JP4717409B2 - Rust prevention method for the cutting edge in the installation work of the insert - Google Patents

Description

  The present invention cuts and removes a part of an existing fluid pipe, for example, a water pipe, and installs an existing fluid pipe, such as a fluid control valve, a branch pipe, a flow meter, or a hydroelectric generator, at the cut position. The present invention relates to a method for preventing rust at a cutting edge.

  Conventionally, when installing a fluid control valve or the like in an existing fluid pipe line, a pair of fixed connection rings are installed on the pipe circumferential surface corresponding to both sides of the place where the fluid control valve of the fluid pipe is installed, and then these fixed connections Covering the installation location of the fluid control valve including the ring with a sealed case, and cutting the installation location of the fluid control valve in the case with a cutting machine, then the cut end surface on the fixed connection ring side in the cut portion A fluid control valve fitted with a retractable elastic joint ring holding a seal material in contact with the fluid is inserted in a contracted state, and then the telescopic joint ring is extended in the tube axis direction to the fixed connection ring. The seal material was pressed against the cut end face while being watertightly engaged to prevent rust (see Patent Document 1).

Japanese Patent No. 2649426

  However, in Patent Document 1, an elastic joint ring is used for watertightly engaging a fixed connection ring and an expansion joint ring and moving the expansion joint ring in the direction of the cut end face to press the seal member against the cut end face. The extruding screw screwed to the flange portion of the outer ring that is a part of the outer ring is pushed, and the expansion joint ring is moved in the direction of the cut end surface by contacting the flange portion of the inner ring fixed to the fluid control valve, Since the expansion joint ring is extruded based on the fluid control valve, if the fluid control valve moves in the direction of the pipe axis due to water pressure or ground fluctuation during or after installation, the pressure bonding of the sealing material will be weakened and rust prevention will occur. There was a difficulty that the effect fell.

  The present invention has been made paying attention to such problems, and provides a cut-out rust prevention method that does not deteriorate the rust prevention effect even when an insert such as a fluid control valve attached to an existing fluid pipe moves. The purpose is that.

In order to solve the above-mentioned problem, the cutting opening rust prevention method in the installation work of the insert according to claim 1 of the present invention is characterized in that a sealing member that is in contact with the end face of the existing fluid pipe is connected to the cutting opening contact portion. Rust cut rust prevention in construction where an insertion body in which the expansion joint provided on the cylinder is movably attached to the cylindrical skirt is cut to a predetermined length and removed from the existing fluid pipe. In the method, the joint bodies are respectively attached to the peripheral surfaces of the existing fluid pipes on both sides of the insertion body to be installed, and a part of the existing fluid pipe between the joint bodies is cut and removed by a predetermined length with a cutting machine, The insertion body is inserted into the cut portion, a pressing member constructed across the insertion body is attached to the two expansion joint bodies, and the two expansion joint bodies are attached to the two cutting port sides of the existing fluid pipe by the pressing member. It is extended and engaged with the joint body in a watertight manner, and at the same time, cut ends of both expansion joint bodies It is characterized in that to press closely the sealing member on both cutting opening end face of the existing fluid pipe by the contact portion.
According to this feature, the expansion joint body is pressed in the direction away from each other by the pressing member provided across the insertion body, the sealing member is in close contact with the cut opening, and the relative movement with respect to the insertion body is performed. Because it is attached, the existing fluid pipe on the opposite side of the cutting opening that prevents rust serves as a reaction force receiving part, and even if the inserted body moves, the seal member can be brought into close contact without being affected by the movement Rust prevention effect does not fall.

Further, the pressing member is composed of a rod body in which screws are formed at least at both end portions, and an inner nut and an outer nut that are screwed into the screw with the collar portion of the expansion joint body interposed therebetween, and Has an effect.

The cutting opening rust prevention method in the installation work of the insert according to claim 2 of the present invention is the cutting opening rust prevention method in the installation work of the insertion body according to claim 2, wherein the expansion joint body is a pipe. While the collar part which protruded in the outer peripheral direction is formed, the press member is provided in the collar part, It is characterized by the above-mentioned.
According to this feature, since the pressing member is attached to the flange portion protruding outward, it is possible to reliably avoid interference between the insert and the pressing member. The seal member can be brought into close contact with each other, and can be stably adhered and rust-proof without being affected by the movement of the insert.

The cutting opening rust prevention method in the installation work of the insert according to claim 4 of the present invention is the cutting opening rust prevention method in the installation work of the insertion body according to claim 1 , wherein the existing fluid of the expansion joint body is provided. The facing surface of the cutting hole contact portion facing the pipe cutting port is formed in a shape that follows the existing fluid pipe cutting port, and the seal member is attached in a shape that follows the existing fluid pipe cutting port. It is a feature.
According to this feature, the surface of the expansion joint body that faces the existing fluid pipe cutting port and the sealing member are formed and attached in a shape that follows the existing fluid pipe cutting port. Can be made to adhere evenly, and the rust prevention effect can be kept high and uniform.

  Examples of the present invention will be described below.

  FIGS. 1 to 7 show an embodiment of the present invention. FIG. 1 (a) is a side view showing a state in which a fluid control valve as an insert is installed in an existing fluid pipe in the rust prevention method according to the present invention. FIG. 2B is a front view of FIG. 2 is a side view including the AA cross section of FIG. 1B, and FIG. 3 is a partial enlarged cross-sectional view of the joint body and the expansion joint body. 4 to 7 show the procedure of the rust prevention method, FIG. 4 is a cross-sectional view showing the fluid pipe cut and removed at a predetermined position, and FIG. 5 is a cross-sectional view showing a state where the joint body is installed at the predetermined position. It is. FIG. 6 is a cross-sectional view showing a state in which a fluid control valve having an expansion joint body attached to a cut portion is temporarily placed, and FIG. 7 shows a state in which the expansion joint body is moved and a seal member is brought into close contact with the end face of the cut opening. It is sectional drawing. 8A and 8B show another embodiment of the present invention, in which FIG. 8A is a perspective view showing a state in which the fluid pipe is cut and removed by a hole saw cutter, and FIG. 8B is a cut according to the cutting port shape of another embodiment. It is a perspective view of the expansion joint body which formed the port contact part. In each figure, the valve body of the fluid control valve is omitted.

  Reference numeral 1 shown in FIGS. 1 and 2 denotes an existing fluid pipe, and a fluid control valve 2 is inserted and installed at a predetermined position of the fluid pipe 1 by a joint body 3, an expansion joint body 4 and a pressing member 5.

  The joint body 3 is disposed opposite to the lower joint body 3a on the outer periphery of the upper surface with the fluid pipe 1 sandwiched between the lower joint body 3a formed in a semicircular arc shape having a predetermined length attached to the outer periphery of the lower surface of the fluid pipe 1. The lower joint body 3a is sandwiched between a semicircular upper joint body 3b, a circumferential packing 3c for measuring water tightness between the joint body 3 and the fluid pipe 1, and coupling flanges 3d and 3e between the lower joint body 3a and the upper joint body 3b. And a flange packing (not shown) for watertightly joining the upper joint body 3b.

  The coupling flanges 3d and 3e are formed so as to protrude outward on the opposing end surfaces of the lower joint body 3a and the upper joint body 3c. Assembled.

  As shown in FIGS. 2 and 3, the assembled joint body 3 is attached in a cylindrical shape in which one end is watertight to the fluid pipe 1 and the other fluid control valve 2 side is open. A tapered portion 3g that is inclined outward is formed on the inner peripheral surface of the open end portion, and on the opposite side of the fluid control valve 2, there is a packing accommodating portion 3f that accommodates the circumferential packing 3c. It is formed.

  The expansion joint body 4 is formed in an integral cylindrical shape, and is attached to sleeve portions 2a formed in a cylindrical shape on both sides of the fluid control valve 2 so as to be watertight and extendable by packing.

  On the inner surface of the expansion joint 4 on the fluid control valve 2 side, an inner packing accommodating portion 4b is provided in which an inner packing 4a for measuring water tightness with the sleeve portion 2a of the fluid control valve 2 is disposed.

  An insertion portion 4f is formed at the tip of the expansion joint body 4 on the side away from the fluid control valve 2, and is inserted into the gap between the joint body 3 and the fluid pipe 1 in a watertight manner. An outer packing accommodating portion 4d for arranging an outer packing 4c for measuring water tightness is provided.

  On the base inner diameter side of the insertion portion 4f, a cutting port abutting portion 4e facing the cutting port end surface 1a of the fluid pipe 1 protrudes, and the facing surface 4i facing the cutting port end surface 1a has a shape of the cutting port end surface 1a. The seal member 6 is provided to prevent rust in accordance with the shape of the cut end face 1a. The wall thickness of the cutting hole abutting portion 4 e is substantially the same as or slightly larger than the thickness of the fluid pipe 2, and the seal member 6 is also provided with a thickness larger than the thickness of the fluid pipe 2. The seal member 6 is made of rubber, synthetic resin, or the like that has elasticity and is in close contact with the cut end surface 1a. The cutting port abutting portion 4e is formed in accordance with the cutting shape of the fluid pipe 1. When the fluid pipe 1 is cut perpendicularly to the pipe axis, it is formed perpendicularly. It is formed diagonally according to the angle.

  A flange portion 4g protruding outward in the tube diameter direction is provided on the outer diameter side of the base portion of the insertion portion 4f. The flange portion 4g is provided with four through holes 4h through which the pressing member 5 is attached. It has been.

  The pressing member 5 includes a rod-like screw body 5a and an inner nut 5b on the fluid control valve 1 side that is screwed into the screw body 5a with a flange 4g interposed therebetween, and an outer nut 5c on the anti-fluid control valve 1 side. . The screw body 5a may be a rod body in which screws are formed at both ends.

  Next, a method for preventing rust at the cut end of the fluid pipe 1 in the installation work of the fluid control valve 2 will be described in the order of steps.

  First, as shown in FIG. 4, a predetermined position of the fluid pipe 1 is cut and removed to a predetermined length by a pipe cutting machine (not shown). The length to be cut is set slightly larger than the length in the tube axis direction of the fluid control valve 2 in which the expansion joint body 4 is attached to both sleeve portions 2a in a contracted state.

  Next, as shown in FIG. 5, the joint body 3 is divided into two at predetermined positions on both sides of the cut portion of the fluid pipe 1, and the lower joint body 3a and the upper joint body 3b in which the circumferential packing 3c and the flange packing are arranged are fluidized. The pipe 1 is attached so as to be sandwiched from above and below, the coupling flanges 3d and 3e are fastened with bolts and nuts, and the openings are faced to each other.

  Next, as shown in FIG. 6, the expansion joint 4 in which the inner packing 4a is disposed in the inner packing accommodating portion 4b and the outer packing 4c is disposed in the outer packing accommodating portion 4d is attached to both sleeve portions 2a in a contracted state. The control valve 2 is inserted into the position where the fluid pipe 1 is cut and removed, with the core of the fluid pipe 1 and the shaft aligned, and temporarily placed so as not to rotate or move.

  With the fluid control valve 2 temporarily placed, an inner nut 5b is screwed into the opposing through hole 4h of the flange portion 4g of the left and right expansion joint bodies 4, and the screw disposed on the flange 4g side of the fluid control valve 2 The body 5a is inserted, the left and right expansion joint bodies 4 are installed across the fluid control valve 2, and the outer nut 5c is screwed. After the four pressing members 5 are attached at predetermined positions, the outer nut 5c of each pressing member 5 is loosened to the anti-fluid control valve 2 side, the inner nut 5b is tightened to the anti-fluid control valve 2 side, and the inner nut 5b is By tightening, the expansion joint body 4 is slid and moved away from the fluid control valve 2. Since the flange portion 4g is provided so as to protrude outward from the outer diameter of the pipe, the pressing member 5 spanned between the two expansion joint bodies 4 does not interfere with the fluid control valve 2.

  Since the seal member 6 is in close contact with the cut end face 1a, rust is prevented from being generated from the cut end face 1a, and the expansion joint 4 is attached to the sleeve 2a so as to be relatively movable and the fluid control valve 2 Therefore, even if the fluid control valve 2 moves in the tube axis direction, the seal member 6 adheres without being affected by the movement.

  In this embodiment, as shown in Patent Document 1, if the joint body 3 and the fluid control valve 2 are housed in a sealed case, the fluid control valve 1 can be installed in an uninterrupted state. I can do it.

  First, the joint body 3 is attached to predetermined positions on both sides of the place where the fluid control valve 2 of the fluid pipe 1 is installed, and a sealed case in which both joint bodies 3 are housed is installed. A working valve and a pipe cutting machine are attached to the upper part of the sealed case, the working valve is opened, the pipe cutting machine is lowered into the sealed case, and the fluid pipe 1 is cut. Pull up the tube cutter to collect the section and close the working valve.

  Next, the expansion joint body 4 is attached to the sleeves 2a in a contracted state, and an insertion machine containing the fluid control valve 2 is mounted on the work valve. After the work valve is opened, the fluid pipe 1 is cut and removed. The fluid control valve 2 is inserted with the tube core and axis of the fluid pipe 1 aligned with each other, and temporarily placed so as not to rotate or move.

  Next, the expansion joint bodies 4 on both sides of the fluid control valve 2 are extended from the outside of the sealed case, and are joined to the joint body 3 in a watertight manner. At this stage, the fluid pipe 1 and the fluid control valve 2 are joined in a watertight manner by the inner packing 4a, the outer packing 4c, and the circumferential packing 3c.

  Since the fluid pipe 1 and the fluid control valve 2 are joined in a watertight manner, the insertion machine, work valve, and sealing case are removed.

  In the subsequent steps, the fluid control valve 2 can be inserted and installed in the fluid pipe 1 in the state of uninterrupted water by performing the same operation as in the above embodiment, and the cut end face 1a can be rust proof.

  FIG. 8 is an example of another shape of the cutting hole abutting portion 4e of the expansion joint body 4. FIG. 8A is a perspective view showing a state in which the fluid pipe 1 is cut and removed by a hole saw cutter, and FIG. It is a perspective view of the expansion joint body 4 which formed the cutting hole contact part 4e which followed the shape of the cutting hole end surface 1a of the fluid pipe | tube 1 of a).

  When the fluid pipe 1 is cut with a hole saw type cutter, the cutting opening is recessed at the top and bottom of the pipe, and both side parts are formed in convex curved surfaces. When the cut-out contact portion 4e of the expansion joint 4 is formed following the curved surface of the fluid pipe 1, the tube top portion and the tube bottom portion are convex, and both side portions are concave curved surfaces. A seal member 6 is attached along the line.

  Since the cut-out contact portion 4e of the expansion joint body 4 is formed in a shape following the shape of the cut-out end face 1a of the fluid pipe 1, and the seal member 6 is attached along the cut-out contact portion 4e. It can be brought into close contact with the cut end face 1a with an equal pressure, and the rust prevention effect is high and can be kept homogeneous.

  While the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to this. The specific configuration is not limited to these embodiments, and modifications and additions within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the above embodiment, the fluid control valve has been described as the insert, but a flow meter, a branch pipe, or a hydroelectric generator may be used.

  Moreover, in the said Example, although it performed using the press member 5 to move the expansion joint body 4, the movement of the expansion joint body 4 is performed with an auxiliary | assistant moving apparatus, and the state where the expansion joint body 4 presses mutually is carried out. You may use the press member 5 for maintaining.

  Moreover, in the said Example, although the joint body 3 was 20%, it may be 30% or more, and the joining performed with the volt | bolt and the nut may be performed by welding.

The state (a) which shows the state which installed the fluid control valve in the fluid pipe | tube in one Example of this invention is a side view, (b) is a front view. It is a side view containing the AA cross section of FIG.1 (b). It is a partial expanded sectional view of a joint body and an expansion joint body. It is sectional drawing which shows the state which cut | disconnected and removed the predetermined position of the fluid pipe | tube. It is sectional drawing which shows the state which installed the coupling body in the predetermined position of the fluid pipe | tube. It is sectional drawing which shows the state which temporarily placed the fluid control valve with which the expansion joint body was mounted | worn at the cutting | disconnection location. It is sectional drawing which shows the state which moved the expansion joint body and made the sealing member contact | adhere to the end surface of a cutting opening. (A) is a perspective view which shows the state which cut | disconnected and removed the fluid pipe | tube with the hole saw type cutter, (b) is a perspective view of the expansion joint body which formed the cutting hole contact part according to the cutting hole shape of another Example.

Explanation of symbols

1 Fluid pipe (existing fluid pipe)
1a End face 2 of cutting port Fluid control valve (insert)
2a Sleeve part 3 Joint body 3a Lower joint body 3b Upper joint body 3c Circumferential packing 3d Coupling flange 3e Coupling flange 3f Packing accommodating part 3g Taper part 4 Expansion joint body 4a Inner packing 4b Inner packing accommodating part 4c Outer packing 4d Outer packing accommodating part 4e Cutting port contact portion 4f Insertion portion 4g Collar portion 4h Through hole 4i Opposing surface 5 Press member 5a Screw body 5b Inner nut 5c Outer nut 6 Seal member

Claims (4)

An insertion body in which an expansion joint having a seal member that is in contact with the end face of the existing fluid pipe at the cut opening abutting portion is movably attached to the cylindrical skirt is attached to a part of the existing fluid pipe. Is cut at a predetermined length and removed at the cut portion, and a cut-out rust prevention method is provided. After cutting and removing a part of the existing fluid pipe between the bodies to a predetermined length, the insertion body is inserted into the cut portion, and the pressing member laid across the insertion body is attached to the two expansion joint bodies. Attach and extend both expansion joint bodies to the two cut opening sides of the existing fluid pipe by the pressing member so as to be watertightly engaged with the joint body, and the seal member is installed by the cut opening contact portion of both expansion joint bodies. Insertion characterized by being pressed and in close contact with both end faces of the fluid pipe Cutting opening rust method in the installation work.   The cut-out rust prevention method in the installation work of the insertion body according to claim 1, wherein the expansion joint body is formed with a flange portion protruding in a pipe outer peripheral direction and a pressing member is provided on the flange portion.   The insertion according to claim 2, wherein the pressing member includes a rod body in which screws are formed at least at both ends, and an inner nut and an outer nut that are screwed into the screw with a collar portion of the expansion joint body interposed therebetween. Anti-corrosion method for cuts in body installation   The facing surface of the cutting port abutting portion that faces the existing fluid pipe cutting port of the expansion joint body is formed in a shape that follows the existing fluid pipe cutting port, and the sealing member has a shape that follows the existing fluid pipe cutting port. The rust prevention method of the cut in the installation work of the insertion body of Claim 1 attached to.

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