base 40, the section 1b and the support base 40 may be recovered from the housing 2 without using these support means.

  Moreover, in the said Example, after arrange | positioning the support stand 40 in the 2nd case 4, after tightening the 1st case 3 and the 2nd case 4 with the volt | bolt and nut 25 with the flanges 3c and 4c, a support stand 40 support portions 40a are brought into contact with or close to the outer peripheral surface 1a of the fluid pipe 1 from below, but when the housing 2 has a sufficiently large dimension with respect to the support base 40, the fluid pipe 1 A support base 40 is disposed from above in a housing 2 that is hermetically attached to the housing 2, and the arrangement position of the support base 40 is adjusted in the housing 2, so that the support portion 40 a of the support base 40 is placed on the outer periphery of the fluid pipe 1. You may contact | abut or adjoin to the surface 1a from the downward direction.

  Further, in the above embodiment, the fluid control 11 is constituted by the valve box 13 and a valve body (not shown), and the flow path of the fluid is switched by moving the valve body in the valve box 13. The fluid may be composed of, for example, a gate valve, a butterfly valve, an emergency shut-off valve, or a plug, and closes only the fluid flow path by closing only one of the upstream side and the downstream side of the fluid pipe 1. You may do it.

  Moreover, in the said Example, although the housing | casing 2 was attached to the fluid pipe | tube 1 by heat-seal | fitting the attachment member 22 with respect to the fluid pipe | tube 1, the blade part which faces the internal diameter side of the fluid pipe | tube 1 to the housing | casing 2 is provided. The housing 2 may be attached to the fluid pipe 1 by arranging a plurality of latching bodies and pressing the latching body so that the blade portion bites into the outer peripheral surface 1 a of the fluid pipe 1.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 1b Section 2 Case 6 Fixing pin (locking means)
11 Fluid control 40 Support base 40h Wall (supporting means)
52 Cutter member 53 Tubular body 53c Inner peripheral surface (supporting means)
57 Plunger (holding means)

Claims (5)

In a casing that is hermetically attached to the fluid pipe, the fluid control is performed by cutting the fluid pipe in an uninterrupted state by advancing the cutter member in the radial direction of the fluid pipe, and controlling the flow of fluid in the casing. A fluid pipe cutting method for installing
A support base is disposed on the side of the fluid pipe facing the cutter member in the casing, and the support pipe is cut by the cutter member in a range including a portion supported by the support base. A method of cutting a fluid pipe, wherein the support is recovered from the housing together with a section generated by cutting the fluid pipe by holding the holding means.   The fluid pipe cutting method according to claim 1, wherein the holding unit is provided on the cutter member.   3. The fluid pipe cutting method according to claim 2, wherein the cutter member is provided with support means for supporting the section collected from the housing.   The fluid pipe cutting method according to any one of claims 1 to 3, wherein a supporting means for supporting the section collected from the housing is provided on the support base.   The said support stand is latched with respect to the said housing | casing by the some latching means which can be removed toward the retraction direction of the said cutter member, The Claim 1 thru | or 4 characterized by the above-mentioned. Cutting method of fluid pipe.

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