JP2013130253A - Fluid pipe drilling rust preventing method and fluid pipe drilling rust preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pipe drilling method and a fluid pipe drilling rust preventing device, by which a drilled hole with high dimensional accuracy can be easily drilled in a fluid pipe, a load to a cutting edge of a cutting tool is averaged, durability of the cutting tool is improved, and deterioration of rust prevention effect is prevented by maintaining an adherence state between a cutting groove and a rust prevention tool.SOLUTION: The fluid pipe drilling rust preventing method, by which a drilled hole 1c is drilled to the fluid pipe 1 by an end mill 9b for installation of a valve body 14 provided inside a valve housing 13 capable of closing a flow in the fluid pipe 1 in a continuous water flow state, and the drilled hole 1c is made rustproof, has a process of forming the drilled hole 1c penetrating in a circumferential direction in a substantially rectangular shape in a plane view at a part of the fluid pipe 1 by undergoing a feeding process of parallel-shifting the end mill 9b provided at a front edge of a shaft member 9a rotating around the shaft in a cross direction of the fluid pipe 1, a process of feeding by parallel-shifting a rust prevention tool 15 in the cross direction of the fluid pipe 1 toward the drilled hole 1c in the same direction as in the feeding process of the end mill 9b, and a process of maintaining the rust prevention tool 15 while being in contact with the drilled hole 1c.

Description

  In the present invention, in order to install a valve body provided in a valve housing capable of closing a flow in a fluid pipe in the fluid pipe in a state of uninterrupted flow, a perforation is made in the fluid pipe by an end mill and the perforation is prevented. The present invention relates to a rust preventive method for fluid pipe drilling and a rust preventive device for fluid pipe drilling.

  A conventional fluid pipe drilling rust prevention device surrounds a part of an existing pipe (fluid pipe) in an airtight state by a sealed case (housing), and a cutting groove is cut in the sealed case. The inside of the existing pipe is sealed by fitting a rust preventive tool formed slightly larger than the cutting groove (see, for example, Patent Document 1).

Japanese Patent No. 4516666 (pages 7, 8 and 13)

  However, in Patent Document 1, since the heavy sealed case is rotated in the circumferential direction of the fluid pipe in a state where the cutting tool to be rotated is attached, a cutting groove with high dimensional accuracy is formed. In addition to precise center alignment and a large sealed case drive device, the end shape (opening angle of the end portion) of the cutting groove changes according to the amount of rotation of the sealed case in the circumferential direction with respect to the fluid pipe. For this reason, additional work such as reworking the shape of the end of the cutting groove in accordance with the shape of the installation portion of the valve element is required, and there is a problem that it takes time and labor to form the cutting groove.

  Furthermore, liquid (fluid) flows out from the cutting groove into the sealed case during the rust preventive tool mounting step, and the rust preventive tool is fitted into the cutting groove in the liquid outflow state. For this reason, the rust preventive tool has a problem that the pressure from the flowing liquid is applied and the close contact state between the cutting groove and the rust preventive tool cannot be maintained, and the rust preventive effect is lowered.

  The present invention has been made paying attention to such a problem, and can easily perforate a fluid pipe with high dimensional accuracy, and the load on the cutting blade of the cutting tool is averaged. An object of the present invention is to provide a fluid pipe drilling method and a fluid pipe drilling rust preventive device that improve the durability of the pipe and prevent the deterioration of the rust prevention effect by maintaining the close contact state between the cutting groove and the rust preventive tool. And

In order to solve the above problems, the fluid pipe drilling rust prevention method of the present invention is:
In order to install the valve body provided inside the valve housing capable of closing the flow in the fluid pipe in the fluid pipe in an uninterrupted flow state, the fluid pipe is perforated in the fluid pipe by an end mill, and the perforation is prevented from rusting. A drilling rust prevention method,
Through a feed step of translating an end mill provided at the tip of a shaft member rotating around the axis in the transverse direction of the fluid pipe, a perforation penetrating in a circumferential direction having a substantially rectangular shape in top view is formed in a part of the fluid pipe. Holding the rust preventive tool in contact with the perforation, and a step of translating the rust preventive tool in the same direction as the end mill feeding process in the transverse direction of the fluid pipe toward the perforation. It has the process to perform.
According to this feature, since the end mill is merely translated in the transverse direction of the fluid pipe, the drilling operation can be performed easily and accurate dimensional accuracy of the cutting groove can be obtained. Further, since the part of the end mill that cuts the fluid pipe is displaced in the axial direction of the end mill during translation, the load on the cutting blade of the end mill is averaged, and the durability of the end mill is improved. In addition, since the mechanism for inserting the rust preventive tool can be installed in a nearby casing in which a perforation is formed, the rust preventive tool can be accurately abutted and held on the perforation, and the rust preventive tool can be attached to the casing. Since the rust preventive tool can be sent out for drilling immediately after retreating the end mill, the work time until the rust preventive tool is attached to the apparatus and attached to the drill can be shortened. .

The fluid pipe drilling rust prevention method of the present invention is
In addition to the step of holding the rust preventive tool in contact with the perforations, the method further comprises the step of holding the rust preventive tool in contact with the perforations in a state of being spread toward the perforated wall surface. .
According to this feature, since the rust preventive tool is held in a state where the rust preventive tool is in contact with the perforation and is spread over the perforated wall surface, the tight contact between the perforated wall surface and the rust preventive tool can be reliably maintained, and the A decrease in the rust effect can be prevented.

The fluid pipe drilling rust prevention device of the present invention is
A housing that is attached to the fluid pipe in a sealed manner, and a rust preventive tool that is fitted into a perforation drilled in the fluid pipe by a drilling means that proceeds through an opening of the housing and prevents the perforation. A fluid pipe drilling rust prevention device comprising:
The drilling means translates an end mill provided at the tip of a shaft member rotating around an axis in the transverse direction of the fluid pipe, thereby penetrating a part of the fluid pipe in a circumferential direction having a substantially rectangular shape when viewed from above. The drilling means to be formed;
A rust preventive tool insertion mechanism for holding the rust preventive tool in a state of being parallelly moved in the transverse direction of the fluid pipe toward the perforation in the same direction as the feeding process of the end mill, and holding the rust preventive tool in contact with the perforation. It is characterized by becoming.
According to this feature, since the end mill is merely translated in the transverse direction of the fluid pipe, the drilling operation can be performed easily and accurate dimensional accuracy of the cutting groove can be obtained. Further, since the part of the end mill that cuts the fluid pipe is displaced in the axial direction of the end mill during translation, the load on the cutting blade of the end mill is averaged, and the durability of the end mill is improved. In addition, since the mechanism for inserting the rust preventive tool can be installed in the casing near the perforation position, the rust preventive tool can be easily held in contact with the perforation accurately, and further installed in the casing in advance. In addition, since the rust preventive tool can be sent out for drilling immediately after the end mill is retracted, the entire device can be made compact, and the work time until the rust preventive tool is attached to the device and attached to the drilling is shortened. can do.

The fluid pipe drilling rust prevention device of the present invention is
The rust preventive tool includes a rust preventive member that prevents rust by abutting over the perforations, and slits are formed on front and rear end surfaces in the feed direction of the rust preventive member.
According to this feature, slits are formed on the front and rear end surfaces of the rust preventive member in the feed direction, so that when the rust preventive tool is translated toward the perforations and the slits contact the end surfaces of the perforations, the slits are deformed. And guided to the upper surface of the perforation. Thereby, the lower surface of the rust preventive tool is brought into close contact with the upper surface of the perforation, so that the contact state between the perforated surface and the rust preventive tool can be reliably maintained, and the deterioration of the rust preventive effect can be prevented.

The fluid pipe drilling rust prevention device of the present invention is
A rust prevention tool presser for holding the rust prevention tool held in contact with the perforation in a state where the rust prevention tool is pushed and spread toward the perforation wall surface side is provided.
According to this feature, since the rust preventive tool is held in a state where the rust preventive tool is in contact with the perforation and is spread over the perforated wall surface, the tight contact between the perforated wall surface and the rust preventive tool can be reliably maintained, and the A decrease in the rust effect can be prevented.

The fluid pipe drilling rust prevention device of the present invention is
A work valve capable of closing the opening is integrally formed with the housing.
According to this feature, by operating the work valve integrated with the housing, the rust prevention device can be easily installed in an uninterrupted flow state, and a separate work attached outside from the opening. There is no need to install a valve. Further, when the perforation of the fluid pipe is reused or when the rust preventive tool is replaced, there is no need to install a separate work valve in the housing.

FIG. 3 is a front cross-sectional view illustrating drilling of a fluid pipe in Example 1. It is a top view which shows the state by which the housing | casing was attached to the fluid pipe | tube. It is front sectional drawing which shows the state by which the valve housing | casing was attached to the housing | casing. It is a sectional side view which shows the state in which the valve housing | casing was attached to the housing | casing. It is front sectional drawing which shows the state which obstruct | occluded the flow path of the fluid pipe | tube with the valve body. It is front sectional drawing which shows the state by which the outer cover was attached to the housing | casing. It is front sectional drawing which shows the state which mounted | wore the rust prevention tool in the piercing | piercing. It is a sectional side view which shows the state which mounted | wore perforation with the antirust tool. It is front sectional drawing which shows the state by which the antirust tool pressing tool was attached to the housing | casing in Example 2. FIG. It is a sectional side view which shows the state in which the antirust tool pressing tool was attached to the housing | casing. It is front sectional drawing which shows the state in which the rust preventive tool was pressed down with the rust preventive presser. It is a sectional side view which shows the state in which the rust preventive tool was pressed down with the rust preventive presser.

  EMBODIMENT OF THE INVENTION The form for implementing the fluid pipe | tube drilling rust prevention method and fluid pipe | tube drilling rust prevention apparatus which concern on this invention is demonstrated below based on an Example.

  A fluid pipe drilling rust prevention method and a fluid pipe drilling rust prevention apparatus according to an embodiment will be described with reference to FIGS. 1 to 9. As shown in FIG. 1, the fluid pipe 1 of the present embodiment is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and the inner peripheral surface is a mortar layer 1b. It is covered. The fluid pipe according to the present invention may be a metal pipe such as cast iron or steel. Furthermore, in the present embodiment, the fluid in the fluid pipe 1 is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, agricultural water, sewage, etc., gas or gas It may be a gas-liquid mixture of liquid and liquid.

  In this embodiment, as shown in FIGS. 2 to 4, a valve housing 13 having a valve body 14 is installed therein, and the flow path of the fluid in the fluid pipe 1 is blocked by operating the valve body 14. It is supposed to be. First, the installation of the valve housing 13 in the fluid pipe 1 will be described in the order of steps.

  First, the casing 2 is attached to the outer peripheral surface 1a of the fluid pipe 1 in a sealed manner. The housing 2 is a so-called split T-shaped tube, which is disposed from above with respect to the fluid pipe 1, and covers a first case 3 that covers the upper side of the outer periphery of the fluid pipe 1 and the fluid pipe 1 from below. The second case 4 is disposed and covers the lower side of the outer periphery of the fluid pipe 1. The first case 3 and the second case 4 are made of a metal material such as cast iron. Note that the housing may have a divided structure including three or more cases. Furthermore, as long as the material of the housing is applied according to the material of the fluid pipe to which the housing is attached, various materials may be used similarly to the fluid pipe described above.

  Among these, the first case 3 is configured to abut on the outer peripheral surface 1a of the fluid pipe 1 at a part of the inner wall, and at the substantially central portion of the fluid pipe 1 of the first case 3 in the tube axis direction, A branch port 3a is formed toward the head. The branch port 3a is formed in a non-circular shape in which the width dimension facing the radial direction of the fluid pipe 1 in plan view is longer than the width dimension facing the pipe axis direction of the fluid pipe 1. An opening flange portion 3b having a connection function with other members is formed at the upper end portion along the outer diameter of the branch port 3a. In the opening flange portion 3b, bolt screw holes 3d are formed at six positions at equal intervals along the circumferential direction of the opening flange portion 3b (see FIG. 2). The bolt screw hole may be provided in a desired quantity at a desired location, and can be set as appropriate.

  The first case 3 includes a work valve 8 that temporarily shuts off and opens the flow path of the branch port 3a, and a fluid pipe drilling rust preventive device 10 (hereinafter simply referred to as "rust preventive device 10") of the present invention described later. ) And are provided. The work valve 8 will be described in detail. The first case 3 has a work valve housing portion 3e that communicates with the outside of the first case 3 and the branch port 3a. A work lid 8g for sealing the outer opening end of the housing 3e in a sealing manner, and a work inserted into the work valve housing 3e through the work lid 8g in the radial direction of the branch port 3a. A shaft 8b, a work valve 8a extending from the work shaft 8b and blocking the flow path of the branch port 3a, and a shaft end 8c of the work shaft 8b exposed to the outside of the work valve housing 3e. The work handle 8f is connected to the shaft end 8c and moves the work valve element 8a via the work shaft 8b. In addition, annular rings 8d and 8d having a diameter larger than that of the branch port 3a are fitted along the respective annular grooves projectingly formed on the upper surface and the lower surface of the work valve body 8a. Further, the work lid 8g is provided with two sets of a pair of upper and lower protrusions 8h extending outward in the same direction as the work shaft 8b so as to surround the work shaft 8b. Bolt through holes penetrating in the vertical direction are respectively drilled in the end portions of the projecting portions 8h in the extending direction, and work valve bodies 8 to be described later are formed in the bolt through holes of the respective projecting portions 8h. The bolts and nuts 8j for preventing the slipping out are inserted, and a total of two bolts and nuts are tightened. The number of bolts and nuts 8j is not necessarily two, but may be one or three or more.

  Further, a pair of flanges 3 c and 3 c that face in the outer diameter direction of the fluid pipe 1 are formed so as to protrude from both ends on the circumferential side of the fluid pipe 1 in the first case 3. In addition, the seal | sticker which closely_contact | adheres to the outer peripheral surface 1a of the fluid pipe | tube 1 is arrange | positioned in the inner wall of the both ends in the pipe-axis direction of the fluid pipe | tube 1 of the 1st case 3 from the upper side. The member 3f is disposed over the entire length of the first case 3 in the circumferential direction. Similarly, on the inner peripheral surface of the first case 3, an O-ring 3g that is in close contact with the outer peripheral surface 1a of the fluid pipe 1 by arranging the first case 3 on the fluid pipe 1 from above is provided on the outer periphery of the branch port 3a. It is arrange | positioned so that it may surround along.

  On the other hand, the second case 4 is formed to have a dimension in the tube axis direction of the fluid pipe 1 that is substantially the same as that of the first case 3, and comes into contact with the outer peripheral surface 1 a of the fluid pipe 1 on the inner wall. Further, a pair of flanges 4 c and 4 c that face in the outer diameter direction of the fluid pipe 1 are formed so as to protrude from both end portions on the circumferential direction side of the fluid pipe 1 in the second case 4. Inside the flanges 4c and 4c, substantially the entire length of the fluid pipe 1 of the second case 4 extends over the entire length, and the inner walls at both ends in the tube axis direction of the fluid pipe 1 of the second case 4 are continuously attached to the second wall. Since the case 4 is disposed on the fluid pipe 1 from below, a seal member 4f that is in close contact with the outer peripheral surface 1a of the fluid pipe 1 is disposed.

  The first case 3 and the second case 4 configured as described above are configured such that the seal member 3f is formed between the outer peripheral surface 1a of the fluid pipe 1 and the first case 3 by tightening the flanges 3c and 4c with bolts and nuts. The inner wall and the seal member 4f are in close contact with the outer peripheral surface 1a of the fluid pipe 1 and the inner wall of the second case, respectively, and the seal member 4f is first inside the flanges 3c and 4c of the first case 3 and the second case 4. The first case 3 and the second case 4 are in close contact with each other over substantially the entire length of the fluid pipe 1 in the pipe axis direction. Furthermore, the casing 2 is attached to the fluid pipe 1 in a sealed manner by having both end portions on the circumferential direction side of the fluid pipe 1 of the seal member 3f in close contact with both ends on the circumferential side of the fluid pipe 1 of the seal member 4f. .

  A cutting device 9 as a drilling means in the present invention is disposed from above in the opening flange portion 3b of the casing 2 in the state shown in FIG. 2 attached to the fluid pipe 1 in a sealed manner. As shown in FIG. 1, a flange 9g formed in a non-circular shape so as to follow the shape of the opening flange 3b is formed at the lower end of the cutting device 9, and the flange 9g has an opening. An insertion hole (not shown) corresponding to the bolt screw hole 3d of the flange portion 3b is formed. The opening flange portion 3b and the flange portion 9g are tightened by screwing bolts 24 from the respective insertion holes toward the respective bolt screw holes 3d. An annular sealing material 9j is provided on the inner diameter side of the flange portion 9g with respect to each insertion hole, whereby the cutting device 9 is hermetically attached and fixed to the opening flange portion 3b.

  Further, the cutting device 9 will be described in detail. The cutting device 9 includes a cutting case 9d formed so as to penetrate in the vertical direction and provided with a flange portion 9g at the lower end, and horizontally in the transverse direction of the fluid pipe 1 at the upper end of the cutting case 9d. Rail 9e, a slide base 9f that can slide on the rail 9e while sealing the upper end of the cutting case 9d, and an upper end pivotally supported by the slide base 9f (not shown). And a shaft member 9a which is connected to a driving means (not shown) provided at the upper end of the slide base 9f and which advances in the axial direction from the cutting case 9d to the fluid pipe 1 in the branch port 3a, and the shaft member 9a An end mill 9b connected to the lower end portion, and a handling portion 9 capable of translating the shaft member 9a and the end mill 9b across the fluid pipe 1 by operating from the outside of the cutting device 9. And it is configured from. Of these, the end mill 9b is a perforated shaft having a cylindrical shape and provided with cutting blades on the bottom and side surfaces thereof, and is rotated around the shaft member 9a by the driving means. Can be cut.

  Further, a communication port 9h is formed through the cutting case 9d toward the outside. The communication valve 7 is connected to the communication port 9h in a sealed manner from the outside of the cutting case 9d. This communication valve 7 is provided with a valve body (not shown) that allows the inside and outside of the cutting case 9d to communicate with each other through the communication port 9h when the operator operates the lever 7a.

  The cutting device 9 configured in this way is configured to advance the end mill 9b toward the fluid pipe 1 in the axial direction of the shaft member 9a via the shaft member 9a, thereby cutting the cutting blade at the bottom of the end mill 9b in the housing 2. Thus, a part of the upper end portion of the fluid pipe 1 is cut. At the time of this cutting, by opening the valve body of the communication valve 7, chips generated during the cutting are discharged out of the housing 2.

  Then, after a predetermined amount of the upper end of the fluid pipe 1 is cut and penetrated by the cutting blade at the bottom of the end mill 9b, the operator rotates the handling part 9c, so that the slide base 9f is moved along the rail 9e to the fluid pipe. 1 is translated in the transverse direction. By the slide movement of the slide base 9f, the end mill 9b is maintained in the height position, and is moved in parallel so as to cross the fluid pipe 1 with the width of the branch port 3a as the limit. The tube 1 is cut. As described above, after the end mill 9b is advanced in the axial direction of the shaft member 9a toward the fluid pipe 1 through the shaft member 9a, the fluid pipe 1 is moved by the handling portion 9c while maintaining the height position of the end mill 9b. By parallel movement so as to cross, the perforation 1c is formed in the upper part of the fluid pipe 1 so that the width dimension in the pipe radial direction is longer than the width dimension in the pipe axis direction and penetrates in the circumferential direction of a substantially rectangular shape when viewed from above. Is drilled. The perforation surfaces of the perforations 1c drilled in this way are formed in the circumferential direction of the fluid pipe spanning the perforated upper surface 1d formed on both ends in the cutting direction by the end mill 9b and the perforated upper surface 1d. A substantially vertical perforated wall surface 1e.

  That is, the process described above includes the process of causing the end mill 9b provided at the tip of the shaft member 9a rotating about the axis to advance toward the fluid pipe 1 in the axial direction of the shaft member 9a, and the end mill 9b crossing the fluid pipe 1 A feed step of translating in the direction, and a step of forming a perforation 1c having a substantially rectangular shape in a top view in a part of the fluid pipe 1 through the feed step and penetrating in the circumferential direction. Since the fluid pipe 1 is simply translated in the transverse direction, the drilling operation can be easily performed and accurate dimensional accuracy of the drilling 1c can be obtained. Furthermore, since the part of the end mill 9b that cuts the fluid pipe 1 is displaced in the axial direction of the end mill 9b during translation, the load on the cutting blade of the end mill 9b is averaged, and the durability of the end mill 9b is improved.

  In this embodiment, the end mill 9b is advanced in the axial direction of the shaft member 9a toward the fluid pipe 1, and a part of the upper end of the fluid pipe 1 is cut through by the cutting blade at the bottom of the end mill 9b. However, the present invention is not limited to this, and the inner diameter of the branch port is set to be larger than the outer diameter of the end mill (not shown), and the end mill is moved from the outer side away from the fluid pipe. Perforations may be drilled only by translating in the transverse direction. In this way, since there is no process of penetrating with an end mill, man-hours can be reduced.

  After the perforation 1c is formed by the end mill 9b in this way, the shaft member 9a and the end mill 9b are retracted from the inside of the housing 2, and the work valve 8 is operated to temporarily seal the branch port 3a. The procedure for sealing the branch port 3a with the work valve 8 is as follows. The operator grips the work handle 8f connected to the shaft end 8c and pushes the work handle 8f in the inner diameter direction of the branch port 3a. Moves from the work valve housing 8e into the branch port 3a and eventually shuts off the flow path of the branch port 3a. In a state where the flow path of the branch port 3a is blocked by the work valve body 8a, the annular rings 8d and 8d abut against the tube wall constituting the branch port 3a, and the tube wall and the work valve body 8a are compressed. Is sealed off in a sealed manner. The work valve body 8a is tightened by inserting bolts / nuts 8j into the respective bolt through holes of the projecting portions 8h corresponding to each other in the vertical direction of the work lid 8g in a state where the flow path of the branch port 3a is blocked. To do. As a result, the work handle 8f is positioned in the gap between the work lid 8g and the bolt / nut 8j, that is, when the work handle 8f tries to move outward, the work handle 8f is locked to the bolt / nut 8j. The work shaft 8b and the work valve body 8a are prevented from coming off.

  Although not particularly shown, a brush as a cleaning means is attached to the shaft member 9a in place of the end mill 9b, the work valve 8 is operated to open the branch port 3a, and the shaft member 9a and the brush are directed to the perforation 1c. Advancing and moving the brush by the driving means and moving it in parallel in the radial direction of the fluid pipe 1 by operating the handling portion 9c, thereby removing impurities such as chips adhering to the cutting surface of the perforation 1c. To do.

  After removing the contaminants from the perforations 1c by the brush, the shaft member 9a and the brush are retracted from the inside of the housing 2, and the work valve 8 is operated to temporarily seal the branch port 3a. Then, the bolt 24 is once removed, the cutting device 9 is removed from the opening flange portion 3b, and a valve for previously blocking or opening the conduit of the fluid pipe 1 through the perforation 1c as shown in FIGS. The valve housing 13 in which the body 14 is disposed is installed in the opening flange portion 3b. An insertion hole 13j corresponding to the bolt screw hole 3d of the opening flange portion 3b is formed at the lower end of the valve housing 13, and a bolt 24 is screwed into each bolt screw hole 3d from the insertion hole 13j and tightened. At the same time, since an annular sealing ring 13h is interposed in the gap between the valve housing 13 and the opening flange portion 3b, it is connected in a sealed manner.

  The rotating screw 13d is rotatably attached to an insertion hole (not shown) formed in the top of the valve housing 13 so that the upper end protrudes outside the valve housing 13. The pressing plate 13e is fixed to the upper end surface of the valve housing 13 with a bolt, and prevents the rotation screw 13d from being pulled out from the insertion hole. With the above configuration, the rotating screw 13d is rotatable in both forward and reverse directions with respect to the valve housing 13, but does not move up and down. Reference numeral 13f denotes a screw portion having a circumferential surface screwed over substantially the entire length except for the upper end portion of the rotating screw 13d.

  The screw top 13g is fitted into a guide groove 14a formed at the upper end portion of the valve body 14, and is screwed into the screw portion 13f, and the rotation of the rotation operation portion 13b formed at the upper end portion of the rotary screw 13d. Accordingly, by rotating the screw portion 13f, the valve element 14 can move up and down following the screw top 13g screwed along the screw portion 13f. The valve body 14 is formed with an insertion hole 14b into which the screw portion 13f of the rotary screw 13d is inserted.

  Thereafter, as shown in FIG. 5, the valve body 14 moves downward by the rotation of the rotation operation unit 13 b by a handle (not shown), thereby elastically deforming the inner peripheral surface of the fluid pipe 1 and sealingly contacting the fluid pipe 1. The pipe of the fluid pipe 1 is opened by shutting off the pipe 1 and moving upward by the rotation of the rotation operation portion 13b by the handle. In addition, when the valve body 14 is elastically deformed so as to block the conduit of the fluid pipe 1, the valve body 14 comes into close contact with the cutting surface of the perforation 1 c to prevent the cutting of the fluid pipe 1 more reliably while preventing rust. Shut off the pipeline.

  As described above, in a state where the conduit of the fluid pipe 1 is blocked by the valve body 14, a predetermined operation such as replacement of the fluid pipe can be performed on the downstream side or the upstream side of the blocking portion. Then, after performing the predetermined work, the valve body 14 is retracted into the valve housing 13, the work valve 8 is operated to temporarily seal the branch port 3a, and the bolts are inserted from the insertion hole 13j and the bolt screw hole 3d. By removing 24 and removing the valve body 14 together with the valve housing 13 from the opening flange portion 3b, the operation of blocking the fluid flow path in the fluid pipe 1 by the valve body 14 is completed. And as shown in FIG. 6, the outer lid | cover 31 installed in the sealing form with respect to the opening flange part 3b is attached to the opening flange part 3b from which the valve housing | casing 13 was removed. As a result, it is possible to prevent foreign substances and the like from entering the branch port 3a.

  After completion of the operation of blocking the fluid flow path in the fluid pipe 1 as described above, the rust prevention device 10 is used to rust prevent the exposed top surface 1d and the perforated wall surface 1e of the perforated 1c. Rust prevention work is performed.

  First, the rust prevention device 10 will be described in detail with reference to FIG. 6. The rust prevention device 10 extends substantially horizontally from the end portion on the circumferential direction side of the first case 3 to the branch port 3 a, and both end portions thereof are The extending portion 10 a is opened, that is, the extending portion 10 a opens inward and outward of the housing 2 in the transverse direction of the fluid pipe 1. A lid 11 is attached to the extended portion 10 a in a sealed manner with a bolt or the like with respect to an opening facing the outside of the housing 2. A through hole 11c that penetrates from the outside in the axial direction of the branch port 3a is formed at the center of the lid 11, and annular seal rings 11f and 11f are formed on the inner peripheral surface of the through hole 11c. 11c is provided at two locations apart in the axial direction. A shaft portion 12a that can move forward and backward in the transverse direction of the fluid pipe 1 is inserted into the through hole 11c. Connected to the tip end of the shaft portion 12a is a flange portion 12b that extends vertically from the tip end of the shaft portion 12a and further extends in the transverse direction of the fluid pipe 1. Further, an installation handle 12c for moving the shaft portion 12a and the collar portion 12b is inserted into the rear end of the shaft portion 12a, and is drilled in the axial direction from the rear end surface of the shaft portion 12a. A bolt 12d is screwed into the screw hole and fixedly connected. Further, a rust preventive tool 15 attached to the perforation 1c is fixedly connected to the distal end portion of the flange portion 12b by a fixing bolt 15d. The lid 11 is provided with two sets of a pair of upper and lower projecting portions 11a extending outward in the same direction as the shaft portion 12a so as to surround the shaft portion 12a. Bolt through holes penetrating in the vertical direction are respectively drilled in the end portions of the projecting portions 11a in the extending direction, and the rust prevention tool 15 described later is formed in the bolt through holes of the projecting portions 11a of each set. The bolts and nuts 11b for preventing the slipping out are inserted and tightened in total (see FIGS. 6 and 7). The shaft portion 12a, the flange portion 12b, the installation handle 12c, the projecting portion 11a, and the bolt / nut 11b are arranged such that the rust preventive tool 15 is directed toward the perforation 1c in the same direction as the feeding process of the end mill 9b. The rust preventive tool insertion mechanism according to the present invention is configured such that the rust preventive tool insertion mechanism according to the present invention is configured to perform the parallel movement in the transverse direction and to send out and hold the piercing hole 1c in contact with the perforation 1c. The number of bolts and nuts 11b is not necessarily two, and may be one or three or more.

  Further, the rust preventive tool 15 will be described in detail. The rust preventive tool 15 has a shape along the drilled shape of the perforation 1c, and the arcuate base portion 15a that abuts the perforated wall surface 1e, and the rust preventive tool 15 becomes the perforated 1c. The rust preventive part 16 which is a rust preventive member of the present invention that comes into contact with the perforated upper surface 1d of the perforation 1c and the perforated wall surface 1e when the metal base of the metal pipe is exposed when mounted, and this embodiment The arcuate base portion 15a and the rust prevention portion 16 are made of elastic rubber, synthetic resin, or the like, and are integrally formed. Further, two grooves 15 b provided along the circumferential direction are arranged in parallel in the tube axis direction of the fluid pipe 1 on the outer peripheral surface of the arcuate base portion 15 a. The groove 15 b facilitates elastic deformation of the rust preventive tool 15 in the direction of the pipe axis of the fluid pipe 1. A communication hole that communicates in the longitudinal direction of the arcuate base portion 15a is provided at a substantially central portion at the top of the arcuate base portion 15a. The tip of the flange 12b is inserted into the communication hole, and the fixing bolt 15d is inserted from above. As a result, the rust preventive tool 15 is fixedly connected to the tip of the flange 12b. In addition, concave slits 16 a and 16 a that are open in the front-rear direction are formed on the front and rear end surfaces of the rust-preventing portion 16 in the feeding direction of the rust preventive tool 15. Further, in the present embodiment, three concave slits 16b are formed on both side end surfaces of the rust prevention portion 16 in the feeding direction of the rust prevention tool 15 in this embodiment. In the present embodiment, the arcuate base portion 15a and the rust prevention portion 16 have elasticity and are integrally formed with the rust prevention member of the present invention made of rubber, synthetic resin, etc. The arcuate base may be provided separately from the arcuate base by using a rigid member for the arcuate base, and an antirust member having elasticity for the anticorrosion part.

  Since these mechanisms for inserting the rust preventive tool 15 can be installed in the first case 3 of the nearby housing 2 where the perforations 1c are formed, the rust preventer 15 can be accurately inserted into the perforations 1c. Further, the rust preventive tool 15 can be sent out toward the perforation 1c immediately after the rust preventive tool 15 is installed in the extended portion 10a in advance and the end mill 9b is retracted. Therefore, it is possible to shorten the work time until the rust preventive tool 15 is attached to the apparatus and attached to the perforation 1c, and the entire rust preventive apparatus 10 can be made compact.

  The rust prevention work by the rust prevention apparatus 10 will be described. This rust prevention work is performed by translating the rust preventive tool 15 in the transverse direction of the fluid pipe 1 toward the perforation 1c in the same direction as the feeding process of the end mill 9b. And a step of holding the rust preventive tool 15 in contact with the perforation 1c.

  First, from the state of the rust preventive device 10 shown in FIG. 6, the operator grasps the installation handle 12c connected to the rear end of the shaft portion 12a and pushes it in the transverse direction of the fluid pipe 1, whereby the shaft portion 12a. And the collar part 12b moves to the cross direction of the fluid pipe | tube 1, and the rust prevention tool 15 comes to move in the housing | casing 2 from the extension part 10a with this movement. That is, the movement of the rust preventive tool 15 is a movement in the same direction as the cutting direction in which the perforation 1c is drilled, and the rust preventive tool 15 is moved parallel to the transverse direction of the fluid pipe 1 toward the perforation 1c. It has been sent out. Thus, by providing the installation handle 12c, the operator can directly grip the installation handle 12c from the outside of the lid 11 to operate the shaft portion 12a, and the rust preventive tool 15 can be moved. Easy.

  At this time, the rust preventive tool 15 is inserted into the perforation 1c from the end of the rust preventive tool 15. First, the bottom surface of the rust preventive tool 15 in the feeding direction is moved in sliding contact with the perforated upper surface 1d of the perforation 1c. Both side surfaces of the rusting tool 15 are gradually inserted while sliding on the perforated wall surface 1e, and the rustproofing tool 15 is attached to the perforating 1c before long. In a state where the rust preventive tool 15 is mounted on the perforation 1c, the lower surface of the front and rear ends of the rust preventive tool 15 and both side surfaces of the rust preventive tool 15 are the upper surface 1d of the perforation 1c and the perforated wall surface. It will be in the state contact | abutted without gap over 1e. Thus, when the rust preventive tool 15 is inserted into the perforation 1c, the initial insertion area of the rust preventive tool 15 with respect to the perforation 1c is reduced, so that the rust preventive tool 15 can be easily inserted. Further, since both side surfaces of the rust preventive tool 15 are gradually inserted while sliding on the perforated wall surface 1e of the perforation 1c, they are guided by the perforated wall surface 1e during the insertion of the rust preventive tool 15, so It is prevented from moving.

  Further, since slits 16a and 16a are formed on the front and rear end surfaces of the rust prevention portion 16 in the feeding direction of the rust prevention tool 15, the rust prevention tool 15 is moved in parallel toward the perforation 1c, and the slits 16a and 16a are provided. When the rust preventive portion 16 is brought into contact with the top surface 1d of the perforation 1c, the slits 16a and 16a are deformed so as to be in close contact with each other and are guided to the top surface 1d of the perforation. Thereby, the lower surface of the rust preventive tool 15 is brought into close contact with the perforated upper surface 1d, and the tight contact state between the perforated upper surface 1d and the perforated wall surface 1e and the rust preventive tool 15 can be reliably maintained, and the deterioration of the rust preventing effect can be prevented. . Furthermore, on each side end face of the rust prevention part 16 in the feeding direction of the rust prevention tool 15, three concave slits 16b that open upward are formed along the circumferential direction. When the rust preventive portion 16 provided with the slits 16b comes into contact with the two perforated wall surfaces 1e, the slits 16b are deformed so as to be in close contact with each other and are guided in the inner diameter direction of the perforated 1c. As a result, the rust preventive portion 16 is confined to the arcuate base portion 15a, the perforated upper surface 1d, and the perforated wall surface 1e, and the tight contact state between the perforated upper surface 1d, the perforated wall surface 1e and the rust preventive tool 15 can be reliably maintained, thereby preventing rust. A decrease in the effect can be prevented. The slit 16a and the slit 16b are not limited to the present embodiment, and a desired number of slits 16a and slits 16b may be formed, and can be appropriately set according to various aspects.

  In this manner, with the rust preventive tool 15 attached to the perforation 1c, the bolts / nuts 11b are inserted into the bolt through holes of the projecting portions 11a corresponding to each other in the vertical direction of the lid 11 and tightened. As a result, the installation handle 12c is positioned in the gap between the lid 11 and the bolt / nut 11b, that is, when the installation handle 12c tries to move outward, the installation handle 12c is locked to the bolt / nut 11b. The working shaft 8b and the working valve body 8a are prevented from coming off. That is, the rust preventive tool 15 is held in contact with the perforation 1c.

  As described above, in the fluid pipe drilling rust prevention method according to the present invention, the valve body 14 provided in the valve housing 13 that can block the flow in the fluid pipe 1 is installed in the fluid pipe 1 in an undisturbed state. For this purpose, the end mill 9b is a fluid pipe drilling rust prevention method for perforating 1c in the fluid pipe 1 and preventing the perforation 1c from being rusted. An end mill 9b provided at the tip of the shaft member 9a rotating around the axis is provided. A process of forming a perforation 1c penetrating in a circumferential direction having a substantially rectangular shape in top view in a part of the fluid pipe 1 through a feeding process of translating in the transverse direction of the fluid pipe 1, and a rust preventive tool 15 of the end mill 9b It has the process of translating in the transverse direction of the fluid pipe | tube 1 toward the perforation 1c in the same direction as a sending process, and sending out, and the process of hold | maintaining the antirust tool 15 in the state contact | abutted to the perforation 1c. According to this, since the end mill 9b is merely translated in the transverse direction of the fluid pipe 1, the drilling operation can be performed easily and accurate dimensional accuracy of the drill 1c can be obtained. Furthermore, since the part of the end mill 9b that cuts the fluid pipe 1 is displaced in the axial direction of the end mill 9b during translation, the load on the cutting blade of the end mill 9b is averaged, and the durability of the end mill 9b is improved. Further, since the mechanism for inserting the rust preventive tool 15 can be installed in the case 2 near the perforation 1c, the rust preventive tool 15 is easily brought into contact with the perforation 1c and easily held. Since the rust preventive tool 15 can be sent to the perforation 1c immediately after the rust preventive tool 15 is installed in advance and the end mill 9b is retracted, the rust preventive tool 15 is attached to the apparatus and attached to the perforated 1c. It is possible to shorten the work time until it is done.

  In addition, the fluid pipe drilling rust preventive device 10 according to the present invention is attached to the fluid pipe 1 by the casing 2 attached in a sealed manner to the fluid pipe 1 and the drilling means that advances through the opening flange portion 3b of the casing 2. A fluid pipe drilling rust preventive device 10 provided with a rust prevention tool 15 that is fitted into the drilled drilling 1c and prevents the drilling 1c from being rusted, and the drilling means includes a shaft member 9a that rotates about an axis. A piercing means for forming a perforation 1c penetrating in a circumferential direction having a substantially rectangular shape in top view in a part of the fluid pipe 1 by translating the end mill 9b provided at the tip in the transverse direction of the fluid pipe 1; 15 includes a rust preventive tool insertion mechanism that feeds 15 in the same direction as the feed process of the end mill 9b toward the perforation 1c while being translated in the transverse direction of the fluid pipe 1 and held in contact with the perforation 1c. According to this, since the end mill 9b is merely translated in the transverse direction of the fluid pipe 1, the drilling operation can be performed easily and accurate dimensional accuracy of the drill 1c can be obtained. Furthermore, since the part of the end mill 9b that cuts the fluid pipe 1 is displaced in the axial direction of the end mill 9b during translation, the load on the cutting blade of the end mill 9b is averaged, and the durability of the end mill 9b is improved. Further, since the mechanism for inserting the rust preventive tool 15 can be installed in the casing 2 near the drilling position, the rust preventive tool 15 can be easily held in contact with the drilling 1c accurately. Since the rust preventive tool 15 can be sent out toward the perforation 1c immediately after being installed in advance and the end mill 9b is retracted, the entire apparatus can be made compact, and the rust preventive tool 15 can be attached to the apparatus to the perforation 1c. Work time until installation can be shortened.

  In addition, a work valve 8 capable of closing the opening flange portion 3b is integrally formed with the housing 2. By operating the work valve 8 integrated with the housing 2, the cutting device 9 and the rust preventive are provided. The apparatus 10 and the like can be easily installed or removed in an uninterrupted state, and there is no need to attach a separate work valve attached above the branch port 3a. Further, when the perforation 1c of the fluid pipe 1 is reused or when the rust preventive tool 15 is replaced, it is not necessary to newly install a separate work valve in the housing.

  Next, a fluid pipe drilling rust prevention method and a fluid pipe drilling rust prevention apparatus according to Example 2 will be described with reference to FIGS. 9 to 12. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted.

  In FIG. 9, the antirust tool 15 has shown the aspect currently hold | maintained in the state contact | abutted to the perforation 1c. In this aspect, instead of the outer lid 31 (see FIG. 8) attached to the opening flange portion 3b of the housing 2, the rust preventive tool 15 held in contact with the rust preventive tool 15 is provided on the side of the piercing wall 1e of the piercing 1c. The rust preventive tool presser 20 that is held in the expanded state is attached.

  The rust preventive tool retainer 20 can be advanced and retracted toward the perforation 1c through the lid member 21 and the lid member 21 installed in a sealed manner with respect to the opening flange portion 3b of the housing 2 described above. And a presser member 25 that is connected to the tip of the installation member 22 and spreads the rust preventive tool 15 attached to the perforation 1c toward the perforation wall 1e side of the perforation 1c. Yes.

  The lid member 21 will be described. The lid member 21 has connection holes 21a corresponding to the bolt screw holes 3d of the opening flange portion 3b, and the surface of the lid member 21 on the opening flange portion 3b side has An annular seal member 18 formed with a diameter slightly larger than the outer diameter of the inner peripheral surface of the branch port 3a is provided. The bolt 24 is inserted into the bolt screw hole 3d and the connection hole 21a and tightened, whereby the opening flange portion 3b and the lid member 21 are hermetically connected via the seal member 18.

  A through hole 21c that penetrates from the outside in the axial direction of the branch port 3a is formed at the center of the lid member 21, and annular seal rings 21f and 21f are formed on the inner peripheral surface of the through hole 21c. Two through-holes 21c are spaced apart in the axial direction. Note that the seal ring is not limited to being provided at two locations apart in the extending direction of the through hole, but may be provided at one location or three or more locations, or provided substantially over the entire surface of the through hole. May be.

  Furthermore, four support screw holes are screwed on the upper surface of the lid member 21 so as to surround the periphery of the through hole 21c, and the lower end portion of the substantially cylindrical guide member 17 is provided for each of the support screw holes. Are respectively screwed. That is, four of these guide members 17 are erected upward from the upper surface of the lid member 21. In addition, this guide member is not restricted to standing on a cover member, For example, it may be externally fitted by the housing | casing and may be provided separately, and the number of guide members is not necessarily limited to four. It may be -3 or 5 or more.

  Similarly, on the upper surface of the lid member 21, holding screw holes 21e and 21e serving as holding positions for holding parts 22d described later are spaced apart from the through holes 21c in the radial direction of the hole 1c, and avoid each of the supporting screw holes. It is screwed at the position. A concave storage recess 21b that communicates with the inside of the housing 2 via the branch port 3a and can store a part of the pressing member 25 is formed on the lower surface of the lid member 21. Specifically, in the initial state where the rust preventive tool presser 20 is installed, the presser member 25 is stored in the space above the work valve body 8a in the branch port 3a and the storage recess 21b.

  Next, the installation member 22 will be described. The installation member 22 has an installation shaft 22a that is inserted into the through hole 21c and is disposed so as to be able to advance and retract toward the perforation 1c. The installation shaft 22a has a lower end portion. A convex portion 22b that protrudes in the traveling direction is formed, and a holding portion 22d that holds the position of the installation member 22 is formed at the upper end portion.

  The installation shaft 22a extends in the vertical direction, which is the same direction as each guide member 17, and the axial dimension is set corresponding to the dimension from the storage recess 21b to the perforation 1c through the branch port 3a. At the same time, it slides on the seal rings 21f and 21f of the through-hole 21c and moves forward toward the perforation 1c while keeping the seal. In this manner, the installation shaft 22a is separated in the extending direction of the through hole 21c and slides on the seal rings 21f and 21f provided at two locations, so that the installation member 22 can be prevented from tilting and guided in the insertion direction. In addition, the sealing performance can be improved. The convex portion 22b has a diameter smaller than that of the intermediate portion of the installation shaft 22a and protrudes in the axial direction. The convex portion 22b is formed in a rectangular shape when viewed in the axial direction, and a locking screw hole 22c is formed in the axial direction from the end surface. Has been.

  The holding portion 22d extends from the upper end portion of the installation shaft 22a toward the holding screw holes 21e and 21e, and holding portions respectively corresponding to the holding screw holes 21e and 21e are provided at both ends of the holding portion 22d. Holes 22f and 22f are formed. Furthermore, the holding portion 22 d extends in the outer diameter direction of the through hole 21 c and can be locked to the outer surface of the lid member 21. That is, it is prevented that the installation shaft 22a is excessively inserted when moving forward toward the perforation 1c.

  Furthermore, an operation screw hole 22e is formed through the holding portion 22d in the same direction as the tube axis direction of the fluid pipe 1, and outside the lid member 21 is provided on both sides of the operation screw hole 22e. The rod-like operation portions 19 and 19 capable of moving the installation member 22 from the side are screwed and connected. That is, the operation parts 19 and 19 are substantially linear and orthogonal to the extending direction of the holding part 22d, and the holding part 22d and the operation parts 19 and 19 have a substantially cross shape in plan view. Both end portions of the operation portions 19 and 19 and the holding portion 22d are disposed in the gaps between the adjacent guide members 17 and 17 on both sides, and the rotation of the installation member 22 around the axis of the installation shaft 22a is guided by each guide. It is installed in a state regulated by the member 17.

  Next, the presser member 25 will be described. The presser member 25 is fitted over each groove 15b of the rust preventive tool 15 and has a substantially U shape in a sectional view that opens downward. On the peripheral side surface, a projecting portion 25a is formed in an annular shape that projects outward from the lower end portion of the presser member about the depth of the groove 15b of the rust preventive tool 15 from above.

  A rectangular fitting hole (not shown) that fits the convex portion 22b of the installation member 22 is formed in the top portion of the pressing member 25 so as to penetrate in the vertical direction. The pressing member 25 can be detachably connected to the installation member 22 by fitting the projection 22b into the fitting hole (not shown) and screwing the locking screw 22j into the locking screw hole 22c. . Thereby, since the fitting hole of the convex portion 22 b and the pressing member 25 is formed in a rectangular shape, the rust preventive tool 15 can be positioned in the circumferential direction with respect to the installation member 22. In addition, the convex part and the said fitting hole which mutually fit should just be formed in the non-circular shape which can position a rust preventive tool in the circumferential direction.

  After the rust preventive tool presser 20 configured as described above is attached to the opening flange portion 3b in a sealed manner, the work valve 8 is operated to open the branch port 3a. Then, by pressing the operation portions 19 and 19 from above toward the perforation 1c, the installation member 22 moves forward while being restrained from being tilted or rotated by the respective guide members 17. Thus, by providing the operation parts 19 and 19, it becomes possible to directly hold the operation parts 19 and 19 from the outside of the lid member 21 and to operate the installation member 22, and to move the presser member 25. Easy. Further, since the installation member 22 can move along the guide member 17, the installation member 22 is prevented from being tilted or rotated, and the presser against the perforated hole 1c formed in the curved surface shape. The installation member 22 can be sent out without causing a positional shift of the member 25.

  As the installation member 22 moves forward, the presser member 25 also moves, and eventually the presser member 25 is fitted into each groove 15b of the rust preventive tool 15. At this time, as the presser member 25 is fitted into each groove 15b of the rust preventive tool 15, the rust preventive portion 16 is elastically deformed and expanded, and comes into contact with the perforated wall surface 1e of the perforated 1c, The perforation wall surface 1e of the perforation 1c is covered. Furthermore, the rust preventive portion 16 is narrowly pressed into the gap between the perforated upper surface 1d and the perforated wall surface 1e by the overhang portion 25a.

  As described above, since the dimension of the installation shaft 22a in the installation member 22 in the axial direction is set corresponding to the movement dimension from the storage recess 21b of the presser member 25 to the perforation 1c, the presser member 25 is fitted into the perforation 1c. In the worn state, the holding portion 22 d is in contact with the outer surface of the lid member 21.

  Then, the holding screw holes 21e and 21e of the lid member 21 and the holding holes 22f and 22f of the holding portion 22d are aligned, and the holding bolt 22g is screwed into each. As a result, the pressing member 25 is fitted in each groove 15b of the rust preventive tool 15, and the contact portion of the rust preventive portion 16 with the perforated upper surface 1d and the perforated wall surface 1e is elastically deformed and further expanded. Retained.

  In this way, in addition to the step of holding the rust preventive tool 15 in contact with the perforations 1c, the step of holding the rust preventive tool 15 in contact with the perforations 1c in a state where the rust preventive tool 15 is spread to the wall surface side of the perforations 1c. Thus, in order to hold the rust preventive tool 15 in a state in which the rust preventive tool 15 is in contact with the perforation 1c, the rust preventive tool 15 is pushed and spread on the perforated upper surface 1d and the perforated wall surface 1e of the perforated 1c. 1e and the rust preventive tool 15 can be securely kept in close contact with each other, and the deterioration of the rust preventive effect can be prevented.

  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 above-described embodiment, the rust preventive tool 15 includes the arcuate base portion 15a having substantially the same shape as the cutting portion in which the perforation 1c is drilled in the pipe wall of the fluid pipe 1, but the invention is not limited thereto. One or more holes communicating with the branch port may be provided in the arc-shaped base portion, or the arc-shaped base portion may be formed in an annular shape, and the central portion of the arc-shaped base portion may be communicated with the branch port.

  In the above-described embodiment, the valve body 14 has been described as a switching valve that opens the conduit of the fluid pipe 1. However, the valve body 14 is not limited thereto, and may be a butterfly valve, a gate valve, a plug, an emergency shut-off valve, or the like.

  Moreover, in the said Example, the working shaft 8b, the shaft part 12a, and the installation shaft 22a of each of the work valve 8, the rust prevention device 10, and the rust prevention tool presser 20 are moved forward by being pressed from the outside. However, the present invention is not limited to this, and may be gradually advanced by screwing and rotating.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 1c Perforation 1d Perforation upper surface 1e Perforation wall surface 2 Case 8 Work valve 9 Cutting device (drilling means)
9a Shaft member 9b End mill 10 Fluid pipe drilling rust prevention device 11a Projecting part (rust prevention tool insertion mechanism)
11b Bolt / Nut (rust prevention tool insertion mechanism)
12a Shaft (rust prevention tool insertion mechanism)
12b buttock (rust prevention tool insertion mechanism)
12c Installation handle (rust prevention tool insertion mechanism)
13 Valve housing 14 Valve body 15 Rust prevention tool 15a Arc-shaped base 16 Rust prevention part (rust prevention member)
16a Slit 16b Slit 20 Rust prevention tool presser 22 Installation member 22a Installation shaft 25 Presser member

Claims (6)

In order to install the valve body provided inside the valve housing capable of closing the flow in the fluid pipe in the fluid pipe in an uninterrupted flow state, the fluid pipe is perforated in the fluid pipe by an end mill, and the perforation is prevented from rusting. A drilling rust prevention method,
Through a feed step of translating an end mill provided at the tip of a shaft member rotating around the axis in the transverse direction of the fluid pipe, a perforation penetrating in a circumferential direction having a substantially rectangular shape in top view is formed in a part of the fluid pipe. Holding the rust preventive tool in contact with the perforation, and a step of translating the rust preventive tool in the same direction as the end mill feeding process in the transverse direction of the fluid pipe toward the perforation. A fluid pipe drilling rust prevention method comprising the step of:   In addition to the step of holding the rust preventive tool in contact with the perforations, the method further comprises the step of holding the rust preventive tool in contact with the perforations in a state where the rust preventive tool is pushed and spread toward the perforated wall surface. The fluid pipe drilling rust prevention method according to claim 1. A housing that is attached to the fluid pipe in a sealed manner, and a rust preventive tool that is fitted into a perforation drilled in the fluid pipe by a drilling means that proceeds through an opening of the housing and prevents the perforation. A fluid pipe drilling rust prevention device comprising:
The drilling means translates an end mill provided at the tip of a shaft member rotating around an axis in the transverse direction of the fluid pipe, thereby penetrating a part of the fluid pipe in a circumferential direction having a substantially rectangular shape when viewed from above. The drilling means to be formed;
A rust preventive tool insertion mechanism that holds the rust preventive tool in a state of being parallel to the perforation in the same direction as the end mill feed process and moving in parallel with the transverse direction of the fluid pipe, and holding the rust preventive tool in contact with the perforation.
A fluid pipe drilling rust prevention device characterized by comprising:   The rust preventive tool includes a rust preventive member that prevents rust by abutting over the perforations, and slits are formed on front and rear end surfaces in the feed direction of the rust preventive member. 3. The fluid pipe drilling rust preventive device according to 3.   5. The rust preventive tool presser for holding the rust preventive tool held in contact with the perforations in a state where the rust preventive tool is pushed and spread toward the perforated wall surface side. 6. Fluid pipe drilling rust prevention device.   The fluid pipe drilling rust preventive device according to any one of claims 3 to 5, wherein a work valve capable of closing the opening is integrally formed with the casing.

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